HVACR Technology and Infrastructure Solutions | Emerson US · 15 iia safety setpoint functions 19 iib control limit setpoint functions 27 iic setpoint timer functions 35 iid operator

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BULLETIN VRS MICROPART #35391UPRICE $20.00

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VILTER MANUFACTURING CORPORATION

TWIN SCREW COMPRESSOR MICROPROCESSORINSTRUCTION MANUAL

TABLE OF CONTENTS

PAGE SECTION

11 I INSTALLATION

13 II PREPARATION FOR START-UP15 IIA SAFETY SETPOINT FUNCTIONS19 IIB CONTROL LIMIT SETPOINT FUNCTIONS27 IIC SETPOINT TIMER FUNCTIONS35 IID OPERATOR OPTIONS39 IIE RECALIBRATE TRANSDUCERS43 IIF DIGITAL PORT STATUS43 IIG FORCE OUTPUTS ON44 IIH SET TIME AND DATE

45 III SEQUENCE OF OPERATION

57 IV REMOTE CONTROL OPTIONS

61 V TROUBLESHOOTING GUIDE

65 VI SPARE PARTS LIST

LIST OF ILLUSTRATIONS

PAGE FIGURE

1 1 DISPLAY MENUS2 1A ADDITIONAL DISPLAY MENUS2 2 SAFETY SETPOINT MENUS3 3 CONTROL LIMIT SETPOINTS4 4 SYSTEM TIMER MENUS5 5 OPERATOR OPTIONS MENUS7 6 SYSTEMS SETPOINTS, ALARMS, AND TRIPS

WORKSHEETS8 7 SYSTEM CONTROL VALUES WORKSHEET9 8 SYSTEM TIMER SETPOINTS37 9 NETWORK ADDRESS MODE JUMPER LOCATIONS- - EPROM REPLACEMENT PROCEDURE- - MICROPROCESSOR OPERATING MODE MESSAGES AND

THEIR MEANING- - PERFORMING A “COLD START” PROCEDURE ON

MICROPROCESSOR- - T-SHEET T00397- - T-SHEET T00404- - T-SHEET T00405- - T-SHEET T00406- - T-SHEET T45031-1/2 & 2/2

7-95VRSMICRO -A- REPLACES 6-93

FIG. 1 DISPLAY MENUS

LIST CURRENT VALUES CHANGE/DISPLAY SETPOINTS MISC SCREENSSUCT DSCH OIL MNFLD FLTR %CAP AMPSSP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: ************* : ******************

SAFETY SETPOINTS (SETPT *)Safety Description ALRM TRIP RESET ***# ***# ***# (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desired Option # * : option. (y) ( ) indicates the ( ) option isactive.

(MODE=COMPRESSOR OPERATING MODE)

PRESSURES DIFFERENTIALS FILTER IN ***# MANIFOLD ***# FILTER OUT ***# DISCHARGE ***# FLTR DIFF ***# OIL DIFF ***#

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT ***# ***# (Move between fields with “NEXT” key)

MISC1 - RESERVED

*** ACTIVE ALARMS AND TRIPS ***

Alarm: Trip:

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value *** *** (Move between fields with “NEXT” key.)

RESET TO CLEAR VALUE Channel # = ****mV *** Channel =

EVENT LIST PG ** CURRENT TIMER VALUES (SEC,MIN,COUNTS) Timer Field Current ****** Compressor Runtime (Hrs:Min): ****:**

DIGITAL PORT STATUS Reference YOURLOCATION: 0 1 2 3 4 5 6 7 wiring diagramPort #1: * * * * * * * * for port I/OPort #2: * * * * * * * * descriptions.

HISTORY VALUES Enter Password. Enter Interval = *** the time interval and Unit = *** then select the unit of “SEC, MIN or HRS”.

SPG2 RESERVED FORCE OUTPUTS ON Use key to force Port # ** selected output on.Output # ** : *** Comp relay output is monitored & limited.

*** *** NEW OLD NEW OLDSUCT PR *** *** *** FLT IN *** *** ***DSCH PR *** *** *** FLT OUT *** *** ***OIL PR *** *** *** FLTR PR *** *** ***

PRINT *************** Select interval. Interval = *** *** Set Level = 0. Baud = ***** Level * Printout on time (8,1,No Parity) Cnt=0 or BLANK key.

SET DATE AND TIME Set time in militaryDate: **/ **/ ** format. All eventsTime: **: **: ** are timestamped fromDay of Week: *** this clock setting.

*** *** NEW OLD NEW OLDSUCT °F *** *** *** CAP% *** *** ***OIL °F *** *** *** AMPS *** *** ***DSCH °F *** *** ***

SPG5 MISC4

LPG5 LEAD/LAG VALUE SCREENREC CPUTERHD ***% CURRENT %CAPACITY***%LAD CAPHOLD ***% SENT CAPHOLD VALU***%CAPSTEP ***%

VILTER MANUFACTURING CORPORATION 5555 SOUTH PACKARD AVENUE CUDAHY, WI 53110 VRS 4.xxARSW-*** NODE # ***

7-95VRSMICRO -1- REPLACES 6-93

FIG. 1A ADDITIONAL DISPLAY MENUSLIST CURRENT VALUES

SUCT DSCH OIL PROCESS & SBX TEMPS SP***# ***# ***# PROC SBX1 SBX2 SBX3***° ***° ***° ***° ***° ***° ***°Mode: ************* : ******************

(MODE = COMPRESSOR OPERATING MODE)To display, press BLANK key next to STOP button.

FIG. 2 SAFETY SETPOINT MENUS

Please refer to the page number below each screen for anexplanation of the screen.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET LO SUCTION TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET LO OIL INJECT TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET LO RUN OIL PRESSURE ***# ***# ***# (Move between fields with “NEXT” key.)

Please see page 15 Please see page 16 Please see page 17 SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET HI DISCHARGE TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET HI OIL INJECT TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET HI START FLTR DIFF PR ***# ***# ***# (Move between fields with “NEXT” key.)

Please see page 15 Please see page 16 Please see page 18 SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET LO PROCESS CTRL TEMP ***° ***°***° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET LO SUCTION PRESSURE ***# ***#***# (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET HI RUN FLTR DIFF PR ***# ***# ***# (Move between fields with “NEXT” key.)

Please see page 15 Please see page 17 * Please see page 18 SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESET HI PROCESS CTRL TEMP ***° ---° ---° (Move between fields with “NEXT” key.)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI DISCHARGE PRESSURE ***# ***#***# (Move between fields with “NEXT” key.)

Please see page 16 Please see page 17 *

NOTES: * Indicates Dual Setpoint Parameter.


FIG. 3 CONTROL LIMIT SETPOINT MENUS


CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT SUCTION PRESS ON/OFF ***# ***# (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT CAP CONTROL °F INCR ***°F ***°F (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT LEAD,MAXIMUM CAP LAG ***% ***% (Move between fields with “NEXT” key.)

Please see page 19 * Please see page 21 * Please see page 24 CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT SUCT PR CAP INCREASE ***# ***# (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT CAP CONTROL °F DECR ***°F ***°F (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT ECONOMIZER SOLENOID ***% ***% (Move between fields with “NEXT” key.)

Please see page 19 * Please see page 22 * Please see page 24 CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT SUCT PR CAP DECREASE ***# ***# (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT LAG,CAPACITY STEP ***% --- (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUTMOTOR AMP LOAD LIMIT ***A ***A (Move between fields with “NEXT” key.)

Please see page 20 * Please see page 22 Please see page 25 CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT HI DSCH PR LOAD LIMIT ***# ***# (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT MINIMUM RUN CAPACITY ***% --- (Move between fields with “NEXT” key.)

CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT CURRENT TRANSFORMER **** /5AMPS (Move between fields with “NEXT” key.)

Please see page 20 * Please see page 23 Please see page 25 CONTROL LIMITS (SETPT *)Control Description CUTINCUTOUT CAP CTRL °F ON/OFF ***°F ***°F (Move between fields with “NEXT” key.)

Please see page 21 *

NOTE: * Indicates Dual Setpoint Parameter.


FIG. 4 SYSTEM TIMER DISPLAY


TIMER SETPOINTS (SEC,MIN,COUNTS) Tuner FieldValueCAPACITY INCREASE SOLENOID ON***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueOIL PRESS BYPASS ALLOW TIMER ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCAP HOLD SOLENOID ON TIME ***SEC (Move between fields with “NEXT” key.)

Please see page 27 Please see page 29 Please see page 32 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCAPACITY INCREASE SOLENOID OFF***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValue OIL PRESS FAIL DELAY TIMER ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueANTIRECYCLE START TIMER (MIN) ***MIN (Move between fields with “NEXT” key.)

Please see page 27 Please see page 29 Please see page 32 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCAPACITY DECREASE SOLENOID ON***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValue LO OIL INJECTION TEMP BYPASS *** SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValue START LAG COMP TIMER (MIN) ***MIN (Move between fields with “NEXT” key.)

Please see page 27 Please see page 30 Please see page 33 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCAPACITY DECREASE SOLENOID OFF ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueFILTER DIFF PRESS CHANGE-OVER ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueSTOP LAG COMP TIMER (MIN) ***MIN (Move between fields with “NEXT” key.)

Please see page 28 Please see page 30 Please see page 33 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueSLIDE VALVE RETURN AT SHUTDO ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValuePUMP RUN LIMIT W/O OIL PRESS ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueFORCE START LAG COMP (MIN) ***MIN (Move between fields with “NEXT” key.)

Please see page 28 Please see page 30 Please see page 34 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCMP STARTER AUX CONTACT BYPASS***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueAUTO RESTART AFTER POWER FAIL ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueHOT STARTS/HR COUNTER ***CTS (Move between fields with “NEXT” key.)

Please see page 28 Please see page 31 Please see page 34 TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueOIL PUMP PRELUB BEFORE START ***SEC (Move between fields with “NEXT” key.)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer FieldValueCAP HOLD SOLENOID OFF TIME ***SEC (Move between fields with “NEXT” key.)

Please see page 29 Please see page 31


FIG. 5 OPERATOR OPTIONS MENU

Please refer to Section IID for detailed descriptions of each operator option.

OPERATOR OPTIONS MENU Select desiredOption # 1: option. (y)HOT STARTS/HR (y) indicates the ( )ANTIRECYCLE TMR option is active.

OPERATOR OPTIONS MENU Select desiredOption # 3: option. ( )TEMP CTRL ACTIVE (y) indicatesthe (y)PRESS CTRL ACTIVE option isactive.

OPERATOR OPTIONS MENU Select desiredOption # 5: option. ( )MIN RUN CAP ENABLE (y) indicates the (y)MIN RUN CAP OFF option is active.

OPERATOR OPTIONS MENU Select desiredOption # 2: option. ( )POWER-UP AUTO STRT (y) indicates the (y)POWER-UP MAN STRT option is active.

OPERATOR OPTIONS MENU Select desiredOption # 4: option. (y) ( )LEAD/LAG ENABLE indicates the (y)LEAD/LAG DISABLE option is active.



The values or options in the screen displays shown must be entered before start-up. Refer to the“Preparation for Start-Up” Section for instructions.

FIG. 6 - SYSTEM SAFETY SETPOINTS ALARMS & TRIPS WORKSHEET

SYSTEM VALUES VALUE LIMITS DEFAULT VALUESSAFETY SETPOINTS ALARM TRIP RESET ALARM TRIP RESET ALARM TRIP RESET

LO SUCT TEMP -99/400° -99/400° -99/400° -95° -99° -90°

HI DISCHARGE TEMP + -30/220° -30/220° -30/220° 200° 210° 190°

LO PROCESS CTRL TEMP * -99/400° -99/400° -99/400° -50° -55° -45°

HI PROCESS CTRL TEMP * -99/400° - - - - - - 100° - -° -

LO OIL INJECT TEMP 80/210° 80/210° 80/210° 90° 90° 95°

HI OIL INJECT TEMP -99/210° -99/210° -99/210° 140° 145° 140°

LO SUCTION PRESSURE *SETPOINT #1 30”/300 30”/300 30”/300 8” 10” 6”SETPOINT #2 30”/300 30”/300 30”/300 4 2 4

HI DISCHARGE PRESSURE **SETPOINT #1 30”/300 30”/300 30”/300 210 220 205SETPOINT #2 30”/300 30”/300 30”/300 220 230 215

LO RUN OIL PRESSURE # 15/300 15/300 15/300 25 18 20

HI START FLTR DIFF PR - - - -99/50 -99/50 - - 40 25

HI RUN FLTR DIFF PR -99/30 -99/30 -99/30 12 15 10

NOTES: * Set only if temperature control is used for capacity control.** Must be field set.# Must be reset for Booster applications.+ Set trip approximately 20°F above normal operating temperature at 100% capacity.



FIG. 7 - SYSTEM CONTROL LIMIT VALUES WORKSHEET

SYSTEM VALUES VALUE LIMITS DEFAULT VALUESCONTROL LIMITS CUT IN CUT OUT CUT IN CUT OUT CUT IN CUT OUT

SUCTION PRESS ON/OFF **SETPOINT #1 30”/150 30”/150 10 6SETPOINT #2 30”/150 30”/150 15 11

SUCT PR CAP INCREASE **SETPOINT #1 30”/150 30”/150 20 20SETPOINT #2 30”/150 30”/150 25 25

SUCT PR CAP DECREASE **SETPOINT #1 30”/150 30”/150 18 18SETPOINT #2 30”/150 30”/150 23 23

HI DSCH PR LOAD LIMITSETPOINT #1 0/250 0/250 200 190SETPOINT #2 0/250 0/250 210 200

CAP CONTROL °F ON/OFF *SETPOINT #1 -99/200° -99/200° 20° 10°SETPOINT #2 -00/200° -99/200° 25° 15°

CAP CONTROL °F INCRSETPOINT #1 -99/200° -99/200° 28° 27°SETPOINT #2 -99/200° -99/200° 33° 32°

CAP CONTROL °F DECR *SETPOINT #1 -99/200° -99/200° 24° 25°SETPOINT #2 -99/200° -99/200° 29° 30°

MINIMUM RUN CAPACITY ** 10/100 - - 30 - -VALUE VALUE VALUE

LAG,CAPACITY STEP ## 0/100 - - 10 - -

LEAD,MAXIMUM CAP FLAG ## 50/100 50/100 95 90

ECONOMIZER SOLENOID 0/100 0/100 80 75FLA MAX FLA MAX FLA MAX

MOTOR AMPS LOAD LIMIT ** 0/999 0/999 5 10C/T RATIO C/T RATIO C/T RATIO

CURRENT TRANSFORMER ** (100/2000)/5AMPS 100/5AMPS

NOTES: * Set only if temperature control is used for capacity control.** Must be field set.## Set only if lead/lag option is selected.



FIG. 8 - SYSTEM TIMER VALUES WORKSHEET

TIMER VALUES SYSTEM VALUES VALUE LIMITS DEFAULT VALUES

CAPACITY INCREASE SOLENOID ON 0/255 SEC 5 SEC

CAPACITY INCREASE SOLENOID OFF 0/255 SEC 10 SEC

CAPACITY DECREASE SOLENOID ON 0/255 SEC 10 SEC

CAPACITY DECREASE SOLENOID OFF 0/255 SEC 10 SEC

SLIDE VALVE RETURN AT SHUTDOWN 0/255 SEC 180 SEC

CMP STARTER AUX CONTACT BYPASS 0/255 SEC 10 SEC

OIL PUMP PRELUB BEFORE START 0/45 SEC 15 SEC

OIL PRESS BYPASS ALLOW TIMER 0/300 SEC 300 SEC

OIL PRESS FAIL DELAY TIMER 0/20 SEC 10 SEC

LO OIL INJECT TEMP BYPASS 0/600 SEC 300 SEC

FILTER DIFF PRESS CHANGE-OVER 0/300 SEC 60 SEC

PUMP RUN LIMIT W/O OIL PRESS 0/300 SEC 60 SEC

CAP HOLD SOLENOID OFF TIME 0/255 SEC 9 SEC

CAP HOLD SOLENOID ON TIME 0/255 SEC 1 SEC

AUTO RESTART AFTER POWER FAIL 1/240 MIN 1 MIN

ANTIRECYCLE STRT TIMER (MIN) ** 6/30 MIN 20 MIN

START LAG COMP TIMER (MIN) ## 0/30 MIN 5 MIN

STOP LAG COMP TIMER (MIN) ## 0/30 MIN 5 MIN

FORCE START LAG COMP (MIN) ## 0/60 MIN 30 MIN

HOT STARTS/HR COUNTER (COUNTS) ** 1/10 CTS 3 CTS

NOTES: ** Must be field set.## Set only if lead/lag option is selected.



I. INSTALLATION & GENERAL DESCRIPTION

Please refer to the wiring diagram supplied with the unit for the necessary information onwiring the unit.

UNITS WITH FACTORY-EQUIPPED MICRO

The unit is pre-wired at the factory. The necessary field wiring is described below.

1. The control power for the unit is 115 VAC, 50/60 HZ. The incoming power must bewired to the control fuses. L1 is brought to the fuse terminals as designated on theunit wiring diagram. L2 is brought into the terminals as designated in the unit wiringdiagram, the terminal strip located in the bottom of the panel. For units with V-PLUS® cooling, consult the appropriate wiring diagram for the V-PLUS panel, L1must also be brought to the fuse in the V-PLUS panel, and L2 must also be broughtto other control power terminal in the V-PLUS panel.

2. An auxiliary contact from the compressor motor starter is required. This isolatedcontact is connected to appropriate terminals on the terminal strip.

3. A dry contact from control relay CR-3 must be wired to the compressor motorstarter coil. This dry contact is connected to the terminal strip. Control power forthis coil should come from a source that is de-energized with the compressordisconnect.

4. A dry contact from control relay CR-2 must be wired to the oil pump motor startercoil. This dry contact is connected to the terminal strip. Control power for this coilshould come from a source which is de-energized with the compressor disconnect.

5. Two auxiliary safety cutouts are available to shut down the compressor package. Adry contact must be supplied and wired to the appropriate terminals for auxiliary #1on the terminal strip and auxiliary #2 on the SBX board terminal strip. The jumperon the terminal strip between these terminals must be removed to use thesecutouts. These contacts, if closed, will allow the compressor to run. If thesecontacts open at any time, the compressor will shut down. NOTE: Versions 2.XXand lower have only Aux. #1 available.

6. External indication of the compressor alarm or shutdown status is also available.To monitor the alarm status, the terminal will have a 115 VAC potential when thecompressor is operating normally, and drop to 0 VAC when in an alarm condition.To monitor the shutdown status, the terminal will have a 115 VAC potential whenthe compressor is operating normally, and drop to 0 VAC when in a shutdowncondition.


I. INSTALLATION & GENERAL DESCRIPTION (cont’d)

7. The current transformer is supplied in the compressor motor conduit box andshould be checked to insure that the motor leads of one leg are pulled through thetransformer. Typically, a wye delta started motor should have leads 1 and 6 pulledthrough this transformer for a 6 lead motor. However, this should always bechecked as different motors and starting methods will require different leads to beused.


II. PREPARATION FOR START UP

After installation wiring is complete, the following steps, where indicated, must be taken toensure satisfactory operation and protection. The values that are blank in Fig. 6, 7 & 8 arenecessary to enter for your specific application. Specific instruction for each of the screendisplays along with the display are listed in the following instructions.

In order to carry out the specific steps listed below, please refer to Fig. 1. Fig. 1 shows thearrangement of the various screen displays. Movement from one screen display toanother is accomplished with the 4 arrow keys. For example, to move from the firstCurrent Values screen display (located in column 1, row 1, of Fig. 1) to the OperatorOptions screen display (located in column 3, row 1), do the following:

1. Push the RIGHT ARROW key 2 times. You are now in one of the menus listed incolumn 3.

2. Pushing the UP ARROW key will get you to Row 1 if the Operator Options Menu isnot displayed immediately.

By referring to Fig. 1, changing screen displays is simple and fast. The Controlremembers the last row number for a particular column. This allows toggling betweenmenus in different columns and rows quickly.

To change any Setpoint, Time Delay, Time Interval, Operator Option, Calibration, ControlLimit, or Event List, the password must be entered. The PASSWORD for your unit isEDIT, NEXT, NEXT, ENTER.

1. Upon initial energization, the screen will indicate a trip on aux. #2 input. This is aninternal safety relay in the program that requires resetting after a power-up. Pushthe reset button as screen instructs. Movement between screen displays can nowbe accomplished; whereas, without a reset, the unit remains on the ActiveAlarm/Trip screen display.

2. Push the EXIT key. This always returns to the Current Values screen display (Row1, Column 1).

3. Calibration of the pressure and temperature transducers is done at the factory andshould not have to be repeated. If recalibration is necessary, refer to the SectionIIE Recalibrate Transducers for further information.

4. Safety Setpoints for the specific application must be entered. Using the ARROWkeys, go to the Change/Display Setpoints screen display (column 2, row 1). All thesafeties can be selected from this screen display.


II. PREPARATION FOR START UP (cont’d)

Enter the password. An arrow should appear, just to the left of the safetyparameter. To change a safety parameter (listed in figures 6, 7 & 8), press ENTER(an asterisk should replace arrow). Then, with the UP & DOWN ARROW keys,select the safety parameter that is required.

When the required safety parameter is displayed, lock it in by pressing ENTER.The cursor will return. To change a safety setpoint, press the NEXT key. Thearrow will move to the alarm setpoint value. To change this value, press ENTER(an asterisk will replace the arrow). Again, with the UP & DOWN ARROW keys,adjust the value up & down as required. Lock it in by pressing ENTER.

Adjust the next parameter. Select Trip by pressing the NEXT key twice. To enterthe edit mode, press ENTER again. This changes the arrow to an asterisk. Set tothe required value. Continue through this entire screen, setting each Safety SetPoint as listed in Figure 6. When done, return to home or current values (Column1, Row 1) screen by pressing EXIT key.

NOTE:When returning to a column, the display automatically returns to the row that it was last in.

When an operating value exceeds the alarm setting of the safety setpoint, an alarm will beactive on the Alarm/Trip display (Column 1, Row 3). If the operating value then exceedsthe trip setting of the safety setpoint, the compressor will shut down. The display will thenbe forced to the Active Alarm trip display (Column 1, Row 3). In order to move from thisdisplay, the trip must be acknowledged with a reset. The compressor will not restart untilthe operating value that caused the trip is within the reset range and the failure is thenacknowledged by a reset.

When Dual Setpoint operation is desired, the Setpoint selection can be accomplished by aselector switch (not provided by Vilter) which is wired to Port 2 Module 0. If power isapplied to the module, then the System Safety Setpoint and Control Limit Values forSetpoint #2 are active. When the power is removed from the Module, then the SystemSafety Setpoint and Control Limit Values for Setpoint #1 are active.


IIA. SAFETY SETPOINT FUNCTIONS

The following is a list of the safety menus (Column 2, Row 1), with a brief description ofeach. When the alarm setpoint is exceeded, an alarm will be indicated. If the trip value isexceeded, the compressor will shutdown or be prevented from starting and a failure will beindicated. The compressor may be restarted once the system value is within the resetvalue and the reset button is pressed.

When Dual Setpoint operation is desired, the Setpoint selection can be accomplished by aselector switch (not provided by Vilter) which is wired to Port 2 Module 0. If power isapplied to the module, then the System Safety Setpoint Values for Setpoint #2 are active.When the power is removed from the Module, then the System Safety Setpoint Values forSetpoint #1 are active.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETLO SUCTION TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

Lo Suction Temperature - This is the low suction temperature safety. The alarm or trip willbe active if the suction temperature should drop below the respective setpointvalues.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI DISCHARGE TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

Hi Discharge Temperature - This is the high discharge temperature safety. The alarm ortrip will be active if the discharge temperature should rise above the respectivesetpoint values.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETLO PROCESS CTRL TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 3: option. (y)TEMP CTRL ACTIVE (y) indicates the ( )PRESS CTRL ACTIVE option is active.

Lo Process Control Temperature - This is the low process control temperature safety.This safety is active when temperature control has been selected from the operatoroptions menu. An alarm or trip will be active on a drop in Process Temperaturebelow the respective setpoint values.


IIA. SAFETY SETPOINT FUNCTIONS (cont’d)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI PROCESS CTRL TEMP ***° --- --- (Move between fields with “NEXT” key.)


Hi Process Control Temperature - This is the high process control temperature safety.This safety is active when temperature control has been selected from the operatoroptions menu. An alarm will be active on an increase in Process Temperatureabove the respective setpoint values.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETLO OIL INJECT TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

Lo Oil Injection Temperature - This is the low oil injection safety. The alarm or trip will beactive if oil injection temperature drops below setpoint value after a time delay (LoOil Injection Temperature Bypass).

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI OIL INJECT TEMP ***° ***° ***° (Move between fields with “NEXT” key.)

Hi Oil Injection Temperature - This is the high oil injection temperature safety. The alarmor trip will be active on a rise in oil injection temperature above the respectivesetpoint values.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETLO SUCTION PRESSURE ***# ***# ***# (Move between fields with “NEXT” key.)

Lo Suction Pressure - This is the low suction pressure safety. This safety is active in boththe pressure or temperature control modes. An alarm or trip will be active on adrop in suction pressure below the respective setpoint values.


IIA. SAFETY SETPOINT FUNCTIONS (cont’d)

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI DISCHARGE PRESSURE ***# ***# ***# (Move between fields with “NEXT” key.)

Hi Discharge Pressure - This is the high discharge pressure safety. The alarm or trip willbe active on a rise in discharge pressure above the respective setpoint values.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETLO RUN OIL PRESSURE ***# ***# ***# (Move between fields with “NEXT” key.)

Low Run Oil Pressure - This is the running oil pressure safety. An alarm or trip will beactive if the net oil pressure (Manifold Minus Discharge) should drop below therespective setpoint values. This timer is active after the Run Cycle Oil PressureBypass timer has completed its cycle.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI START FLTR DIFF PR ***# ***# ***# (Move between fields with “NEXT” key.)

Hi Start Filter Differential Pressure - This is the filter differential safety for the start cycle. Ifthe filter inlet exceeds the filter outlet pressure alarm or trip setpoint values, beforethe Filter Differential Pressure Change-over timer has cycled, a High Start FilterDifferential Pressure alarm or trip will occur. After the timer has cycled, this safetyis inactive and the Hi Run Filter Differential Pressure setpoint is active.

SAFETY SETPOINTS (SETPT *) Safety Description ALRM TRIP RESETHI RUN FLTR DIFF PR ***# ***# ***# (Move between fields with “NEXT” key.)

Hi Run Filter Differential Pressure - This safety setpoint is active when the compressor isin the run cycle. An alarm or trip will be active if the filter inlet pressure exceeds thefilter outlet pressure by the respective safety setpoint values.



IIB. CONTROL LIMIT SETPOINT FUNCTIONS

The following is a list of the control limit setpoint menus (Column 2, Row 2), with a briefdescription of each.

When Dual Setpoint operation is desired, the Setpoint selection can be accomplished by aselector switch (not provided by Vilter) which is wired to Port 2 Module 0. If power isapplied to the module, then Control Limit Values for Setpoint #2 are active. When thepower is removed from the Module, then Control Limit Values for Setpoint #1 are active.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT SUCTION PRESS ON/OFF ***# ***# (Move between fields with “NEXT” key.)

Suction Pressure On/Off - The compressor will automatically cycle on and off at thesetpoints entered. If compressor shut down is desired on a suction pressure dropand a manual reset is required, set the cutout value below the Low SuctionPressure safety trip value. This will shut down the unit and a reset will be requiredto restart it.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT SUCT PR CAP INCREASE ***# ***# (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 3: option. ( )TEMP CTRL ACTIVE (y) indicates the (y)PRESS CTRL ACTIVE option is active.

Suction Pressure Capacity Increase - The capacity of the compressor will increase whensuction pressure is at or above the cutin setpoint, and the Capacity IncreaseSolenoid Off timer has timed out. Capacity will continue to increase until theSuction Pressure Capacity Increase cutout setpoint is reached. If closer systemcontrol is desired, set the cutin and cutout pressures at the same values. This willresult in a 1/10# difference in cutin and cutout pressures.


IIB. CONTROL LIMIT SETPOINT FUNCTIONS (cont’d)

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT SUCT PR CAP DECREASE ***# ***# (Move between fields with “NEXT” key.)


Suction Pressure Capacity Decrease - The capacity of the compressor will decrease whenthe suction pressure is at or below the cutin setpoint and the Capacity DecreaseSolenoid Off timer has timed out. Capacity will continue to decrease until theSuction Pressure Capacity decrease cutout setpoint is reached. If closer systemcontrol is desired, set the cutin and cutout pressures at the same values. This willresult in a 1/10# difference in cutin and cutout pressures.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT HI DSCH PR LOAD LIMIT ***# ***# (Move between fields with “NEXT” key.)

Hi Discharge Pressure Load Limit - The compressor will be prevented from loading if thedischarge pressure would reach the Cutout Setpoint. On a further increase indischarge pressure to the Cutin Setpoint, the compressor would be unloaded untilthe discharge pressure drops below the Cutout Setpoint.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT CAP CONTROL °F ON/OFF ***°F ***°F (Move between fields with “NEXT” key.)


Capacity Control °F On/Off - The compressor will automatically cycle on and off at thesetpoints entered. Capacity Control °F On/Off is only active if the TemperatureControl Active option is selected from the operator options menu. If compressorshut down is desired on a process temperature drop and a manual reset isrequired, set the cutout value below the Low Control Temperature safety trip value.This will shut down the unit and a reset will be required to restart it.



CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT CAP CONTROL °F INCR ***°F ***°F (Move between fields with “NEXT” key.)


Capacity Control °F Increase - The capacity of the compressor will increase when processtemperature is at or above the cut-in setpoint, and the Capacity Increase SolenoidOff timer has timed out. Capacity will continue to increase until the CapacityControl °F Increase cutout setpoint is reached.

However, if the suction pressure should drop below the Suction Pressure CapacityDecrease cutout setpoint, the Suction Pressure Capacity Decrease will override theCapacity Control °F Increase and prevent the compressor capacity from increasing.If the suction pressure should continue to decrease below the Suction PressureCapacity Decrease cutin setpoint, the capacity will be forced to decrease until thesuction pressure is above the cutin setpoint. This will help stabilize the suctionpressure, allowing for the process temperature to be gradually pulled down.

If closer system control is desired, set the cutin and cutout temperatures at thesame values. This will result in a 1/10°F difference in cutin and cutout temperatures.Process temperature control of the capacity is active only if the TemperatureControl Active option is selected from the operator options menu.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT CAP CONTROL °F DECR ***°F ***°F (Move between fields with “NEXT” key.)



IIB. CONTROL LIMIT SETPOINTS FUNCTIONS (cont’d)

Capacity Control °F Decrease - The capacity of the compressor will decrease when theprocess temperature is at or below the cut-in setpoint and the Capacity DecreaseSolenoid Off timer has timed out. Capacity will continue to decrease until theCapacity Control °F Decrease cutout setpoint is reached.

If closer system control is desired, set the cutin and cutout temperatures at thesame values. This will result in a 1/10°F difference in cutin and cutout temperatures.Process temperature control of the capacity is active only if the TemperatureControl Active option is selected from the operator options menu.

CONTROL LIMITS (SETPT *) Control Description VALUE LAG,CAPACITY STEP ***% --- (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 4: option. (y)LEAD/LAG ENABLE (y) indicates the ( )LEAD/LAG DISABLE option is active.

Lag, Capacity Step - The lag step value determines the increment that the lag compressoris allowed to load or unload on a call for capacity increase or decrease from thelead compressor. This setpoint is active only when the Lead/Lag Enable operatoroption is selected.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT MINIMUM RUN CAPACITY ***% --- (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 5: option. (y)MIN RUN CAP ENABLE (y) indicates the ( )MIN RUN CAP OFF option is active.



Minimum Run Capacity - The Minimum Run Capacity is the minimum capacity that thecompressor will be allowed to run. When the compressor is started, thecompressor will be loaded to the Minimum Run Capacity control setpoint minus 5%.This is done to prevent the capacity control from hunting, if the load is not greatenough to keep the compressor capacity at the Minimum Run Capacity setpoint.On a call for unloading, the compressor will unload until it reaches the MinimumRun Capacity control setpoint. The compressor capacity will remain there until thesuction pressure reduces and the compressor cycles off on the Suction PressureOn/Off control setpoint.

When the Lead/Lag Enable operator option is selected, the Minimum Run Capacityis automatically active. When the lead compressor reaches the Lead, Max CapFlag control setpoint and there is a demand for more capacity, the Lag compressorwill be allowed to start and load to the Minimum Run Capacity control setpointminus 5%. If there is a continued call for capacity, the Lag compressor will beallowed to load at its Lag, Capacity Step value.

When the Lead compressor calls for capacity reduction and the Lag compressor isabove the Minimum Run Capacity control setpoint, the Lag compressor will unloadat an amount of its Lag, Capacity Step value until it reaches the Minimum RunCapacity setpoint minus 5%. At this time, the lead compressor will unload until itreaches the Minimum Run Capacity control setpoint.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT LEAD,MAXIMUM CAP FLAG ***% ***% (Move between fields with “NEXT” key.)




Lead, Maximum Capacity Flag - The Lead, Maximum Capacity Flag control setpoint isactive when the Lead/Lag Enable operator option is selected. The Lead, MaximumCapacity Flag control setpoint is the setpoint that determines at what compressorcapacity the Lag compressor will be allowed to start up. When the lead compressorincreases in capacity above the control cutin setpoint, the lag compressor will beallowed to start, if the Start Lag Compressor Timer has timed out. Then, once theLag compressor is running and the lead compressor’s capacity increases above thecontrol cutin setpoint, the lag compressor will be allowed to load through the Lag,Capacity Step control setpoint. This control setpoint is active when the Lead/LagEnable operator option is selected.

NOTE:This setpoint is also used to energize the At Max Capacity Indicate module(Software Version 3.XX and below) which is used for feedback control purposeswhen controlling the capacity in the remote mode via the remote Increase andDecrease modules.

CONTROL LIMITS (SETPT *) Control Description CUTIN CUTOUT ECONOMIZER SOLENOID ***% ***% (Move between fields with “NEXT” key.)

Economizer Solenoid - This control limit determines when the Economizer solenoid isenergized. When the compressor capacity, measured in percent capacity, reducesbelow the Economizer Solenoid cutout setpoint, the solenoid is de-energized. Onan increase in compressor capacity above the Economizer Solenoid cutin setpoint,the solenoid is energized.

CONTROL LIMITS (SETPT *) Control Description FLA MAX MOTOR AMP LOAD LIMIT ***A ***A (Move between fields with “NEXT” key.)

Motor Amps Load Limit - This control limit is the motor full load current draw and themaximum current draw, this control limit only prevents the compressor from loadingand does not shut down the compressor if the maximum current draw setpoint isexceeded. The actual values entered may depend on particular circumstances.The function of the setpoints follows.


IIB. CONTROL LIMIT SETPOINTS FUNCTIONS (cont’d)

Motor Amps Load Limit (cont’d)

If the motor is operating at the FLA setting, the compressor is prevented fromloading any further. If the motor amps exceeds the MAX setpoint, the compressoris forced to unload until such time the current is at 1.0625 times above the FLAsetting. If the motor being used has a service factor below 1.15, use a value forFLA that is 10% lower than the MAX value.

CONTROL LIMITS (SETPT *) Control Description C/T RATIO CURRENT TRANSFORMER ***/5Amps (Move between fields with “NEXT” key.)

C/T Ratio - This is the Current Transformer Ratio. The value entered must agree with theCurrent Transformer Ratio on the current transformer being used. The currenttransformer is mounted in the compressor motor conduit box.



IIC. SETPOINT TIMER FUNCTIONS

The following is a list of the setpoint timer function menus (Column 2, Row 3), with a briefdescription of each.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAPACITY INCREASE SOLENOID ON *** SEC (Move between fields with “NEXT” key.)

Capacity Increase Solenoid On - In the automatic mode, if a capacity increase is desired,the capacity solenoid is energized to increase the capacity for this set length oftime. The solenoid is then shut off for a set period of time, Capacity IncreaseSolenoid Off, after which if the system requires a further increase in capacity, thesolenoid is energized. This allows time for the capacity increases to take effectbefore making another capacity adjustment.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAPACITY INCREASE SOLENOID OFF *** SEC (Move between fields with “NEXT” key.)

Capacity Increase Solenoid Off - This is the length of time the increase solenoid is notallowed to energize, even though an increase in capacity may be required. Afterthe timer has timed out, if an increase in capacity is still required, it can then takeeffect. This allows time for the last capacity increase pulse to take effect beforemaking another capacity adjustment.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAPACITY DECREASE SOLENOID ON *** SEC (Move between fields with “NEXT” key.)

Capacity Decrease Solenoid On - In the automatic mode, if a capacity decrease isdesired, the capacity solenoid is energized to decrease the capacity for this setlength of time. The solenoid is then shut off for a set period of time, CapacityDecrease Solenoid Off, after which if the system desires a further decrease incapacity, the solenoid is energized. This allows time for the capacity decreases totake effect before making another capacity adjustment.


IIC. SETPOINT TIME FUNCTIONS (cont’d)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAPACITY DECREASE SOLENOID OFF *** SEC (Move between fields with “NEXT” key.)

Capacity Decrease Solenoid Off - This is the length of time the decrease solenoid is notallowed to energize even though a decrease in capacity is required. After the timerhas timed out, if a decrease in capacity is still required it can then take effect. Thisallows time for the last capacity decrease pulse to take effect before makinganother capacity adjustment.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value SLIDE VALVE RETURN AT SHUTDOWN *** SEC (Move between fields with “NEXT” key.)

Slide Valve Return At Shutdown - This timer determines the length of time that thedecrease capacity solenoid is energized at shutdown, to return the slide valve to5% or less. If the slide valve returns to 5% capacity or less within this time period,the solenoid is de-energized. On a power failure and subsequent restoration ofpower, the timer will allow the decrease capacity solenoid to energize until the slidevalve returns to 5% or less or the timer times out.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CMP STARTER AUX CONTACT BYPASS *** SEC (Move between fields with “NEXT” key.)

Motor Starter Auxiliary Contact Bypass - The auxiliary motor starter contact is bypassedfor a set period during starting. If it does not close after the timer has cycled, thecompressor will be shut down and a motor overload failure will be displayed.Likewise, if some time after the set delay the auxiliary contact should open, thesame failure screen display will be shown.


IIC. SETPOINT TIMER FUNCTIONS (cont’d)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value OIL PUMP PRELUB BEFORE START *** SEC (Move between fields with “NEXT” key.)

Oil Pump Prelube Before Start - This is the length of time the oil pump will run, afterestablishing Lo Run Oil Pressure, to prime the oil circuit. After the timer has timedout, the compressor will start.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value OIL PRESS BYPASS ALLOW TIMER *** SEC (Move between fields with “NEXT” key.)

Oil Pressure Bypass Allow Timer - This timer permits short duration oil pressure dropsbelow the Lo Run Oil Pressure trip setting immediately after startup. The length oftime that the oil pressure can drop below the trip setting is determined by the OilPressure Failure Delay Timer. After the Oil Pressure Bypass Allow Timer times out,the Lo Run Oil Pressure trip setting is then active without a time delay.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value OIL PRESS FAIL DELAY TIMER *** SEC (Move between fields with “NEXT” key.)

Oil Pressure Failure Delay Timer - This timer determines the length of time that the oilpressure can drop below the trip setting of the Lo Run Oil Pressure safety atstartup. After the Oil Pressure Bypass Allow Timer times out, the Lo Run OilPressure trip setting is active without this time setting.



TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value LO OIL INJECTION TEMP BYPASS *** MIN (Move between fields with “NEXT” key.)

Lo Oil Injection Temperature Bypass - This timer bypasses the Low Oil InjectionTemperature safety setpoint during start. During startup, there is a possibility ofcold oil in the oil filters and oil manifold that would temporarily drop the oil injectiontemperature below the Lo Oil Injection Temperature. After the timer cycles, theLow Oil Injection Temperature safety is active.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value FILTER DIFF PRESS CHANGE-OVER *** SEC (Move between fields with “NEXT” key.)

Filter Differential Pressure Change-over - This timer bypasses the Hi Run Filter DifferentialPressure setting during the start cycle. The Hi Start Filter Differential Pressure willprotect against high filter differential during the start cycle. This is to prevent thecompressor being shutdown at start due to the cold oil creating an abnormally highoil pressure drop across the filters at startup. After the timer has cycled, the Hi RunFilter Differential Pressure safety is active.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value PUMP RUN LIMIT W/O OIL PRESS *** SEC (Move between fields with “NEXT” key.)

Pump Run Limit Without Oil Pressure - This timer establishes the maximum amount oftime that the oil pump is allowed to run without establishing oil pressure beforestarting the compressor.



TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value AUTO RESTART AFTER POWER FAIL *** SEC (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 2: option. (y)POWER-UP AUTO STRT (y) indicates the ( )POWER-UP MAN STRT option is active.

Auto Restart After Power Failure - This timer forces the microprocessor to wait for the settime period after a power failure before starting the compressor unit. By staggeringthe timer settings, the compressors can be allowed to start automatically, one at atime after a power failure to prevent excessive loads on the power system thatcould be caused by all of the equipment coming on line at the same time. ThePower-up Auto Start operator option must be selected for this timer setpoint to beactive.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAP HOLD SOLENOID OFF TIME *** SEC (Move between fields with “NEXT” key.)


Capacity Hold Solenoid Off Time - The Capacity Hold Off Time timer is active when theLead/Lag Enable operator option is selected. This timer determines the off portionof the Lag compressor capacity change pulse. This timer will be active when theLag compressor capacity is within 7%, but not closer than 2% of the Lagcompressor capacity hold value. If the Lag compressor Lag Cap Step is less than7%, and the lead compressor is calling for the lag compressor to increase capacity,the lag compressor may load at a rate slower than what the lead compressor isrequesting. To get the appropriate response, set the Cap Hold Off Time to a valueof about ½ of what the Cap Increase Solenoid Off Time setting is.


IIC. SETPOINTS TIMER FUNCTIONS (cont’d)

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value CAP HOLD SOLENOID ON TIME *** SEC (Move between fields with “NEXT” key.)


Capacity Hold Solenoid On Time - The Capacity Hold On Time timer is active when theLead/Lag Enable operator option is selected. This timer determines the on portionof the Lag compressor capacity change pulse. This timer will be active when theLag compressor capacity is within 7%, but not closer than 2% of the Lagcompressor capacity hold value.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value ANTIRECYCLE STRT TIMER (MIN) *** MIN (Move between fields with “NEXT” key.)

OPERATOR OPTIONS MENU Select desiredOption # 1: option. ( )HOT STARTS/HR (y) indicates the (y)ANTIRECYCLE TMR option is active.

AntiRecycle Start Timer - When a start has been attempted and the compressor is shutdown, the AntiRecycle timer is started. The compressor will not be allowed torestart until the AntiRecycle timer has timed out. The AntiRecycle Timer can alsoprevent the compressor from short cycling. When the compressor is stopped orshut down, the timer will start and the compressor will not be allowed to start untilthe timer has timed out. This timer can also be used to prevent the compressorfrom exceeding the manufacturers recommended hot starts per hour. This isaccomplished by setting the timer to equal the time interval of the manufacturersrecommended hot starts per hour (i.e. For 3 starts per hour, the timer should be setat 20 minutes).



TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value START LAG COMP TIMER (MIN) *** MIN (Move between fields with “NEXT” key.


Start Lag Compressor Timer - This timer prevents the Lag compressor from starting untilthe timer has cycled, provided the Lead compressor has loaded to theLead,Maximum Capacity Flag control setpoint and there is a demand for increasecapacity. This option is active when the Lead/Lag Enable operator option has beenselected.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value STOP LAG COMP TIMER (MIN) *** MIN (Move between fields with “NEXT” key.)


Stop Lag Compressor Timer - The Stop Lag Compressor Timer will determine when theLag compressor will shut down. The Lag compressor will shut down after the timerhas timed out, providing that the Lag compressor is at its Minimum Run Capacitycontrol setpoint and the Lead compressor has unloaded to the Minimum RunCapacity control setpoint, and there has not been an increase in capacity of theLead compressor for the duration of the Stop Lag Compressor Timer setting. Thisoption is active when the Lead/Lag Enable operator option has been selected.



TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value FORCE START LAG COMP (MIN) *** MIN (Move between fields with “NEXT” key.)


Force Start Lag Compressor - The Lag compressor will be forced to start and load, if theLead compressor has not reached the Lead, Maximum Capacity Flag controlsetpoint and there has been an uninterrupted demand for more capacity after theForce Start Lag Compressor timer has timed out. This timer is active only if theLead/Lag Enable operator option has been selected.

TIMER SETPOINTS (SEC,MIN,COUNTS) Timer Field Value HOT STRTS/HR COUNTER ** CT (Move between fields with “NEXT” key.)


Hot Starts/Hr Counter - When the number of compressor restarts within an hour reach thesetting, the compressor cannot be restarted for 1 hour from the last start. Thisprevents the number of hot starts/hr from exceeding the motor manufacturersrecommendation. The Hot Starts/Hr option from the operator options menu (seesection IID) must be selected for this feature to be active.


IID. OPERATOR OPTIONS

The operator options menu contains options that are selected by the operator. To make aselection in the operator options menu, enter the password. An arrow will appear to theleft of the option number. Pressing the ENTER key changes the arrow to an asterisk andallows you to select the desired option number with the UP & DOWN ARROW keys.Once the option number is selected to select or change the option, press ENTER to get anarrow, then press the NEXT key to move the cursor to the proper selection. To enter theselection, press the ENTER key twice. The “y” should now precede the current selection.

Depending on the software version, there are a total of five operator options available inthe operator options menu with the default values for each shown in the displays below.


Option #1 - This operator option is used to select either Hot Starts/Hour or the AntiRecycleTimer. Both are primarily used to prevent the operator from exceeding therecommended number of starts/hour. The AntiRecycle Timer is also used toprotect the compressor from short cycling, by delaying the restarting of thecompressor after shut down.

OPERATOR OPTIONS MENU Select desiredOption # 2: option. ( )POWER-UP AUTO STRT (y) indicates the (y)POWER-UP MAN STRT option is active.

Option #2 - This operator option deals with restarting the compressor after a power failure.The Auto Start on Power Failure features a timer (Auto Restart After Power Fail),which may be set to vary the startup of compressor to prevent an excessive load ifall the electrical load would come on line at one time. The Manual Start On PowerFailure option allows the operator to manually restart the compressor after a powerfailure.


IID. OPERATOR OPTIONS (cont’d)


Option #3 - This operator option allows the operator the option of controlling thecompressor by process temperature through the Temp Ctrl Active operator optionor pressure control through the Press Ctrl Active operator option.

If the Temp Ctrl Active operator option is selected as the controlling parameter, thesuction pressure control will override the process temperature control and force thecompressor to unload when the suction pressure reaches the unload setpoints.This will help to stabilize the suction pressure, allowing for the process temperatureto be gradually pulled down. If the override feature is not wanted, set the SuctionPressure Capacity Decrease cutin and cutout setpoints to a low value (i.e. 30”Hg).

OPERATOR OPTIONS MENU Select desiredOption # 4: option. ( )LEAD/LAG ENABLE (y) indicates the (y)LEAD/LAG DISABLE option is active.

Option #4 - This operator option is used if the operator desires Lead/Lag operationbetween two VRS Twin Screw Compressors. This operator option is selected foreach compressor by selecting the Lead/Lag Enable option. The Lead and Lagcompressor is selected via the status of Port 2 Module 1. If the input to module 1 isON (110VAC applied to module 1), then that compressor is selected to be theLEAD Compressor.

The input for the lag compressor module 1 must be off (no power applied to themodule). The Lead/Lag communication between the lead and lag compressors isaccomplished over the Bitbus communication port.

In order for this option to function properly, the microprocessor panels must haveunique Node addresses, as selected on the circuit board.



Option #4 - (cont’d)

The required node addresses are Node 1 and Node 50. These are selected byBerg pins at location labeled “Network Address Mode” (see Figure 9). All Bitbuscommunication is carried out by Node 1. The other unit will always be Node 50.After the node addresses have been selected for the microprocessors, they can bechecked by moving to the screen in the third column on the bottom row. There willbe an indication of the node address selected.

The suction pressure (or process temperature) of the Lead compressor is used todetermine loading and unloading. The loading and unloading rate of the lead andlag compressors is determined by the Lead compressor load/unload interval timers.

Figure 9. Network Address Mode Jumper Locations



OPERATOR OPTIONS MENU Select desiredOption # 5: option. ( )MIN RUN CAP ENABLE (y) indicates the (y)MIN RUN CAP OFF option is active.

Option #5 - When the operator option Min Run Cap Enable is selected, the minimumcapacity that the compressor is allowed to run at is determined by the MinimumRun Capacity setpoint. When the compressor is started, the compressor will beallowed to load to Minimum Run Capacity setpoint minus 5%. This is done toprevent the compressor from hunting if the load is not great enough at the MinimumRun Capacity setpoint when the lag compressor is started.

However, when Lead/Lag Enable operator option #4 is selected, the Lead/Lagalgorithm will determine that the Minimum Run Capacity setpoint will be activeduring the following conditions;

1. When the compressor is selected as the Lead compressor, and themicroprocessor is in the Auto Mode, the Minimum Run Capacity setpoint isalways active (whether Option #5 Min Run Cap Enable is selected or not).The setpoint is used to determine when the Lead compressor is back at itsminimum capacity. This is one of the conditions used to start the Stop LagCompressor Timer.

2. When the compressor is selected as the Lag compressor and has beenplaced into the Lead/Lag algorithm by the Lead compressor, then theMinimum Run Capacity setpoint is active. Showing the Lead compressorfail, the Lag compressor will fall out of the Lead/Lag algorithm. In this case,the setpoint will no longer be active UNLESS operator option #6 Min RunCap Enable has been selected to enable the Minimum Run Capacitysetpoint. The setpoint will stay active.

In the event of the Lead compressor failing, it may be desirable to have thelag compressor unload below the Minimum Run Capacity setpoint during lowload conditions to try to insure that the compressor won’t shut down. In thiscase, operator option #5 Min Run Cap Off should be selected for the Lagcompressor.


IIE. RECALIBRATE TRANSDUCERS

RECALIBRATE TRANSDUCERS VALUE Channel #1 = ***mV *** Channel = SUCTION TEMP

This menu provides a means for the recalibration of the Transducers, RTDs, Amperageand Potentiometer channels. The menu is located in column 3 row 3. The following is alist of the channel numbers and the corresponding parameter for each.

CHANNEL #1 SUCTION TEMP#2 DSCH TEMP#3 PROCESS TEMP#4 OIL INJ TEMP#5 SUCT PRESS#6 DSCH PRESS#7 MANIFOLD PR#8 FILTER IN PR#9 GROUND#10 RESERVED#11 % CAPACITY#12 RESERVED#13 REFERENCE mV#14 MOTOR AMPS#15 SBX TEMP CH1#16 SBX TEMP CH2#17 SBX TEMP CH3#18 SBX TEMP CH4

To calibrate the pressure, temperature and Amps channels, use the following instructions.

1) Enter the password, EDIT, NEXT, NEXT, ENTER. The cursor will appear to the leftof the channel #.

2) Press ENTER. An asterisk will replace the cursor. Use the UP & DOWN ARROWkeys to select the channel to be calibrated.

3) Press ENTER when desired channel is displayed (Suction Pressure is displayed inexample). The cursor replaces the asterisk.


IIE. RECALIBRATE TRANSDUCERS (cont’d)

RECALIBRATE TRANSDUCERS VALUE Channel #5 - ****mV *** Channel = SUCT PRESS

4) Press NEXT. The cursor moves to the left of the Channel value.

5) Press ENTER. Again, an asterisk replaces the cursor. Use UP & DOWN ARROWkeys to force the Channel value to agree with the actual system pressure ortemperature.

The calibration on the pressure channels can be done at any pressure, but it isrecommended that calibration be done at 0# or atmospheric pressure. All the channelscan be calibrated in the same manner, except for the Capacity potentiometer.

To calibrate the Capacity potentiometer, use the following procedure.

1) Go to column 3 screen 3 (Recalibrate Transducer Menu).

2) Enter the password, EDIT, NEXT, NEXT, ENTER. The cursor (➔ ) will appearpointing at the channel # location. This is called the “cursor position mode”.

3) Press ENTER. Now an asterisk (*) will replace the cursor. This is called the “editmode”.

4) Use the UP ARROW key to select the % Capacity channel. The following menu willbe displayed.

RECALIBRATE TRANSDUCERS VALUE Channel #11 = ****mV *** Channel = % CAPACITY

5) Press ENTER again so that the cursor reappears, returning to the “cursor positionmode”.

6) Press the NEXT key, positioning the cursor at the value location.

7) Press ENTER key, the following menu will appear:



7) (cont’d)

RECALIBRATE POTENTIOMETERS (PG.1) Set pot at MINIMUM mV and press ENTER(Press INC or DEC to move slide valve)Channel #11 = ****mV

Now the potentiometer should be checked for any problems. Have a helper slowlyturn the potentiometer counterclockwise. Observe the millivolt reading to insurethat the reading increases steadily and does not suddenly jump, which wouldindicate a defect in the potentiometer.

Return the potentiometer to the minimum millivolt reading by turning thepotentiometer fully clockwise, again watch for a smooth decrease in the millivoltreading. Now press ENTER. This will set the Millivolts at minimum capacity. Thefollowing screen will appear.

RECALIBRATE POTENTIOMETERS Now set pot at MAXIMUM mV & press ENTER. (Press INC or DEC to move slide valve)Channel #11 - ****mV

8) Rotate the potentiometer gear fully counterclockwise and press ENTER. This willset the millivolts at maximum capacity.

9) At this point, the microprocessor may return to the Active Alarms and Trips screenand show an alarm and trip for % Capacity. Press the RESET to clear the alarmand trip.

NOTE: With these steps, the potentiometer has now been calibrated so that its full travelwill correspond to 0 to 100%. When the potentiometer gear is re-engaged with theslide valve gear, the slide valve gear will not move the potentiometer its full travel,so a second calibration procedure is required.

10) Leave the potentiometer at the 100% reading. Press the MAN button. This willstart the oil pump and energize the decrease solenoid. This will move the slidevalve towards the minimum capacity position. When the slide valve indicatorindicates that the slide valve is at its minimum position, press the STOP button.



11) Turn the potentiometer fully clockwise, which corresponds to 0% capacity at thispoint. Now turn the potentiometer counterclockwise about 4 - 5 teeth (about 5 - 6%on the screen). Now mate the two gears back together again. This will insure thatthe potentiometer is not mechanically damaged when the compressor backs downto its minimum slide valve position in normal operation.

12) At this point, the compressor can be started up normally. Notice that when thecompressor moves to its fully loaded position, the microprocessor screen willindicate something less than 100%. This is because the first calibration procedurecalibrated the potentiometer for the full travel of the potentiometer to correspond to0 - 100%.

13) To calibrate the potentiometer to the actual travel of the slide valve, go to column 3screen 3 (Recalibrate Transducer Menu).

14) Enter the password, EDIT, NEXT, NEXT, ENTER.

15) Press ENTER.

16) Select the % Capacity channel.

17) Press ENTER again so that the cursor reappears.

18) Press the NEXT key, positioning the cursor at the value location.

19) Press ENTER key. The following menu appears.

RECALIBRATE POTENTIOMETERS (PG.1) Set pot a MINIMUM mV and press ENTER. (Press INC or DEC to move slide valve)Channel #11 = ****mV

Now press the DEC button to reduce the compressor capacity to minimum. Nowpress ENTER. This will set the Millivolts at minimum capacity. The followingscreen will appear.

RECALIBRATE POTENTIOMETERSNow set pot at MAXIMUM mV & press ENTER (Press INC or DEC to move slide valve)Channel #11 = ****mV

20) Now press the INC button and increase the compressor capacity to maximum.Press ENTER. This will set the millivolts at maximum capacity. The potentiometerwill now be calibrated to read the actual capacity.


IIF. DIGITAL PORT STATUS

DIGITAL PORT STATUS Reference YOURLocation:0 1 2 3 4 5 6 7 wiring diagramPort #1: * * * * * * * * for port I/OPort #2: * * * * * * * * descriptions.

This is a Troubleshooting screen display. This screen display is located in column 3, row4. Ports 1 through 8 are available for display. To change the port numbers in the display;

1) Enter the password ENTER, NEXT, NEXT, ENTER. A cursor will appear to the leftof the port number.

2) Press the ENTER key. An asterisk will replace the cursor.

3) The up and down arrow keys can be used to view additional ports.

In the case of inputs, a “0” in the display designates the input is “off” or no voltage at theinput. A “1” designates the input is “on” or there is voltage at the input. In the case of theoutputs, if the status is “1”, the red LED on the corresponding module should be on. Thismeans the microprocessor is telling the output to turn on. If the output is not “on”, checkthe voltage at the module. If there is no voltage, either the module fuse is blown or themodule is defective. By referring to the wiring diagram supplied with the unit, the I/O PortStatus can be reviewed for trouble shooting.

IIG. FORCE OUTPUTS ON

FORCE OUTPUTS ON Use key to force Port # ** selected output on. Output # **: *** Comp relay output is monitored & limited.

This is a Troubleshooting screen display. This screen display is located in column 3, row5. To force an output on:

1) Enter the password EDIT, NEXT, NEXT, ENTER. The cursor will appear to the leftof the port #.

2) To select the port #, press ENTER. An asterisk will appear.

3) Use the UP & DOWN ARROW keys to select the port.

4) Press ENTER to lock in port selection.


IIG. FORCE OUTPUTS ON (cont’d)

5) Press NEXT to move the cursor to the output #.

6) Press ENTER. An asterisk will appear. Again, use the UP & DOWN ARROW keysto select proper output #.

7) Now, with the asterisk showing, use the RIGHT ARROW key to force output “on”.

When forcing the compressor starter output, the maximum length of time the output canbe forced is limited to 5 seconds, for safety reasons.

IIH. SET DATE AND TIME

SET DATE AND TIME Set time in militaryDate: **/ **/ ** format. All eventsTime: **: **: ** are timestamped fromDay of Week: *** this clock setting.

To set the proper date, time, and day of the week, go to the Set Date and Time screendisplay (column 3, row 6).

1) Enter the password EDIT, NEXT, NEXT, ENTER. The cursor will appear to the leftof the Date.

2) Press the NEXT key until the cursor appears to the left of the parameter you wantto change.

3) Press ENTER and an asterisk appears. Use the UP & DOWN ARROW keys toadjust the display.

4) Press ENTER to lock it in. Adjust the remaining parameters in the same manner.


III. SEQUENCE OF OPERATION

The operating sequence has been divided into 6 separate segments, the Oil PressureSystem, Oil Filter System, Oil Temperature System, Capacity Control, Anti-Recycling andMotor Interlock, and Lead/Lag Control. This information regarding a particular portion ofthe whole operating sequence can be easily found. In the following descriptions, thewords in italics are the screen displays for the Safety Setpoints, Control Setpoints, andTimer Values.

OIL PRESSURE SYSTEM CONTROL

For all applications, the oil pump will operate according to the following description.

After the oil pump starts, the Oil Pump Prelub Before Start timer is started. After the timertimes out, the net oil pressure (Manifold Minus Discharge) is monitored. When the net oilpressure rises above the Lo Run Oil Pressure reset value, the compressor will be allowedto start. If the Lo Run Oil Press reset value is not reached before the Pump Run LimitW/O Oil Pressure timer expires, the start cycle is aborted and a “Run Oil Press” failure isindicated.

Once the start cycle has been initiated, the Oil Pressure Bypass Allow Timer will bestarted. While the Oil Pressure Bypass Allow Timer is active, the Oil Failure Delay Timerwill allow the oil pressure to drop momentarily below the Lo Run Oil Pressure trip value forthe length of its time value, after which, if the oil pressure has not increased above the tripvalue, the compressor will be shut down and a failure will be displayed.

After the Oil Pressure Bypass Allow Timer times out, any drops below the Lo Run OilPressure trip value will immediately shut down the machine and display a failure.

OIL FILTER SYSTEM

Once the start cycle has been initiated, the Fltr Diff Press Change-over timer will bestarted. During this time period, the Hi Start Fltr Diff Pr safety setpoint is active. If thefilter inlet exceeds the filter outlet pressure alarm or trip setpoint values, a Hi Start Fltr DiffPr failure alarm or trip will occur. After the timer has cycled, the Hi Run Filter Diff Pr isactive.

Due to the higher viscosity of cold oil in the oil system when the compressor is started, theHi Run Filter Diff Pr safety may be exceeded and the compressor would be shutdown atstart. To prevent this from happening, the values for the Hi Start Fltr Diff Pr safety shouldbe set higher than the values for the Hi Run Filter Diff Pr safety.


III. SEQUENCE OF OPERATION (cont’d)

OIL TEMPERATURE SYSTEM

There are (2) separate oil temperature limits which are monitored at various times duringcompressor operation.

At start up, the Lo Oil Inject Temp is bypassed for a set time period, by the Lo Oil InjectionTemp Bypass timer. If the oil injection temperature is below the Lo Oil Inj Temp trip valueafter the time delay has expired, the compressor will be shutdown and a failure isdisplayed.

Protection against too high of an oil injection temperature is provided by the Hi Oil InjTemp safety. If the oil temperature exceeds the trip setpoint, the compressor will shutdown and a failure will be displayed.

CAPACITY CONTROL

The compressor will not be allowed to start if the capacity slide valve is above 5%. Whenattempting to start the compressor with slide valve above 5%, the oil pump will start andthe decrease capacity solenoid will be energized to drive the slide valve below 5%. Oncethe capacity is below 5%, the decrease solenoid will be de-energized.

The Slide Valve Return At Shutdown timer determines the length of time that the decreasecapacity solenoid is energized at shutdown, to return the slide valve to 5% or less. If theslide valve returns to 5% capacity or less, within this time period the solenoid is de-energized. On a power failure, and subsequent restoration of power, the timer will allowthe decrease capacity solenoid to energize until the slide valve returns to 5% or less or thetimer times out.

During compressor operation, the capacity slide valve can be controlled eitherautomatically or manually, through the microprocessor.

In the automatic mode, the amount of time the capacity control solenoids are energized orde-energized in both the increase and decrease directions is controlled by the CapacityIncrease Solenoid On, Capacity Decrease Solenoid On, Capacity Increase Solenoid Off,and Capacity Decrease Solenoid Off timers. These time delays are provided to limit thelength of time that the solenoids are energized. This is needed to allow the suctionpressure to stabilize between capacity increases or decreases. This will prevent thecapacity slide valve from hunting, overshooting and undershooting the desired suctionpressure or process temperature control values.



CAPACITY CONTROL (cont’d)

In manual control, the timers do not control the length of time that the capacity controlsolenoid can be energized. The capacity control can be energized continuously bydepressing either the INCREASE or the DECREASE key. Once the INCREASE orDECREASE key is released the % capacity value is recorded. Should the capacity slidevalve drift more than 7% away from the recorded value, the solenoids will be continuouslyenergized until it is less than 2.5% away from the recorded value.

ANTI-RECYCLING AND MOTOR INTERLOCK

Two different options are provided for preventing excessive compressor motor startingand/or short cycling. These options are selected from the first operator options menu.

The AntiRecycle Tmr operator option does not allow the compressor to restart until theAntiRecycle Strt Timer has timed out. If the compressor starts and immediately shuts off,the compressor cannot be restarted until the timer times out. The AntiRecycle Strt Timeroption time period should be set so that the number of starts that are allowed per hour areequal to the number of hot starts that the motor manufacturer allows per hour.

The Hot Starts/Hr counter allows the compressor motor only a set number of starts perhour. If this number of starts is exceeded within an hour, the compressor will not beallowed to start until an hour has elapsed since the earliest attempted start.

The control system also incorporates an input from an auxiliary contact from thecompressor motor starter. If this contact is not closed after the Cmp Starter Aux ContactBypass has cycled, the compressor is shut down and a trip is indicated. If the auxiliarycontacts open while the compressor is running, the compressor is shut down and a trip isindicated.

LEAD/LAG COMPRESSOR CONTROL

The lead/lag control function will only operate if the Lead/Lag Enable option is selected forboth the lead and lag compressor; the node addresses must be set on the NetworkAddress mode (refer to section IID); the lead compressor being selected by applyingpower to the digital input module located at Port 2, Module #1; and the microprocessorsbe communicating through the Bitbus port. The following description is the sequence ofoperation for lead/lag control.



LEAD/LAG COMPRESSOR CONTROL (cont’d)

When the lead compressor is at its Lead,Maximum Cap Flag and there is an uninterruptedcall for more capacity after the Start Lag Comp Timer has cycled, the lag compressor willbe started. The lag compressor will load to 5% below the Minimum Run Capacity setpoint.This is done to prevent the capacity control from hunting, if the load is not great enough tokeep the compressor capacity above the Minimum Run Capacity setpoint. On a call forunloading, the compressor will unload until it reaches the Minimum Run Capacity controlsetpoint and will remain there until the suction pressure reduces and the compressorcycles off on the Suction Pressure On/Off control setpoint.

The lag compressor Minimum Run Capacity setpoint may be disabled under the OptionsMenu, however, when the lag compressor has been placed into the sequencing algorithm,this setpoint will then be active.

After the lag compressor has started, the lead compressor capacity may back off from100%, responding to the control parameter setpoints. The lead compressor will not loadthe lag compressor until the lead compressor has loaded back up to Lead, Maximum CapFlag setpoint.

When the lead compressor does reach maximum capacity setpoint again, capacity holdvalues are sent to the Lag compressor at the load and unload rate of the Lead compressortimers. The Lag Capacity Step value determines the increment that the lag compressorwill be allowed to load and unload.

i.e. If the Lag Capacity Step value is set at 10% and the lag compressor capacity is at30%, when the lead compressor determines that additional capacity is required, thenew capacity value that the lag compressor will be told to go to is 30% + 10% =40%.

The lag compressor capacity slide will be forced continuously until its capacity is within 7%of the capacity hold value it receives. The capacity slide is pulsed at a rate determined byits Capacity Hold Solenoid On Time and Capacity Hold Solenoid Off Time timers settings,until its capacity is within 2% of the capacity hold value it received.

On unloading, when the lag compressor reaches its Minimum Run Capacity setpointminus 5% and a further reduction in capacity is required, the lag compressor will continueto run and the lead compressor will start unloading.




When the lead compressor reached the Minimum Run Capacity setpoint, themicroprocessor is calling for a reduction in capacity, and the Stop Lag Comp Timer hascycled, the lag compressor will then be shut down. Should a low suction pressure alarmoccur (on either compressor) before the Stop Lag Compressor Timer times out, indicatingthat suction pressure is getting too low, the lag compressor will be forced off, allowing thesystem to stabilize before a suction pressure failure occurs.

NOTE: An active suction pressure alarm on either the lead or lag machine will prevent thelag machine from being started within the sequencing algorithm.

To summarize the conditions required for the Lag Compressor Stop timer to cycle:

1. The lag compressor must be at or below Minimum Run Capacity setpoint.

2. The lead compressor must be at or below Minimum Run Capacity setpoint.

3. The lead compressor must be calling for unloading.

The lead compressor will force the lag compressor to start if there has been anuninterrupted call for more capacity and the lead compressor fails to reach the Lead,Maximum Cap Flag setpoint within the time setting of the Force Start Lag Comp timer.

This could occur if there were a mechanical or electrical malfunction preventing thecapacity slide from fully loading or if there were a safety trip on the lead compressor. Afterthe lag compressor has been forced on, it will load and unload off of its own setpoints.

The recommended procedure to setup and start the Lead and Lag compressors whenboth machines are stopped is as follows. However, before the setup and start procedurecan take place, all other normal operating setpoints, timers, safeties, and operatingoptions should have been entered and both compressors are ready to start.

1. Enter control setpoints on lead compressor.

2. Enter the Lead, Maximum Cap Flag cutin and cutout setpoints for the Lead compressor.

3. Enter the Minimum Run Capacity cutin setpoint for both compressors.




4. Enter load and unload timer intervals for both compressors.

5. Enter the Start Lag Comp Timer value, the Stop Lag Comp Timer value and the Force Start Lag Comp timer on the lead compressor.

6. Select Lead/Lag Enable option from options menu on both compressors.

7. Start the Lead compressor by pressing “Auto” key. The lag compressor will start automatically when the lead compressor determines to do so.

Pressing the STOP key on either compressor will select the Lead/Lag DISABLE option forthe compressor and take the compressor out of the sequencing algorithm. Thecompressor will not be placed back into the sequencing algorithm until the Lead/LagEnable option is selected again from the Options Menu. Also, a loss of Bitbuscommunication (for instance the cable gets cut) will result in both compressors reverting toLocal setpoint control.

LEAD/LAG OPERATING SCREENS

With the Lead/Lag Enable option selected, here are the various operating screens thatcould be encountered with a short explanation of each.

The following current value display screens are for the Lead Compressor when itsLead/Lag Enable option is selected;

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Ready” : COMPRESSOR STOP

This display is the lead compressor and the compressor is off. There are no active trips,the compressor is available to run.



LEAD/LAG OPERATING SCREENS (cont’d)

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Run” : MINRUN CAP

This display is the lead compressor and the compressor is running. The compressor isloading to its Minimum Run Capacity setpoint.

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Run” : AUTO CAP

This display is for the lead compressor and it is running. The compressor has loadedbeyond its Minimum Run Capacity setpoint and is being controlled from its capacity controlsetpoints.

The following current value display screens are for the Lag Compressor when itsLead/Lag Enable option is selected:

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Ready” : COMPRESSOR STOP

This display is for the lag compressor and it is off. There are no active failures. The lagcompressor HAS NOT been placed into the sequencing algorithm or has been taken outof the sequencing algorithm. This will occur if the MAN key has been pressed on the leadcompressor, or if the Lead/Lag Enable option on the Lead compressor has beendeselected, or if the Lead compressor is in the LEAD “Ready”:Compressor Stop mode.




SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Wait” : COMPRESSOR STOP

This display is for the lag compressor and it is off. There are no active failures. The lagcompressor HAS been placed into the sequencing algorithm and is waiting for a “Start”command from the lead compressor. The lag compressor MAN and AUTO keys aredisabled in this mode. Note that an active suction pressure alarm on either the lead or lagcompressor will inhibit the lag compressor from starting.

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : MINRUN CAP

This display is for the lag compressor and the compressor is running. The compressor isloading to the Minimum Run Capacity setpoint minus 5%.

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : % CAP HOLD

This display is for the lag compressor and the compressor is running and is in thesequencing algorithm. The compressor has loaded beyond the Minimum Run Capacitysetpoint and is being controlled from the lead compressor which is sending “CAPHOLD”values. The capacity hold values are determined in the following manner, the current lagcompressor’s current capacity plus or minus the lag compressor’s Lag, Capacity Stepvalue. A new capacity hold value is sent to the lag compressor every time the leadcompressor’s capacity control timers need to adjust compressor capacity.




SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : SETPT CAP

This display is for the lag compressor and the compressor is running. The compressorhas loaded beyond its Minimum Capacity setpoint and has been placed into thesequencing algorithm. It is currently being controlled from its capacity control setpoints.This mode is usually seen when the Lag compressor has first been placed into thesequencing algorithm. It is a “transitional” mode. Within a few seconds, the Leadcompressor will issue a capacity hold value to the Lag compressor.

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : AUTO CAP

This display is for the lag compressor, the compressor is running, and is NOT in thesequencing algorithm. The compressor has loaded beyond its Minimum Run Capacitysetpoint and is being controlled from its capacity control setpoints. It is not beingcontrolled from the lead compressor. This will occur if the lead compressor’s MAN key ispressed, if the lead compressor is turned off, if the lead compressor fails, or if Bitbuscommunication fails. The lag compressor will be placed back into % Cap Hold modewhen the lead compressor is restarted or if Bitbus communication is re-established.

To avoid complications when changing the Lead/Lag switch position, the switch should bechanged when both machines are off and then both started as previously describedabove. However, the switch can also be changed when both machines are running and inthe sequencing algorithm.

When this is done, for approximately 20 seconds, the compressors will be forced into“transitional” states. The lead compressor (now the lag compressor) will first be switchedinto the following mode;

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : SETPT CAP



LEAD/LAG OPERATING SCREEN (cont’d)

The new lead compressor will be switched into the following mode;

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Run” : % CAP HOLD

After 20 seconds, both compressors will be placed into the sequencing algorithm. The lagcompressor will be placed into the following mode;

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Run” : % CAP HOLD

The lead compressor will then be placed into the following mode;

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Run” : AUTO CAP

If the Lead/Lag switch position is changed when the current lag compressor stopped andin the following conditions:

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Wait” : COMPRESSOR STOP

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LAG “Ready” : COMPRESSOR STOP




After 20 seconds, the mode will change to the following:

SUCT DSCH OIL MNFLD FLTR %CAP AMPS SP***# ***# ***# ***# ***# ***% ***A ****° ***° ***°Mode: LEAD “Ready” : COMPRESSOR STOP

The lead compressor will then have to be manually started. It is highly recommended thatwhen changing switch position, after approximately 30 seconds the compressor mode bechecked to see if the microprocessor is in the expected mode.



IV. REMOTE CONTROL OPTIONS

The following is a list of hard wired remote control options for the twin screw compressorunit, and which module that is used for the specific option. Port 3 listed for version 3.XXand up will require an additional SBX expansion board.

DIGITAL INPUTS

Port 2 Module #0: Dual Setpoint

When this module is de-energized, the #1 setpoint is active and all pertinent controls andsafeties associated with the setpoint are active. When the module is energized, then the#2 setpoint is active and all pertinent controls and safeties associated with the setpoint areactive.

Port 2 Module #1 (Version 3.XX and up): Lead/Lag Select

When power is supplied to this module from the lead/lag select switch, the compressor isselected as the lead compressor.

Port 2 Module #2: Remote/Local

When the module is in the remote mode (power to the module), the capacity slide valvecontrol will be through Port #2 Modules #4 and #5. In the local mode (no power to themodule), the Capacity Increase and Capacity Decrease setpoints for the capacity slidevalve control will be controlled locally by the microprocessor. The microprocessor must bein the “AUTO” mode to run in remote mode for capacity slide valve control. If the “MAN”mode on the microprocessor is selected, any increase or decrease in the capacity must bedone with the increase and decrease keys on the microprocessor key pad.

Port 2 Module #3: Remote Start/Stop

With power applied to the module, the unit will be allowed to start depending on theSuction Pressure On/Off setpoints. With no power applied to the module, the unit will notbe allowed to start. This feature will be active at all times.


IV REMOTE CONTROL OPTIONS (cont’d)

DIGITAL INPUTS (cont’d)

Port 2 Module #4: Remote Increase

When this module is on and the remote/local module is in the remote mode, the capacityslide valve solenoid is energized to increase the capacity of the compressor. However,the capacity slide valve will be prevented from increasing the capacity remotely if the unitis off, the remote decrease is energized or the maximum amperage of the motor isexceeded. If the Port 2 Module #2 is in the local mode, remote increases cannot be done.

Port 2 Module #5: Remote Decrease

When this module is on and the remote/local module is in the remote mode, the capacityslide valve solenoid is energized to decrease the capacity of the compressor. However,the capacity slide valve solenoid will be prevented from decreasing the capacity remotely ifthe unit is off, or remote increase is energized. If the Port 2 Module #2 is in the localmode, remote decreases cannot be done.

Port 2 Module #7: Auxiliary #1 Cutout

With power to this module, the unit will function normally. If the power is removed fromthis module at any time, the microprocessor will display an AUX #1 FAILURE and the unitwill stop or be prevented from starting. To restart the unit, the module must be energizedand the failure must be acknowledged with a reset.

Port 3 Module #0 (Version 3.XX and up): Auxiliary #2 Cutout

With power to this module, the unit will function normally. If the power is removed fromthis module at any time, the microprocessor will display an AUX #2 FAILURE and the unitwill stop or be prevented from starting. To restart the unit, the module must be energizedand the failure must be acknowledged with a reset.

DIGITAL OUTPUTS

Port 1 Module #1: Remote Alarm Output

This module will de-energize whenever there is an alarm or a trip condition. This modulewill re-energize when the reset button is pushed, even if the alarm or trip condition is notcleared.


IV. REMOTE CONTROL OPTIONS (cont’d)

DIGITAL OUTPUTS (cont’d)

Port 1 Module #2: Remote Trip Output

This module will de-energize whenever there is a trip condition. This module will re-energize when the reset button is pushed, even if the trip condition is not cleared.



V. TROUBLESHOOTING GUIDE

Before applying power to the microprocessor panel, all wiring to the panel should be perNEC. Specifically check for proper voltage and that the neutral is grounded at the source.This source should be a separate control transfer. This will minimize the EMI (noise)transmitted to the microprocessor board by other equipment connected to the same mainpower source. An equipment ground should also be run to the panel.

If a problem arises with the microprocessor panel, some additional preliminary checksshould be made.

❋ Check to make certain that all AC wires are physically run along the left side of the board.Keep all AC wires away from the transducer wires, which are located on the right side ofthe panel. Also, Do not allow AC wires to drape across the microprocessor board. Theidea is to isolate the AC wires away from the board and the left side of the panel.

❋ Check the main AC voltage. It should be 110V to 120V.

❋ With a digital voltmeter, check the voltage between the Green earth ground to thecompressor unit skid. It must be 0.0 Volts AC.

❋ With a digital voltmeter, check the voltage between the Green earth ground and the Whiteneutral. It must not exceed 1.0 Volts AC.

❋ During shipment, terminal connections can loosen. Check all DC wiring to themicroprocessor terminal blocks to make sure all wires are tight. Also check that allremovable terminal blocks are pushed entirely into the sockets. Make sure all cables(display and keypad) are pushed entirely into the sockets and locked.

❋ Check the pressure transducer panel to make sure all wire nuts connecting the pressuretransducer wire and shielded cable are tight. Physically inspect the shielded cable insidethe transducer box to make sure the shield wire is clipped and the end of the cable istaped. The shield wire should be grounded in one location only -- inside themicroprocessor panel.

❋ Check junction boxes for the RTD’s to make sure wire nuts connecting RTD’s andshielded cable are tight. Again, inspect shield wire to see that it is properly clipped, taped,and grounded in one spot only -- inside the microprocessor panel.

❋ Make sure that the shields on all wires for the RTD’s and Transducers have not beenstripped back too far at the terminal strips at the microprocessor board.

ORIGINAL ISSUEVRSMICRO -61- 7-95

V. TROUBLESHOOTING GUIDE (cont’d)

❋ Check the back-lit display wires (2 wires) that connect to the terminal block on the RS232port below, so they do not physically hand over the AC modules when the panel door isclosed. Make sure the wire is shielded type.

❋ Make sure no 115VAC wires were run/added to the conduit which carries the shieldedcable transducer wiring.

❋ In the event of a problem with the microprocessor, the following guide provides steps totake to help in determining the cause.

PROBLEM POSSIBLE SOLUTION

Microprocessor boarddoes not power up -nothing appears onthe display.

a. Check brightness potentiometer located in upper left corner ofboard. (Turn counterclockwise to increase brightness).

b. Check if AC power is run into the panel. Does power appear atthe board? Check for correct voltage (115 or 230 VAC).

c. Remove power from panel and check .25 amp fuse located onbottom of board.

d. Check to see that display cable is properly plugged in. Is cableplugged in backwards? Is cable fully inserted in header andlocked down?

e. Check to see that keyboard cable is properly plugged in. Is cableplugged in backwards? Is cable fully inserted in header andlocked down?

f. Check1. to see if a programmed EPROM is plugged in the board.2. that the EPROM is oriented properly and that all pins are

inserted into the socket (U20).3. that the “Code” and “Data” site jumpers are setup properly.

g. Reapply power to board and watch red and green LED’s on boardas power is applied to board. The microprocessor goes through anumber of tests at powerup. The red and green lights indicate theprogress of the tests. If a fault is found, the last LED stateindicates the last test that was successfully completed and thefault occurred in the next test in the list. Note that when all testshave successfully been completed, the green LED on the boardshould be lit. Contact Vilter should the board not complete thetests properly.



STATE OF LED’S AFTER TEST SEQUENCE TEST COMPLETION

Red LED Green LEDPower On ON ONPrior to start of tests OFF OFFTest 1 - Instruction set ON ONTest 2 - ROM checksum test ON OFFTest 3 - Internal RAM OFF OFFTest 4 - External RAM OFF ON


Pressures do not readthe same as a gaugeinstalled in a pressureline. Temperaturereadings are constantbut are in error.

a. Pressure readings on the microprocessor may not match apressure gauge reading exactly. One reason may be thedifference in location of where the readings are taken, for instanceif a gauge is located downstream of a solenoid and the pressuretransducer is sensing pressure upstream of the solenoid. Oncethe pressure transducer is calibrated at a known pressure, using aknown good gauge installed at the same location, the transducerreading should precisely match the gauge reading throughout itsrange of operation. Recalibration is accomplished through theRecalibrate Channel operator menu on the microprocessor.

b. Temperature reading errors are most likely caused by the lengthof wire which is run to the RTD. The wire can add significantresistance - 100 feet of annealed 20 gauge copper wire (at roomtemperature) typically has a resistance of 1 ohm. This amountedto a +4°F error. The lead wire resistance errors can easily becorrected by recalibrating the erroneous RTD channel(s) throughthe Recalibrate Channel operator menu on the microprocessor.



Noise can play a major role in introducing sporadic problems with microprocessor basedproducts. One source of noise can be a loose wire on a transducer. The wire can arc,placing a “spike” on the logic ground on the board. This can produce a variety of strangeresults. These include the following problems:


Random characters orstrange charactersbeing displayed onthe display.

a. Check for ground loops and noise problem sources (AC powerwires run next to transducer wiring or next to the display cable).

b. Check for loose DC ground wiring on transducers and LCDbacklight ground wiring. Loose wiring can cause arcing and noisebeing put on the logic ground of the Microprocessor.

Setpoints change. a. Check for ground loops and noise problem sources (AC powerwires run next to transducer wiring or next to the display cables).

b. Check for loose DC ground wiring on transducers and LCDbacklight ground wiring. Loose wiring can cause arcing and noisebeing put on the logic ground of the Microprocessor.

Microprocessorsporadically powersdown and powersback up (watchdogcircuitry has reset theboard).

a. Check for loose power wires.

b. Check for ground loops and noise problem sources (AC powerwires run next to transducer wiring or next to the display cables).

c. Check for loose DC ground wiring on transducers and LCDbacklight ground wiring. Loose wiring can cause arcing and noisebeing put on the logic ground of the Microprocessor.

Every time the poweris removed from thepanel, the setpointschange and revert to“default” values.

a. Replace battery backed RAM on board - located in socket U18.


VI. SPARE PARTS

The following is the recommended spare parts list for the Twin Screw CompressorMicroprocessor.

VILTER RECOMMENDEDDESCRIPTION PART QTY PER

NUMBER MICROPROCESSOR

RTD (Resistance TemperatureDetector)

2611B 1

Pressure Transducer 2783A 1Input Module 120 VAC 2895M 1Output Module 120 VAC 2895N 1Output Module Fuse 2895P 1Panel Fuse 10 AMP 1478D 1Panel Fuse 15 AMP 1478E 1Panel Fuse 20 AMP 1478Y 1Control Relay CR-1 & 2 1813A 1Control Relay CR-3 1813C 1Capacity Potentiometer 2935C &

KT6951



EPROM REPLACEMENT PROCEDURE

At some point, the program held in the EPROM chip may be updated or a requested change tothe program is made. These circumstances require that the EPROM must be replaced. It’s afairly straight forward process to change out. The procedure is:

1) Remove power from panel. (The selector switch on the front of panel labeled “CONTROLPOWER” does not remove power from the panel. Turn off circuit breaker feeding powerto panel to ensure that power is removed from the board.)

2) EPROM is located near center of board - U20. Note orientation of old EPROM and installnew one in same manner.

3) Reference Jumper Location data sheet. The EPROM is a 64K (27C512) EPROM. Locatethe correct jumper configuration diagram on the data sheet that comes with the EPROMand make sure the jumpers below the EPROM are set up this way.

4) Make sure all pins are inserted into the socket and then turn power back onto panel.

5) The instructions may state that a ‘COLD START’ procedure must be done. ReferenceT-Sheet T45031-2/2 in this manual for this procedure.

MICROPROCESSOR OPERATING MODE MESSAGES AND THEIR MEANING

TWIN SCREW COMPRESSOR

Version 3.xx, 4.xx (Version 3.xx does not support setpoint #2).

Failure, Alarm and Event List messages

Event List messages add either an “F” or an “A” behind the following messages to indicatea failure or an alarm respectively.

(Display) (Meaning)

SUCTION TEMP - Suction temperature

DISCHARGE TEMP - Discharge temperature

LO CONTROL °F - Low control temperature.

HI CONTROL °F - High control temperature.

LO OIL INJ °F - Low oil injection temperature

HI OIL INJ °F - High oil injection temperature

SUCTION PRESS - Suction pressure (ver. 3.xx).

SUCT PR SETPT1 - Suction pressure setpoint#1 (ver. 4.xx).

SUCT PR SETPT2 - Suction pressure setpoint #2 (ver.4.xx)

DISCHARGE PR - Discharge pressure (ver. 3.xx).

DSCH PR SETPT1 - Discharge pressure setpoint#1 (ver. 4.xx).

DSCH PR SETPT2 - Discharge pressure setpoint#2 (ver. 4.xx)

MANIFOLD PRESS - Manifold pressure transducer.

% CAPACITY - Percent capacity. If this message is seen, either thepotentiometer is out of calibration or the potentiometeris bad. See potentiometer recalibration procedure.

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MICROPROCESSOR OPERATING MODE MESSAGES AND THEIR MEANING (cont’d)

(Display) (Meaning)

RUN OIL PRESS - Run oil differential (Oil diff press = Manifold press -Discharge press). This failure could be due to anumber of reasons. Once the oil pump starts, twotimers start timing, the Pump Run Limit W/O Oil Presstimer and the Oil Pump Prelub Before Start timer. Thepump primes the oil lines for the Oil Pump PrelubBefore Start timer setting. The compressor will notstart until the Lo Run Oil Press reset pressure setpointis reached. If oil pressure is never established, thePump Run Limit W/O Oil Press timer will time out andthe compressor will fail on Run Oil Press failure. Afterthe compressor starts, an Oil Press Fail Delay Timerand the Oil Press Bypass Allow Timer are initiated.

After start, the compressor may experience momentarydips in oil pressure, perhaps due to cold oil orinadequate prelub time, for instance. The Oil PressFail Delay Timer allows the dips to extend up to its timesetting - typically 10 seconds. Extended low oilpressures beyond this timer setting will result in Lo RunOil Press failure. The low oil pressure dips are allowedfor the time setting of the Oil Press Bypass Allow Timersetting typically for the first 5 minutes of running. Afterthis time, any oil pressure that drops below the tripsetpoint of the Lo Run Oil Pressure setting, thecompressor will fail on Lo Run Oil Press.

START FLTR PR - Start filter differential pressures (Filter inlet press -Manifold press). If the filter differential pressure getsabove the Hi Start Fltr Diff Pr setpoint before the FilterDiff Press Change-over times out, the compressor willfail on Start Fltr Pr failure.

RUN FLTR PRESS - Run filter differential pressure (Filter inlet press - Manifoldpress). If the filter differential pressure gets above theHi Run Fltr Diff Pr setpoint after the Filter Diff PressChange-over times out, the compressor will fail on RunFltr Pr failure.

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MICROPROCESSOR OPERATING MODE MESSAGES AND THEIR MEANING (cont’d)

(Display) (Meaning)

LO SBX CH#1 °F - Low SBX expansion board channel #1 temperature.

HI SBX CH#1 °F - High SBX expansion board channel #1 temperature.







OIL INJ TEMP - Low oil injection temperature.

MOTOR OVERLOAD - Motor overload (failure only). Reference your wiringdiagram. Microprocessor sensed that the input modulethat has the compressor motor starter auxiliary contactwired to it has lost the 115 volts being supplied to it.Typically, this indicates the starter has failed on itsoverload relay.

AUX #1 SAFETY - Auxiliary #1 input (failure only). Reference your wiringdiagram. Microprocessor sensed that the input modulethat has an auxiliary safety wired to it has lost the 115volts supplied to it.

AUX #2 SAFETY - Auxiliary #2 input (failure only). Reference your wiringdiagram. Microprocessor sensed that the input modulethat has an auxiliary safety wired to it has lost the 115volts supplied to it.

FROZEN STARTER - (Version VRS 4.43 - 104 & later). In the event that thecompressor starter is told to turn off and the auxiliarycontact of the starter does not open up (indicating afrozen or welded starter situation), this message isdisplayed and the oil pump is forced on until theauxiliary contact is sensed to have opened.

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HVACR Technology and Infrastructure Solutions | Emerson US · 15 iia safety setpoint functions 19 iib control limit setpoint functions 27 iic setpoint timer functions 35 iid operator