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Digit al ValveSequence Programm erInstructio n Manual
MAN-DVSP
Rev. 1/93
Printed in USA
P. O. Box 55603, Houston, TX 77255(713) 688-9345 • Sales toll-free (800) 367-8424
Fax (713) 688-8106
Valco Instruments Co. Inc.
Table of Contents
1. GENERAL DESCRIPTION...............................................................................1
2. IMPLEMENTATION...........................................................................................22.1 Solenoid Valves 2.11 110 VAC 2.12 12 VDC 2.13 Valco MSVA 2.14 Pulsed Operation of Solenoids2.2 Valco Electric Actuators 2.21 Multiposition 2.22 Two position2.3 Valco Digital Valve Interface (DVI)
3. SWITCH AND DISPLAY FUNCTIONS ............................................................73.1 Operating the DVSP by Remote Contact Closure
4. DEMONSTRATION SEQUENCE .....................................................................8
5. TECHNICAL DRAWINGS...............................................................................11
6. WARRANTY....................................................................................................23
1. GENERAL DESCRIPTION
The Digital Valve Sequence Programmer (DVSP) is an add-on or stand-alonetimer/programmer available with either 2 or 4 intervals, settable in ranges of 0-99seconds, 0-9.9 minutes, or 0-99 minutes. The DVSP is most commonly used forremote operation of electrical devices such as solenoid valves, Valco two positionor multiposition electric actuators, and the Valco Digital Valve Interface (DVI), whichconverts contact closures into pneumatic pulses for switching Valco two position airactuators.
The DVSP has two operational modes: in the AUTO mode, the DVSP will return tothe first interval and begin another sequence after the last interval is completed,and in the SINGLE CYCLE mode it stops after one sequence. During a cycle orsequence, simple controls allow the user to stop the cycle, reset it to Interval 1,switch to the AUTO mode, or advance to the next interval. The DVSP can also bewired for remote operation by contact closure from a data system or other controldevice.
Each interval has one DPDT (double pole, double throw) relay, which provides twosets of contacts with no connection from one side to the other. This means that asingle interval can be used to perform two separate functions requiring differingvoltage requirements. For example, one side of relay A (Interval 1) can be used toswitch an electric actuator (contact closure) while the other side is connected to110 VAC and switches a 110 VAC solenoid valve at the same time as the electricactuator. In addition, Relay E (functional only in the AUTO mode) supplies a twosecond contact. When solenoid valves are wired in series with this relay the resultis "pulsed operation" of the air actuator, which avoids the potential valve and ac-tuator problems associated with continuously-applied air pressure.
Both 12 VDC and 110 VAC power supplies are included within the DVSP, but therelays may be supplied from any external power source. For example, 24 VDCsolenoid valves can be switched by the DVSP relays if the 24 volts is supplied tothe relays from an external 24 VDC power supply.
SPECIFICATIONSGeneral 3-wire power cord (2 meters) Externally accessible 2A fuse 95-130 VAC, 25-60 Hz 2 or 4 intervals; settable from 0 - 99 seconds, 0 - 0.9 minutes, or 0 - 99 minutes DPDT relay contacts rated at 3 amps @120 VAC resistive load Elapsed time display
Dimensions 30 cm (11.8") x 15 cm (6") x 6 cm (2.4") Weight: 2 Kgm (4 lbs)
Accuracy 2.16 seconds/day maximum error
Temperature range 0 - 70°CPower Consumption 110 VAC @ 50 mA 12 VDC @ 200 mA
1
2. IMPLEMENTATION
Before removing the top cover of the DVSP, make certain that the powercord is unplugged.
Remove the two screws on the upper rear panel which secure the top cover. Lookat Figure 1 to locate the two barrier terminal strips located near the center of thelarge printed circuit board. The terminals are grouped beside letters denoting re-lays A, B, C, and D, and are marked C for Common, NO for Normally Open, andNC for Normally Closed. For convenience, the power line (fused and switched) isconnected to two of the terminals on the DVSP mother board, labelled HOT andNEUT. HOT is the high side of the line and NEUT is the low side.
For operation of devices requiring line voltage (1 amp max), one side of the deviceis connected directly to the NEUT terminal and the HOT is switched by the outputrelays. For devices which operate on 12 VDC (300 mA max), voltage can besupplied to any of the relays with a simple jumper connection between the terminalmarked 12 and the Common terminal of the target relay. (Figure 2 ) Any externalpower source can be connected to a Common in the same manner, with a holeprovided in the rear panel to allow a passage for all the external wiring.
The DVSP output relays are double pole, double throw (DPDT), meaning that theyhave two separate sets of contacts with no connection from one set to the other.One contact of each set is the common (C), which is connected to the normallyclosed (NC) contact when the DVSP is not in the interval corresponding to thatrelay. As the DVSP enters each interval, the corresponding relay switches andconnects the common (C) terminal to the normally open (NO) terminal, sendingthe current to the external device.
TERMINAL STRIPS
HOTNEUT
TERMINALS FORADDITIONAL RELAY WITHTWO SECOND CONTACT
GRND+12
HOLE FOR WIRING
LOGICBOARD
PIN FOR RE-MOTE "RUN"
PIN FOR REMOTE "STOP"
PIN FORREMOTE"GROUND"
PIN FORREMOTE"+12"
Figure 1: View of DVSP with cover removed
2
The table below indicates which group of terminals applies to each interval for thevarious DVSP models. In the drawings which illustrate the different wiring options,the terminal groupings are chosen purely for convenience: there is no intent inthese drawings to convey any information about specific intervals.
DVSP-2 Interval 1 Relay A
Interval 2 Relay C
DVSP-4 Interval 1 Relay A
Interval 2 Relay B
Interval 3 Relay C
Interval 4 Relay D
2.1 Solenoid Valves
2.11 110 VAC
The steps described below are illustrated in Figure 2.
1. Supply 110 VAC by connecting the HOT terminal to C of the appropriaterelay.
2. Connect one wire of the solenoid to the NEUT terminal.
3. Connect the other wire of the solenoid to the normally open (NO) terminal ofthe relay which corresponds to the C of Step 1.
2.12 12 VDC
The steps described below areillustrated in Figure 2.
1. Supply 12 VDC by connectingthe +12 terminal to C of the ap-propriate relay.
2. Connect one wire of the sole-noid to the GRND terminal.
3. Connect the other wire of thesolenoid to the normally open(NO) terminal of the relay whichcorresponds to the C of Step 1.
12 VDC SOLE-NOID
110 VAC SOLE-NOID
Figure 2: 12 VDC and 110 VAC solenoids
3
2.13 Valco MSVA
The MSVA is used with a two position air actuator, which requiresone interval to switch to the inject position and another to switch tothe load position. The steps described below are illustrated inFigure 3 .
1. Supply the proper voltage (110 VAC in this example) byconnecting the HOT terminal to C of the one of the groups ofterminals to be used, and jumping it to C of the other.
2. Connect one wire of each solenoid to the NEUT terminal.
3. Connect the other wire of each solenoid to the NOs whichcorrespond to the Cs of Step 1, according to the desiredswitching sequence.
2.14 Pulsed Operation of Solenoids
The first three procedures demonstrate the simplest uses of the DVSP. Thisexample will illustrate the use of the pulsed relay in conjunction with two deviceson the same DPDT relay. The steps described below are illustrated in Figure 4.
1. Connect the two wires of the 12 VDCsolenoid as described in Section 2.12.
2. Connect one wire of the 110 VAC sole-noid to NEUT as described in Section2.11, but connect the other wire to thesecond NO terminal of the same relayto which the 12 VDC solenoid is con-nected.
3. Supply 12 VDC by connecting the +12terminal to one of the NO terminals onthe pulsed relay (Figure 1 ) andconnecting that NO’s related Commonto the Common of the NO which hasthe 12 VDC solenoid connected to it.
4. Likewise, supply 110 VAC by connectingthe HOT terminal to the remaining NOterminal on the pulsed relay andconnecting that NO’s related Commonto the Common of the NO which hasthe 110 VAC solenoid connected to it.
12 VDC SOLE-NOID
110 VAC SOLE-NOID
TERMINALS FOREXTRA RELAYWITH TWO SEC-OND PULSE
Figure 4: Use of the pulsed relay andtwo events on one relay
Figure 3: 110 VAC Valco MSVA
4
2.2 Valco Electric Actuators
Multiposition actuators require only one event to step the valve/actuator to its nextposition. However, the two position actuator requires two intervals: one to switchthe two position valve to its inject position and another to switch it to its loadposition.
2.21 Multiposition
The steps below are illustrated in Figure 5 .
1. Locate the two pairs of adjacent grey andwhite wires in the interface cable supplied withthe actuator. The relevant pair for this applica-tion is the one near the center of the ribboncable.
2. Connect the grey (STEP) wire to the NOterminal of the appropriate relay.
3. Connect the white (GRND) wire to C or thesame relay.
2.22 Two position
The steps below are illustrated in Figure 6 .
1. Locate the black, red, and green wires in theremote switching cable extending from thecover of the actuator.
2. Connect the black (INJECT) wire to the NOterminal of the appropriate relay for the de-sired interval.
3. Connect the red (LOAD) wire to the NOterminal of the relay corresponding to theinterval where sample is to be loaded.
4. Connect the green (GRND) wire to theCommon of one of the relays and use ajumper to connect it to the Common of theother relay.
GREY WIRE
Figure 5: Valco multiposition electric actuator
GREEN WIRE
BLACK WIRE
RED WIRE
WHITE WIRE
Figure 6: Valco two position electric actuator
5
2.3 Valco Digital Valve Interface (DVI)
Two intervals are required with the DVI: one to signal it tomove the valve to the inject position, and one to signal itto return to the load position. The steps described beloware illustrated in Figure 7 .
1. Connect the air actuator to the DVI as described inthe DVI literature.
2. Locate the blue, black, and red wires in the interfacecable supplied with the DVI.
3. Connect the blue (INJECT) wire to the NO terminalof the appropriate relay for the desired interval.
4. Connect the black (LOAD) wire to the NO terminalof the relay corresponding to the interval wheresample is to be loaded.
5. Connect the red (GRND) wire to the Common ofone of the NOs used in Steps 3 and 4, and use ajumper to connect it to the Common of the otherNO.
In routine operation the DVSP will control theswitching of the valves, so manual control throughthe DVI will not be an issue. However, it is possibleto allow the option of manually overriding the posi-tioning of valves switched by the DVI. To do this, theDVSP signal must be removed from the DVI remotecable by routing the DVI common (RED) through thepulsed relay, E. The signal from the DVSP is ap-plied for only two seconds and then removed, per-mitting subsequent manual valve positioning withthe switch on the front of the DVI.
DIGITAL VALVEINTERFACE
BLUE WIRE
RED WIRE
BLACK WIRE
Figure 7: Valco Digital Valve Interface
6
3. SWITCH AND DISPLAY FUNCTIONS
1. Power ON/OFF : Turns the DVSP on and off.
2. Interval duration switches: Each interval has two thumbwheel switches forsetting the the interval duration, in increments determined by the setting ofthe time unit switches.
3. Time unit switches: Under each pair of interval duration switches is athree-position switch which defines the units in which the duration is set.With this switch to the left the unit is minutes, so the two digits of the dura-tion switches reflect a value from 00 to 99 minutes. In the middle positionthe unit is tenths of a minute, with a range of 0.0 to 9.9 minutes. (In thissetting the elapsed time display shows a decimal point.) When the switch isto the right the thumbwheel duration switches are setting seconds, in arange from 00 to 99.
4. ADVance button: This will advance the DVSP into the next non-zero inter-val. Everything functions as if the timer had reached its setting and ad-vanced to the next interval on its own.
5. AUTO button: Pushing this button toggles the DVSP in and out of the AUTOmode. In the AUTO mode (AUTO LED on), when a cycle is completed theDVSP goes back to the first interval and starts another. In the SINGLECYCLE mode (AUTO LED off), the timer stops at the end of the last interval.
6. ReSeT button: Pressing this button sets the DVSP to the state it’s in whenfirst turned on: the timer is stopped and the DVSP is in the SINGLE CYCLEmode. No interval is being addressed and no relays are energized.
7. RUN button: Pressing this button lights the RUN LED, starts the timer, andmoves the DVSP to the first interval not set to "00".
8. STOP button: This stops the timer and resets it to zero, but the DVSPremains in the interval that was in progress and the output to the relaysstays the same. The RUN LED goes off.
9. Current interval lights: Between each time unit switch and interval numberis an LED which comes on when that interval is current.
10. Elapsed time readout: This digital display to the left of the VICI logo showsthe elapsed time in the interval which is running, indicated by which currentinterval light is on. The display is in the value range selected by the threeposition time unit switch for that interval. Whenever the timer is countingminutes, the decimal light flashes at one second intervals.
3.1 Operating the DVSP by Remote Contact Closure
The DVSP can be wired so that the functions done by RUN, STOP, and AUTObuttons can be done by remote contact closure. This involves soldering wires fromthe control device to the appropriate pins on the logic board. (Figure 1 ) For theRUN function, establish momentary contact between pins 18 and 35 (+12). Forthe STOP function, momentarily connect pins 17 and 35. Connecting pin 22 to pin34 (ground) will toggle the DVSP in and out of the AUTO mode.
7
4. DEMONSTRATION SEQUENCE
This example demonstrates use of the DVSP-4 to control the positioning of twoValco switching valves. Valve 1 (V1) is used for sample injection and Valve 2 (V2)is configured for column backflushing. Both valves are air actuated, but V1 iscontrolled by a Valco Digital Valve Interface (DVI) while V2 is controlled by a pair of3-way solenoid valves (MSVA). Each valve requires two intervals of the DVSP;one for clockwise rotation and one for counterclockwise. (All references to direc-tions are as seen from the actuator end of the valve.)
In the ready (rest) state, both valves are in the counterclockwise position. (Figure8) After the process is begun by charging the sample to V1, V1 will be switchedclockwise to inject the sample. (Figure 9 ) After two seconds for sample injection,V1 is returned to the counterclockwise position to load the next sample. In thisexample, fifteen minutes will elapse before V2 is switched clockwise and thecontents of the column are backflushed to the detector. (Figure 10 ) After nineteenminutes for desorbtion of the column contents into the detector, V2 is switchedcounterclockwise for the next sample analysis. Four and a half minutes will beallowed for equilibration before the next cycle begins.
Broken down into its component intervals, the process appears like this:
Interval 1 (2 seconds)Relay A is energized, switching V1 to its clockwise position and injecting thesample onto the column.
Interval 2 (15 minutes)Relay B is energized, switching V1 back to the counterclockwise position,ready for the next sample.
Interval 3 (19 minutes)Relay C is energized for two seconds (through relay E), switching V2 andbackflushing the column to the detector.
Interval 4 (4.5 minutes)Relay D is energized for two seconds (through relay E), switching V2 to thecolumn forward position, ready for the next run. If the DVSP is in the AUTOmode, the next cycle will begin after 4.5 minutes.
SAMPLE OUT
SAMPLE IN
CARRIER IN
TO DETECTOR
COLUMN
V2
Figure 8: V1 and V2in counterclockwise
position(Rest and Intervals 2, 4)
Figure 9: V1 inclockwiseposition
(Interval 1)
Figure 10: V2 inclockwiseposition
(Interval 3)
8
Programming the DVSP is very simple now that the process has been broken intosteps:
1. Set the switch beside the "1" to the right, for "seconds", and set thethumbwheel switch to 02.
2. Set the switch beside the "2" to the left, for "minutes", and set thethumbwheel switch to 15.
3. Set the switch beside the "3" to the left, for "minutes", and set thethumbwheel switch to 19.
4. Set the switch beside the "4" in the middle, for "tenths of minutes", and setthe thumbwheel switch to 45 (4.5 minutes).
The wiring connections for the demonstration sequence are illustrated in Figure12. Since V1 uses the DVI (with a built-in two-second relay) it is simply wired toDVSP relays A and B which correspond to Intervals 1 and 2. (A jumper connectsthe Commons.)
Since V2 is switched by a pair of solenoid valves, it is important that the currentwhich activates them is supplied only as long as it takes to switch the valve, eventhough the DVSP relay is energized for the entire length of the interval. To providethis pulsed current and avoid the problems associated with continuously-applied airpressure, the DVSP features a fifth relay (E) which is activated for two seconds atthe beginning of each interval. When the "hot" leg of each solenoid is run throughrelay E, the power is applied to the solenoid only during the initial two seconds ofits interval.
AUTO RUNm x .1m x .1m x .1m x .1
m s m s m s m s
POWER
4321Valco Instruments Co. Inc.
Figure 11: DVSP front panelprogrammed for the demonstration process
9
INTERVAL 4
INTERVAL 3
INTERVAL 2
INTERVAL 1
AIR IN
AIR IN
BLACK WIRE
BLUE WIRE
RED WIRE
34
12
VALVE 1 VALVE 2
TERMINALS FOR RELAY "E"WITH TWO SECOND PULSE
Figure 12: DVSP connections for thedemonstration process
10
5. TECHNICAL DRAWINGS
Digital Valve Sequence Programmer Assy .................. Drawing 21143 Page 12
Mother Board Assy, Four Interval DSVP ..................... Drawing 21027 Page 13
Schematic - DVSP Mother Board ................................ Drawing 21212 Page 14
Logic Board Assy ......................................................... Drawing 21061 Page 15
Schematic - Logic Board.............................................. Drawing 21030 Page 16
Digiswitch Interface Board Assy................................... Drawing 21088 Page 17
Schematic - Digiswitch Interface Board Assy .............. Drawing 21188 Page 18
Pushbutton Board Assy................................................ Drawing 21059 Page 19
Schematic - Push Button Board Assy.......................... Drawing 21062 Page 20
TWS Board Assy, Four Interval DVSP......................... Drawing 21023 Page 21
Schematic - TWS Board Assy, Four Interval DVSP..... Drawing 21294 Page 22
11
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22
6. WARRANTY
This Limited Warranty gives the Buyer specific legal rights, and a Buyer may alsohave other rights that vary from state to state.
For a period of 365 calendar days from the date of shipment, Valco InstrumentsCompany, Inc. (hereinafter Seller) warrants the goods to be free from defect inmaterial and workmanship to the original purchaser. During the warranty period,Seller agrees to repair or replace defective and/or nonconforming goods or partswithout charge for material or labor, or, at the Seller’s option, demand return of thegoods and tender repayment of the price. Buyer’s exclusive remedy is repair orreplacement of defective and nonconforming goods, or, at Seller’s option, the re-payment of the price.
SELLER EXCLUDES AND DISCLAIMS ANY LIABILITY FOR LOST PROFITS,PERSONAL INJURY, INTERRUPTION OF SERVICE, OR FOR CONSEQUEN-TIAL INCIDENTAL OR SPECIAL DAMAGES ARISING OUT OF, RESULTINGFROM, OR RELATING IN ANY MANNER TO THESE GOODS.
This Limited Warranty does not cover defects, damage, or nonconformity resultingfrom abuse, misuse, neglect, lack of reasonable care, modification, or theattachment of improper devices to the goods. This Limited Warranty does notcover expendable items. This warranty is VOID when repairs are performed by anonauthorized service center or representative. For information about authorizedservice centers or representatives, call or write Customer Repairs, ValcoInstruments Company, Inc, P.O. Box 55603, Houston, Texas 77255. ph(713) 688-9345 At Seller’s option, repairs or replacements will be made on site or at thefactory. If repairs or replacements are to be made at the factory, Buyer shall returnthe goods prepaid and bear all the risks of loss until delivered to the factory. IfSeller returns the goods, they will be delivered prepaid and Seller will bear all risksof loss until delivery to Buyer. Buyer and Seller agree that this Limited Warrantyshall be governed by and construed in accordance with the laws of the State ofTexas.
THE WARRANTIES CONTAINED IN THIS AGREEMENT ARE IN LIEU OF ALLOTHER WARRANTIES EXPRESSED OR IMPLIED, INCLUDING THE WARRAN-TIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
This Limited Warranty supercedes all prior proposals or representations oral orwritten and constitutes the entire understanding regarding the warranties made bySeller to Buyer. This Limited Warranty may not be expanded or modified except inwriting signed by the parties hereto.
23
