Eriez Metal Detectors

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Installation, Operationand MaintenanceInstructions

ERIEZ MAGNETICS HEADQUARTERS: 2200 ASBURY ROAD, P.O. BOX 10608, ERIE, PA 165140608 U.S.A.WORLD AUTHORITY IN ADVANCED TECHNOLOGY FOR MAGNETIC, VIBRATORY and METAL DETECTION APPLICATIONS

MM-19

E-Z Tec

DSP Metal

Detectors


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Introduction

This manual details the proper steps for installation, operation andmaintenance of the Eriez E-Z TecDSP Metal Detectors. Careful

attention to these requirements will assure the most efficient anddependable performance of this equipment.

If there are any questions or comments about this manual or theE-Z Tec DSP Metal Detector, please contact the factory for

assistance at (814) 835-6000 or www.eriez.com.

2003 ERIEZ MAGNETICS ALL RIGHTS RESERVED

CAUTION - ELECTROMAGNETIC FIELDS

Metal Detectors emit electromagnetic fields. Contact the AmericanConference of Governmental Industrial Hygenists, Cincinnati, Ohio,U.S.A., (www.acgih.org) for additional information.

If you use a medical implant or similar device, you must never approach

the equipment because your device may malfunction in theelectromagnetic field, with consequences up to and including death.

Contact Eriez if you have a question regarding these precautions.

CAUTION

Safety labels must be affixed to this product. Should the safety label(s)be damaged, dislodged or removed, contact Eriez for replacement.


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Handling InstructionsPLEASE LEAVE THESE INSTRUCTIONS ATTACHED

TO THE EQUIPMENT UNTIL INSTALLATION IS COMPLETE

1. DO NOT LIFT THE METAL DETECTOR BYINSERTING ANYTHING INTO OR THROUGH

THE APERTURE. The inner surface of theaperture is delicate and protects the preciselytuned electronic circuit and internal parts. Theintegrity of this liner and seal must be main-

tained. Any damage to this surface or any ap-erture distortion caused by handling will invali-date Eriez warranty. This aperture liner alsoprotects the internal parts against water dam-

age. The seal must be maintained.

2. HANDLE THE SHIPPING PALLET, NOT THEDETECTOR. Keep the metal detector on its

shipping pallet as long as possible.

3. When removing the detector from the shippingpallet, LIFT ONLY ON THE DETECTOR

HOUSING SURFACES, SUPPORTINGFEET OR TAPPED LUGS.

4. IF POSSIBLE, LIFT BY HAND, or by using acrane and soft nylon slings running under the

entire detector housing NOT THROUGH THEAPERTURE. Block the slings to prevent rub-

bing on the remainder of the detector housing.

5. The metal detector is heavy. Use care whhandling to avoid injury to personnel or da

age to property.

6. Never weld any attachment to the detechousing. Do not attempt to drill and/or tap tmetal detector housing for lifting or mounti

attachments.

7. Never lift with a crane or forklift under the cotrol housing that protrudes from the body

the metal detector. Make certain that liftistraps and other handling equipment do n

contact the control housing.

8. If handling with eyebolts use only the pr

tapped holes. Make sure that eyebolts astrong enough for the loads that will be aplied. Never apply loads perpendicular to t

shank of the eyebolts; they will break.


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Table of Contents

PRINCIPLE OF OPERATION ............................................................................... 6

SPECIFICATIONS ................................................................................................ 8

INSTALLATION CAUTION!! .................................................................................. 9

MECHANICAL INSTALLATION.............................................................................9

Introduction .....................................................................................................9

Handling ........................................................................................................10

Location of Sensing Head .............................................................................10

Metal Free Area ............................................................................................. 10

Electrical Current Loops ................................................................................ 11

Insulating the Conveyor Shafts ..................................................................... 12

Permanent Current Loops .............................................................................13

Supporting Structure .....................................................................................14

Belt and Belt Splices .....................................................................................15

Conveyor Slider Bed .....................................................................................16

Product Position ............................................................................................ 16

Reject Proximity Switch ................................................................................. 16

ELECTRICAL INSTALLATION ............................................................................17Introduction ...................................................................................................17

Choice of Input Power Source ...................................................................... 17

Relays ........................................................................................................... 17

Tachometer Input ..........................................................................................18

Proximity Switch ............................................................................................ 18

Reject Confirmation (Rej Con) ...................................................................... 18

Reject Reset (Rej Reset) .............................................................................. 19

Remote Computer Port ................................................................................. 19

Conduit .......................................................................................................... 19

Power Switch ................................................................................................19

ERIEZ E-Z TEC DSP METAL DETECTORS


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Table of Contents (cont.)OPERATION ....................................................................................................... 23

Initial Start-up ................................................................................................23

Operator Interface .........................................................................................25

Menu Structure .............................................................................................. 25

Password Menu ............................................................................................ 25

Quick Menu ...................................................................................................26

Report Menu .................................................................................................27

Fault Menu ....................................................................................................27

Clock Setup ...................................................................................................27

Calibration Setup ........................................................................................... 27

Password Setup ............................................................................................ 27

Diagnostic Menu ........................................................................................... 28

Machine Menu ...............................................................................................28

Product Setup ...............................................................................................28

Operating Procedure .....................................................................................33

Boot-up Menu................................................................................................33

Monitor Menu ................................................................................................33

Set Time and Date ........................................................................................35

Set Date ........................................................................................................35

Initial System Configuration ..........................................................................35Verify Detection ............................................................................................. 38

Additional Functions ......................................................................................39

MAINTENANCE ..................................................................................................40

TROUBLESHOOTING ........................................................................................41

SPARE PARTS....................................................................................................43

APPENDIX .......................................................................................................... 44


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Principle of OperationThe E-Z Tec DSP Metal Detector uses a balanced-coil system to detect various types of metalliccontamination such as mild steel, non-ferrous metals

and stainless steel. The E-Z Tec DSP Metal Detectoruses a three-coil detection system (Figure 1). Thesignal voltage in the primary coil is driven by an

oscillator. Two secondary coils, on a common axiswith the primary, are coupled into the field of theprimary coil in such a manner that the system is inbalance and the induced voltages in the two

secondary coils cancel.

Material to be screened for metal creates a distortionin the electromagnetic field as it passes through thedetector aperture. This distortion results in a

difference in the induced voltages in the twosecondary coils. The voltage difference is amplified,digitized, and filtered to extract detection information

that is used to decide whether the signal representsmetal or the users product. If the signal representsthe users product, it is ignored. If it represents metalthat exceeds a pre-set sensitivity level, the detector

generates a detection signal that initiates reject and/or alarm actions. Figure 2 shows a typical installationof an E-Z Tec Metal Detector.

Figure 1. Principle of Operation


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Figure 2. Typical E-Z Tec DSP Metal Detector Installation


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SpecificationsSUPPLY VOLTAGEAutomatically adapts to line voltage from 100 to 250VAC at 50 to 60 Hz. The maximum allowable surge

voltage is 150 Vrms at 110 V nominal or 300 Vrms at220 V nominal for 2 seconds. A dedicated line to themain power bus, containing a reliable ground for

connection to the GND in the detector or systemjunction box, is required for optimum performance.

MAXIMUM DEMAND60 VA, not including any connected loads. The

maximum connected external load is 5 amperes.

OPERATING AMBIENT TEMPERATURE-10C (14F) to 45C (113F)

STORAGE TEMPERATURE-10C (14F) to 80C (175F)

RELATIVE HUMIDITY0 to 95%

ENCLOSUREThe standard enclosure is rated NEMA 4X / IP66and will withstand normal wash-down procedures.Unless specified upon order placement, the unit isnot warranted against damage caused by high-pressure spray directed at the control panel. Consult

the factory for an optional protective cover if caustic

wash-down solutions or high pressure wash-downare used.

PRODUCT VELOCITY2 ft/min (0.6 m/min) to 7800 ft/min (2400 m/min),dependent on aperture size.

OUTPUTSTwo reject relays: (1) two form C contacts; (2) oneform C contact. Rated 5 amps up to 250 VAC or 30

VDC.One fault relay with one form C contact rated 5amperes up to 250 VA or 30 VDC.

Two 5 ampere fused outputs at the detectors supplyvoltage.

One 0.5 ampere 12/24 VDC output jumper

selectable.

TIMERProgrammable travel time and reject time 0 to 60seconds.

TACHOMETER INPUTVoltageLogic 0 - 0.0 to 0.9 VDC

Logic 1 - 3.15 to 50 VDC(NPN Opened Collector can also be used)

CurrentSource N/ASink 1.0 mA minimum

Frequency - 50 Hz maximum

Minimum Pulse Width - Logic 0 and Logic 1 is 5 msec


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E-Z TecDSP Metal Detectors are manufactured tovery stringent quality standards to ensure that theywill provide years of trouble-free service. To achieve

this trouble-free service, the installer must follow theinstallation procedures outlined in this manual. Thedetails of the procedures are important, and must

be followed precisely for proper metal detector

operation.

Metal detectors are extremely sensitive to very smallchanges in the electrical and physical environment.

Unstable operation is possible unless installed

correctly. Metal detectors are sensitive to vibratioand may false trip (generate a false reject signwhen the conveyor starts and stops. These problem

can be prevented by proper installation techniquePlease read all instructions prior to using the medetector. Problems caused by improper installatio

techniques are not covered by warranty. Timinvested on the up-front installation process will worthwhile and provide a trouble-free startup acontinued reliable service.

Installation Caution!!

Mechanical InstallationINTRODUCTIONThe metal detector contains several componentswhich must be physically mounted to a conveyor

or suitable stand: 1) the sensing head, 2) the control(if remote), and 3) other devices such as thetachometer, alarm horns, etc. Most E-Z Tec MetalDetectors have an integral sensing head and

control, thus simplifying installation and wiring (seeFigure 3).

The sensing head contains the coils and main

electronics. The head must be installed so theproducts being examined can pass through theaperture in a consistent and controllable manner. Itis vital that the sensing head be protected from

excessive vibration, physical abuse, electromagneticinterference, static electricity, and corrosive materials.The conveyor belt, chute or other product

conveyance device must not contact the metaldetector aperture.

In remote mounting situations, the control enclosuremust be mounted to a convenient surface, with

minimal vibration, that is easily accessible foradjustment. The control enclosure is fitted with plasticmounting feet that must be used for remote mounting

situations.

Figure 3. E-Z Tec DSP Metal Detector withIntegral Sensing Head and Control


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HANDLINGThe metal detector must be handled with care duringinstallation. Follow the specific handling guidelines

attached to the detector and included at the front ofthis manual.

LOCATION OF SENSING HEADThe location of the metal detector sensing head isextremely important. When selecting a location,consider the surrounding processing equipment,

product velocity, and rejection of contaminants.Operator convenience should also be evaluated. Becertain to read and understand all installationguidelines before the final location is selected. If there

are any questions please contact Eriez for

assistance.

METAL FREE AREAThe metal detector monitors an electromagnetic fieldto detect metal. This field is predominantly contained

within the aperture of the detector. However, some

Mechanical Installation (cont.)

Figure 4. Metal Free Area

fringing of the field exists at the inlet and outlet of theopening. The fringing field causes the metal detectorto be affected by metal in the vicinity of the aperture.

Metal that is not part of the product stream must notbe located in this area. The required metal-free areadepends on the size of the smaller dimension of the

aperture. Normally, 1.5 times the smaller aperturedimension is sufficient clearance for non-movingmetal. If space allows, a 1.75 multiplier on the smalleraperture dimension should be used. If there is relative

movement between the sensing head and adjacentmetal or the metal is a rotating cylinder, use a 2.0multiplier. (For example, stationary metal should notbe located closer than 6 to 7 inches (150 to 175 mm)

from either the inlet or outlet of a metal detector with

a 4x8-inch aperture. Moving metal should not becloser than 8 inches (200mm) from the entrance or

exit of such a detector. Refer to Figure 4 for details.Large metallic devices rotating or moving across thebelt should be tested to determine the necessarymetal free distance.


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ELECTRICAL CURRENT LOOPSThe most frequent problem encountered in metaldetector installations is false tripping caused by

unsteady electrical current loops. The fringing field(described in the previous section) dissipates instrength with distance to a point that metal outsidethe metal-free area will not cause false detections.Since the field is time varying, it will generate small

electrical currents in conductive paths (i.e.,metalwork) quite some distance from the aperture,even beyond the nominal metal free area. Thesecurrents, and ground currents from other nearby

equipment, will not cause false detection as long asthey are constant. If the current is disrupted,however, the resulting electromagnetic disturbance

may cause the metal detector to false trip.

The schematic diagram shown in Figure 5 provida simplified view of a typical metal detector aconveyor. The arrows represent electrical curren

As the bearings supporting the pulleys and idlers tuthey make and break contact with their respectiraces. Likewise the cross-members of the convey

framework represent possible break points. Ovtime, these connections can work loose or corrodand may make and break the electrical connectiodue to vibration. The interruption or change, of th

current is a source of electromagnetic interferendetectable by the metal detector.


Figure 5. Conveyor (Overhead View) Showing Ground Current Paths


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INSULATING THE CONVEYORSHAFTSA continuous electrical path through pulleys and idlers

cannot be assured. As a result, current changes cannot be prevented in these components. They mustbe electrically isolated from the remainder of the

system by introducing an insulating medium into theconductive path. Figure 6 shows two commonmethods of accomplishing this task.

The method shown in Figure 6-A requires machining

the end of the shaft to a smaller diameter to allowspace for a nylon plastic sleeve. The outside diameterof the sleeve is the same as the inside diameter of

the bearing. This sleeve breaks the electrical

connection between the bearing and the shaft, thuspermanently preventing current flow. WARNING: Donot cut through the sleeve when tightening the

bearing set screw.

Figure 6-B shows a method of insulating the completebearing block from the conveyor frame. This requiresdrilling the bolt holes through the bearing block to adiameter large enough to accept an insulating

shoulder washer. The shoulder washer wall thicknessshould be at least 1/32" (1 mm). The bearing blockshould also be insulated from the conveyor frame

with UHMW insulators extending across the base ofthe block.

Both of the insulating methods are reliable. However,

it takes only a small metal shaving or burr to cutthrough and short-circuit the insulators. For thisreason, check the integrity of the insulation with anohmmeter. Insulating either end of the shaft will

prevent current loops. However, leaving one end un-insulated will prevent testing with an ohmmeter. Forthis reason insulating both ends is recommended.

Build-up of a static electric charge on the conveyor

belt can also cause false tripping. A static chargecan build up on pulleys or idlers that are insulatedon both ends. To prevent false tripping, the insulation

must be modified to ensure a ground. After theintegrity of the insulators is checked with anohmmeter, one end of each shaft should be

electrically reconnected to the conveyor frame. If thesleeve insulating method has been used, thesetscrew of one of the bearings should be extended


Figure 6. Insulating Pulleys and Bearings


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Mechanical Installation (cont.)to make contact with the shaft. This may requiredrilling a small hole through the sleeve and insertinga sharp, pointed setscrew. If the bearing block

insulating technique has been used, simply removeone of the shoulder washers on one end of the shaft.Using either method, the integrity of the insulators

can be easily rechecked.

NOTES:If a drive pulley is powered by a metal chain, it is notnecessary to remove the insulators on either end of

the shaft as described above. The metal drive chainwill bleed off any static charge that may accumulateon the pulley.

If a non-metallic conveyor belt is used, insulate the

conveyor pulley on the side opposite the drive motor.

PERMANENT CURRENT LOOPSPermanent conduction paths (such as cromembers) in the conveyor frame should be weld

securely to provide a reliable path for any currenthat may be created. Bolted construction maeventually degrade, and is not recommended unledesigned and executed by experts in metal detectconveyor construction. Any conduction path that

to remain removable or that cannot be welded permanently bolted must be insulated from tconveyor frame.

Figure 7 shows a conveyor frame properly modififor a metal detector installation. Note that possibbreaks in the current paths no longer exist, and t

only currents in the conveyor frame are runnithrough a welded, permanent connection. Thecurrents will be constant and therefore will not caufalse detections.

Figure 7. Conveyor Support Frame Showing Typical Current Paths


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Mechanical Installation (cont.)SUPPORTING STRUCTUREThe structure that supports the metal detectorsensing head must be strong, rigid, and as free as

possible from vibration. Electronically, the metaldetector can be configured to be relatively insensitiveto vibration. Better sensitivity can be obtained bypreventing mechanical vibration from reaching thedetector head.

Four insulating mounting feet are supplied with themetal detector. These mounting feet must be usedto ensure proper operation (refer to Figure 8).All

four mounting feet must sit flat on the supportingstructure. Do not draw the feet down to the structure

by tightening the mounting bolts. This will put unevenstresses on the sensing head shell which may causeinstabilities in operation. If the mounting feet do not

rest flat on the supporting structure, shim withappropriate washers. All four mounting feet must besupported equally.

NOTE:Only the insulating mounting feet and electricalconnections should contact the sensing head.Conduit attached to the metal detector sensing head

should utilize plastic fittings (refer to ElectricalInstallation).

Figure 8. Use of Detector Mounting Feet


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Mechanical Installation (cont.)BELTS AND BELT SPLICESThe metal detector-sensing head cannot bedisassembled to be fitted around the conveyor belt.

For this reason the conveyor must be designed toreturn the belt through the aperture, or the belt mustbe cut and spliced back together. Splicing the beltwith lacing or clamps is not recommended sinceforeign materials tend to collect at the joint and may

eventually cause false detections.

A proven, trouble-free choice for metal detectorconveyor belts is modular plastic conveyor belts.

Conductive plastic components, belts, and metallichinge pins or rods must be avoided. Vulcanized beltsplices are most reliable and are recommended for

continuous belt applications (Refer to Figure 9). Ifthe belt is single-ply, the finger splice configurationshould be used. If the belt is multi-ply, a combinationof the step and finger splice configuration isrecommended.

Cold bonding is a popular and acceptable on-spractice. In this case, the splice is usually a bevelor step-lap type. In either case, the splices shou

be diagonal rather than straight across the beAlthough the cold-bond, diagonal splice is adequafor many applications, the vulcanized finger splice

preferred.

NOTE:During all splicing it is absolutely necessary to ensuthat no foreign material (especially metal) is trapp

within the splice. If metal is trapped in the splice, tdetector will trip each time the splice passes througthe aperture. Since the metal is trapped inside th

splice, it cannot normally be located and remove

without ruining the belt.

Figure 9. Conveyor Belt Splices


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CONVEYOR SLIDER BEDThe conveyor belt must be supported as it travelsthrough the metal detector. This is accomplished by

providing a stationary slider bed, which must becapable of holding the belt off the aperture liner evenwhen fully loaded. The slider bed must not touch theaperture liner.

The slider bed should be made of static-resistant

non-metallic material. Wood and phenolic are goodchoices. Most solid plastics cannot be used becausethese materials tend to generate static electricity

as the conveyor belt slides across. Static-resistantplastics that incorporate metallic particles cannotbe used.

PRODUCT POSITIONThe product should always be guided through thecenter of the aperture, both vertically and horizontally.

The product must be centered regardless of themethod of conveyance through the metal detector(i.e., conveyor, chute, or vertical pipe application). Ifthe same metal detector will be used to inspect

Mechanical Installation (cont.)multiple products with differing sizes, design thesystem to center the largest product in the aperture.In such a case be aware that the sensitivity of the

detector to metal of a particular size and type mayvary with the product position, and may requiredifferent detector settings for the different product

sizes and positions in the aperture.

REJECT PROXIMITY SWITCHA proximity switch indicates when a package isaligned with a reject device. For example, a productin a box may need to align with a reject device, such

as a pusher arm. To be rejected reliably, the proximityswitch indicates when the alignment is achieved. Thenormal position for the proximity switch is just after

the reject device so that it trips as the product alignswith the reject device. If it is difficult to install a switchin that location, install upstream from the rejectdevice. In this case the metal detector incorporatesa timer capable of delaying the output until the

product aligns with the reject device. Be certain notto infringe on required detector metal-free areawhen choosing the location of the proximity switch.


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INTRODUCTIONAll electrical connections are made within the NEMA-4X (IP-66)enclosure. This enclosure is attached to

the metal detector housing, except for remoteapplications. Figures 10 and 10A show the enclosureand the electrical connections to the circuit board.For convenience, connections are pull-apart terminalblocks. The pull-apart feature allows the connections

to be made outside the enclosure and then snappedback in place. See drawing Figure 10B for typicalwiring diagrams for reject devices.

CHOICE OF INPUT POWER SOURCEThe metal detector is equipped with filtering devices

to reduce incoming electrical noise. Inductive loads

sharing the same power circuit usually create noise.Even with filters, there is a limit to what the metaldetector can withstand without false tripping.

The best insurance against electrical noise is to runa separate circuit to the metal detector from the mainpower bus. This circuit should be free of all loadsexcept the metal detector. The power line should berun in its own metal conduit. If this is impractical,reliable operation can often be obtained by powering

the metal detector from a clean lighting orinstrument circuit. This circuit must be free of

inductive loads such as motors, solenoids, motorstarters, etc. If the metal detector must be powered

by a less favorable source, a harmonic neutralizedconstant voltage transformer can be used to reducefalse tripping from line noise. This transformer shouldbe mounted within 3-5 feet of the detector.

The power source is connected to terminals L1 andL2. Note that L1 and L2 are connected through fusesand circuit board traces to other terminals on the

circuit board as labeled. These terminals are intendedto be conveniently available to the user to power

various auxiliary equipment. The fuses have limitedcapacity as indicated in the specifications. If a piece

of auxiliary equipment requires a power in excess ofthe fuse capacity, the auxiliary equipment must bepowered from a separate source.

The metal detector power source must contain areliable ground. It must be connected to the GNDterminal of the metal detector. The metal detector

Electrical Installationshould be grounded at only one point - through tpower supply ground wire. No other grounconnections are permitted. This includes mounti

hardware and conduit.A circuit breaker/on-off switch protects the metdetector electronics. Fuses (5A/250 V) are locat

between the circuit breaker and input terminals protect power output terminals 7, 9, 16, and 18.

WARNING:L1 Fused and L2 Fused are not disconnected bthe internal circuit breaker. Disconnect incominpower before servicing. Failure to follow thprecaution may result in serious injury or deat

RELAYSThe E-Z Tec DSP Metal Detector provides thrrelays as follows:

1. Relay K1 -has two sets of form C contac(1A and 1B). Either or both sets may be co

nected as normally open or normally closeRelay K1s current is limited to a 5A at 250 VAor 30 VDC. The relay timing is controlled by t

reject settings in the metal detector. (ProducReject Menu).

2. Relay K3 -has a single set of form C cotacts. The output terminals may be connect

as normally open or normally closed. Relay K3output current is limited to a 5A at 250 VAC 30 VDC. The action of Relay K3 is instantaneo

upon metal detection.

3. Fault Relay K2 - has a single set of form contacts. The terminals may be connected normally open or normally closed. The fault r

lay output current is limited to a 5A at 250 VAor 30 VDC. This relay is activated by self-dtection of a fault within the metal detector, a

may be used to notify the operator or contrthe production line in such a case.

All of the relays are normally energized to provifail-safe operation. If a fault in the system occur

the relay changes to the de-energized state. Aftthe fault is cleared, the relay must be reset.


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RELAY NOTESIf switched power is needed for an external device inexcess of the 5 amperes maximum current, it must

be supplied to the appropriate device from an externalsource using an auxiliary relay or solenoid. Thevoltage and ampere ratings for all detection alarms,

reject devices etc. switched by the relays should notexceed the relay ratings.

TACHOMETER INPUT (TACH)Applications having variable speed product flow andrequiring automatic reject timing use this input. A

tachometer is used to allow the metal detector controlto monitor product speed and reject according to thedistance the product has traveled rather than

according to elapsed time since detection.

The electrical specifications are as follows:

VoltageLogic 0 0 to 0.9 VDC

Logic 1 - 3.15 to 50 VDC(NPN Open Collector can also be used)

CurrentSource N/A.Sink 1 mA min.

Frequency50 Hz max

Minimum Pulse WidthLogic 0 - 5 mSec.Logic 1 - 5 mSec.

PROXIMITY SWITCHThe metal detector can also be used to scan and

automatically reject packages. In this application, aproximity switch is used to sense the location of thepackage so it can be reliably rejected. The device

can be a mechanical switch, photo-eye, or any other

device that is capable of precisely locating thepackage. The electrical specifications are as follows:

VoltageLogic 0 - 0 to 0.9 VDCLogic 1 - 3.15 to 50 VDC.(NPN Open Collector can also be used)


Frequency50 Hz max.

Minimum Pulse WidthLogic 0 - 5 mSec.Logic 1 - 5 mSec.

NOTE:The right terminal (number 25 COM) of this input isground. Since the metal detector is grounded onlyby the input power supply ground, this terminal mustnot be grounded by the proximity device.

REJECT CONFIRMATION (REJ CON)The reject confirmation input is used to monitor thefunction of the reject device. It is usually a limit switchattached to the reject device that indicates it isfunctioning. For example, the reject device may be a

pusher bar. The reject confirmation switch, wired tothe reject confirmation input, is positioned in such away that it closes as the pusher bar reaches its

maximum extension. The electrical specifications areas follows:

VoltageLogic 0 - 0 to 0.9 VDC

Logic 1 - 3.15 to 50 VDC(NPN Open Collector can also be used)


Frequency50 Hz maximum

Minimum Pulse WidthLogic 0 - 5 mSecLogic 1 - 5 mSec

NOTE:The right terminal of this input (number 27 COM) isground. Since the metal detector is grounded only

by the input power supply ground, this terminal mustnot be grounded by the limit switch.

Electrical Installation (cont.)


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REJECT RESET (REJ RESET)The metal detector has two reject outputs, Direct andTimed. The Direct Relay always resets

automatically following a reject. The Reject Resetinput can be used to reset the timed reject. Typically,a momentary normally-opened (NO), push-buttonswitch is used for this purpose. The timed output canbe adjusted to reset automatically or manually. The

electrical specifications are as follows:

Voltage: 5 VDC

Current: 20 mA

Note: The right terminal of this input (number 23COM) is ground. Since the metal detector is

grounded only by the input power supply ground, thisterminal must not be grounded by the switch.

REMOTE COMPUTER PORTThe E-Z Tec DSP Metal Detector is capable ofcommunicating with a remote computer through anRS-485 link. The optional E-Z Link softwarepackage is required to use this feature.

CONDUITWiring to and from the metal detector should berouted through metal conduit. High voltage wiring for

the power supply and reject devices should not belocated in the same conduit as low power sensor

wiring (i.e. tachometer and reset switch). Keep metal detector wiring separate from electricsupplies carrying heavy or switched loads. This

especially true for variable speed motor control wirinInterference from electrical noise will be greadecreased by following these guidelines.

The use of metal conduit will provide necessashielding for the supply wires. The metal conduhowever, also represents a potential ground patMetallic conduit fittings must not be used to attac

conduit to the metal detector housing. Always useplastic fitting for this purpose

POWER SWITCHThe on-off circuit breaker/switch located inside tcontrol enclosure is intended to be a servi

convenience only. It is recommended that the medetector remain ON at all times to provide toptimum metal detector performance. This will al

enhance the longevity of electronic components aminimize the chance of operating the product linwithout metal detector surveillance.



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Figure 10. Connection Terminals



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Figure 10A. Connection Terminals



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Figure 10B. Connection Terminals



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OperationThis section of the manual describes the set-upprocedure and operation of the Eriez DSP MetalDetector. To understand the following discussion, it

is important first to understand that product is thematerial that is being inspected. Product may beconductive or non-conductive, but generally cannot

be metallic. Metal is the unwanted metallic materialthat may contaminate the product.

The Eriez DSP Metal Detector uses a balanced coilarrangement for metal detection. When an object

either product or metal enters the aperture, thebalanced electromagnetic field is disrupted which,in turn, generates a corresponding signal. A change

in the phase and amplitude of the signal is detected.

The output (detection) signal from the metal detectoris represented by using a polar coordinate system.The signal has an amplitude, which is proportional

to the distance from the origin of the coordinatesystem to the point representing the signal at thatinstant. The instantaneous signal also has a phase

angle relative to the undisturbed signal (from 0 to360 degrees), which is represented by the angularposition of the point of the signal at that instant. Aperiodic signal that eventually returns to its initial

conditions would be represented by a closed loop inthe polar coordinate system. Such a signal might becaused by the product or metal moving through the

detector aperture. The orientation of the long axis ofthe signals phase-amplitude representation loop mayitself be referred to as the phase angle of the signal.

The phase and amplitude of the signal, returned by

product passing through the detector, arerepresented by a football shape that occurs on thepolar gridcoordinate system. The specific phase

angle is representative of the type of product, i.e.,conductive or non-conductive. Non-conductive

products, such as paper and textiles, produceproduct signal that occurs at a zero degree angConductive products (those that contain water a

salt or minerals, etc.) are distinguished by an ozero signature. Depending on the nature of tconductive product, this signal can occur at any ang

between zero and 360 degrees. A typical polcoordinate system illustrating both types of produsignals is shown in Figure 11.

Using the polar coordinate system shown in Figure 1

detection is defined as a signal that breaks thboundary defined by the football. The auto setfeature of the E-Z Tec DSP Metal Detector automatica

determines the length and width of the football fo

particular product. Signals from metal contaminatiousually exceed the boundary of the football and tmetal detector processes these as detect signals.

INITIAL START-UPIf the Metal Detector was stored at or below 0C flonger than six hours and then moved to a warmlocation, the temperature of the unit should ballowed to stabilize long enough to allow drying

moisture, which may have accumulated on thelectronic components (overnight stabilization recommended). DO NOT APPLY POWER UNT

ELECTRONIC CIRCUITRY IS COMPLETELY DRThe detector can be activated after it has beeproperly connected to the power source (seElectrical Installation section). Use caution when fi

applying power, as the reject devices may actuawhen power is first applied. To avoid injury personnel or equipment damage, the area arou

all reject devices should be clear of personnel anobstructions before the application of power.


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Operation (cont.)

Figure 11. Showing the Relationship of Phase, Sensitivity Length and Width


25/4825

Operation (cont.)OPERATOR INTERFACEOperation and set-up of the E-Z Tec DSP MetalDetector are implemented using a 1/4 VGA touch

screen interface LCD display on the control panel.The LCD screen displays various menus with buttonsto select the desired functions. The operator controlsthe detector by touching appropriate areas of thedisplay. Pressing a button on the screen will select

the associated function. Data entry to the variousmenus is achieved via five types of data entryoperator interface screens. They include thefollowing:

Alpha Entry allows for input of alpha-numericcharacters.

Number Entry allows for keypad selection andinput of numeric values.

Time Entry allows for input of day/date.

Toggle Selection Used to switch between variouschoices (i.e., on/off, yes/no).

Immediate No input option. This feature providesan instant return to previous menus or reset to pre-

defined values. For example, pressing the Darkenoption under the Monitor/Quick Menu will instantlydarken the LCD touch screen.

MENU STRUCTUREThe primary (Level I) menu that appears after tstart-up sequence is the Monitor Menu. All other su

menus are accessible from the Monitor Menu. Thfour Level II menus are the Password, Quick, Maand Product menus (see Figure 16 and AppendA). Each of the Level II menus have various sumenus that are described in the following section

Note that a menu item can only be accessed if thalpha description menu name is enclosed by a button the screen. Accessibility varies depending on tcurrent user password.

PASSWORD MENU (LEVEL II)The E-Z Tec DSP menu structure allows the custom

to review and/or change most metal detector settinand reports. Changes cannot be made without tappropriate password. Each password consists ofour-digit number. The default passwords stored memory at the time of manufacture are shown belo

There are five separate passwords with the followihierarchy:

View: Password 0000 is the default user level whthe system is powered up. Nothing can be changat this level.

Operator: Password 1111 allows the operator

change only the running product.

Figure 12. Operator Interface Primary Menu Structure


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26

Supervisor:Password 2222 enables the customerto change the Product Number, Sensitivity, Phase,Product Description and the Detect Mode. Reject

reports can also be erased at the supervisor level.Engineer: Password 3333 allows access to allparameters plus the reject settings.

Factory:Access to the factory level is not permitted.This level of access is used only for initial set-upduring manufacture of the metal detector.

To change the password, press PW(password). Anumeric keypad will appear. Enter the four-digitpassword number and press Enter. The system willautomatically return to the previous menu. The

default password values can be changed using thePassword Set-Up Menu. Entering the passwordmenu screen and returning with no action will defaultthe system to the view access level.

QUICK MENU (LEVEL II)The quick menu contains eleven Level III menus thatprovide information and adjust user interface items.

The Level III menus are as follows (see Figure 13):Information Provides basic information aboutmanufacture of the DSP Metal Detector.

Alarm Used to toggle on/off the audible alarm usedto indicate a detection.

Beep Used to toggle on/off the audible confirmationof a touch screen input.

Darken Used to darken the contrast on the touchscreen.

Lighten Used to lighten the contrast on the touchscreen.

Operation (cont.)

Figure 13. Quick Menu Structure


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Operation (cont.)Reset LCD Used to reset the touch screen to apre-assigned contrast brightness value. The pre-assigned value is accessed through the Machine Set-

Up Menu.Zero Used to induce a hardware zero. This is atroubleshooting feature and should only be used after

contacting Eriez.

Pass Calibration Used to acknowledge that thedetector passed the automatic calibration procedure.This option is described in greater detail in the section

describing the auto-calibration feature. The featureis located in the calibration menu.

Reset Reject Used to reset the reject output if the

running product is set for manual reset. The manualreset parameter can be selected in the reject set-upmenu.

Bar Graph Toggle selection used to turn on/off thebar graph at the top of the display.

English Used to select between availablelanguages.

MAIN MENU (LEVEL II)The main menu contains eight Level III sub-menusthat control various machine functions. Each Level

III menu contains one or more Level IV sub-menus.A detailed description of the function of each menuitem follows.

Report Menu The report menu is used to managethe report data stored in the metal detector. The E-ZTec DSP can store up to 100 reports. The followingcommands are used to manipulate the report data base.

Page Allows the user to page through ten screensof previous reports. Each screen contains up to tenindividual entries.

Clear Report Clears entries that accumulated sincethe last clear report action.

Fault Menu Displays current system faults.

Clear Fault Clears the current list of faults.

Clock Set-UpDate Used to adjust date or to toggle date on/off.

Time Used to adjust clock settings or to toggclock on/off.

CALIBRATION SET-UP

The calibration feature provides an automatic promto conduct a calibration test using the test sticprovided with the metal detector. The calibration se

up menu contains five sub-menus which control tfollowing features:

Test Toggle used to turn the test feature on/off.

Start Time entry screen to specify the start timfor the automatic calibration test.

Delta Time entry screen to specify the time betwetests.

Next Label that specifies the time of the next te

Pass Calibration Provides the same function the Pass Calibration item described in the qui

menu. This action is used to acknowledge that tdetector passed the automatic calibration procedu

PASSWORD SET-UPPassword set-up is used to change the variopassword numeric codes set by the factorPasswords should be changed periodically for propoperational security, keeping in mind that the me

detector may be a critical quality control device. TOperator password is the lowest access level aallows the least number of changes. The Engine

password is the highest level of access availablethe customer. The password can only be changefor the current security level and lower. For exampif the system is at the supervisor level, only t

supervisor and operator passwords can be changeEach password can be changed using the numekeypad prompt in the Password Set-Up Menu. Th

four sub-menus are as follows:

Operator Allows entry of a new operator passwo

Supervisor Allows entry of a new supervispassword.

Engineer Allows entry of a new engineer passwo

Factory Factory use only. No access allowed.


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DIAGNOSTICS MENUThe diagnostic menu provides access to the internaloperation of the metal detector and should only be

used under supervision by Eriez.Frequency Displays the current operatingfrequency.

Drive Toggle used to turn on/off the oscillator drivepulses.

Sample Toggle used to turn on/off the samplepulses.

Diags. Mask used to turn on extra diagnosticfeatures.

Climate Diagnostic tool used to measurebackground noise in the environment.

Talk Toggle used to turn on/off communicationbetween internal hardware.

MACHINE SET-UPMD Add. Network address used in conjunction withthe E-Z Link PC software package. Each metal

detector must have a unique address.

Name Name of metal detector. Used in conjunctionwith E-Z Link PC software package.

Bar Graph Used to switch the bar graph on/off.

Zero Used to adjust the scaling of the bar graph.This feature should only be changed with directionfrom Eriez.

Span Used to adjust the scaling of the bar graph.This feature should only be changed with directionfrom Eriez.

RejCon Reject confirmation time out specified inseconds. This command determines the amount oftime to wait for a reject confirmation before a fault

occurs. The reject confirmation is selected in thereject set-up menu.

Tach Tachometer time out specified in seconds.This setting determines the amount of time allowed

between tach pulses before a fault occurs. Thisfeature provides a check to ensure that thetachometer is functioning properly.

Password The password menu item is used toenter the default time in seconds between passwordselection and default to the viewer access level. For

example, if a value of 300 is entered, the metaldetector touch screen will default to the View accesslevel after five minutes have elapsed without an

operator action on the touch screen. The touchscreen back light will also dim after the elapsed time.

TR485 Toggle to determine if a 485 terminationresistor is in the circuit. If only one metal detector is

connected to a 485 network, this feature should beturned ON. If multiple metal detectors are connectedon a 485 network all of the units should be off except

for the farthest unit from the PC.

LCD The LCD menu item allows the defaultbrightness contrast to be changed on the touchscreen pad. The screen will immediately adjust to

this value when the Reset LCD button is pressedunder the Quick/Reset LCD menu.

FACTORY SET-UPThe factory set-up menu is used during manufactureto properly configure the metal detector for eachcustomer application. This menu can not be accessed

by the user.

PRODUCT MENU (LEVEL II)This Level II menu contains fifteen Level III sub-menus to adjust product sensitivity and to configure

the product and reject system settings. Each LevelIII menu contains one or more Level IV sub-menus.The organizational structure of the Product Menu is

shown in Figure 14. A detailed description of thefunction of each menu item follows.

The E-Z Tec DSP stores 50 sets of product settingsin a table. The Product Menu allows the user to view,

edit, or run any of the 50 products in the table. Before

proceeding it is important to distinguish between therunning product and the product being edited. Therunning product is always displayed in the top blue

portion of the LCD screen. The operation of the metaldetector is determined by the running product. Theproduct being edited is the product displayed in the

product menu. If the product being edited is the sameas the running product, then changes to theparameters take effect immediately. If the product

Operation (cont.)


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Figure 14. Organizational Structure of Product Menu

Operation (cont.)


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being edited is different from the running product, thenchanges to the parameters are stored in the table butdo not affect the operation of the metal detector. The

edited product can be made the running product bysimply pushing the Run this Productbutton.

ProductUsed to select the product to edit from the table.

NameUsed to enter the alphanumeric description of theproduct.

MODESMode 1 -The metal detector processes an analogsignal from the receiver coils of the metal detector.

Conceptual examples of metal signals are shown inFigure 15. If the magnitude of the metal signal risesabove a predetermined detection threshold, the metaldetector will output a detect signal. Note that the

analog signal has a positive and a negative portion.In detect Mode 1, the metal detector will detect onboth portions of the signal. The detect signal typicallybegins with the first portion of the signal crossing thedetection threshold (at point A Figure 15) and endsafter the second portion of the signal returns through

the opposite detection threshold (at point B Figure15). Mode 1 is usually the more sensitive of the two

modes and is therefore used in most applications.

Mode 2 -Occasionally a metal detector is used inan environment where significant interference isexperienced. Typical sources of interference arelightning, static electricity, and nearby equipment withinductive loads. These types of interference usually

cause analog signals that have only one polarity. Figure15B shows typical uni-polar noise signals at D, Eand F. Each of these signals will cause a metal

detector to false detect when operating in Mode 1because they exceed the detection threshold level. The

metal detector can be adjusted to ignore many of thesesignal types by using Mode 2 detection. Refer again to

the analog signal of Figure 15A. Notice that the metalsignal has both a positive and negative polarity. Mode2 detection does not detect a uni-polar signal. It holds

off detection until the second polarity of the signaloccurs. For the signal in Figure 15A the detectionwould occur at point C. It would last a predetermined

Operation (cont.)length of time and reset. The noise signals in B ofFigure 15 would be ignored because they are uni-polar. In general Mode 2 may be somewhat less

sensitive than Mode 1 detection.Mode 2 detection may allow metal to pass undetectedin certain instances. Figure 15C shows an analog

signal representing a small piece of metal followedby a large piece of metal in the production stream.The beginning of the signal is similar to the beginningof the signal shown in Figure 15A, but as it moves

toward the negative detection threshold, the signalof the small piece of metal is absorbed by the signalof the larger piece of metal following it. The larger

piece of metal is detected at G. Note that the small

piece of metal is not detected (although it may berejected along with the closely following large piece).Extremely large pieces of metal will cause larger

fractions of the product stream to be ignored becausethe electronics will require more time to recover.Therefore the probability of missed small metalincreases with the size of the largest expected tramp

metal. Normally this area is small because the trampmetal is small. The probability is low that metal willbe missed, but the possibility exists and must be

considered before one decides to use Mode 2detection.

If the metal detector works reliably using Mode 1

detection, Eriez recommends using this mode. Someapplications are electrically noisy and the number offalse trips is high enough that the metal cannot beused in Mode 1. In this case one must decide whether

to use Mode 2 detection with an increased probabilityof missing a small percentage of metal. Eriezrecommends its use only when necessary.

Every E-Z Tec DSP Metal Detector leaves the factorywith an Individual Unit Specification Sheet. This sheetwill indicate whether the unit is set for Mode 1 orMode 2 detection. Most units will be set for Mode 1

detection. The mode is shown on the Monitor Menuat power up.

SpeedThe speed in units of feet/minute at which the productis passed through the aperture.


31/4831

Figure 15. Example of an Analog Detection Signal

Operation (cont.)


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GainThis is a factory setting set by Eriez.

Phase

Adjusts the phase of the elliptical football signalboundary used to determine detection. Thisadjustment is used to prevent the metal detector from

detecting the product under inspection. Moreinformation can be found in the Operation section ofthis manual.

SensitivityScales the length and the width of the ellipticalfootball signal boundary used to determinedetection. Controls the ability of the metal detector

to detect metal. The range is 00 to 250, with the metal

detector most sensitive at a setting of 250. After anautomatic setup, the sensitivity will be set to 100. Ifthe detector is not responding to metal particles of

the desired size, increase the sensitivity slightly. Ifthe detector experiences excessive false detects,decrease the sensitivity slightly. After any reduction

in sensitivity, verify that the target metal particles arestill detected reliably. More information can be foundin the Operation section of this manual.

LengthAdjusts the length (primary axis) of the elliptical

football signal boundary used to determinedetection. This value should only be changed by a

person with an understanding of metal detectorsignals. Note that the length should always be greaterthan the width. More information can be found in theOperation Section of this manual.

WidthAdjusts the width of the elliptical football signalboundary used to determine detection. This value

should only be changed by a person with anunderstanding of metal detector signals. Note that

the width should always be less than the length. Moreinformation can be found in the Operation section of

this manual.

Copy ThisCopies all of the settings from the product being

edited into temporary memory. This button works inconjunction with the Pastebutton.

PasteCopies all of the product settings from temporarymemory, when the Copy Thisbutton was pressed,

to the product being edited. This button works inconjunction with the Copy Thisbutton.

ActiveThis button works in conjunction with the andbuttons. The and buttons allowthe user to scroll through all of the Active productsin the table. If Active=YES for a product entry in the

table then it is added to the list of entries that will bescrolled through when the and buttonsare pressed.

Run this Product

Makes the product being edited the running product.

Auto Set-UpThe E-Z Tec DSP is equipped with an Auto Product

Set-Up function that provides for automatic set-up ofthe detection parameters (Phase, Length, Width andSensitivity). A product sample and metal test sphereare required to complete the auto-product set-upprocedure. Ancillary equipment such as conveyorbelts should be operating prior to initiating the autoproduct set-up procedure. All other machinery located

near the metal detector should be operating normally.

This is imperative to ensure that the metal detectoris set-up under normal background conditions. The

automatic set-up procedure is initiated by pressingthe Auto Set-Up button. A menu to learnenvironmental noise will appear for several secondsafter depressing the auto set-up button. The system

will then provide an option to Startor Cancelthe calibration procedure.

Start - Used to initiate the Auto-Product Set-Upprocedure. After initiating the auto-product set-upprocedure, the user will have the option to stop the

procedure after passing the product through the metaldetector or canceling the procedure. If the process

is canceled, the user will be returned to the ProductMenu. After stopping the auto-product set-upprocedure, the user can accept the result or cancelthe procedure. Accepting the result will return the

user to the Product Set-Up Menu.

Operation (cont.)


33/4833

Cancel -Used to terminate the Auto-Product Set-Up procedure.

Reject Set-Up

Travel -Enter the time (0 to 60 seconds) delay fromdetection to actuation of the reject device. Successivedetections are stored in memory and are not lost.

They are sequentially moved through a shift registerand emerge as reject outputs with the delay.

Duration -Enter the time that the reject signal is tobe held on, after the travel time (0 to 60 seconds).

Reset - The reject signal can be set to resetautomatically or remain on until reset is initiated viaan appropriate switch. Select Autofor automatic

reset. Select Manualto use a switch for reset.Index -An index device is a mechanical switch,proximity switch, photo-eye etc., used to indicate

when a product is in position for the reject device todivert contaminated product from the product stream.Select Yes or No depending on whether anindexing device is used or not used.

Space -This setting is selected to indicate whetherthere is always space between adjacent products.Set this to Noif it is not certain that there will alwaysbe space between adjacent products.

Window -In the case of packaged product, the exactposition of metal inside the product package is notknown when it is detected. Depending on product

separation, it may be impossible to know whichpackage contains the metal. The window is usedto set up a range of time or tachometer pulses

(perhaps a few packages long) where it is certainthe metal is located.

Delay -Used only with an index device. Enter thetime between the index device sensing the product

and the reject device activating, (0 to 60 seconds). Ifan index device is not used set the time to zero.

Tach - Applications with inconsistent or changingproduct speed cannot use time as the criterion toissue the reject signal, because the time required forthe contaminated product to travel from the metaldetector to the reject device varies. An example of

this is a variable speed conveyor. A tachometer must

Operation (cont.)be used to monitor the conveyor speed and suppthis information to the detector. If the Tach inputset to Yes, the function of the travel time inp

changes from a number value representing time tonumber value representing the number of tachometpulses needed to move a detect signal through t

shift register and output a reject signal. Select Nif a tachometer is not used.

RejCon -The reject confirmation input is used monitor the function of the reject device. It is usua

a limit switch attached to the reject device thindicates that the latter is functioning. For exampthe reject confirmation device may be a swit

attached to a pusher bar used to reject a box from

conveyor. The switch is positioned in such a way thit closes as the pusher bar reaches its maximuextension. If reject confirmation is needed sele

Yes, if not select No.

OPERATING PROCEDUREThe following procedures provide a step-by-steprocedure for programming the essential menu itemcalibrating and operating the E-Z Tec DSP Metal Detect

BOOT UP MENUUpon power up the Boot Up screen will appear the display for about ten seconds, (See Figure 16). Th

display is a system self check showing codemessages. If this screen stays on longer than tseconds, a message appears cycle power to continu(i.e. turn the power off and on). If such a messag

appears, turn the power off and then on again.

MONITOR MENUAfter the self-check, the metal detector will default

the Monitor Menu (See Figure 17) and the messaPlease Wait will appear at the top of the screeOnce the message disappears, the touch screwill become active and the detector will b

operational. This menu displays the normal operaticonditions and allows access to the four Levemenus described above: Password, Quick, Main aProduct. The date and time appear in the upper rig

hand corner. The word View appears in the lowleft hand corner indicating the password level. Tdisplay automatically returns to this menu if no inpu

are made in other menus for a user-specified tim


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Figure 16. Boot-Up Menu

Figure 17. Monitor Menu

Operation (cont.)


35/4835

SET TIME AND DATEThe real time clock is set at the factory to the localfactory time and date. To change the time and or

date for your location proceed as follows:Set the password level to supervisor (2222) or higherand select the Main Menu followed by ClockSetup and then Time. The E-Z Tec DSP clockoperates on a 24-hour time standard. The time entryscreen appears and the current time setting is shown.The time is incremented up or down using the +plus or -minus keys. The left-hand keys incrementthe hours and the right-hand keys increment theminutes (See Figure 18). Press Enterto set thenew time. The Enter command resets the seconds

to zero.SET DATETo change the date, return to the Clock Setupmenu and select Date. The date entry screen willappear showing the current date. The date isincremented up or down using the plus +or minus-keys. The right-hand keys increment the years,the middle keys increment the day, and the left-handkeys increment the month. (See Figure 19).

INITIAL SYSTEM CONFIGURATIONThe initial set-up procedure for the E-Z Tec DSP Metal

Detector consists of entering the followingparameters:

Password (s)

Product Name (s)

Operating Mode

Speed

Auto Setup

Reject Setup

Select the Password Menuand enter the EngineerPassword (3333). Press Enterand the system willreturn to the Monitor Menu. Select Product Menuand then Name to enter the product name. Analpha entry screen will appear (See Figure 20) and

the product name can be entered by scrolling the

arrow keys to the desired character position and theincrementing either a letter or a number with the pl

+ and minus - keys. A letter is selected

pressing the Alphakey. A number is selected pressing the Numberkey. Press Enterand tdisplay will return to the Product Menu.

Select the Modefunction and choose the ModeOperation (Mode 1 or Mode 2). E-Z Tec DSP MeDetectors can operate in either of two detect modeThe most appropriate mode for a given applicati

depends largely upon environmental conditions aupon the mix of tramp metal in the product streamdetailed discussion of the mode function w

presented in a previous section of this manual.

Select the Speedoption under the Product me(Figure 21). The number entry keypad will appeaEnter the product speed in feet per minute. Pre

Enterand the display will return to the product men

If applicable, turn the metal detector conveyor oCheck to determine if all devices, machines, elocated near the metal detector are operatinormally. This is necessary during the auto-produset-up step since the metal detector will learn aboits operating environment. Press Auto Setup.noise menu will pop up for approximately fiv

seconds followed by a start menu. Press Startapass the product through the aperture. The detect

should not beep before the product is passed throuthe aperture. If it does, press Backand repeat thstep. Press Stopafter the product passes througthe aperture. At this point the screen will upda

showing the Old Settings, New Settings, and tMeasured Values. Press Accept.

Repeat the auto-product set-up procedure an

compare the old and new settings. Repeat thprocess to get a feel about how the product

reacting. If the new and old values for length anwidth are within 10%, the auto setup process

complete. Note that pressing Backat any timwill move the process back one step. Press Canceto return to the Product Menu. This completes tautomatic product set-up procedure.

Operation (cont.)


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Figure 18. Clock Set-Up Menu

Figure 19. Date Set-Up Menu

Operation (cont.)


37/4837

Figure 20. Alpha Entry Screen for Product Name

Figure 21. Product Menu

Operation (cont.)


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38

The final step of the set-up procedure requires inputof the various values associated with the rejectmechanism. These options are summarized in the

table Reject Set-up Input Parameters.In some cases, a tachometer must be used to monitorthe conveyor speed. If the Tach input is set to Yes,the travel time entry changes from a number valuerepresenting time to a number value representingthe tachometer pulses needed to move a detectsignal through the shift register and output a reject

signal. See previous sections of this manual for amore detailed explanation of each item in the table.

The metal detector and/or its system is now

operational. Check that the product runs properly.

VERIFY DETECTIONNormally every Eriez Metal Detector is calibratedbefore shipment to detect a specific sphere size of a

specific material. Appropriate test spheres areshipped with each unit. Using the test sphere(s)provided and/or samples of the metal you desire todetect, pass the metal through the aperture. It isimportant that the metal pass through the apertureat a speed and in the direction that it is expected to

pass during normal operation. Do not bring yourhands close to the aperture while performing this test,

the detector may respond to the hand as if it were

metal. The detector should only respond with detectindications while the test metal is passing throughthe aperture. CAUTION: Reject devices may

activate. Make sure personnel and equipmentare clear.

The sensitivity adjustment range of Eriez DSP Metal

Detectors is 00 to 250. Refer to Figure 11 for anunderstanding of sensitivity. As shipped, the E-Z TecDSP is adjusted to detect the rated metal size withthe Sensitivity set at 100. A security level of

supervisor or higher is required to change thesensitivity. The sensitivity is adjusted by entering theProduct Menu and selecting Sensitivity. TheNumber Entry screen will appear and a rectangular

box in the upper left hand portion of the screen belowthe Sensitivity button will indicate the current setting.The sensitivity can be adjusted by typing the new

value on the keypad and pressing Enter or thevalue can be incremented in steps of ten with theplus +or minus -keys and pressing Enter.

The Phase setting is used to prevent the metaldetector from detecting the product under inspection.The phase is determined during the automaticproduct set-up procedure. Changes to this value

should only be attempted by personnel with metaldetector experience or with supervision from Eriez.

Operation (cont.)


39/4839

ADDITIONAL FUNCTIONSThe Product Menu has a Copy Thisand a Pastebutton. These can be used to copy the settings from

one product number to another. To copy the settingsof a current product to a different product, press

Copy Thisfollowed by Product. Enter the newproduct number using the Number Entry keypadand press Enter. Press Pastewhen the ProductMenu appears. A verify screen will appear with Yesand Nobuttons to confirm the operation.

It is critical to remember changes to your password(s).The metal detector cannot be adjusted without thecorrect passwords. If the passwords are forgotten,

Operation (cont.)contact Eriez for assistance. To change the passworgo to the Main Menu and press Password SetupPress Operator, Supervisoror Engineer

select the password level to change. The numbkeypad will appear. Type a four or less digit numbdisregarding the leading zero and press Enter. Tmonitor will return to the previous screen wheanother level can be selected. If no more entries amade after the user specified time, the screen wreturn to the monitor View menu.


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MaintenanceE-Z Tec Metal Detectors are water tight and will notbe damaged by normal water contact, including

judicious use of high pressure sprays. Good

maintenance practice, however, dictates that high-pressure spray should not be directed at precisioncomponents in areas that do not contact the product,

such as the control panel. This preventative actionwill prolong the life of the metal detector. The standardmetal detector control panel may incur damageduring high-pressure wash down. Such damage is

not covered by warranty. Some cleaning agents maycause damage or discoloration of the control paneland/or the aperture liner. An optional clear protectivecover for the display is available for high pressure

washdown applications.

The metal detector should be inspected regularly forphysical damage, especially in the region of the

aperture liner. The unit should be kept clean and dry,if possible. Generally, this is all that is necessary tokeep the unit working at peak performance. In theevent of any abnormality, please contact the factory.

No periodic maintenance or adjustment of the metaldetector is required. A quick test at the beginning ofevery shift is recommended.

Required periodic maintenance for conveyors and/or reject devices supplied by Eriez will be specifiedon the system outline drawings and/or on placards

attached to the components themselves. For thetypical system, check the following at least once per40-hour work week:

Conveyor and drive belts for tension, alignmentand condition

Bearings for lubrication, metal contamination andwear

Air supply for pressure and moisture trap condi-tion

Support frame for loose connections, rust and

wear from belt contact

Conveyor belt slider bed for condition includingwear and embedded metal

All operating mechanisms (reject pusher arms,gates, chutes, etc.) for condition and timing ofoperation.


41/4841

TroubleshootingCurrent or Ground Loops are a common cause oftrouble in Metal Detection Systems. Many falsedetections by a Metal Detector are caused by the

presence of current or ground loops. Current loopsare best described as any combination of piping,conduit or structural steel forming an electrical loop

near the detector aperture. A loop acts as a secondaryturn on a transformer, absorbing energy from thedetector. If a change occurs in a loop, that is, if theloop is opened or closed, it will absorb more or less

energy from the detector. The detector will, in turn,sense this change and a false detection will occur.

This phenomenon can be simulated by placing a loop

of wire approximately 2-3 feet (600-900mm) in

diameter in close proximity to, and in the same plane,as the aperture. Opening and closing the loop circuitcan make the detector false trip. As the loop is moved

farther from the aperture, a point will be reachedwhere the loop ceases to have an effect on thedetector. This is determined by the size of the loop,its orientation with respect to the detector aperture,

sensitivity setting of the detector and detectoraperture size.

Observing a conveyor (see Figure 5), it can be seen

how the ground loops can be formed by thestructural members of the conveyor. For example,the idler rolls on either side of the aperture, in

conjunction with the conveyor frame, form a looparound the detector aperture. If the idler bearingmomentarily loses electrical contact with the shaft,a false detection may occur.

The effect of ground loops is not restricted to tconveyor frame. Pipes or conduits in the vicinity the aperture (not necessarily tied to the convey

frame) may form loops which, if interrupted, mcause a false detection. Insulating or bonding aloose contact areas will eliminate the effect of the

loops on the detector.

To locate current loops or determine whether they acausing false detection, shut down the conveyor whleaving the metal detector energized. Manually sha

or probe conveyor idlers, conduits, etc., to determiwhere contact is being interrupted. Conveyor idleadjacent to the aperture and return belt idlers in clo

proximity should receive particular attentio

Experience indicates that a majority of false detectiproblems have been attributed to conveyor belt idleThe need for thorough inspection of idlers cannot

over-emphasized. The best method of determiniwhether a conveyor idler is causing a problem is stop the conveyor and manually attempt to move tidler within its bearing (with the conveyor stopped a

the detector energized). If a particular idler is a sourof trouble, the metal detector can be made to faldetect. If it is determined that a particular idler

causing a false detection, it must be either removor the bearings insulated from the conveyor fram

The troubleshooting guide presented below can used as a guideline to evaluate potential ground lo

and power supply problems.


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Troubleshooting (cont.)


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Spare Parts


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Appendix A

Figure A1. Monitor Menu

Figure A2. Password Menu


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Appendix A (cont.)

Figure A3. Quick Menu

Figure A4. Main Menu


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46

Appendix A (cont.)

Figure A5. Product Menu


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NOTES:

Documents

Eriez Metal Detectors