Eriez E-Z TEC IV, Installation, Operation And Maintenance Instructions

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TEST (using MPC DIAGNOSTICS Menu) RESULT ACTION REQUIRED
1. Turn Transmitter off, leave Receiver on Unit still false trips Go to Step 2.
False tripping stops Look for ground loops (refer to the
Mechanical Installation Section of this manual).
2. Leave Transmitter off, turn Receiver off Unit still false trips Power supply noise is suspected. Power the
metal detector from a “clean” power source,
or install a power conditioner. Suppress
inductive kickback from solenoids, etc. on the
power line. Look for variable speed motor
drives that are supplied from the same power
line as the metal detector.
False tripping stops Airborne electrical noise is suspected. Look
for two-way radios, nearby variable speed
motor drives, solenoids, static electricity, etc.
3. Turn Receiver on, turn Transmitter on False tripping stops Fault corrected, leave the Troubleshoot menu.
False tripping continues Look for further ground loops
Self-Check (Figure 43)
The Self Check feature is used to monitor the main
electronic circuits responsible for detecting metal and
to alert the operator if a failure is detected. The process
of testing the circuits requires at most one second to
complete and causes a detection to occur if the test
passes. If the test fails, the detection does not occur
and a Self Check fault is generated and listed in the
FAULT menu. In addition, the Fault relay is enabled
and “FAULT” is listed in the Reject Reports.
The engineer may adjust the Self Check as needed.
Once set up, the MPC will perform the tests
automatically with no further input. The adjustments
are explained below.
Test Disabled/Enabled
This variable turns the Self Check feature on
and off. Position the cursor at “Test” and
change the variable as needed using the INC
and DEC keys.
Test Now
The Self Check test can be initiated manu-
ally using this command. Move the cursor to
“TEST NOW” and press “GO TO”. The MPC
will perform one Self Check operation.
Skip Detect/Reject
Self Check causes a detection to occur so both
Direct and Timed Rejects are enabled in re-
sponse to it. Since the Self Check operation
requires no more than 1 second to complete,
it is likely no metal is present. The customer
may inhibit the reject responses (due to the
self check only) by setting the Skip Detect/
Reject variable to Yes. It should be noted how-
ever that if metal passes through the metal
detector during the self check process it could
be missed and allowed to continue in the prod-
uct stream. The decision to skip the Direct and
Timed Reject responses is the sole responsi-
bility of the operator.
MPC Controls and Displays (cont.)