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6-2 Troubleshooting (continued)
6-2.2 Problems
Symptom:
Display will not light.
Possible Cause: No power to unit, power to unit
not to specifications.
Test Procedure: See Specifications Section 1-4 for
proper input voltages. Then;
a) Check AC voltage input on terminals 17
and 18.
b) (if DC Powered unit) Check DC voltage
input on
terminals 12 and 14.
Corrective Action:
If Power checks okay, replace
unit.
Symptom:
Relays do not trip.
Possible Cause #1: Incorrect programming.
Test Procedure: Check for relay assignment and/
or duration times, review manual.
Corrective Action:
Reprogram unit as required.
Possible Cause #3: Defective Circuit board or
component.
Test Procedure: Input pulses and check for relay
action. An OHM meter across the appropriate
relay terminals should give the proper indication.
(Be sure to disconnect all power to the relay
terminals first!)
Corrective Action:
If no relay action replace unit.
Note: Presets are entered only as positive
numbers. If display has (-) sign relay will not trip.
Note: Relay tripped by total counter will not trip
again until unit has been reset.
6-2.2 Problems
Symptom:
Unit not totalizing.
Possible Cause #1: Incorrect programming.
Test Procedure: Check for programming errors,
review manual. For Example, if a K Factor is too
large or at zero, it may take some time before a
count is registered on the display.
Corrective Action:
Reprogram unit as required.
Possible Cause #2: Input signal invalid.
Test Procedure: See Specifications Section 1-4 for
proper input signals. Then use oscilloscope to
check Digital voltage input on terminals 3 and 12.
Corrective Action:
If inputs check okay, replace
unit.
6-3 Removing the Case
To install or change the input or data interface
cards, the case must be removed.
Remove all
power before opening the case. CMOS logic
is used so observe standard precautions against
damage by static discharge. On units with RS232
or RS422, two screws on the back, holding the top
left connector, have to be removed. Next, remove
the six (6) flat head screws behind the front bezel
and lift off the bezel assembly. Slide the main
board display out the front of the case by pushing
from the rear. Once modifications are made,
reverse the procedure to reassemble the unit.
Make sure that the main board is in the track.
The six (6) screws that hold the panel must be
tight to seal the rubber keypad panel assembly,
approximately 0.6 in-lb torque.
Summary of Contents for KEPtrol F/C
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