PREWARN = PRESET PREWARN
This section deals with most of the common problems that
you may encounter with the PC100, the possible causes and
the recommended remedies. Most of the problems are due to
improper wiring and or programming procedures. However,
the problem may originate in the flow meter, valve, pump, or
other piece of equipment.
Make sure other equipment is functioning properly. All
PC100s are extensively tested at the factory before ship-
ment. However, the units may get damaged during transit,
installation, or errors in wiring. If after all possible solutions
have been tried and the problem persists, contact your local
representative or call our Industrial Sales Department at
(414) 355-0400.
TROUBLESHOOTING
THE PC100
18
PROBLEM POSSIBLE CAUSES REMEDIES
Unit is powered but the display
1. Incorrect AC or DC power wiring.
1. Recheck power wiring, fuses, etc.
does not light up.
Unit works fine but occasionally
1. Line noise is affecting processor
1. Use dedicated power or install
the display freezes up.
due to a current spike or surge.
surge suppression network.
Transmitter is connected but
1. Transmitter wiring is not correct.
1. Check wiring diagrams.
the PC100 does not count.
2. EPT1 transmitter current regulator.
2. Install current regulator module.
3. Transmitter is defective.
3. Replace parts or whole.
4. PC100 is defective.
4. To confirm, connect wire to terminal
#12 and short to input terminals #10 or
#14. Each contact should produce a
visible count on the display when scale
factor = 1.
5. Wrong scale factor.
5. Check scale factor calculation,
i.e., if programmed .0001 instead of
1.0000, unit will wait for 1000
pulses before decrementing count.
6. Low frequency jumper for slow
6. Disconnect low frequency jumper
pulse input is connected.
from terminals #11 or #13.
Relays do not de-energize at
1. Relays are not properly connected.
1. Reconnect relay wiring.
setpoints.
2. Relay is defective.
2. Replace relay.
3. Connection between transistor out-
3. Check connections.
puts #8 & #9 and relay inputs are loose.
4. Relays are not plugged in all the way.
4. Unplug and replug relays.
Counter accumulates
1. Switch bounce causing extra pulses.
1. Install low frequency jumper.
too many counts.
2. Electrical noise causing extra pulses.
2. Check wiring. Be sure power lines are
not bundled with signal lines. Use
shielded wire. Connect ground to
terminal 32.
3. Excessive vibration at meter.
3. Dampen vibration.
Some of the keys on the front
1. Defective switches.
1. Repair or replace PC100.
panel are not operational.
2. Unit is programmed to disable
2. Check programming functions.
certain switch functions.
Unit is operational but front
1. Operator using sharp objects to
1. Connect external remote switches
panel has excessive wear.
program unit or certain keys are
to control frequently used functions
used too often.
and replace front panel.
Five decimal points light
1. Prewarn setpoint is larger than
1. Reprogram preset points.
up on the display.
batch size.
Cannot program batch size,
1. Batch size exceeds batch limit.
1. Reprogram smaller batch or
display reverts back to
deactivate batch limit.
old batch preset.
Summary of Contents for PC100
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