Frick QUANTUM Maintenance Manual page 9

SYMPTOM
COMPRESSOR AUXILIARY SHUTDOWN
OIL HEATERS DO NOT OPERATE
COMPRESSOR DOES NOT LOAD and/or
UNLOAD* (Compressor that steps on Capacity)
COMPRESSOR WILL ONLY PARTIALLY LOAD*
(Compressor that steps on Capacity)
FRICK QUANTUM CONTROL PANEL
MAINTENANCE
PROBABLE CAUSES and CORRECTIONS
Output 1 controls the Compressor Start Relay (By others). If the com-
pressor does not start and the LED (D1) for Output 1 (MOD 1) is on,
check for the proper panel voltage between position 4 and 1 on the
P1 DIO connector on Digital I/O board #1. If the proper voltage is not
found, check the fuse (F1) and if the fuse is OK, check the output
module (MOD 1). If the voltage was OK, check for the proper voltage
between position 1 on the P1 DIO connector and position 18 on the
terminal strip. If voltage is OK, check for the proper voltage between
position 18 and 2 on the terminal strip. If the voltage is OK, check the
interposing relay (By others).
The Compressor Starter Auxiliary Contacts turn on Input 2 (MOD 2) of
Digital I/O Board #1 when they are closed. These contacts are located
on the Compressor Starter. If the input does not turn on check if the
LED (D2) is lit when it should be. If it isn't, check the fuse (F2) and if the
fuse is OK, check the input module (MOD 2).
The oil heaters should operate only when the compressor is NOT
running and the oil separator temperature is not greater than or equal
to the "Oil Heater Off Above" setpoint.
If the oil heaters do not work and the LED (D21) for Output 21 (MOD
21) is on, check for the proper panel voltage between position 4 and
1 on the P6 DIO connector on Digital I/O board #1. If the proper
voltage is not found, check the fuse (F21) and if the fuse is OK, check
the output module (MOD 21). If the voltage was OK, check for the
proper voltage between position 1 on the P6 DIO connector and po-
sition 9 on the terminal strip. If voltage is OK, check for the proper
voltage between position 9 and 2 on the terminal strip. If the voltage
is OK, check the Oil Heater Relay (1CR).
If the problem hasn't been located, check the circuit breaker (1CB). If
the breaker is not tripped, check power into 1CB. If OK check be-
tween Wires 103 and 106. If the Oil Heater Relay (1CR) is closed,
check for proper panel voltage between wires 106 and 102. If OK,
check the Oil Heater.
For a 4-Step compressor, verify that the 50% SV (Solenoid Valve) is
energized BEFORE the 75% SV is energized. For a 3-Step compres-
sor, verify that 75% SV is energized BEFORE the 100% SV. Feel
hydraulic tubing to the compressor unloading pistons. If tubing is hot,
inspect the unloader pistons for worn parts or improper seating.
Check that the hydraulic valves feeding the solenoid valve as well as
those feeding the unloader pistons are open.
Confirm that hydraulic tubing and wiring is properly connected.
Check the solenoid valve coil to see if it has been damaged.
NOTE: Verify that the proper capacity control setpoint has been
programmed.
With the first SV (solenoid valve) properly energized, verify that the
second SV energizes and then check the third SV if there is one for
this compressor model.
Check that the hydraulic valves feeding the first SV as well as those
feeding the compressor unloading pistons are open.
S90-010 M
Page 9