Operating instructions

103
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• faulty compressor temperature thermistor
• faulty wiring and loose plugs
• faulty CPM board
Compressor High Pressure Switch Protection
Alarm 111-03 — Circuit A (A1.03)
Alarm 112-03 — Circuit B (B1.03)
Alarm 113-03 — Circuit C (C1.03)
Criteria for Trip — The alarm criterion is checked when the
compressor is ON. This alarm will be generated if the circuit
high-pressure switch (HPS) opens for more than 2 seconds.
The CPM board monitors the HPS switch.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual (reset button on switch)
Possible Causes — If this condition is encountered, check the
following items:
• condenser fan or contactor failure of loss of condenser air
flow
• compressor operating beyond the operation envelope
• faulty high pressure switch or wiring
• faulty CPM board
Compressor Overcurrent
Alarm 111-04 — Circuit A (A1.04)
Alarm 112-04 — Circuit B (B1.04)
Alarm 113-04 — Circuit C (C1.04)
Criteria for Trip — The alarm criterion is checked when the
compressor is ON. This alarm will be generated if the CPM
board detects a motor current greater than 93% MTA (must
trip amps) and less than 2 times that for more than 1.7 seconds.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Compressor operating beyond the operation envelope.
• Incorrect MTA setting.
Compressor Locked Rotor
Alarm 111-05 — Circuit A (A1.05)
Alarm 112-05 — Circuit B (B1.05)
Alarm 113-05 — Circuit C (C1.05)
Criteria for Trip — The alarm criterion is checked during
start-up when the compressor is ON. This alarm will be gener-
ated if the CPM board detects a high motor current compared
with the MTA (must trip amps) setting for more than 450 ms.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• compressor mechanical failure
• unloader slide valve failure
• compressor motor failure
Compressor Phase Loss
Alarm 111-06 — Circuit A L1 (A1.06)
Alarm 112-06 — Circuit B L1 (B1.06)
Alarm 113-06 — Circuit C L1 (C1.06)
Alarm 111-07 — Circuit A L2 (A1.07)
Alarm 112-07 — Circuit B L2 (B1.07)
Alarm 113-07 — Circuit C L2 (C1.07)
Alarm 111-08 — Circuit A L3 (A1.08)
Alarm 112-08 — Circuit B L3 (B1.08)
Alarm 113-08 — Circuit C L3 (C1.08)
Criteria for Trip — The alarm criteria are checked during
startup when the compressor is ON. This alarm will be gener-
ated if:
• The current unbalance on any of the 3 phases is greater than
48% for more than 1 second continuously during start-up.
• The current unbalance on any of the 3 phases is greater than
48% for more than 2 seconds continuously during runtime.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• power failure
• blown fuse or tripped circuit breaker
• power wiring errors or loose terminals
Compressor Low Current
Alarm 111-09 — Circuit A (A1.09)
Alarm 112-09 — Circuit B (B1.09)
Alarm 113-09 — Circuit C (C1.09)
Criteria for Trip — The alarm criteria are checked when the
compressor is ON. This alarm will be generated if:
• The current is less than 15% MTA on all three legs for more
than 1 second for Wye-Delta start units.
• If the current is less than 15% of MTA on all three legs for
more than 1 second for direct start units.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• power failure
• blown fuse or tripped circuit breaker
• deenergized contactor
• faulty current toroid
• high pressure switch (HPS) trip (when auto reset HPS is
used)
Compressor Wye-Delta Starter Current Increase Failure
Alarm 111-10 — Circuit A (A1.10)
Alarm 112-10 — Circuit B (B1.10)
Alarm 113-10 — Circuit C (C1.10)
Criteria for Trip — The alarm criterion is checked during
compressor start-up. This alarm will be generated if the current
in Delta mode is not more than 25% greater than the current in
Y mode within 550 ms.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• power supply failure to the delta contactor
• faulty wiring to the delta contactor
• faulty CPM board
• faulty current toroid
Compressor Contactor Failure
Alarm 111-11 — Circuit A (A1.11)
Alarm 112-11 — Circuit B (B1.11)
Alarm 113-11 — Circuit C (C1.11)
Criteria for Trip — The alarm criterion is checked during
compressor shutdown. This alarm will be generated if the cur-
rent is greater than 15% of the MTA on at least one phase for
10 continuous seconds.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• faulty or welded contactor
• faulty wiring
• faulty CPM board