44
Table 17 — PIC 5 Alarm Codes (cont)
ALARM
CODE
(ALARMRST)
ALARM TEXT
DESCRIPTION
RESET TYPE
ACTION TAKEN
BY CONTROL
POSSIBLE CAUSE
INTEGRATED STARTER MODULE ALARMS (CONT)
Alm-423
ALM-423 ISM Fault — Cal-
ibration Factor Error
Manual
Unit shuts down.
Check ISM Calibration Values
Alm-424
ALM-424 ISM Fault —
Invalid Configuration Error
Manual
Unit shuts down.
Check ISM Configurations
Alm-425
ALM-425 VFD Fault —
Single Cycle Dropout
Manual
Unit shuts down.
Temporary loss of voltage. Disable Sin-
gle Cycle Dropout in CFGUMVFD
screen.
Alm-426
ALM-426 VFD Fault —
Line Current Imbalance
Manual
Unit shuts down.
Check phase to phase and phase to
ground power distribution bus voltage.
Check Line Current Imbalance% in
CFGUMVFD screen.
Consult power company.
Alm-427
ALM-427 VFD Fault —
High Line Voltage
Manual
Unit shuts down.
Check phase to phase and phase to
ground distribution bus voltage.
Consult power company.
Alm-428
ALM-428 VFD Fault —
Low Line Voltage
Manual
Unit shuts down.
Check phase to phase and phase to
ground distribution bus voltage.
Consult power company.
Alm-429
ALM-429 VFD Fault —
Low DC Bus Voltage
Manual
Unit shuts down.
Verify phase-to-phase and phase-to-
ground line voltage.
VFD Circuit Board malfunction.
Call Carrier Service.
Alm-430
ALM-430 VFD Fault —
High DC Bus Voltage
Manual
Unit shuts down.
Verify phase to phase and phase to
ground line voltage.
Monitor AC line for high transient voltage
conditions.
VFD Circuit Board malfunction.
Call Carrier Service
Alm-431
ALM-431 VFD Fault —
VFD Power On Reset
Manual
Unit shuts down.
Temporary loss of VFD control voltage.
Check VFD control power breaker,
transformer, and fuses
Alm-432
ALM-432 VFD Fault —
Ground Fault
Manual
Unit shuts down.
Check for condensation on motor termi-
nals.
Check motor power leads for phase to
phase or phase to ground shorts.
Disconnect motor from VFD and megger
motor.
Call Carrier Service.
Alm-433
ALM-433 VFD Fault —
Line Phase Reversal
Manual
Unit shuts down.
Reverse connections of any two line
conductors to circuit breaker.
Alm-434
ALM-434 VFD Fault —
Motor Overload Trip
Manual
Unit shuts down.
Check VFD configurations
Any phase current > 106% RLA. Can
result from significant load side current
imbalance when running at full load.
Check entering condenser water tem-
perature and water flow rate.
Check Motor Rated Load Amps in
CFGUMVFD screen.
Alm-435
ALM-435 VFD Fault —
Rectifier Power Fault
Manual
Unit shuts down.
Check VFD Status
Malfunction within VFD Power Module.
Call Carrier Service.
Alm-436
ALM-436 VFD Fault —
Inverter Power Fault
Manual
Unit shuts down.
Check VFD Status
Malfunction within VFD Power Module.
Call Carrier Service.
Alm-437
ALM-437 VFD Fault —
Rectifier Overcurrent
Manual
Unit shuts down.
Check VFD Status
Check for high water temperatures or
changes in water flow rates.
Alm-438
ALM-438 VFD Fault —
Inverter Overcurrent
Manual
Unit shuts down.
Check VFD Status
Check for high entering water tempera-
ture or low condenser water flow.
Check current settings in CFGUMVFD
screen.
Alm-439
ALM-439 VFD Fault —
Condenser High Pressure
Manual
Unit shuts down.
Check Compressor Discharge High
Pressure switch wiring and accuracy.
Check for high condenser water tem-
peratures, low water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables in refrigerant.
Alm-440
ALM-440 VFD Fault —
Motor Amps Not Sensed
Manual
Unit shuts down.
Check main circuit breaker for trip.
Increase Current % Imbalance in
CFGUMVFD screen.
Alm-441
ALM-441 VFD Fault —
Motor Acceleration Fault
Manual
Unit shuts down.
Check that inlet guide vanes are fully
closed at start-up.
Check Motor Rated Load Amps in
CFGUMVFD screen. Reduce unit pres-
sure if possible.
