Carrier PIC 5+ User Manual page 41

Alarm
Description of the alarm text Reset type
code*
Alm-404 ALM-404 ISM Fault - Line
Current Imbalance
Alm-405 ALM-405 ISM Fault - Line
Voltage Imbalance
Alm-406 ALM-406 ISM Fault - Overload
Trip
Alm-407 ALM-407 ISM Fault - Motor
Locked Rotor Trip
Alm-408 ALM-408 ISM Fault - Starter
Lock Rotor Trip
Alm-409 ALM-409 ISM Fault - Ground
Fault
Alm-410 ALM-410 ISM Fault - Phase
Reversal Trip
Alm-411 ALM-411 ISM Fault - Line
Frequency Trip
Alm-412 ALM-412 ISM Fault - Starter
Module Reset
Alm-413 ALM-413 ISM Fault - Start
Contact Fault
Alm-414 ALM-414 ISM Fault - Transition
Contact Fault
Alm-415 ALM-415 ISM Fault - OIl Pump /
HPS Failure
Action taken by the
control
As above As above
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Possible cause
Current imbalance > CURRENT % IMBALANCE for greater than the
CURRENT IMBALANCE TIME.
Check settings in ISM_CONF screen.
Check ISM_HIST screen.
Check current transformer wiring leading to ISM terminal block J4.
Verify phase to phase and phase to ground line voltage.
Check wiring and hardware between building power supply and motor.
Current imbalance may improve if power or motor leads are rotated
in the same phase sequence.
Voltage Imbalance > VOLTAGE % IMBALANCE for greater than the
VOLTAGE IMBALANCE TIME.
Check settings in ISM_CONF screen.
Check ISM_HIST screen.
Check line voltage wiring leading to ISM terminal block J3.
Verify phase to phase and phase to ground line voltage. Check wiring
and hardware between building power supply and motor.
Any phase current > 108% RLA for excessive time period.
Alarm can result from significant load side current imbalance when
running at full load.
Check ISM_HIST screen.
Check for consistent entering condenser water temperature and water
flow rates.
Check MOTOR RATED LOAD AMPS and STARTER LRA RATING in
ISM_CONF screen.
VFD applications only: Any phase current > 120% for excessive time
period.
Any LINE CURRENT > MOTOR LOCKED ROTOR TRIP for excessive
time while running after the LOCKED ROTOR START DELAY has expired.
Check MOTOR LOCKED ROTOR TRIP and MOTOR CURRENT CT
RATIO in ISM_CONF screen.
Check motor nameplate data. Check ISM_HIST screen.
Check motor wiring and motor winding resistance.
Temporarily enable SINGLE CYCLE DROP OUT to capture power
disturbances.
Any LINE CURRENT > MOTOR LOCKED ROTOR TRIP for excessive
time while running after the LOCKED ROTOR START DELAY has expired.
Check MOTOR LOCKED ROTOR TRIP and MOTOR CURRENT CT
RATIO in ISM_CONF screen.
Check motor nameplate data. Check ISM_HIST screen.
Check motor wiring and motor winding resistance.
Temporarily enable SINGLE CYCLE DROP OUT to capture power
disturbances.
Any GROUND FAULT current > GROUND FAULT CURRENT threshold
for a duration > GROUND FAULT PERSISTENCE after the GROUND
FAULT START DELAY has expired.
Check these settings and GROUND FAULT CT RATIO in ISM_CONF
screen.
Check ISM_HIST screen.
Confirm that ground fault current transformer orientation is correct and
that the correct motor leads have been routed through the ground fault
current transformers in the right direction.
Check for condensation on motor terminals or inside of motor leads.
Check motor power leads for phase to phase or phase to ground shorts.
Disconnect motor from starter and merger motor windings to ground
and phase to phase. Call Carrier Service.
The ISM has detected that the input power is phased BAC instead of
ABC.
Confirm that the phase sequence wired to ISM terminal block J3 is
consistent with the power wiring to the starter.
Swap two power leads at the starter.
LINE FREQUENCY FAULTING in ISM_CONF screen is enabled and the
LINE FREQUENCY has deviated approximately 7% from nominal value.
Check ISM_HIST screen. Check FREQUENCY = 60 HZ? In ISM_CONF
screen. Check line frequency.
If operating from a generator, check generator size and speed.
AUTO RESTART OPTION in OPTIONS screen is disabled and there
was a temporary loss of 115 V ISM control voltage supply.
Check ISM_HIST screen.
Check wiring leading to ISM terminals J1-LL1 and J1-LL2.
Check control power circuit breaker, control power transformer and
control power circuit fuses.
Monitor chiller utility power for disruptions. Improve ISM ground
connection, apply measures to reduce electrical noise to ISM.
Consult power company.
Check 1M dry contact input
Check 2M dry contact input
Check high pressure switch and oil pump for legacy chiller and oil
pump for NGC chiller
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