38
ALM-409
ISM Fault -
Ground Fault
Manual
Unit shuts down.
Alarm relay turns on.
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.
ALM-410
ISM Fault -
Phase Reversal
Trip
Manual
Unit shuts down.
Alarm relay turns on.
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.
ALM-411
ISM Fault - Line
Frequency Trip
Manual
Unit shuts down.
Alarm relay turns on.
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.
ALM-412
ISM Fault -
Starter Module
Reset
Manual
Unit shuts down.
Alarm relay turns on.
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.
ALM-413
ISM Fault - Start
Contact Fault
Manual
Unit shuts down.
Alarm relay turns on. Check 1M dry contact input
ALM-414
ISM Fault -
Transition
Contact Fault
Manual
Unit shuts down.
Alarm relay turns on. Check 2M dry contact input
ALM-415
ISM Fault - OIl
Pump / HPS
Failure
Manual
Unit shuts down.
Alarm relay turns on.
Check high pressure switch and oil pump for legacy chiller and oil pump
for NGC chiller
ALM-416
ISM Fault -
Starter Fault
Manual
Unit shuts down.
Alarm relay turns on.
The ISM has received a start command and the starter has declared a
Fault. The dry contacts connected to ISM J2-7 and J2-8 are open. See
starter display for starter Fault Code. For Benshaw Inc. RediStart
starters, view RediStart MICRO display. For VFD, check VFD display
Fault History. Clear VFD faults with VFD keypad. For Allen-Bradley wye
delta starters with RLA > 718 A, the TR3 timer may have expired as a
result of a delayed transition.
ALM-417
ISM Fault - Motor
Amps Not
Sensed
Manual
Unit shuts down.
Alarm relay turns on.
The ISM has not sensed sufficient current for an excessive delay after
1M has closed. If LF1, verify J4 jumper on regulator card is on pins 1
and 2 (4-20mA). Check the MOTOR CURRENT CT RATIO and the
MOTOR RATED LOAD AMPS in the ISM_CONF screen. Check VFD
OPTION in SETUP 2 screen. Check for wiring of current transformers to
the J4 ISM terminals. Check if main circuit breaker has tripped. Check
ISM_HIST screen.
ALM-418
ISM Fault -
Excessive
Acceleration
Time
Manual
Unit shuts down.
Alarm relay turns on.
Any line current remains high for an excessive time duration following
1M aux and either 2M aux or transition contact closure. Check that inlet
guide vanes are fully closed at start up. Check ISM_HIST screen.
Check Motor Rated Load Amps in ISM_CONF screen. Reduce
condenser pressure if possible.
ALM-419
ISM Fault -
Excessive Motor
Amps
Manual
Unit shuts down.
Alarm relay turns on.
AVERAGE LINE CURRENT > 110% for an excessive amount of time.
Check MOTOR RATED LOAD AMPS and MOTOR CURRENT CT
RATIO in ISM_CONF time. Check ISM_HIST screen. Check for
conditions that cause excessive lift. Check guide vane actuator for
proper operation. Confirm that guide vanes will fully close prior to start-
up.
ALM-420
ISM Fault - Start
Transition
Contact Fault
Manual
Unit shuts down.
Alarm relay turns on. Check 1M and 2M dry contact inputs
ALM-421
ISM Fault - Motor
Amps When
Stopped
Manual
Unit shuts down.
Alarm relay turns on.
High line current measured on any phase after power up or STOP
command. Check the MOTOR CURRENT CT RATIO and the MOTOR
RATED LOAD AMPS in the ISM_CONF screen. Check VFD OPTION in
SETUP 2 screen. Check ISM_HIST screen. Check for high inrush
current during power-up. Confirm that the starter de-energizes the motor
when the ISM removes 115V from ISM J9-2. Confirm that the correct
STARTER TYPE has been selected in the ISM_CONF screen.
ALM-422
ISM Fault -
Starter Module
Failure
Manual
Unit shuts down.
Alarm relay turns on. Check ISM Hardware
ALM-423
ISM Fault -
Calibration
Factor Error
Manual
Unit shuts down.
Alarm relay turns on. Check ISM Calibration Values
Table 16 — PIC6 Alarm Codes* (cont)
ALARM CODE
DESCRIPTION
OF ALARM TEXT
RESET TYPE
ACTION TAKEN BY
THE CONTROL
POSSIBLE CAUSE
