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6
Table 10 - Alarm and alert messages (continued)
I. CHILLER PROTECTIVE LIMIT FAULTS (continued)
ICVC
FAULT
STATE
PRIMARY MESSAGE SECONDARY
MESSAGE
ALARM MESSAGE PRIMARY
CAUSE
ADDITIONAL CAUSE/REMEDY
243
POTENTIAL FREEZE-
UP
EVAP PRESS/TEMP
TOO LOW
243->Evaporator Refrig Temp
[VALUE] exceeded limit of [LIMIT]*.
Check for proper refrigerant charge.
Check float valve operation.
Check for proper fluid flow and temperature.
Confirm that condenser water enters bottom row of condenser tubes first.
Check Evaporator Refrigerant Temperature sensor.
Check for division plate gasket bypass.
Check for fouled tubes.
244
POTENTIAL FREEZE-
UP
COND PRESS/TEMP
TOO LOW
244->Condenser Refrig Temp
[VALUE] exceeded limit of [LIMIT]*.
Condenser water too cold or chiller shut down with brine below 0°C in
cooler so equalization temperature in chiller approached 0°C.
Check condenser pressure transducer.
Check refrigerant charge.
245
PROTECTIVE LIMIT HIGH VFD SPEED
245->Actual VFD Speed exceeded
limit of Target VFD Speed ± 10%]*.
Actual VFD Speed on COMPRESS screen must not exceed Target VFD
Speed by more than 10%.
246
PROTECTIVE LIMIT INVALID DIFUSER
CONFIG.
246->Diffuser Control Invalid Con-
figuration: Check SETUP2 Entries
Check 25%, 50%, and 75% Guide Vane and Diffuser Load Point entries
in SETUP2 screen.
247
PROTECTIVE LIMIT DIFFUSER
POSITION FAULT
247->Diffuser Position Fault: Check
Guide Vane/Diffuser Actuators
Confirm that Diffuser Option in SETUP 2 screen has not been Enabled if
compressor does not have a split ring diffuser. May indicate rotating stall
condition.
Check rotating stall transducer wiring, accuracy and sealing.
Check diffuser schedule and guide vane schedule in SETUP2 screen.
Check for proper operation of diffuser and inlet guide vane actuators
including inlet guide vane calibration.
Check diffuser actuator coupling for rotational slip.
Check RC snubber on CCM J4-23 and J4-24.
Check 4.3 kOhm resistor between CCM terminals J3-7 and J3-8.
Check for electrical noise in CCM Diffuser Pressure wiring. Do not continue
to operate compressor except for diagnostic purposes.
248
PROTECTIVE LIMIT SPARE
TEMPERATURE #1
248->Spare Temperature #1
[VALUE] exceeded limit of [LIMIT]*.
Check Spare Temperature Enable and Spare Temperature Limit in
SETUP1 Screen.
249
PROTECTIVE LIMIT SPARE
TEMPERATURE #2
249->Spare Temperature #2
[VALUE] exceeded limit of [LIMIT]*.
Check component that SPARE TEMPERATURE #2 is Check Spare
Temperature Enable and Spare Temperature Limit in SETUP1 Screen.
250
UNUSED
UNUSED
250->Unused state
251
PROTECTIVE LIMIT VFD CONFIG
CONFLICT
251->VFD Config Conflict (VFD
Uploaded); Verify to Reset Alarm.
The VFD_CONF table in the Gateway does not match that which is in the
ICVC. This is a normal fault if an ICVC has been uploaded with software
when it was not attached to the CCM. Enter VFD_CONF screen and
then exit VFD_CONF screen by pressing EXIT then CANCEL. Re-enter
the VFD_CONF screen, press EXIT then SAVE. Parameters stored in
the Gateway will be uploaded into the ICVC. Confirm valid settings in
VFD_CONF screen.
252
PROTECTIVE LIMIT VFD CONFIG
CONFLICT
252->VFD Config Conflict (VFD
Downloaded); Verify to Reset Alarm.
The VFD_CONF table in the Gateway does not match that which is in
the ICVC.
253
PROTECTIVE LIMIT GUIDE VANE
CALIBRATION
253->Guide Vane Fault [VALUE].
Check Calibration
Enter CONTROL TEST and execute Guide Vane Calibration.
Check CCM guide vane feedback terminals J4-9 and J4-10.
Check guide vane feedback potentiometer. Alarm before start indicates
guide vane opening is not less than 4%. Alarm running indicates guide
vane position is < -1% or > 103%, or feedback voltage is < 0.045 or
> 3.15 V d.c.
254
PROTECTIVE LIMIT VFD CHECKSUM
ERROR
254->Checksum Error: Press Reset
to Restore Configuration
Actual VFD checksum does not match calculated value.
255
PROTECTIVE LIMIT VFD DEW
PREVENTION
255->VFD Dew Prevention - VFD
Coolant too Cold, Check Solenoid
and Cond T
VFD COLDPLATE TEMP is too close to dew point based on VFD
ENCLOSURE TEMP and RELA¬TIVE HUMIDITY in POWER screen.
Check for moisture in VFD enclosure.
Check Humidity Sensor in CONTROLS TEST.
Check for contamination on CCM J3-7 and J3-9 Humidity Sensor.
Check that VFD refrigerant cooling modulating valve is closing.
256
PROTECTIVE LIMIT INDUCTOR
OVERTEMP
256->Inductor Overtemp Trip - Check
Temp Switch and Cooling Fans
Check for cooling fan air flow obstructions.
257
PROTECTIVE LIMIT VFD START INHIBIT 257->VFD Start Inhibit: Check VFD
Diagnostic Parameters 212/214.
The VFD Start Inhibit is derived from the Alarm bit being set in the VFD.
The conditions causing the alarm must be corrected in the VFD to
enable subsequent starts and operation. See VFD parameters 212/214.
258
UNUSED STATE
UNUSED
258->Unused
259
PROTECTIVE LIMIT CCN OVERRIDE
STOP
259->CCN Emergency/Override
Stop.
CCN has signaled the chiller to stop.This fault must be manually reset
from the default screen of the ICVC.
282
PROTECTIVE LIMIT INVALID VFD
CONFIG
282->Line Frequency [VALUE]
Exceeded Configuration Range.
LINE FREQUENCY in POWER screen must be maintained between 45-
52 Hz if LINE FREQ=60Hz? is set to NO (50 Hz). LINE FREQUENCY
must be maintained between 55-62 Hz if LINE FREQ=60Hz? is set to
YES (60 Hz).
Check 2C AUX/HPR Gate Kill circuit.
283
PROTECTIVE LIMIT INVALID VFD
CONFIG
283->Compressor 100%
Speed Config Ranges: 50=Hz
45-52; 60 Hz=55-62.
COMPRESSOR 100% SPEED in VFD_CONF screen must be set
between 45-52 Hz if LINE FREQ=60Hz? is set to NO (50 Hz).
COMPRESSOR 100% SPEED must be set between
55-62 Hz if LINE FREQ=60Hz? is set to YES (60 Hz).
284
VFD GATEWAY
COMPATIBILITY
CONFLICT
284->VFD Gateway Compatibil¬ity
Conflict: Check VFG/VFD Versions.
VFD Gateway and VFD software versions are not compatible.
Call Carrier Service.
285
VFD GATEWAY
COMPATIBILITY
CONFLICT
285->VFD Gateway Compatibil¬ity
Conflict: Check VFG/ICVC Versions.
VFD Gateway and ICVC software versions are not compatible.
Call Carrier Service.
286
PROTECTIVE LIMIT
INVERTER
OVERCURRENT
286->Inverter Overcurrent Fault:
Check VFD Status.
Check for high entering water temperature or low condenser water flow.
Check current settings in VFD_CONF screen.
* [LIMIT] is shown on the ICVC as the temperature, pressure, voltage, etc., setpoint predefined or selected by the operator as an override, alert, or alarm condition.
[VALUE] is the actual pressure, temperature, voltage, etc., at which the control tripped.