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Table 5 — ICVC Alarm Codes (cont)
CHILLER PROTECTIVE LIMIT FAULTS (cont)
*[LIMIT] is shown on the ICVC as the temperature, pressure, voltage, etc., set point 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.
ICVC FAULT
STATE
PRIMARY
MESSAGE
SECONDARY
MESSAGE
PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
245 PROTECTIVE LIMIT HIGH VFD SPEED 245Actual 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 DIFFUSER
CONFIG.
246Diffuser Control Invalid
Configuration: Check SETUP2
Entries.
Check 25%, 50%, and 75% Guide Vane and Dif-
fuser Load Point entries in SETUP2 screen.
247 PROTECTIVE LIMIT DIFFUSER POSITION
FAULT
247Diffuser Position Fault:
Check Guide Vane/Diffuser
Actuator.
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 sched-
ule 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 4.3k ohm resistor between CCM termi-
nals J3-7 and J3-8.
Check for electrical noise in CCM Diffuser Pres-
sure wiring. Do not continue to operate com-
pressor except for diagnostic purposes.
248 PROTECTIVE LIMIT SPARE TEMPERATURE
#1
248Spare Temperature #1
[VALUE] exceeded limit of
[LIMIT]*.
Check Spare Temperature Enable and Spare
Temperature Limit in SETUP1 Screen.
249 PROTECTIVE LIMIT SPARE TEMPERATURE
#2
249Spare Temperature #2
[VALUE] exceeded limit of
[LIMIT]*.
Check Spare Temperature Enable and Spare
Temperature Limit in SETUP1 Screen.
250 UNUSED UNUSED 250Unused State.
251 PROTECTIVE LIMIT VFD CONFIG CONFLICT 251VFD 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 soft-
ware 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 252VFD 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
253Guide 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 feed-
back voltage is < .045 or > 3.15 VDC.
254 PROTECTIVE LIMIT VFD CHECKSUM ERROR 254Checksum Error:
Press Reset to Restore
Configuration
Actual VFD checksum does not match calcu-
lated value.
255 PROTECTIVE LIMIT VFD DEW PREVENTION 255Dew Prevention - Cool-
ant Too Cold. Check Solenoid
& Cond T.
VFD COLDPLATE TEMP is too close to dew
point based on VFD ENCLOSURE TEMP and
RELATIVE 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 256Inductor Overtemp Trip -
Check Temp Switch and Cool-
ing Fans.
Check for cooling fan air flow obstructions.
257 PROTECTIVE LIMIT VFD START INHIBIT 257VFD 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 258Unused.