Carrier 19XRV Start-Up And Service Instructions page 18

CHILLER PROTECTIVE LIMIT FAULTS (cont)
ICVC FAULT PRIMARY
STATE MESSAGE
245 PROTECTIVE LIMIT HIGH VFD SPEED
246 PROTECTIVE LIMIT INVALID DIFFUSER
247 PROTECTIVE LIMIT DIFFUSER POSITION
248 PROTECTIVE LIMIT SPARE TEMPERATURE
249 PROTECTIVE LIMIT SPARE TEMPERATURE
250 UNUSED
251 PROTECTIVE LIMIT VFD CONFIG CONFLICT
252 PROTECTIVE LIMIT VFD CONFIG CONFLICT
253 PROTECTIVE LIMIT GUIDE VANE
254 PROTECTIVE LIMIT VFD CHECKSUM ERROR 254Checksum Error:
255 PROTECTIVE LIMIT VFD DEW PREVENTION
256 PROTECTIVE LIMIT INDUCTOR OVERTEMP
257 PROTECTIVE LIMIT VFD START INHIBIT
258 UNUSED STATE
*[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.
Table 5 — ICVC Alarm Codes (cont)
SECONDARY
MESSAGE
245Actual VFD Speed
exceeded limit of Target VFD
Speed + 10%.
246Diffuser Control Invalid
CONFIG. Configuration: Check SETUP2
Entries.
247Diffuser Position Fault:
FAULT Check Guide Vane/Diffuser
Actuator.
248Spare Temperature #1
#1 [VALUE] exceeded limit of
[LIMIT]*.
249Spare Temperature #2
#2 [VALUE] exceeded limit of
[LIMIT]*.
UNUSED 250Unused State.
251VFD Config Conflict
(VFD Uploaded): Verify to
Reset Alarm.
252VFD Config Conflict
(VFD Downloaded): Verify to
Reset Alarm.
253Guide Vane Fault
CALIBRATION [VALUE]. Check Calibration.
Press Reset to Restore
Configuration
255Dew Prevention - Cool-
ant Too Cold. Check Solenoid
& Cond T.
256Inductor Overtemp Trip -
Check Temp Switch and Cool-
ing Fans.
257VFD Start Inhibit: Check
VFD Diagnostic Parameters
212/214.
UNUSED 258Unused.
PRIMARY CAUSE
Actual VFD Speed on COMPRESS screen must
not exceed Target VFD Speed by more than
10%.
Check 25%, 50%, and 75% Guide Vane and Dif-
fuser Load Point entries in SETUP2 screen.
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.
Check Spare Temperature Enable and Spare
Temperature Limit in SETUP1 Screen.
Check Spare Temperature Enable and Spare
Temperature Limit in SETUP1 Screen.
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.
The VFD_CONF table in the Gateway does not
match that which is in the ICVC.
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.
Actual VFD checksum does not match calcu-
lated value.
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.
Check for cooling fan air flow obstructions.
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.
18
ADDITIONAL CAUSE/REMEDY