Table 5 — ICVC Alarm Codes (cont)
CHILLER PROTECTIVE LIMIT FAULTS (cont)
ICVC FAULT | PRIMARY | SECONDARY | PRIMARY CAUSE | ADDITIONAL CAUSE/REMEDY | |
STATE | MESSAGE | MESSAGE | |||
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| ||||
245 | PROTECTIVE LIMIT | HIGH VFD SPEED | 245→Actual VFD Speed | Actual VFD Speed on COMPRESS screen must | |
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| exceeded limit of Target VFD | not exceed Target VFD Speed by more than | |
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| Speed + 10%. | 10%. | |
246 | PROTECTIVE LIMIT | INVALID DIFFUSER | 246→Diffuser Control Invalid | Check 25%, 50%, and 75% Guide Vane and Dif- | |
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| CONFIG. | Configuration: Check SETUP2 | fuser Load Point entries in SETUP2 screen. | |
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| Entries. |
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247 | PROTECTIVE LIMIT | DIFFUSER POSITION | 247→Diffuser Position Fault: | Confirm that Diffuser Option in SETUP 2 screen | |
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| FAULT | Check Guide Vane/Diffuser | has not been Enabled if compressor does not | |
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| Actuator. | have a split ring diffuser. May indicate rotating | |
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| stall condition. | |
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| Check rotating stall transducer wiring accuracy | |
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| and sealing. | |
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| Check diffuser schedule and guide vane sched- | |
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| ule in SETUP2 screen. | |
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| Check for proper operation of diffuser and inlet | |
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| guide vane actuators including inlet guide vane | |
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| calibration. | |
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| Check diffuser actuator coupling for rotational | |
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| slip. | |
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| Check RC snubber on CCM | |
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| Check 4.3k ohm resistor between CCM termi- | |
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| nals | |
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| Check for electrical noise in CCM Diffuser Pres- | |
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| sure wiring. Do not continue to operate com- | |
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| pressor except for diagnostic purposes. | |
248 | PROTECTIVE LIMIT | SPARE TEMPERATURE | 248→Spare Temperature #1 | Check Spare Temperature Enable and Spare | |
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| #1 | [VALUE] exceeded limit of | Temperature Limit in SETUP1 Screen. | |
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| [LIMIT]*. |
| |
249 | PROTECTIVE LIMIT | SPARE TEMPERATURE | 249→Spare Temperature #2 | Check Spare Temperature Enable and Spare | |
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| #2 | [VALUE] exceeded limit of | Temperature Limit in SETUP1 Screen. | |
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| [LIMIT]*. |
| |
250 | UNUSED | UNUSED | 250→Unused State. |
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251 | PROTECTIVE LIMIT | VFD CONFIG CONFLICT | 251→VFD Config Conflict | The VFD_CONF table in the Gateway does not | |
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| (VFD Uploaded): Verify to | match that which is in the ICVC. This is a normal | |
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| Reset Alarm. | fault if an ICVC has been uploaded with soft- | |
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| ware when it was not attached to the CCM. | |
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| Enter VFD_CONF screen and then exit | |
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| VFD_CONF screen by pressing EXIT then | |
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| CANCEL. | |
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| press EXIT then SAVE. Parameters stored in | |
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| the Gateway will be uploaded into the ICVC. | |
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| Confirm valid settings in VFD_CONF screen. | |
252 | PROTECTIVE LIMIT | VFD CONFIG CONFLICT | 252→VFD Config Conflict | The VFD_CONF table in the Gateway does not | |
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| (VFD Downloaded): Verify to | match that which is in the ICVC. | |
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| Reset Alarm. |
| |
253 | PROTECTIVE LIMIT | GUIDE VANE | 253→Guide Vane Fault | Enter CONTROL TEST and execute Guide | |
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| CALIBRATION | [VALUE]. Check Calibration. | Vane Calibration. | |
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| Check CCM guide vane feedback terminals | |
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| and | |
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| Check guide vane feedback potentiometer. | |
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| Alarm before start indicates guide vane opening | |
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| is not less than 4%. Alarm running indicates | |
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| guide vane position is < | |
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| back voltage is < .045 or > 3.15 VDC. | |
254 | PROTECTIVE LIMIT | VFD CHECKSUM ERROR | 254→Checksum Error: | Actual VFD checksum does not match calcu- | |
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| Press Reset to Restore | lated value. | |
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| Configuration. |
| |
255 | PROTECTIVE LIMIT | VFD DEW PREVENTION | 255→Dew Prevention - Cool- | VFD COLDPLATE TEMP is too close to dew | |
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| ant Too Cold. Check Solenoid | point based on VFD ENCLOSURE TEMP and | |
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| & Cond T. | RELATIVE HUMIDITY in POWER screen. | |
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| Check for moisture in VFD enclosure. | |
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| Check Humidity Sensor in CONTROLS TEST. | |
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| Check for contamination on CCM | |
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| Humidity Sensor. | |
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| Check that VFD refrigerant cooling modulating | |
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| valve is closing. | |
256 | PROTECTIVE LIMIT | INDUCTOR OVERTEMP | 256→Inductor Overtemp Trip - | Check for cooling fan air flow obstructions. | |
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| Check Temp Switch and Cool- |
| |
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| ing Fans. |
| |
257 | PROTECTIVE LIMIT | VFD START INHIBIT | 257→VFD Start Inhibit: Check | The VFD Start Inhibit is derived from the Alarm | |
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| VFD Diagnostic Parameters | bit being set in the VFD. The conditions causing | |
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| 212/214. | the alarm must be corrected in the VFD to | |
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| enable subsequent starts and operation. See | |
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| VFD parameters 212/214. | |
258 | UNUSED STATE | UNUSED | 258→Unused. |
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*[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.
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