Trane IntelliPak CGAF Series - Page 55

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System Testing & Troubleshooting
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
GBAS 0-5VDC Module Comm Failure Problem: The CGM has lost communications with the GBAS Module. Check: Check field/unit wiring between CGM and GBAS.
The CGM has lost communications with the GBAS Module.
The UCM will initiate the following actions; a. If the Demand Limit input was closed prior to communications loss, then the Demand Limit commands issued to the Compressor Staging function will be cancelled. b. If any of the GBAS setpoint control parameters are the HI-selected setpoint sources, then those setpoints will revert to the default HI setpoints. c. Any active GBAS output control parameters will be ignored. d. A failsafe function in the GBAS module will cause all GBAS outputs to be zeroed and de-ener
g
ized.
(PAR) An automatic reset occurs after communication has been restored.
GBAS 0-5VDC Module Comm Failure Problem: The CGM has lost communications with the GBAS Module. Check: Check field/unit wiring between CGM and GBAS.
The CGM has lost communications with the GBAS Module.
The UCM will initiate the following actions; a. If the Demand Limit input was closed prior to communications loss, then the Demand Limit commands issued to the Compressor Staging function will be cancelled. b. If any of the GBAS setpoint control parameters are the HI-selected setpoint sources, then those setpoints will revert to the default HI setpoints. c. Any active GBAS output control parameters will be ignored. d. A failsafe function in the GBAS module will cause all GBAS outputs to be zeroed and de-ener
g
ized.
(PAR) An automatic reset occurs after communication has been restored.