Section 5 – SR-2 Diagnostics
38 ELECTRIC PHASE REVERSED
Page 1 of 2
Alarm Type
A Shutdown Alarm if unit is running in electric mode
A Log Alarm if unit is switched from electric mode to diesel mode
Associated Alarm
Codes
Alarm Code 90 Electric Overload
How Alarm is Set
Two phases are reversed on 3 phase standby power or the motor is mis-wired, causing the compressor and
condenser fan to rotate in the wrong direction.
How Alarm is Cleared
This alarm is cleared manually.
Diagnostic Procedure
1. Check motor wiring to be sure phase rotation is correct.
2. Confirm that the 7EC-01 wire is connected to the MCB motor contactor and the 7EB-01 wire is connected to the
MCA motor contactor.
3. Check the voltages at the phase detect module. Battery voltage should be present on the 7EA wire and the 8
wire.
4. Check the standby power voltage at the phase detect module. Standby power should be available at L1, L2
and L3.
5. Confirm that the phase wiring between contactor MCA and MCB is correct.
39 CHECK WATER VALVE CIRCUIT
Page 1 of 1
Alarm Type
Check Alarm
Considerations
Not implemented – future use.
5-46
02 February 2005
To Next Page
Loading...
