Compressor Drive fault

[shahzad.engr123_apc]

Dear team,

We are using acrp102 cooling unit, suddenly it is showing alarm of Compressor Drive fault but it becomes normal after automatic/forceful restart.please find the attached logs and guide us.

Your prompt response will be highly appreciated.

Regards

MS

[BillP · Accepted solution]

Hello Muhammad.

From the event logs I see the unit is experiencing a lot of cold starts. Unless this is someone manually flipping the breaker on the unit, I would suggest checking the incoming power to the unit. If there are fluxuations in the power coming in, this would cause the cold starts and could cause the compressor drive alarms.

A System Coldstart event indicates that the NMC (Network Management Card) has just been powered and has completed startup.

• Power interruption to the NMC - If a device powering the NMC suffers an interruption of power, the NMC will restart when power is reapplied to that device.

The alarm codes on the vfd that you sent in have to do with the high head pressure switch. You should check that the condenser is working properly to get rid of the heat and check the connections to and from the high head pressure switch.

Thank you

[shahzad.engr123_apc]

Thanks alot

[shahzad.engr123_apc]

Dear L2SupportServices,

But there is another cooling unit installed in same location which is working fine, there is no error on that unit.

Regards

MS

[msg4t]

I have a piece of equipment that periodically gives the following alarm: "compressor drive fault". When the unit is checked, a reset is performed and the equipment returns to operation. Electrical inspection of the equipment's power supply has been done, and everything appears normal. What could cause this alarm? Could it be an indication of a fault in the compressor or the drive? An alarm for speed was also identified on the inverter. This happens over long periods of time, occurring every few weeks.

[Hakoven]

@msg4t Hi,

Please check your compessor electrical resistance and make buzzer (short circuit) test. 

I think your compressor has a wiring damage inside the comp. If you don't know how you can do it, check below:

*Closed main energy circuit breaker on the electrical panel (be sure no energy),

*Remove R-S-T phases cabble on the compressor connection,

*Use any multimeter with "ohm" mesaurement,

* Check R-S / R-T / S-T connetion resistance (ıts must be between1.9 to 3.0 k.ohm)

*After the checking resistance, go to diode (buzzer) stage on multimeter,

*Check between electrical connection port (R-S-T) and copper pipe any short circuit or not. 

*Check between electrical connection port (R-S-T) and gruond connettion. When you try see rezistance its must be show "OL" mean open loop on the multimeter screen. Also when you try see buzzer (short circuit) it's must be no buzzer sound. 

The resistance resistance at the R-S-T connection terminals of the compressor should be the same or close. Also, the R-S-T terminals should not be short-circuited with the body or ground. If any of these are present, the compressor will fail completely in the near future.