This morning when I went to start HV conditioning CP2 and CP3 both had faults and the temperature of the water was ~27C. I reset the compressors by flipping the system reset switch. This cleared the fault and allowed the compressors to come one. To the best of my knowledge these faults happen as a result of compressor fluid pressure too low or high and temperature too low or high and lack of flow. The system cannot determine which one it was that caused the trip. The system restarted and faulted again. As I was watching this time it can be determined that the fault was the result of an over temperature event. This was the caused by the cooling fans not coming on. Which was traced to the fan VFD controllers which both read OP3 which is an Over voltage during constant speed operation. The operating manual lists these as the possible causes

The input voltage is fluctuating abnormally.

• Power network is greater than 200 kVA

• Power factor capacitor switching

• SCR switching on power network

• The drive controller is regenerating— the load causes the motor to run at a frequency higher than drive controller output frequency.

• Intermittent output phase fault

The proposed solutions are

• Install a line reactor.

• Check the input and output circuits for phase failure and rectify. 

I will continue to monitor over the next few days to see if this continues to happen. If it does I will contact ESC.