• Verify that the power supply is energized and is using the appropriate input control power.
• Measure the output voltage and confirm whether the output level is below the trip level.
• Verify that the fault detection wiring is per the drawings, and measure the voltage on the
trip signals. For example, Terminal J18 2-3 is 5Vdc when healthy, and 0V in a faulted state.
• Verify that the power supply internal cooling fan is operational, cycle control power if
needed.
• If the cooling fan is not operational, replace the power supply.
• Check parameter 121 in the Metering group of the drive variables to view the measured
DC voltage.
Speak to a sales manager for best pricing & lead time:
Sales manager : Tiffany Guan 
Mobile / WhatsApp : + 86 18030235313
Email: sales2@mooreplc.com 
Skype : dddemi33
