A CE (Communications Error) fault indicates no control data was received from the connected PLC when using serial communications. Typically this fault occurs when a drive is communicating with a PLC via Modbus, BACnet MS/TP, Apogee, or Metasys and communication is lost for the duration of time set in parameter H5-09.

Note: A CE fault may often be referred to as a Serial Comm Error.

Refer to the below recommendations when troubleshooting a CE (Communications Error) fault:

• For minor interruptions, increase the CE Detection Time in parameter H5-09.
  • Note: It is recommend to increase this setting when several drives are on the same network
• Inspect the connections for poor shielding or faulty communication wiring.
• Separate communication wires from high voltage wires such as motor power or incoming voltage power cables.
• If noise is a known issue, add an EMC filter to help reduce any induced electrical noise.
• If intermittent CE faults are occurring, refer to the document below:
  • BACnet MS/TP, Modbus (RS-485), Apogee, and Metasys Communication Wiring, Recommended Shield Termination Points and Sudden Loss of Communication
• For testing the drive's communications circuit, perform a self-diagnostic communication test. Refer to the documents below:
  • Modbus, Metasys, Apogee, and BACnet MS/TP Self-Diagnostic Test for HV600, FP605 and Z1000 Drives
  • Modbus Self-Diagnostic Test for GA800, U1000, A1000, P1000, and iQpump1000 Drives
  • Modbus Self-Diagnostic Test for V1000 and iQpump Micro Drives