What causes fault code VFD-CL1 (VFD Communication Loss)?

Network cable disconnected or damaged — check both ends. Communication module not seated properly in drive slot. Network node address conflict — two devices with same address. PLC scanner module fault — check scanner status. Baud rate mismatch between drive and network. Termination resistor missing on last device in network

How do I fix fault code VFD-CL1?

Check network cable connections at drive and PLC/switch — reseat both ends. Verify communication module is fully seated and locked in drive. Check network LED indicators — link/activity lights should be solid/blinking. Verify drive node address is unique — check against network device list. Confirm baud rate/speed setting matches network configuration. For Modbus/serial: check wiring polarity (A/B), termination on last device. For EtherNet/IP: verify IP address, subnet, gateway settings

VFD Communication Loss

VFD-CL1

Drive lost communication with PLC or network controller. Commands cannot be sent or received over the fieldbus.

high vfd conveyor packaging

vfd communication ethernet modbus network plc

Probable Causes (ranked)

Network cable disconnected or damaged — check both ends
Communication module not seated properly in drive slot
Network node address conflict — two devices with same address
PLC scanner module fault — check scanner status
Baud rate mismatch between drive and network
Termination resistor missing on last device in network

Fix Steps

1 Check network cable connections at drive and PLC/switch — reseat both ends
2 Verify communication module is fully seated and locked in drive
3 Check network LED indicators — link/activity lights should be solid/blinking
4 Verify drive node address is unique — check against network device list
5 Confirm baud rate/speed setting matches network configuration
6 For Modbus/serial: check wiring polarity (A/B), termination on last device
7 For EtherNet/IP: verify IP address, subnet, gateway settings

Field Trick

Swap to local control mode on the drive keypad. If motor runs fine in local, the problem is 100% communication — not the drive or motor.

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