Yaskawa Error Code H66 !exclusive!

A Yaskawa V1000 drive controlling a cut-to-length feeder tripped on H66 every 20–30 cuts.

If your Yaskawa drive has suddenly stopped, displaying “H66” on the keypad, you are likely dealing with a fault that is often misunderstood. In many Yaskawa drive models (particularly the A1000, V1000, J1000, and GA700 series), H66 is classified under or Overshoot Detection Alarm .

: Remove the external fault cause and then press the RESET button on the keypad or cycle the power. yaskawa error code h66

For more detailed technical data or model-specific wiring diagrams, refer to the Yaskawa V1000 Technical Manual or use DriveWizard software for real-time diagnostics. 6.3 Drive Alarms, Faults, and Errors

Several factors can lead to this issue. It is rarely a failure of the main motor itself, but rather the intelligence connecting it. 1. Faulty Option Module Connection A Yaskawa V1000 drive controlling a cut-to-length feeder

Reconnect power and access the VFD keypad to check communication parameters (typically in the group for network options):

The H66 error code is a specific fault code displayed on Yaskawa drives, indicating a problem with the motor or the drive's output stage. This error code typically appears on Yaskawa VFDs, such as the A1, A2, or A3 series. : Remove the external fault cause and then

Check the PLC diagnostic buffer. Is the PLC actively trying to communicate with the VFD node?

High-voltage motor cables running too close to communication cables can induce noise, corrupting data packets.

Ensure that all communication and encoder cables use twisted-pair, shielded wiring. The shield must be properly grounded at the drive end.

Because H66 is a programming conflict rather than a physical hardware failure, it can be resolved completely via the digital operator panel.