Yaskawa Error Code H66

Navigate to the parameters on the digital operator to view the status of the digital inputs.

Observed symptoms

Possible causes (ranked)

Periodically check the tightness of mounting screws and terminal connections inside the drive during planned shutdowns.

: The dynamic braking circuit cannot burn off the regenerative energy. yaskawa error code h66

Industrial environments subject drives to constant vibration. Over time, the physical connection between the drive’s main control board and the option card can loosen, causing intermittent data loss. 2. Electrical Noise and Interference (EMI/RFI)

: In some cases, multi-function output settings may be incorrectly identifying a minor temperature warning as a major fault. Yaskawa America Troubleshooting Steps Check Deceleration Time : Increase the deceleration time (parameter Navigate to the parameters on the digital operator

: High incoming utility voltage or sudden grid surges can push the resting DC bus voltage up, leaving zero head-room for normal motor deceleration. Diagnostic Workflow Clear the fault manually using the keypad.

What (e.g., GA700, A1000) are you using? Industrial environments subject drives to constant vibration

Check that the cable shields are grounded correctly at the designated ground clamps on the drive.