Yaskawa Error Code H66 -

The key takeaway: The drive believes the motor is not following the commanded trajectory accurately.

If you encounter H66, follow this sequence to minimize downtime:

Temporarily reset the fault (press RESET or cycle power). Then run the system at 50% speed/load. Does H66 return? If yes, proceed. If no, the issue is load-dependent. yaskawa error code h66

If you have exhausted all the steps above and H66 persists, professional intervention is needed. Contact Yaskawa support with the following ready:

Yaskawa’s engineering team can provide a custom parameter file or identify a hardware defect (e.g., failed current sensor). The key takeaway: The drive believes the motor

If the coupling between motor and load is loose, or there is excessive gear backlash, the drive’s feedback device (mounted on the motor) will show perfect position, but the actual load position lags. When the load suddenly catches up, the drive perceives it as a latch error.