Observed symptoms
Rapid drops or surges in the DC bus voltage (due to undersized power supply or bad capacitor banks) can cause the drive’s position/speed estimator miscalculations, leading to H66. yaskawa error code h66
Turn the power supply OFF and ON. If the alarm persists, it indicates a hard fault rather than a transient noise issue. Observed symptoms Rapid drops or surges in the
Observed symptoms
Rapid drops or surges in the DC bus voltage (due to undersized power supply or bad capacitor banks) can cause the drive’s position/speed estimator miscalculations, leading to H66.
Turn the power supply OFF and ON. If the alarm persists, it indicates a hard fault rather than a transient noise issue.
