Yaskawa Error Code H66 ❲Simple • SERIES❳
H66
The error on Yaskawa drives typically indicates a Digital Operator Communication Error , which occurs when the drive does not receive any data from the digital operator (keypad) for a specific duration. 1. Common Causes
- Limit motion and torque until fault resolved.
- Avoid power cycling repeatedly (may mask intermittent faults).
- Implement softer acceleration profiles to reduce stress on feedback system during diagnostics.
0– Fault on operator removal (default – trips with H66)1– No fault (continues running without operator)
- Motor phase loss: A motor phase loss occurs when one or more phases of the motor windings are lost, causing an imbalance in the motor's electrical circuit.
- Output phase loss: An output phase loss happens when one or more phases of the drive's output are lost, preventing the motor from operating correctly.
- Loose or faulty motor connections: Verify that all motor connections are secure and not damaged.
- Drive output transistor fault: A faulty output transistor can cause the H66 error code.
- Incorrect motor configuration: Ensure that the motor configuration matches the drive's settings.
Appendix — quick checklist (for technicians) yaskawa error code h66
: Loss of synchronization between the main control board and an option module or an internal high-speed processor. Secondary Cause H66 The error on Yaskawa drives typically indicates