Once the root cause (conflicting signals) is removed, you can clear the error by pressing on the keypad or by cycling the power.
Check the PLC program to ensure that the Forward and Reverse outputs are properly interlocked.
: The host PLC or controller might have a programming error that activates both direction bits simultaneously during a cycle. 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
: Electromagnetic interference (EMI) can sometimes cause "ghost" signals on the control circuit, tricking the drive into seeing a second command. Troubleshooting and Solutions To resolve the H66 error, follow these structured steps: Check Input Status : Once the root cause (conflicting signals) is removed,
: The most frequent cause is the drive detecting a high signal on both the Forward and Reverse input terminals (e.g., S1 and S2) at once.
Verify if both Forward and Reverse commands are lit up at the same time. : For more detailed technical data or model-specific wiring
Ensure that you are using Yaskawa-recommended shielded cables for control signals to prevent noise. :
Add a small "dwell" time or interlock delay when switching directions to ensure one command is completely OFF before the other turns ON. :