Yaskawa Error — Code H66 ((install))

Inspect the control terminal block for loose wires or stray strands that might be touching adjacent terminals.

: A short circuit in the control wiring can bridge two input terminals, causing a phantom second run command.

Ensure that you are using Yaskawa-recommended shielded cables for control signals to prevent noise. : yaskawa error code h66

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. Inspect the control terminal block for loose wires

Verify if both Forward and Reverse commands are lit up at the same time. :

: The host PLC or controller might have a programming error that activates both direction bits simultaneously during a cycle. : Once the root cause (conflicting signals) is

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