Recommended logs and evidence to collect for vendor support
Summary
: Verify that the safety circuit (E-stop, light curtains, etc.) is not actively engaged. Reset any physical emergency stop buttons. Inspect Wiring : Check the wiring at the drive's safety terminals ( ). Look for loose screws or damaged insulation. Measure Voltage
The communication option card may have vibrated loose from its slot on the drive's main control board, or the pins are bent.
H66 often appears when the feedback signal (encoder, resolver, or other position sensor) is corrupted by electrical noise. A noisy quadrature encoder signal can momentarily show the motor overshooting its position, triggering the fault.
Perform a "Clean All" or recompile within the DriveWorksEZ software utility. Download the freshly compiled program back to the VFD. Re-enable DriveWorksEZ by setting parameter . Test the system under controlled, low-load conditions. Advanced Prevention Strategies
The Yaskawa error code H66 can be a challenging issue to resolve, but with a thorough understanding of its causes, symptoms, and troubleshooting steps, users can minimize downtime and optimize their servo drive and motor performance. By following the guidelines outlined in this article, users can effectively diagnose and resolve H66 errors, ensuring reliable and efficient operation of their Yaskawa products. If you are experiencing issues with your Yaskawa product or require further assistance, contact Yaskawa support or consult the product user manual for guidance.
Yaskawa error code indicates a Safety Input Discrepancy . This error occurs when the dual-channel safety inputs (H1 and H2) do not match each other's state within a specific, predetermined timeframe.
Possible causes (ranked)
Recommended logs and evidence to collect for vendor support
Summary
: Verify that the safety circuit (E-stop, light curtains, etc.) is not actively engaged. Reset any physical emergency stop buttons. Inspect Wiring : Check the wiring at the drive's safety terminals ( ). Look for loose screws or damaged insulation. Measure Voltage yaskawa error code h66
The communication option card may have vibrated loose from its slot on the drive's main control board, or the pins are bent.
H66 often appears when the feedback signal (encoder, resolver, or other position sensor) is corrupted by electrical noise. A noisy quadrature encoder signal can momentarily show the motor overshooting its position, triggering the fault. Recommended logs and evidence to collect for vendor
Perform a "Clean All" or recompile within the DriveWorksEZ software utility. Download the freshly compiled program back to the VFD. Re-enable DriveWorksEZ by setting parameter . Test the system under controlled, low-load conditions. Advanced Prevention Strategies
The Yaskawa error code H66 can be a challenging issue to resolve, but with a thorough understanding of its causes, symptoms, and troubleshooting steps, users can minimize downtime and optimize their servo drive and motor performance. By following the guidelines outlined in this article, users can effectively diagnose and resolve H66 errors, ensuring reliable and efficient operation of their Yaskawa products. If you are experiencing issues with your Yaskawa product or require further assistance, contact Yaskawa support or consult the product user manual for guidance. Look for loose screws or damaged insulation
Yaskawa error code indicates a Safety Input Discrepancy . This error occurs when the dual-channel safety inputs (H1 and H2) do not match each other's state within a specific, predetermined timeframe.
Possible causes (ranked)
