Code GF: Ground Fault
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Ground Fault alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Code type: Fault Manual section: Yaskawa A1000 Troubleshooting Motor insulation is damaged. - Check the insulation resistance of the motor. - Replace the motor. A damaged motor cable is creating a short circuit. - Check the motor cable. - Remove the short circuit and turn the power back on. - Check the resistance between the cable and the ground terminal. - Replace the cable. The leakage current at the drive output is too high. - Reduce the carrier frequency. - Reduce the amount of stray capacitance. The drive performed a current offset adjustment while the motor was rotating. - The value set exceeds the allowable setting range while the drive automatically adjusts the current offset (this generally only happens when attempting to restart a PM motor that is coasting to stop). - Enable Speed Search at start (b3-01 = 1). - Perform Speed Search 1 or 2 (H1-□□ = 61 or 62) via one of the external terminals. Note: Speed Search 1 and 2 are the same when using PM OLV. Hardware problem. Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest sales representative.
Source: Yaskawa AC Drive A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 21H)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa A1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code GF on the A1000 AC Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Yaskawa's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 280 Yaskawa A1000 AC Drive codes.
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