Code End1: Excessive V/f Setting (detected only during Rotational Auto-Tuning and displayed after Auto-Tuning is complete)
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Excessive V/f Setting (detected only during Rotational Auto-Tuning and displayed after Auto-Tuning is complete) 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: Auto-tuning fault/alarm Manual section: Yaskawa A1000 Troubleshooting The torque reference exceeded 20% during Auto-Tuning. - Before Auto-Tuning the drive, verify the information written on the motor nameplate and enter that data to T1-03 through T1-05. - Enter proper information to parameters T1-03 to T1-05 and repeat Auto-Tuning. - If possible, disconnect the motor from the load and perform Auto-Tuning. If the load cannot be uncoupled, simply use the Auto-Tuning results as they are. The results from Auto-Tuning the no-load current exceeded 80%.
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 End1 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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