Code Er-09: Acceleration Error
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Acceleration Error 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 motor did not accelerate for the specified acceleration time. - Increase the acceleration time (C1-01). - Check if it is possible to disconnect the machine from the motor. Torque limit when motoring is too low (L7-01 and L7-02). - Check the settings of parameters L7-01 and L7-02. - Increase the setting. The load during Rotational Auto-Tuning was too high. - Disconnect the motor from machine and restart Auto-Tuning. If motor and load cannot be uncoupled make sure the load is lower than 30%. - If a mechanical brake is installed, make sure it is fully lifted during tuning.
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 Er-09 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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