Code Er-04: Line-to-Line Resistance Error
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical Line-to-Line Resistance 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 V1000 Troubleshooting Motor data entered during Auto-Tuning was incorrect. - Enter the correct data. - Restart Auto-Tuning and enter the correct information. Auto-Tuning did not complete within designated time frame. - Check and correct faulty motor wiring. - Disconnect the motor from machine and perform Rotational Auto-Tuning. Drive-calculated values outside parameter setting range.
Source: Yaskawa AC Drive V1000 Compact Vector Control Drive Technical Manual (SIEP C710606 19D)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa V1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code Er-04 on the V1000 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: 153 Yaskawa V1000 AC Drive codes.
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