Code Uv3: Undervoltage 3 (Inrush Prevention Circuit Fault)
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical Undervoltage 3 (Inrush Prevention Circuit 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 V1000 Troubleshooting The contactor on the inrush prevention circuit is damaged. - Cycle power to the drive. Check if the fault reoccurs. - Replace the drive if the fault continues to occur. - Check monitor U4-06 for the performance life of the inrush prevention circuit. - Replace the drive if U4-06 exceeds 90%.
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 Uv3 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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