Code P11-CONV-11302: C3 Phase Loss L1
Issue Description & Safety Warning
The Allen-Bradley PowerFlex 750 Drive has triggered a critical C3 Phase Loss L1 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
Type: Alarm 1 The AC line-to-line voltages are imbalanced, indicating an open AC input phase. • Check for an upstream AC line loss. • Verify that the AC input line wiring is properly connected. • Check the wiring harness to the converter gate firing board for loose connections and/or damage. If necessary, replace the converter gate-firing board wiring harness.
Source: Allen-Bradley PowerFlex 750-Series AC Drives Programming Manual (750-PM001)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Allen-Bradley PowerFlex 750 Drive Alarms
Allen-Bradley controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code P11-CONV-11302 on the PowerFlex 750 Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Allen-Bradley's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 663 Allen-Bradley PowerFlex 750 Drive codes.
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