Code UFB-416: EncOut Cflct
Issue Description & Safety Warning
The Allen-Bradley PowerFlex 750 Drive has triggered a critical EncOut Cflct 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 Either P9 [FB0 Loss Cfg] or P39 [FB1 Loss Cfg] Indicates that there is one of the following problems with the Encoder Output: • The selection in the P80 [Enc Out Sel] is not possible since the required pins on the terminal blocks are already used for Feedback 0 or 1 according to P6 [FB0 Device Sel] and P36 [FB1 Device Sel]. • P80 [Enc Out Sel] is set to 2 “Sine Cosine” and there is no signal connected to the pins 1…4 of TB 1. • P80 [Enc Out Sel] is set to 2 “Sine Cosine,” the value of P15/45 [FBX IncAndSC PPR] is not a power of two, and P84 [EncOut Z PPR] is not set to 0 “1 ZPulse.” The value of P15/45 [FBX IncAndSC PPR] must be a power of two. • P80 [Enc Out Sel] is set to 3 “Channel X” or 4 “Channel Y” and there is no encoder connected to that channel. • P80 [Enc Out Sel] is set to 3 “Channel X” or 4 “Channel Y” and there is a linear encoder connected to this channel. Reset Description
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 UFB-416 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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