What causes fault code AB-F005 (PowerFlex Fault Code F2 - Auxiliary Input)?

E-stop circuit open — button pressed or wiring fault. External overload relay tripped (if wired to auxiliary input). Safety relay output contact open. Door interlock switch open on drive enclosure. Wiring error — aux input not jumpered when not used

How do I fix fault code AB-F005?

Check what is wired to the auxiliary fault input terminal on the PowerFlex. If E-stop, verify all E-stop buttons are released and circuit is complete. If external overload, investigate motor overload condition and reset. Verify safety relay output is closed. If aux input is not used, jumper it per PowerFlex installation manual. Reset fault via keypad or digital input after clearing cause

PowerFlex Fault Code F2 - Auxiliary Input

AB-F005

PowerFlex drive Fault 2: External fault input is active. An auxiliary contact or safety device is signaling a fault condition.

medium allen-bradley vfd

allen-bradley powerflex auxiliary e-stop safety

Probable Causes (ranked)

E-stop circuit open — button pressed or wiring fault
External overload relay tripped (if wired to auxiliary input)
Safety relay output contact open
Door interlock switch open on drive enclosure
Wiring error — aux input not jumpered when not used

Fix Steps

1 Check what is wired to the auxiliary fault input terminal on the PowerFlex
2 If E-stop, verify all E-stop buttons are released and circuit is complete
3 If external overload, investigate motor overload condition and reset
4 Verify safety relay output is closed
5 If aux input is not used, jumper it per PowerFlex installation manual
6 Reset fault via keypad or digital input after clearing cause

Field Trick

Look at terminal 27 (or check the drive manual for your model). Whatever's wired there is what's faulting. If nothing is wired, it needs a jumper.

Suggested Replacement Parts

Parts matched to fault category: Safety Relay

Allen-Bradley Guardmaster 440R-N23126 P/N: 440R-N23126 Dual-channel safety relay, 24VDC, 3 N.O. + 1 N.C., Cat 4 / PLe

AutomationDirect $125.00 Amazon $95.00 Grainger $155.00

Pilz PNOZ X3 Safety Relay P/N: 774310 24VDC/AC, 3 N.O. + 1 N.C., E-stop and safety gate monitoring

AutomationDirect $145.00 Amazon $135.00 McMaster-Carr $165.00

Prices are estimates. Verify part numbers match your equipment before ordering.

Need a deeper diagnosis with photo analysis and AI-powered troubleshooting?

Run Full Diagnosis