What causes fault code AB-PF-F002 (PowerFlex VFD Fault F002 â€” Auxiliary Input)?

External safety relay or contactor aux contact opened â€” upstream protective device tripped. Motor thermistor/PTC wired to aux input has gone high-resistance â€” motor overheating. Door interlock switch wired to aux input opened â€” enclosure door was opened. External pressure or level switch wired to aux input tripped. Wiring to aux input broken or terminal loose â€” open circuit reads as fault

How do I fix fault code AB-PF-F002?

Identify what device is wired to the drive's digital input configured as Aux Fault â€” check panel drawings. Check the external device status â€” reset if tripped, verify normal condition. If motor thermistor, check motor temperature â€” let cool before resetting drive. Verify wiring from external device to drive terminal â€” check for broken wire or loose terminal. Reset drive fault from keypad, digital input, or via network command. In drive parameters, check which digital input is configured for 'Auxiliary Fault' (Parameter group A06x)

PowerFlex VFD Fault F002 â€” Auxiliary Input

AB-PF-F002

PowerFlex 525/527 drive faulted on auxiliary input (digital input configured as fault input). External device signaled a fault condition to the drive.

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allen-bradley powerflex vfd drive F002 auxiliary input 525 527

Probable Causes (ranked)

External safety relay or contactor aux contact opened â€” upstream protective device tripped
Motor thermistor/PTC wired to aux input has gone high-resistance â€” motor overheating
Door interlock switch wired to aux input opened â€” enclosure door was opened
External pressure or level switch wired to aux input tripped
Wiring to aux input broken or terminal loose â€” open circuit reads as fault

Fix Steps

1 Identify what device is wired to the drive's digital input configured as Aux Fault â€” check panel drawings
2 Check the external device status â€” reset if tripped, verify normal condition
3 If motor thermistor, check motor temperature â€” let cool before resetting drive
4 Verify wiring from external device to drive terminal â€” check for broken wire or loose terminal
5 Reset drive fault from keypad, digital input, or via network command
6 In drive parameters, check which digital input is configured for 'Auxiliary Fault' (Parameter group A06x)

Field Trick

Parameter A06x in the PowerFlex 525 shows which digital input is configured as the fault input and whether it is normally open or normally closed. Check this first â€” the aux input might be inverted from what you expect.

Suggested Replacement Parts

Parts matched to fault category: Vfd Drive

Allen-Bradley PowerFlex 525 AC Drive 1HP P/N: 25B-D2P3N114 1HP, 480V, 3-phase, built-in EtherNet/IP, EMC filter

AutomationDirect $395.00 Amazon $450.00 Grainger $520.00

ABB ACS580 General Purpose Drive 2HP P/N: ACS580-01-05A7-4 2HP, 480V, built-in safe torque off, adaptive programming

AutomationDirect $425.00 Amazon $480.00 Grainger $550.00

GS20 AC Drive 1HP (Budget Option) P/N: GS20-20P5 1HP, 230V, sensorless vector, compact size — good replacement for testing

AutomationDirect $149.00 Amazon $175.00

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

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