What causes fault code AB-F008 (PowerFlex 525 F7 - Motor Overtemp)?

Motor running above rated current for extended period. Ambient temperature too high for motor service factor. Motor cooling fan blocked or failed (TEFC motor). Thermistor parameter enabled but thermistor not connected. Motor thermal model parameters don't match actual motor

How do I fix fault code AB-F008?

Check actual motor temperature with IR thermometer. Verify motor current on drive display vs nameplate FLA. Clean motor cooling fins and verify fan rotation (TEFC motors). If using thermistor, verify wiring to drive analog input. If not using thermistor, disable thermistor fault parameter. Check motor thermal model settings match motor nameplate data

PowerFlex 525 F7 - Motor Overtemp

AB-F008

PowerFlex 525 detected motor over-temperature via thermal model or thermistor input.

medium allen-bradley vfd

allen-bradley powerflex motor overtemperature thermal

Probable Causes (ranked)

Motor running above rated current for extended period
Ambient temperature too high for motor service factor
Motor cooling fan blocked or failed (TEFC motor)
Thermistor parameter enabled but thermistor not connected
Motor thermal model parameters don't match actual motor

Fix Steps

1 Check actual motor temperature with IR thermometer
2 Verify motor current on drive display vs nameplate FLA
3 Clean motor cooling fins and verify fan rotation (TEFC motors)
4 If using thermistor, verify wiring to drive analog input
5 If not using thermistor, disable thermistor fault parameter
6 Check motor thermal model settings match motor nameplate data

Field Trick

Hit the motor with an IR temp gun. If it's actually cool, the thermal model parameters are wrong — not a real overtemp.

Suggested Replacement Parts

Parts matched to fault category: Motor

Baldor/ABB 1HP TEFC Motor P/N: EM3554T 1HP, 1765RPM, 143TC frame, 230/460V, TEFC, premium efficiency

AutomationDirect $285.00 Amazon $310.00 Grainger $345.00

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

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