Allen-Bradley 25B-CTMFC1

Common Fault Codes

Fault Code F005

OverVoltage fault. DC bus voltage has exceeded the overvoltage trip threshold during deceleration or regenerative operation.
Increase deceleration time, add a dynamic braking resistor, or check incoming supply voltage for transients. Verify bus voltage with a meter.

Fault Code F006

UnderVoltage fault. DC bus voltage has dropped below the minimum operating threshold, typically caused by a low or interrupted input supply.
Check input line voltage at all three phases. Verify supply voltage is within drive nameplate rating. Inspect fuses and contactors in the input circuit.

Fault Code F012

HW OverCurrent fault. Output current has exceeded the hardware overcurrent trip level, indicating a short circuit or severe overload condition.
Check motor wiring for short circuits or ground faults. Verify motor insulation resistance. Inspect output terminals and cable routing.

Fault Code F013

Ground Fault detected. Excessive current is flowing to ground on the output side of the drive.
Disconnect motor and test insulation resistance with a megohmmeter. Inspect motor cable for damaged insulation. Replace motor or cable if insulation is compromised.

Fault Code F033

Auto Restart attempts exceeded. The drive has attempted to automatically restart after a fault the maximum number of times without successfully running.
Identify and resolve the underlying fault that triggered repeated restarts. Review fault queue history. Adjust auto-restart parameters if appropriate for the application.

Fault Code F038

Phase Loss fault. One or more input phases are missing or have significantly unbalanced voltage.
Check all three input line connections and tighten any loose terminals. Measure phase-to-phase voltages at the drive input. Inspect upstream fuses and contactors.

Fault Code F081

Communication Loss fault. The drive has lost communication with the controlling network device (e.g., EtherNet/IP scanner or PLC) within the configured timeout period.
Check Ethernet cable connections and network switch status. Verify PLC or controller is running and actively scanning the drive. Review communication timeout parameter settings in the drive.

Fault Code F122

Option Module fault. A problem has been detected with an installed option module, which may include the communications/I/O module such as the 25B-CTMFC1.
Power down the drive and reseat the option module firmly in its slot. Inspect the module connector for bent pins or contamination. Replace the module if the fault persists after reseating.