Allen-Bradley 20G1ABD485AN0NNNNN

Common Fault Codes

Fault 12

HW OverCurrent – Hardware overcurrent detection has been triggered, indicating the output current has exceeded the drive's hardware current limit.
Check motor and output wiring for short circuits or ground faults. Verify motor load is within drive rating. Inspect output transistors for damage.

Fault 13

Ground Fault – A ground fault has been detected on the output of the drive, indicating current leakage to earth.
Disconnect motor and test insulation resistance of motor windings and output cables. Replace damaged cables or motor if insulation has failed.

Fault 3

Power Loss – DC bus voltage has dropped below the minimum threshold, indicating an input power loss or severe voltage sag.
Check input supply voltage and connections. Verify upstream fuses and contactors. Inspect input rectifier and DC bus capacitors.

Fault 4

UnderVoltage – DC bus voltage is below the minimum operating level during run condition.
Verify input line voltage is within specification. Check for loose input connections or failing input components. Inspect precharge circuit.

Fault 5

OverVoltage – DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from the motor.
Check deceleration ramp time and increase if necessary. Verify braking resistor or regenerative unit is connected and functional. Check input voltage for overvoltage conditions.

Fault 7

Motor Overload – The drive's electronic thermal overload protection has tripped, indicating the motor has been operating above its rated current for an extended period.
Check motor load for mechanical binding or overloading. Verify motor nameplate data is correctly programmed in the drive. Allow motor to cool before restarting.

Fault 29

Analog Input Loss – An analog input signal configured as a speed or process reference has fallen below the minimum threshold, indicating a broken wire or signal loss.
Check analog input wiring and signal source. Verify signal levels at the drive terminals. Configure the analog input loss action parameter as appropriate for the application.

Fault 71

Adapter Communication Loss – Communication between the drive and an installed option card or network adapter has been lost.
Check option card seating in the drive slot. Inspect network cabling and connections. Verify network scanner or controller is active and configured correctly.