When an Allen-Bradley PowerFlex 525 trips, it shows an F followed by a number and the driven machine stops. This guide covers the PowerFlex 525 fault codes a maintenance team meets most often, what each one means, the usual cause, and how to clear it, so you can get from a stopped line to a root cause in minutes.
Key takeaways
The PowerFlex 525 protects itself and the motor by tripping the moment a measured value leaves its safe window: DC bus voltage, output current, heatsink temperature, or a lost signal. The display shows the fault code, for example F005, and the drive coasts to a stop. Read the code as a pointer, not a verdict. F005 Overvoltage does not mean the drive is broken. It means the DC bus climbed too high, usually because a high-inertia load decelerated faster than the drive could absorb the energy the motor pushed back.
The faults most common on the shop floor, with the code as it appears on the display, the fault name, and the usual cause. The complete list lives in Rockwell publication 520-UM001; this is the working subset.
| Code | Fault | Usual cause |
|---|---|---|
| F002 | Auxiliary Input | A wired external trip or interlock opened |
| F003 | Power Loss | Incoming AC line lost or running on a single phase |
| F004 | Undervoltage | DC bus fell below minimum (supply dip or interruption) |
| F005 | Overvoltage | DC bus rose above maximum (fast decel of a high-inertia load, or a line surge) |
| F006 | Motor Stalled | The drive could not accelerate or decelerate the motor |
| F007 | Motor Overload | The motor drew more current than its overload setting allows |
| F008 | Heatsink Overtemp | The power module ran too hot |
| F009 | Control Module Overtemp | The control electronics ran too hot |
| F012 | HW Overcurrent | Output current exceeded the hardware limit |
| F013 | Ground Fault | A current path to earth at the drive output |
| F015 | Load Loss | Output torque current dropped below the set threshold (broken coupling or lost load) |
| F021 | Output Phase Loss | One output phase to the motor is missing |
| F029 | Analog Input Loss | A configured analog signal was lost |
| F033 | Auto Restart Tries | The drive used up its programmed automatic restart attempts |
| F038 | Phase to Ground | A motor phase is shorted to ground |
| F048 | Params Defaulted | Parameters were reset to factory defaults |
| F059 | Safety Open | The Safe Torque Off inputs are not enabled |
| F064 | Drive Overload | The drive rating was exceeded |
| F070 | Power Unit | A failure in the drive power section |
| F071 | DSI Net Loss | Modbus or DSI communication was interrupted |
| F073 | EtherNet/IP Loss | The embedded network adapter lost its connection |
F005 Overvoltage. The DC bus went over its limit. On a real line this is almost always a deceleration problem: a loaded conveyor or a high-inertia fan is being told to stop faster than the drive can bleed off the returned energy. Extend the decel time, or fit a dynamic braking resistor sized for the load. Rule out AC line surges and a high or floating supply voltage before you suspect the drive.
F004 Undervoltage. The bus dropped too low. Look upstream, not at the drive: a sagging supply, a loose incoming terminal, or a shared feed with a large motor or welder that pulls the line down on start. Confirm the input voltage under load.
F007 Motor Overload. The motor pulled more current than its overload allows, for too long. Check the mechanical load first (a jam, a seized bearing, a load that grew), then confirm the motor overload current parameter P033 matches the motor nameplate and that the boost is not set too high.
F008 Heatsink Overtemp. The power module overheated. Clean the heatsink and check the cooling fan, the enclosure ventilation, and the ambient temperature. A drive in a sealed panel next to a heat source will trip on a hot afternoon even when nothing electrical is wrong.
F013 Ground Fault. The drive found current leaking to earth at its output. This is a wiring and insulation fault, and it is a safety issue. Megger the motor and the motor cable, inspect the gland and terminations for damage or moisture, and repair the grounded conductor before you run again. A ground fault that keeps returning on the same motor points to failing winding insulation, which is a job for planned replacement, not repeated resets.
F029 Analog Input Loss and F033 Auto Restart Tries. F029 means a speed or setpoint signal the drive was told to watch has disappeared: check the analog wiring and the loss-of-signal parameter. F033 means the drive already tried to restart itself the set number of times and gave up, so the real fault (often F004 or F005) is still present. Fix the first fault, and F033 stops.
F059 Safety Open and F071 or F073 network loss. F059 means the Safe Torque Off inputs are not made: check the safety circuit and the wired safety device or jumpers. F071 and F073 are communication drops on Modbus or DSI and on EtherNet/IP: check the cable, the connector, the node address, and the controller that talks to the drive.
Do not clear a fault until you know why it tripped. Once you have the cause, reset the drive by pressing Stop and Reset on the keypad, by cycling input power, or over the network with a fault-clear command. If the fault returns the instant you run, the condition is still there. Repeatedly clearing a ground fault or an overcurrent just to keep production moving is how a small problem becomes a burned motor or a damaged drive.
One overvoltage trip is an event. The same drive tripping on F005 every Monday, or on F013 twice a month, is a pattern that predicts a failure. Teams that stay ahead of drive faults do not just clear them, they log them: which code, which asset, which shift, how often. That record is where a stopped machine becomes a scheduled fix instead of a surprise.
This is what a CMMS and predictive maintenance software are for: capturing every trip against the asset, surfacing the drives that fault most, and raising a work order before the next one stops the line. If VFD faults are turning into unplanned downtime, book a demo and we will show you how the recurring ones get caught early.
Related reading: Yaskawa VFD fault codes and motor insulation classes, where the F013 ground-fault story usually ends.
What is the most common PowerFlex 525 fault? On most lines it is F005 Overvoltage or F004 Undervoltage, both supply and deceleration issues, followed by F007 Motor Overload. F008 Heatsink Overtemp climbs in summer.
How do I reset a PowerFlex 525 fault? Press Stop and Reset on the keypad, cycle input power, or send a fault-clear over the network. Find and fix the cause first, or it trips again.
Does a fault code mean the drive is broken? Usually not. Most PowerFlex 525 faults point to the supply, the load, the wiring, or the cooling. A true drive-hardware fault such as F070 Power Unit is the exception, not the rule.
Where is the full fault list? Rockwell publication 520-UM001, the PowerFlex 525 user manual, lists every code and the detailed condition behind it.
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