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 to F040 | Phase U, V or W to Gnd | A phase to ground fault between the drive and the motor on that phase |
| 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.
Before you touch the drive output or the motor leads: remove power and lock out the drive, wait three minutes, then measure across the DC+ and DC- terminals until the bus reads zero volts. Rockwell also says to verify that the line terminals are dead and to keep the meter on the terminals until the voltage has discharged to zero.
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. With the drive locked out and the bus at zero volts, disconnect the motor leads from T1, T2 and T3 and megger the motor and the motor cable from there, never through the drive, then 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 Esc to acknowledge the fault and then Stop (this clears it when P045 [Stop Mode] is set between 0 and 3), by setting A551 [Fault Clear] to 1, by a digital input programmed to 13 Clear Fault, 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 planning a follow-up task 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.
If your drive is a PowerFlex 4, its manual lists this fault as F5 OverVoltage, and it means exactly the same thing: the DC bus voltage exceeded its maximum value. The PowerFlex 523 and 525 share one manual, 520-UM001, where it appears as F005. A few codes in that manual do not apply to the 523, including F015 Load Loss, F059 Safety Open and F073 EN Net Loss.
The parameter numbers differ between the two families:
Press Esc to acknowledge the fault. On a PowerFlex 4 the latest fault is in d007 [Fault 1 Code]. Fix the cause, then clear the fault with Stop (if the stop mode parameter is set between 0 and 3), with the fault clear parameter, with a digital input set to Clear Fault, or by cycling power.
For unattended sites, auto restart can clear a Type 1 fault and restart the drive: set A541 [Auto Rstrt Tries] and A542 [Auto Rstrt Delay] on a 525, or A092 and A093 on a PowerFlex 4. With the delay set to 0, the drive clears an overvoltage, undervoltage or heatsink overtemperature fault without restarting. Rockwell warns to use caution, because the drive then issues its own start command. When the tries run out, the drive trips F033 Auto Restart Tries, which tells you the original fault is still there.
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 Esc, then Stop (with P045 [Stop Mode] set between 0 and 3), set A551 [Fault Clear] to 1, 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.
Fabrico is a manufacturing operations platform combining OEE monitoring with computer vision, a full CMMS, MES capabilities and PLC connectivity in one data model.
Stop chasing this fault by hand. Fabrico logs each stop against the machine's history, so a repeating fault shows up before it becomes a hard line stop, and the team can open a prioritized work order with the stop itself captured on video wherever a camera covers the line.
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