Allen-Bradley PowerFlex 525 F107 — What It Means
F107 displays as “Replaced C-P” on the Allen-Bradley PowerFlex 525. It means the drive’s control module cannot recognize the power module it is attached to. Rockwell Automation classifies this as a hardware fault, not a wiring or motor issue.
The fault typically appears after a repair or module swap, especially when someone mounts a control module to a power module with a different power rating or from a different drive family. The drive will not run until the modules are correctly matched and the fault clears.
Before You Replace Anything
Technicians sometimes replace the control module first. Always verify module compatibility and try a known-good power module before ordering a new control module, because the power module is the first replacement step in Rockwell’s published procedure.
Common Causes
- Mismatched module pairing (~50%) A control module installed on a power module with a different rating or from a different drive family will trigger F107 because the control module cannot identify the power section.
- Failed power module (~30%) Hardware failure inside the power module prevents the control module from reading its identity and causes the recognition fault.
- Failed control module (~15%) A defective control module may lose the ability to recognize even a correctly paired power module.
- Poor seating or damaged connectors (~5%) If the control module is not fully seated or the connector pins are bent or corroded, the module identity signal will not pass and F107 appears.
Quick Diagnosis
Answer these to narrow it down fast.
Did the fault appear immediately after replacing or swapping a module?
No: A hardware failure in the power module or control module has developed. Proceed with the swap-test procedure below.
Is the control module catalog number listed as compatible with the power module rating on your drive?
No: You have a mismatch. Install the correct power module or control module for your drive rating.
Does reseating the control module clear the fault?
No: Hardware failure is confirmed. Follow the module-swap procedure to identify whether the power module or control module has failed.
Step-by-Step Fix
- Disconnect all power to the drive and verify with a meter that DC bus voltage has decayed to zero before touching any modules.
- Record the catalog numbers from both the control module and the power module nameplates and confirm they are a valid match for your drive frame and rating.
- Remove the control module by releasing the mounting screws or clips (consult your installation manual for the exact method) and inspect the connector pins for bent or corroded contacts.
- Reseat the control module firmly and restore power to see if the fault clears. If it does, monitor the drive for a recurrence.
- Swap in a known-good compatible power module if the fault persists. If F107 clears, the original power module is defective and should be replaced.
- Replace the control module if the fault remains after confirming the power module is correct and known-good, because Rockwell’s procedure lists the control module as the next replacement when changing the power module does not resolve the fault.
- Perform a factory reset via parameter P053 (Reset To Defaults = 2) if required by your service procedure, then return the drive to service and verify normal operation under load.
Parts Often Needed
| Part | Notes |
|---|---|
| PowerFlex 525 power module | Amazon | Match the catalog number and kW/HP rating exactly to your drive frame. |
| PowerFlex 525 control module | Amazon | Order the correct module for your power rating if swapping the power module does not clear the fault. |
When to Call a Pro
Call a qualified electrician or automation technician for F107. The repair requires safe lockout of line voltage, correct identification of module catalog numbers, and replacement of drive hardware. Mismatched modules can damage the drive or create unsafe operating conditions. A technician will have access to known-good spare modules for swap testing and the tools to verify proper DC bus discharge before working inside the enclosure. If your facility does not stock spare PowerFlex modules, a service provider can source and install the correct matched pair and verify drive operation under load.
Rough cost: A pro service call runs about $200-600 for module replacement and labor.