Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
The drive reports an internal function fault. The power stage is disabled and the motor stops. The fault cannot be reset without addressing the internal error.
Possible Causes
- Internal firmware function returned an unexpected result
- Parameter set corruption after firmware update
- Control board memory fault
- Incompatible firmware version with hardware revision
Troubleshooting Steps
- Step 1: Check the fault history in IndraWorks AS for detailed sub-code information
Identify which internal function triggered the fault - Step 2: Reload the last known-good parameter set from backup
Drive accepts parameters without error after reload - Step 3: If the fault persists, re-flash the firmware with the correct version for the hardware
Firmware update completes and drive re-initializes - Step 4: Replace the control module if re-flashing does not resolve
New control module starts without F9001
How to Reset
1) Connect via IndraWorks AS. 2) Read the detailed fault description from the diagnostic buffer. 3) Reload parameter backup. 4) If unresolved, re-flash firmware. 5) Power-cycle after firmware update. Caution: Use only the firmware version approved for your specific hardware revision.
Common Replacement Parts
- R911319000: IndraDrive control module (Verify hardware compatibility before replacement)
Frequently Asked Questions
- Q: What is F9001 on Rexroth drive?
An internal function fault indicating the firmware detected an unexpected internal state. This is not a field-wiring issue but an internal control board problem.
- Q: Will reloading parameters fix F9001?
It may help if the fault was caused by parameter corruption. If the firmware itself is corrupted, a re-flash or control module replacement is needed.
Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD