Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
The drive reports an internal RTOS (Real-Time Operating System) function fault. The power stage is disabled. The HMI shows F9002 with no sub-code.
Possible Causes
- RTOS scheduling failure or stack overflow
- Firmware version incompatibility
- Control board hardware degradation
- Memory allocation failure during runtime
Troubleshooting Steps
- Step 1: Power-cycle the drive control power (24V DC)
If F9002 clears, monitor for recurrence; if it returns, the control board needs replacement - Step 2: Check for recent firmware updates that may have introduced incompatibility
Roll back to previous firmware version if possible - Step 3: Verify available memory on the control module
No memory-related warnings in IndraWorks AS - Step 4: Replace control module if the fault is persistent
New module boots without RTOS errors
How to Reset
1) Remove 24V DC control power for 30 seconds. 2) Reapply and observe. 3) If F9002 returns, connect IndraWorks AS and check for firmware version compatibility. 4) Roll back firmware if a recent update was applied. 5) Replace control module if fault persists.
Frequently Asked Questions
- Q: Is F9002 a hardware or software fault?
It is primarily a firmware/RTOS fault. However, if it recurs after firmware re-flash, it indicates control board hardware degradation.
- Q: Can I continue running with F9002?
No. The power stage is disabled and the motor cannot operate until the fault is resolved.
Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD