Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
The drive reports a fatal hardware fault. The power stage is immediately disabled. The motor coasts to a stop. The HMI displays F8000 and no reset is possible.
Possible Causes
- Power module IGBT failure
- Control board fatal hardware defect
- Internal power supply failure
- Severe overcurrent event damaged internal components
Troubleshooting Steps
- Step 1: Disconnect all power and wait 5 minutes for DC bus discharge
Verify DC bus voltage is below 36V before any inspection - Step 2: Inspect the power module for visible damage, burn marks, or bulging capacitors
Any physical damage confirms hardware failure requiring module replacement - Step 3: Check motor and cable insulation with a megohmmeter
Motor winding insulation > 1MOhm; cable insulation intact - Step 4: Replace the drive unit or the identified defective module
New unit initializes without F8000 after parameter reload
How to Reset
1) Disconnect all power. 2) Wait for DC bus discharge (5 min minimum). 3) Verify safe voltage level. 4) Inspect for physical damage. 5) Test motor and cable insulation. 6) Replace defective module. 7) Reload parameters. Caution: F8000 indicates potentially dangerous internal damage. Do not attempt to power on again without repair.
Common Replacement Parts
- R911319000: IndraDrive power module (verify exact model) (Full drive replacement may be required depending on model)
Frequently Asked Questions
- Q: What is the difference between F8000 and F9004?
F8000 is a fatal hardware fault specifically in the power stage or internal power supply. F9004 is a broader hardware fault that may be in the control board.
- Q: Is it safe to reset F8000?
No. F8000 indicates fatal hardware damage. Repeated power-on attempts risk further damage. The unit must be repaired or replaced.
Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD