Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Safe negative position limit exceeded. The motor position has exceeded the safety-configured negative end-of-travel limit.
Possible Causes
- Motor traveled beyond the negative safe position limit
- Position feedback error causing false position indication
- Safe negative limit parameter set incorrectly
- Mechanical end-stop failure allowing overtravel in negative direction
Troubleshooting Steps
- Step 1: Check the safe negative position limit parameter
Parameter value matches the machine safety assessment - Step 2: Verify position feedback accuracy
Position reading matches actual mechanical position - Step 3: Inspect negative direction mechanical end-stop
End-stop is intact and functional - Step 4: If motor genuinely overtraveled, investigate controller and brake
Address controller tuning or brake issues
How to Reset
1) Verify position feedback. 2) Check safe negative limit. 3) Inspect mechanical end-stop. 4) Reset requires safety acknowledgment.
Frequently Asked Questions
- Q: Is F7012 the same as F7011 but for the opposite direction?
Yes. F7011 is positive limit, F7012 is negative limit. Both are safety-critical position monitoring faults.
- Q: What if both F7011 and F7012 trigger simultaneously?
This indicates a position feedback error, as the motor cannot be beyond both limits simultaneously. Check the encoder and position reference.
Source: Rexroth IndraDrive Safety Integrated Manual, Bosch Rexroth AG
Category: PLC & VFD