Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Safe positive position limit exceeded. The motor position has exceeded the safety-configured positive end-of-travel limit.
Possible Causes
- Motor traveled beyond the positive safe position limit
- Position feedback error causing false position indication
- Safe positive limit parameter set incorrectly
- Mechanical end-stop failure allowing overtravel
Troubleshooting Steps
- Step 1: Check the safe positive 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 positive 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 positive limit. 3) Inspect mechanical end-stop. 4) Reset requires safety acknowledgment.
Frequently Asked Questions
- Q: How do F7011 and F7021 relate?
F7011 specifically triggers when the positive direction limit is exceeded. F7021 is the general safe terminal position fault. F7011 is a more specific sub-fault.
- Q: What is the typical reset procedure for F7011?
Clear the safety device that initiated the stop, verify the motor is within safe limits, then send a safety reset command from the safety PLC or safety relay.
Source: Rexroth IndraDrive Safety Integrated Manual, Bosch Rexroth AG
Category: PLC & VFD