Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Safe acceleration peak exceeded. The safety system has detected that the motor acceleration exceeded the configured safe acceleration peak limit.
Possible Causes
- Acceleration setpoint too aggressive
- Load inertia lower than expected causing higher actual acceleration
- Controller gain too high producing acceleration overshoot
- Safe acceleration limit set too low for the application
Troubleshooting Steps
- Step 1: Check the safe acceleration peak limit parameter
Acceleration limit matches the machine safety assessment - Step 2: Review the acceleration setpoint in the motion profile
Setpoint acceleration is within the safe limit - Step 3: Verify actual load inertia matches the design value
Actual inertia matches calculated value - Step 4: Adjust acceleration limit or motion profile after safety review
Acceleration stays within safe limits during all modes
How to Reset
1) Check safe acceleration limit. 2) Review motion profile. 3) Verify load inertia. 4) Adjust parameters after safety review.
Frequently Asked Questions
- Q: Why does the safety system monitor acceleration?
Excessive acceleration can cause mechanical stress, load shifting, or loss of workpiece grip. The safety system ensures acceleration stays within limits determined by the machine safety assessment.
- Q: How do I set the safe acceleration limit?
Calculate based on mechanical component ratings, load stability requirements, and grip/holding force analysis. Document the calculation in the safety assessment file.
Source: Rexroth IndraDrive Safety Integrated Manual, Bosch Rexroth AG
Category: PLC & VFD