Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Emergency stop function activated. The drive has received an emergency stop command from the safety circuit. The motor is decelerating to a stop using the configured safe stop function.
Possible Causes
- E-stop button pressed by operator
- Safety relay tripped by a safety device (door switch, light curtain)
- Safety PLC issued E-stop command
- Emergency stop from remote HMI or supervisory system
Troubleshooting Steps
- Step 1: Identify which E-stop device was activated by checking safety relay indicators
Identified device is in the tripped (pressed/open) state - Step 2: Clear the E-stop device (release button, close door, clear light curtain)
All safety devices in healthy state - Step 3: Reset the safety relay or safety PLC
Safety relay resets and outputs 24V to drive safety input - Step 4: Acknowledge the safety fault in the drive via IndraWorks AS or HMI
Drive accepts reset and returns to operational state
How to Reset
1) Identify and clear the triggering E-stop device. 2) Reset safety relay/PLC. 3) Acknowledge in drive. 4) Verify motor is in safe position before re-enabling. Caution: Always determine the reason for the E-stop before resetting. E-stops are pressed for safety reasons.
Frequently Asked Questions
- Q: What is the difference between E-stop (F6034) and Safe Torque Off (F7043)?
E-stop (F6034) initiates a controlled safe stop (typically SS1 - Safe Stop 1, with deceleration). STO (F7043) immediately removes torque without controlled deceleration. E-stop is operator-initiated; STO can be automatic.
- Q: How do I find which E-stop button was pressed?
Check the safety relay or safety PLC diagnostic. Most safety relays have LED indicators for each channel, and safety PLCs log the triggering input in their diagnostic buffer.
Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD