AFE1 Emergency Stop (Off2) Warning in ABB ACS880 Drive

AFE1 Emergency Stop (Off2) Warning in ABB ACS880 Drive indicates that the drive has received an Emergency Stop command using Stop Mode Off2. In Off2 mode, the drive immediately removes torque from the motor and allows it to coast to a stop.

AFE1 Emergency Stop (Off2) Warning in ABB ACS880 Drive


This warning can be generated either by an external emergency stop circuit or, in a master/follower system, by a command received from the master drive.

Possible Causes:

  1. Emergency stop push button activated.
  2. Safety circuit has issued an Off2 stop command.
  3. External control system initiated an emergency stop.
  4. Safety PLC activated the emergency stop function.
  5. Broken emergency stop circuit wiring.
  6. Faulty emergency stop switch.
  7. Incorrect control logic configuration.
  8. Master drive sent an Off2 command to follower drives.
  9. Maintenance or testing of the emergency stop circuit.
  10. Intermittent safety circuit signal.

Solutions:

  1. Verify that it is safe to restart the machine.
  2. Check whether an emergency stop push button has been pressed.
  3. Reset the emergency stop device to its normal position.
  4. Inspect the emergency stop circuit wiring.
  5. Verify safety relay operation.
  6. Check safety PLC outputs if used.
  7. Confirm external control signals are correct.
  8. Restart the drive after the emergency stop condition has been cleared.
  9. Monitor the event log for repeated occurrences.
  10. Inspect safety devices for faults or intermittent operation.

Additional Information

Off2 Stop Mode is a coast stop:

  • Motor torque is removed immediately.
  • The motor is not actively decelerated by the drive.
  • The motor coasts to a stop based on load inertia.

This stop mode is commonly used in:

  • Emergency stop systems.
  • Safety circuits.
  • Machine protection systems.

Master/Follower Configuration Information

In a Master/Follower configuration, AFE1 may appear on a follower drive even though no actual emergency stop occurred.

After the master performs a:

  • Ramp Stop (Off1) or
  • Ramp Stop (Off3)

the master automatically sends a brief:

  • 10-millisecond Off2 command

to the follower drives.

In this case:

  • The warning is informational only.
  • No corrective action is required.
  • The event is logged in the follower drive history.

Recommended Troubleshooting Sequence

  1. Determine whether the drive is operating as a standalone drive or follower drive.
  2. Check the status of emergency stop push buttons.
  3. Inspect safety relays and safety circuits.
  4. Verify emergency stop wiring.
  5. Check PLC or safety PLC commands.
  6. Review the event log for the source of the Off2 command.
  7. Reset the emergency stop condition.
  8. Restart the drive.

Common Symptoms

  • Motor coasts to a stop.
  • Drive stops immediately.
  • Emergency stop indication active.
  • Safety circuit interruption.
  • Event logged as Off2 stop.

Related Stop Modes

Stop ModeDescription
Off1Ramp Stop
Off2Coast Stop
Off3Fast Ramp Stop

Related Warnings and Faults

CodeDescription
AFE1Emergency Stop (Off2) Warning
AFE2Emergency Stop (Off1 / Off3) Warning
A5A0Safe Torque Off Warning
5091Safe Torque Off Fault

Proper maintenance of emergency stop circuits, safety relays, and control wiring will help prevent unintended AFE1 Emergency Stop (Off2) Warnings in ABB ACS880 drives.

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