Cause : Emergency stop comes when the drive has detected an activation of the emergency stop circuit connected to its multi-function input terminals.

The EF1 error code on your Delta MS300 drive indicates an Emergency Stop triggered by an external circuit. This means the contact of MIx=EF1 is ON, the output stops immediately and displays EF1 on the keypad. The motor is in free running.

• Verify if the system is back to normal condition, and then press “RESET” key to go back to the default.