Cause : OP STATION comes when keypad has been disconnected from drive whilst drive is running in local control. When a keypad is disconnected from a drive while it's running in local control, the operator loses the ability to:

• Monitor the drive's status and performance.
• Control the drive's speed, direction, or other parameters.
• Safely stop the drive in case of an emergency.

OP STATION fault in parker AC690 drive indicate that keypad disconnected from the drive while it's running in local control, this can potentially cause issues depending on the system and its configuration.