Green light: flashing indicates normal operation, while not on or constantly on indicates abnormal operation.

Yellow light off, red light flashing: Long delay fault

Yellow light flashing and red light off: Overload warning (slow flashing greater than 90% of the long delay setting value, fast flashing greater than the long delay setting value)

Yellow light on, red light flashing: Short delay fault

Yellow light on, Red light on: Ground fault

Flashing yellow light and flashing red light: Instantaneous fault

Communication indication: If there is a cabinet door unit, regardless of whether there is an upper computer, it indicates communication with the cabinet door unit. If there is no cabinet door unit, but there is an upper computer, it indicates communication with the upper computer.