The equipment is manually switched from line power supply 2 to line power supply 1. Reset the device, confirm that the line power supply 1 indicator is on, the line power supply 2 indicator light is on, and the running light shows normal; when manually starting the switch, you should disconnect 1DL first, and pass After the delay, close the 2DL and supply power from the incoming power supply 2. The measurement outlet and signal should be correct, and the action time should be correct.