Power to the inverter, start the inverter to run forward, motor overload protection, when the fountain is not running as a music fountain, disconnect the inverter. After power supply to the inverter, the inverter has a warm-up time, so the inverter cannot be started to run in the forward direction immediately. After 30S of delay, the inverter can be started in the forward direction and 4 inverters can be started at the same time.