1, Disconnect the loop switch and unlock all interlocking controls;
2, Check why the thermal relay is operating, and eliminate the hidden danger of action;
3, Reset the thermal relay to its original state;
4, Close the loop switch;
5, Use the contactor to close the loop for power supply, check whether the equipment is operating normally and whether the thermal relay continues to trip;
6, If everything is normal, connect all the controls and enter the circuit to be ready for use.