Abnormal temperature sensor or excessive current. The fault light of the heating controller of Junkai 60 kW electromagnetic boiler flashes twice slowly and then twice. The reason is that the temperature sensor is abnormal or the current is too large, and the coil is short-circuited.

1, IGBT temperature sensor is abnormal. The IGBT temperature sampling of the electromagnetic heating controller selects NTC thermistor.

2. Overcurrent When the current is greater than 120A, the controller will automatically detect it. If the current is greater than 120A for three consecutive times, the display window 1 will display "E2" and flash, the "overcurrent" indicator will flash, and the buzzer will ring twice every five seconds.

3, coil short circuit This controller has the function of coil short circuit detection, and protects IGBT from damage caused by coil short circuit by detecting UCE saturation voltage drop of IGBT module.