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Motor protector circuit diagram 10

2016-09-02 10:14  
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Motor protector circuit diagram 10
The motor protector circuit is composed of voltage detection circuit and protection control implementation circuit, the circuit is shown as the chart. Starting control circuit is composed of stop button S1, start button S2, AC contactor KM ( the original motor starting circuit). Voltage detection circuit is composed of the diodes VD1 ~ VD3, voltage regulator diodes VS1 ~ VS3, resistors R1 ~ R6, capacitors C1 ~ C3 and optocouplers VLC1 ~ VLC3. Protection control circuit consists of transistors V, relay K, diode VD4 and resistor R7. If one phase of the three-phase AC power is open-phase, the optocoupler in voltage detection circuit is turning off, V could not turn on, K does not pull in, disconnecting S2 will make KM released immediately to achieve fault phase automatic protection purpose. R1, R3 and R5 use 1 ~ 2W metal film resistors.