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Motor protector 17

2016-09-04 14:09  
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Motor protector 17
This motor protector circuit is composed of phase pulse detection circuit, monostable trigger circuit, control circuit and power supply circuit, it is shown in the figure 8-53. The phase pulse detection circuit is made of current transformers TAl-TA3, diodes VDl-VD5, steady voltage diode VS1 and capacitor C1. The monostable trigger circuit consists of transistor V, resistors R1-R3, potentiometer RP1, capacitors C2-C4, diode VD6 and time base integrated circuit IC1. The delay control circuit is composed of time base integrated circuit IC2, resistor R4, capacitors C5, C6, diode VD7, LED VL, relay K and AC contactor.