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Motor protector 8

2016-09-01 20:30  
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Motor protector 8
This motor protector circuit is composed of power supply circuit, current detection circuit and protection control circuit, it is shown in the figure 8-44. The power supply circuit is made of power transformer C4, C5, current limiting resistor R8 and steady voltage diode VS, this circuit can produce +20V voltage, it feeds to relay K and the drive cirucit. The current detection circuit consists of current converter LA1, LA2, LA3, rectifier diodes VD1-VD2, fliter capacitors C1-C3. The protection control circuit is composed of resistors R1-R7, transistors V1-V3, relay K, AC contactor KM1, KM2, and starter button S1, stop button S2.