Motor protector 4

Published:2011/6/27 5:07:00 Author:Nicole | Keyword: Motor, protector | From:SeekIC

This motor protector circuit is composed of current detection control circuit and delay control circuit, it is shown in the figure 8-40. The current detection control circuit is made of resistors R0-R5, transistors V1-V3, capacitor C1, diodes VD1, VD2 and Zener diode VS1, VS2. The delay control circuit consists of resistors R6-R8, capacitor C2, transistors V4, V5 and relay K. S1 is starter button, S2 is stop button, KM is AC contactor. After S1 is pressed, V5 is saturation conduction, K pulls in, its normally open contacts K1, K2 are turned on, KM action makes motor M operated, at the same time, the current detection control circuit starts to work.



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