Motor protector circuit diagram 13

Published:2011/5/29 2:03:00 Author:Lucas | Keyword: Motor protector | From:SeekIC

The motor protector circuit is composed of the power circuit, phase sequence detection circuit, trigger, and protection control circuit, the circuit is shown as the chart. Power circuit is composed of the power transformer T, bridge rectifier UR and filter capacitor C1. Phase sequence detection circuit is composed of the diodes VD1 ~ VD3, resistors R1 ~ R6 and Zeners VS1 ~ VS3. Trigger is composed of the D1 ~ D4 in the NAND gate IC. Protection control circuit consists of transistors V1, V2, resistors R7 ~ R9, capacitor C2, thyristor VT, and relay KA. Start button S1, stop button S2, knife switch Q, fuse FU, thermal relays KR and KM form the original control circuit of motor. R1 ~ R3 and R9 select 1W metal film resistors; M ~ R8 select 1/4W carbon film resistor or metal film resistors.



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