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Elevator motor overspeed controller

2016-09-02 18:52  
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Elevator motor overspeed controller
The elevator motor overspeed controller circuit is composed of power supply circuit, LED indication circuit and speed measurement control circuit, it is shown in the figure 8-66. The power supply circuit is made of power transformer T, rectifier diodes VD1-VD4, filter capacitors C1, C2 and there terminals steady voltage integrated circuit IC2. The LED indication circuit consists of LED VL1, VL2 and resistors R4, R5. The speed measurement control circuit is composed of resistors R1-R6, potentiometers RP1, RP2, operation amplifier integrated circuit IC1(N1, N2), diodes VD5-VD7, transistor V and relay K.