Limit Switch Motor Control Circuit

Insert this into either black or white wire going to the motor.

Limit switch motor control circuit.

It is abbreviated com the other terminals are the normally open no. This permits them to be used in small spaces that would not be accessible to the larger device. Switch stops motor at limit and diode allows reversing of motor. It has three terminals.

In electrical engineering a limit switch is a switch operated by the motion of a machine part or presence of an object. The class of proximity switches operates by the disturbance of an electromagnetic field by capacitance or by sensing a magnetic field. In this particular case i show a low voltage control circuit and a 3 phase higher voltage motor. A very common form of latch circuit is the simple start stop relay circuit used for motor controls whereby a pair of momentary contact pushbutton switches control the operation of an electric motor.

A limit switch is used to control electrical devices by breaking and completing electrical circuits. The power input terminal is called the common terminal and is used to connect the switch to a power source. Do this one limit switch and diode at a time. Another type of limit switch often used in different types of control circuits is the micro limit switch or microswitch.

Simulate this circuit schematic created using circuitlab. You have to figure up down and appropriate diode polarity. Rarely a final operating device will be directly controlled by the contacts of an industrial limit switch but more typically the limit switch will be wired through a control relay a motor contactor control circuit or as an input to a programmable logic. 3 easy to build speed controller circuits for dc motors are presented here one using mosfet irf540 second using ic 555 and the third concept with ic 556 featuring torque processing.

Not sure of polarities on diodes. Micro limit switches are much smaller in size than an ordinary limit switch.