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Limit Switches : What is limit Switch? It’s Application and Function


If you're employed with electrical machinery, then you’ve most likely detected the term “limit switch” before. However what specifically is it? And what's the operation of a limit switch? Below, we offer you with a basic summary of what limit switches are, their applications and the way to use them.

What is Limit Switch?

A limit switch is a part of electromechanical equipment that’s made up of an actuator connected to a series of contacts. These contacts permit the limit switch to detect the presence and proximity or absence of a material or object, usually in industrial settings. Depends on what the contact detects, the sensor moves an actuator, which in turn changes the state of an electrical circuit. This movement signals that some preset or fixed ‘limit’ has been reached.
Just because Limit Switches automatically detect preset limits, they eliminate the need for human workers to monitor those levels. This change makes operating everything from heavy machinery to industrial conveyor belts more precise and much easier but also much more reliable. As a result, production becomes more efficient, and work environments become safer and easier.

Application and Functions of Limit Switches

Uses of a Limit Switch

Limit switches are often used to tally items or materials so that when a limit is reached, the switch open or closes. This condition is frequently the case in industrial applications like assembly lines. For example, when the limit switch in a specific piece of instrument detects that it has added a predetermined number of components to a product, the switch moves the actuator, which in turn moves the piece of instrument away, and the product goes on to the next station.

Limit switches can also be used as safety interlocks to prevent machine parts from moving any further when a specific fixed point is reached. A good example of limit switch is an automatic garage door. Without a limit switch that stops the door when it reaches the bottom rail, the door would keep moving downwards and eventually crash into the ground, causing any kind of serious damage.
Limit switches can also be used as important part of a larger control system. When a specific limit is reached, the actuator can de-activate or activate a device to prevent malfunctioning or emergencies.

Operating Principle – How to Use a Limit Switch
The operating principle of Limit switch is rather simple, but as you can tell from the examples above, it’s integral to a host of commercial and industrial mechanical operations. Its most basic use is to slow down, stop, start or speed up operations in equipments. You can also integrate a limit switch into a wide range of electromechanical applications ranging from residential garage doors to material handling in warehousing and distribution.


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