The limit switch determines the area of permissible movement of machines and actuators. In a simple, mechanical way, it protects mechanisms against damage and at the same time allows for the positioning of key elements in automatic control systems. Thanks to this, this inconspicuous device has become popular and willingly used not only in very complex machines, but also in simple, several-element mechanisms. What is the secret to the reliability of limit switches?
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What is a limit switch?
The limit switch is an electromechanical device. The force applied to it activates a mechanism that triggers an electrical signal. It can be used for the operation of automatic control systems or to protect machines against damage. The signal transmitted by the limit switch can also be used to position the machine head. It moves to the limits of the working area until the appropriate switches are activated, thus redefining the working area. This procedure is performed from time to time to maintain high precision of the operations performed. It also allows you to position new tools or reset settings after a collision.
How to check if a limit switch is working properly?
The method of testing a limit switch varies depending on its application. In many cases, a set of two adjacent switches is used. One of them is used to determine the position of the mechanism (for example, it determines the maximum extension of the actuator), the second one serves as a protection if the first one does not work properly. To test a limit switch operating in this way, start the device and allow it to reach its final position.
Testing safety switches is similar. The check should be carried out regularly, without load, constantly checking whether the protection operates in the maximum position. The frequency of testing depends on the level of risk in the event of a circuit breaker failure. In the case of high-rise cranes, they are checked at the beginning of each shift. Less critical mechanisms may be checked during maintenance.
Top 10 best limit switches for use in industry
There are several types of limit switches, differing in structure, application and durability. Therefore, it is worth checking carefully which model you should purchase so that it meets all the criteria set by the device designer.
Emas L5 limit switch
The Emas L5 limit switch will work in most applications. The universal roller lever can be used in various types of mechanisms, but the price of such a model is not high.
Emas L51 limit switch
In other cases, especially when it comes to important protection, it is worth choosing the more expensiveEmas L51 limit switch . It shows higher durability and resistance to working conditions.
Limit switch Room KLM-3
The housing itself can meet various criteria for protection against water and dust. They are defined using the IP class. Our offer includes both simple Room limit switch KLM-3 , characterized by the lack of such protection (IP00),
Limit switch Room PAP1T31PW20
This is characterized by the highly resistant Room limit switch PAP1T31PW20 , with an IP65 class. This means protection against touching with a wire, dustproof and protection against water jets from any direction.
Promet LK-10R limit switch
There are limit switches such as the EATON LS-11S/L Lever with a roller or the Promet LK-10R limit switch . Both solutions work on a similar principle and are intended to determine the maximum states of mechanisms.
Schneider Electric M20x1.5 limit switch
The Schneider Electric M20x1.5 limit switch is characterized by a higher level of failure-free operation, thanks to which it effectively protects the system when the working area is exceeded.
Schneider Electric M20 limit switch
A more advanced model, the Schneider Electric M20 limit switch , has a status indicator. This way you can quickly determine whether the protection has worked. In this case, the end position is blocked until the button is released.
EATON LS-XRLA limit switch
Most models have a lever and a pulley that facilitate cooperation with other elements of the mechanism. However, the operating range of the switch may vary. The EATON LS-XRLA limit switch helps with this. It allows you to adjust the disc advance to the needs of a given machine. Many other models available from us also have such equipment.
Emas L5 limit switch
Another unusual solution is the Emas L5 limit switch . The limit switch in a plastic housing is equipped with a long, adjustable metal lever with a large rubber roller. Which increases the comfort of use
Do you need support when choosing? Ask!
The number of available solutions is very large. If you are not sure which one will work best in your situation, write or call us. We will be happy to advise you and show you the optimal solution. Rely on our knowledge and experience in this area.