The limit switch defines the area of permissible movement of machines and actuators. In a simple, mechanical way, it protects mechanisms from damage, and at the same time allows for positioning the position of key elements in automatic control systems. Thanks to this, this inconspicuous device has become popular and is eagerly used not only in very complex machines, but also in simple, multi-element mechanisms. What is the secret of the reliability of limit switches?
Check the limit switches at the Onninen wholesaler
What is a limit switch?
A limit switch is an electromechanical device. The force applied to it activates a mechanism that releases an electrical signal. It can be used to operate automatic control systems or to protect machines from 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, in order to redefine the working area. This procedure is performed periodically to maintain high precision of the operations performed. It also allows you to determine the position of new tools or reset the settings after a collision.
How to check if the 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 other acts as a safety device in a situation where the first one does not work properly. To test a limit switch operating in this way, the device should be started and allowed to reach its final position.
The same applies to testing safety switches. The test should be carried out regularly, without load, always checking that the safety device will operate at the maximum position. The frequency of testing depends on the level of risk if the switch fails to operate. In the case of high-risk cranes, they are tested at the start of each shift. Less critical mechanisms may be tested during maintenance.
Top 10 Best Limit Switches for Industrial Use
There are several types of limit switches, differing in construction, application and durability. Therefore, it is worth checking carefully which model to buy so that it meets all the criteria set by the device designer.
Emas L5 limit switch
In most applications , the Emas L5 limit switch will work well. The universal lever with a roller can be used in various types of mechanisms, while 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 is more durable and resistant to working conditions.
Limit switch Room KLM-3
The housing itself can meet various criteria for protection against water and dust. They are defined by the IP class. In our offer you can find both simple Limit Switch Pokój KLM-3 , characterized by the lack of such protection (IP00),
Limit switch Room PAP1T31PW20
This is characterized by the highly resistant Limit Switch Pokój PAP1T31PW20 , with IP65 class. This means protection against touching with a wire, dust-proof and protection against water jets from any side.
Promet LK-10R limit switch
We can distinguish the limit switch of the type EATON LS-11S/L lever with a roller or the Promet LK-10R limit switch . Both solutions operate 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 allows you to quickly determine whether the protection has been triggered. 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, which facilitate cooperation with other elements of the mechanism. The range of the switch's operation may vary, however. The EATON LS-XRLA limit switch helps with this. It allows you to adjust the pulley's extension to the needs of a given machine. Many other models available from us also have such equipment.
Emas L5 limit switch
The Emas L5 limit switch is also an unusual solution. The limit switch in a plastic housing is equipped with a long, adjustable metal lever with a large rubber roller. This increases the comfort of use
Need help 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 and point you to the optimal solution. Rely on our knowledge and experience in this area.