How to Choose Top-roller Plunger Actuator Limit Switch Company?

A limit switch is a device that uses the collision of mechanical moving parts to make contact action to turn on or off the control circuit, thus achieving certain control purposes. It works in conjunction with other devices to form more complex automation equipment in industry. Therefore, choosing a more appropriate limit switch will make the whole automatic control system more reasonable and efficient.

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How to set limit switches

Setting limit switches depends on the type and location of the limit switches you are using.

The first thing you need to do is to determine where your limit switch will be located and what it will be used to detect. This will give you an idea of what size and what type of switch is needed.

Once you have the correct limit switch, you will need to secure it in its position. A standard limit switch will have pre-drilled holes where the switch can be held in place by fixings. If you are installing a limit switch for the first time, you may need to drill some holes. To check the position of the switch, you should first secure the switch in place to make sure it can be actuated properly.

The next step is to wire the limit switch into the circuit. The contacts can be normally open, normally closed, or a combination of both. Finally, you should always test that your limit switch is actuated in the correct position and make adjustments if necessary.

Sealed plunger actuator Limit Switch

Why Use Limit Switches

We use limit switches for a number of different reasons. Let's take a look at some of the most common reasons/applications we use them.

To detect a presence or absence of a level

Counting objects and items

Detecting a range of motion

To detect positioning within a system

To maintain travel limits

They can disconnect the circuit when an unsafe condition occurs

Detects the speed of objects

Selecting limit switches

There are several key points in selecting a limit switch.

1. Select limit switches according to the application scenario and the object to be controlled.

When the machine is not moving fast, a general-purpose limit switch is usually used. When the machine is running in a path that is not suitable for installing a roller plug limit switch, a roller bar limit switch should be used.

In addition, when very high efficiency, reliability and accuracy are required, another type of switch, the proximity sensor, should be selected.

2, Select the structure form of limit switch according to the movement characteristics of the machine.

Housing: According to the load of limit switch, light load and medium load, the housing material is mostly plastic. For heavy load and super heavy load, the housing material is mostly metal. Therefore, a suitable housing needs to be selected.

Actuator: Different actuators are selected according to the shape and direction of movement of the detection target. Types of actuators include roller plungers, top plungers, roller levers, adjustable roller levers, adjustable lever levers, fork levers and coil springs.

3, Select limit switches according to the rated voltage and rated current of the control circuit.

4, Select the appropriate limit switch according to environmental factors such as ambient temperature, vibration and shock resistance, and protection level. For example, waterproof limit switches can be used in industrial applications requiring water, oil and dust resistance.

 adjustable lever actuator IP68 waterproof limit switch

Points to note

In addition to the above points, the following details should be noted.

Contact module: Select different numbers of contacts, slow-acting contacts or fast-acting contacts according to different needs.

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Operating speed: Indicates the maximum permissible triggering speed. If this speed is exceeded, the limit switch may malfunction or be damaged by excessive force.

Inlet module: There are several inlets that comply with different standards. In addition to the direct line type of the commonly used models, standard cable types such as ISO, DIN, NPT, etc. are often used. The difference only lies in the different inner diameters of the limit switch inlet threads and the different pitch caused by the different brake types.

Minimum force: The minimum force required to trigger. There are usually two types of minimum force (N) and minimum torque (Nm).

Working life: Working life can be divided into mechanical working life and electrical working life.

The above are some of the suggestions given by TMAZTZ about choosing limit switches. Of course, if you are not sure about the selection of limit switches, you can send us an email. We have professional engineers who will patiently solve all your limit switch related problems.

Selecting the right limit switch is essential to ensure proper functionality and safety in various industrial applications. Limit switches are electromechanical devices used to detect the presence or absence of an object and provide feedback to control systems. They are commonly used in automation, manufacturing, and process control systems to monitor and control the movement of machinery and equipment. In this guide, we will outline the key factors to consider when selecting a limit switch.

Environmental Conditions:

The first consideration when selecting a limit switch is the environmental conditions in which it will be used. Different environments can pose challenges such as extreme temperatures, humidity, dust, vibrations, or exposure to chemicals. Ensure that the limit switch is designed to withstand the specific environmental conditions of the application. Look for switches with appropriate environmental ratings, such as IP (Ingress Protection) ratings for dust and moisture resistance, or NEMA (National Electrical Manufacturers Association) ratings for environmental protection.

Operating Speed and Force:

Consider the operating speed and force required for your application. Some limit switches are designed for high-speed applications, while others are more suitable for slower or heavy-duty operations. Determine the speed at which the object or machinery will be moving and select a limit switch that can respond accurately and reliably within that speed range. Similarly, consider the force or pressure that the switch will encounter and ensure it can handle the required load.

Sealed Plunger Actuator Limit Switch

Actuator Type:

Limit switches come with different types of actuators, which are the mechanisms that make physical contact with the object being sensed. Common actuator types include plunger, roller lever, whisker, rod lever, and spring-loaded. The choice of actuator type depends on factors such as the shape, size, and movement of the object to be detected. Consider the physical characteristics of the object and select an actuator that will provide reliable and consistent contact.

Contact Configuration:

Limit switches offer different contact configurations, including normally open (NO), normally closed (NC), and changeover (CO) contacts. The contact configuration determines the state of the switch when it is not actuated and when it is actuated. Select the appropriate contact configuration based on the requirements of your application and the desired behavior of the control system.

Electrical Ratings:

Evaluate the electrical ratings of the limit switch to ensure compatibility with your electrical system. Consider factors such as voltage, current, and maximum switching capacity. Ensure that the switch can handle the electrical load and voltage levels required by your application. Pay attention to the maximum switching capacity to prevent damage or premature failure of the switch when handling high currents or voltages.

Mounting and Connection Options:

Consider the mounting and connection options available for the limit switch. Common mounting types include panel mount, surface mount, and DIN rail mount. Choose a mounting option that suits the specific installation requirements and the available space. Additionally, consider the connection options, such as screw terminals or quick-connect terminals, and select the one that is most convenient for your wiring setup.

Safety and Certification:

If your application involves safety-critical functions or compliance with specific industry standards, ensure that the limit switch meets the necessary safety and certification requirements. Look for switches that are certified by recognized organizations or comply with industry standards such as UL (Underwriters Laboratories), CE (Conformité Européene), or IEC (International Electrotechnical Commission).

Reliability and Durability:

Reliability and durability are crucial factors when selecting a limit switch. Look for switches from reputable manufacturers known for producing high-quality and reliable products. Consider the expected operational lifespan of the switch and any maintenance requirements. Additionally, check for features such as built-in surge protection, self-cleaning contacts, or sealing options to ensure long-term reliability and minimize downtime.

Application-specific Features:

Depending on your specific application requirements, consider any additional features or functionalities that may be beneficial. For example, some limit switches offer LED indicators for visual status indication, adjustable sensitivity for fine-tuning, or wiring options for ease of installation. Assess your application needs and identify any additional features that can enhance the performance and functionality of the limit switch.

Cost Considerations:

While cost should not be the sole determining factor, it is important to consider the budget for your project. Compare prices and features among different limit switches to find the best balance between cost and performance. Remember to prioritize quality, reliability, and compatibility with your application requirements over solely focusing on the price.

In conclusion, selecting the right limit switch involves considering factors such as environmental conditions, operating speed and force, actuator type, contact configuration, electrical ratings, mounting and connection options, safety and certification, reliability and durability, application-specific features, and cost considerations. By carefully evaluating these factors and choosing a limit switch that aligns with your specific needs, you can ensure optimal performance, safety, and functionality in your industrial applications.

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