Limit switch wiring method How to determine the positive and negative poles of a limit switch
Limit switch wiring method A universal limit switch consists of a housing, an interconnection system and an operating head. First, everyone should install the limit switch to the required position and then connect the wires. It is also necessary to understand the specific meaning of each letter. The number on the limit switch indicates normally closed, the number indicates the common terminal, and the number indicates normally open. Only by understanding the meaning of each letter can the limit switch be connected and used correctly. There are numbers on the switches too. 123 means normally open and 456 means normally closed, so you can choose according to actual needs. Generally speaking, the power supply is connected to the 7th and 8th, which can provide power support for the limit switch.
How to determine the positive and negative poles of the limit switch
Limit switches usually have two terminals, one of which is positive (positive power terminal) and the other is negative (ground terminal). To determine the positive and negative poles of the limit switch, you can follow the following steps:
1. Observe the appearance of the limit switch: Some limit switches may have positive and negative polarity symbols marked on the casing. You can check the markings on the casing to determine.
2. Check the product specifications or instructions: Limit switches usually have corresponding product specifications or instructions, which may contain information about the positive and negative poles. You can refer to these documents to determine the correct connection method.
3. Check the terminal marks: Some limit switches may have positive and negative polarity symbols or labels on the terminal blocks. You can check these marks to determine.
4. Use a multimeter to test: If the positive and negative poles cannot be determined by other methods, you can use the voltage measurement function of the digital multimeter to make further judgments. First, connect the limit switch terminals to the corresponding test leads on the multimeter. Next, with the power turned on (if applicable), connect the multimeter's red test lead (positive terminal) to one terminal and the black test lead (negative terminal) to the other terminal. If the multimeter shows positive voltage, connect the red test lead to the positive terminal and the black test lead to the negative terminal. If the multimeter shows negative voltage, the connections are reversed.
How to judge whether the limit switch is good or bad
To judge whether the limit switch is good or bad, you can follow the following steps:
1. Observe the appearance: Check the appearance of the limit switch for obvious physical damage, such as cracks, deformation, rust, etc. If the appearance is severely damaged, it may affect the normal operation of the limit switch.
2. Check the contacts: Limit switches usually have contacts that are used to make or break a circuit. Check that the contacts are clean, free of oxidation or corrosion, and that they are not loose or damaged. Abnormal contacts may cause circuit disconnection or poor connection.
3. Test electrical performance:
a. Use a multimeter or power supply to connect the limit switch and measure the resistance between the contacts. Under normal circumstances, the contact resistance in the closed state should be lower than the standard value within the normal operating range.
b. Operate the limit switch and check whether the contact is stable and can switch reliably. Verify that the switch triggers at the appropriate time and location.
4. Check the signal output: If the limit switch has a signal output, such as a switching output or a safety signal output, you can check whether the signal is output correctly by connecting an appropriate circuit or device.
If any obvious problems are discovered during the above steps, such as damaged contacts, abnormal resistance, or unstable signal output, the limit switch may need repair or replacement.
Review Editor: Huang Fei
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