1. Tools & Materials Needed
Limit switch (confirm type: Normally Open NO / Normally Closed NC)
Wires (choose gauge based on voltage/current; stranded wire recommended)
Tools: Wire stripper, screwdriver, multimeter, terminal block (optional)
Power supply (DC/AC, matching the switch’s rated voltage)
Control device (e.g., PLC, relay, motor controller)
• Normally Open (NO): Contacts are open when untriggered, close when activated.
• Normally Closed (NC): Contacts are closed when untriggered, open when activated.
1. Power Off & Plan the Circuit
• Disconnect all power sources to avoid electric shock or damage.
• Sketch a simple wiring diagram, labeling switch terminals (COM common, NO/NC), power poles, and control device ports.
2. Connect Switch Terminals
• 2-Terminal Switches (Single Pole): Connect COM to the power positive/signal line, and NO/NC to the control device input (e.g., PLC I/O port).
• 3-Terminal Switches (COM + NO + NC): Use COM as the common terminal. Connect NO for circuits that activate when the switch is triggered, or NC for circuits that deactivate when triggered. (Example: For a "trigger-to-connect" function, use COM + NO; for "trigger-to-disconnect", use COM + NC)
3. Integrate into the Control Circuit
• For PLC/Relay Systems: Connect the switch output to the control device’s input terminal (e.g., PLC’s X0), with the other wire to the power negative/common.
• For Motor Control: Series the switch contacts with the motor relay coil circuit (triggering the switch cuts the coil power, stopping the motor).
4. Grounding & Mounting
• Ground metal-enclosed switches (connect PE terminal to equipment ground) to prevent static interference.
• Secure the switch to the mechanical limit position using screws/clips, ensuring the actuator (lever, roller) moves freely.
5. Power On & Test
①Restore power and manually trigger the switch; use a multimeter to check contact continuity.
②Run the connected equipment and test the limit function: the device should stop/reverse/alarm when the switch is triggered.
③If issues occur (e.g., loose connections, false triggers), power off and check wiring tightness or switch alignment.
1. Electrical Safety
• Never exceed the switch’s rated voltage/current; use a flyback diode for inductive loads (e.g., motors).
• Use shielded cables for long-distance wiring to reduce EMI interference.
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