Versatile Rotary Limit Switches for CNC Applications

Product Features

• Rotational Action Design: The lever arm can be positioned to allow switch actuation without interfering with the triggering structure
• Adjustable Lever: Rotation angle can be adjusted up to 90 degrees
• Free-Spinning Wheel: Located at the end of the lever to prevent hangups when moving in reverse after actuation
• Electrical Rating: Handles up to 5A at 250 volts (compatible with standard 5V digital signals or higher voltages)
• Easy Connection: No soldering required - uses convenient screw terminals
• Mounting Dimensions: Holes located at the back, measuring 21mm on center (width) and 56mm on center (length)

Terminal Configuration

• Normally Open (NO): Connect through terminals #3 and #4 (closest to the lever arm)
• Normally Closed (NC): Connect through terminals #1 and #2 (closest to the cable strain relief)

Installation Guide for Mach3 USB Controller

Required Materials

• Shielded cable with two conductors (22 or 24 AWG recommended)
• 24VDC power supply

Wiring Instructions

1. Prepare the Limit Switch:
   • Remove the terminal cover to access the connection points
   • Identify the NO terminals (marked between the terminal pairs)
   • Connect your cable to the NO terminals (#3 and #4)
2. Cable Considerations:
   • Use shielded cable to prevent interference with CNC controller input signals
   • The shield and ground wire must be connected together
   • If using cable with more than 2 conductors, ground all unused wires to prevent antenna effects
3. Controller Connection:
   • Connect the signal wire (red in example) from one NO terminal to IN1 on the Mach3 USB controller
   • Connect the ground wire (black), any unused wires, and cable shielding to the DCM terminal
   • For multiple switches, a terminal strip can be used to accommodate connections to DCM
4. Power Supply Connection:
   • Use a 2-conductor cable (shielding optional) between the 24VDC power supply and controller
   • Connect V+ from power supply to 24V terminal on controller
   • Connect V- (COM/GND) from power supply to DCM terminal on controller
5. Testing and Adjustment:
   • Test the switch function with the machine part that will engage it
   • Adjust lever length using the securing screw if needed
   • Adjust lever angle using the allen set screw as required
   • With default configuration, the switch should engage the reset function in Mach3

Connecting Multiple Switches

• Multiple switches in NO mode must be connected in parallel
• Connect one side of each NO terminal to IN1 (or to another switch on the same input)
• Connect the other side of each NO terminal to DCM (directly or via terminal strip)
• Test each switch to confirm proper function