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Put a Jumper Wire Between Wires J2-1 and J2-4

ClosedOverview/Background Information

If you want background information on this problem, go to How Limit Switch Commands are Processed.

ClosedWhat Steps Have I Already Taken?

You've determined that:

  • The machine has an open limit switch circuit
  • The X Limit light is on

Follow the Troubleshooting Steps to determine the cause of the open limit switch circuit.

Before You Begin

If you haven't yet done so:

  1. Power on the machine and the PathPilot® controller.

    1. Turn the Main Disconnect switch to ON on the right side of the electrical cabinet.
    2. Twist out the Emergency Stop button on the operator panel, which enables movement to the machine axes and the spindle.
    3. Press the Start button on the operator panel.

  2. Open the electrical cabinet door.

    WARNING! Electrocution Hazard: When servicing the machine from inside the electrical cabinet, always use caution. Points in the electrical cabinet have high voltages that can electrocute or shock you. Even after you've powered off the machine, electronic devices in the electrical cabinet may retain dangerous electrical voltages. Only qualified electrical machinery technicians should perform maintenance or troubleshooting procedures inside the electrical cabinet while power is still on.

  3. Locate the Machine Control Board.

Troubleshooting Steps

  1. Locate wires J2-1 and J2-4.


  2. Put a jumper wire between wires J2-1 and J2-4. You can use any small length of wire as a jumper wire.

  3. From the PathPilot® interface, on the Status tab, locate the X Limit light.

Does the X Limit light go out?

  • Yes: Go to Put a Jumper Wire in the X-Axis Limit Switch Box.
  • No: This means that the Machine Control Board is defective and must be replaced. Tormach Technical Support for guidance on how to proceed.