Use ohmic contact sense

You can use internal or external ohmic contact sense. No action is necessary for internal ohmic contact sense. To use external ohmic contact sense, make the following modification to the ohmic wiring inside of the TorchConnect™ console.

When you work with ohmic contact sense, it helps to know the following conditions related to ohmic relays:
  • The ohmic relay is open during ignition, when cutting with a water process, or when the remote on-off switch is in the OFF position.
  • The ohmic relay is closed and ohmic contact is enabled if none of the above conditions are true.
  • With external ohmic contact sense, the relay is still used to help isolate the ohmic circuit from high voltage.
  1. Remove the power from the cutting system:
    1. Set the line-disconnect switch to the OFF position.
    2. Make sure that the power-indicator Light Emitting Diode (LED) on the TorchConnect console is not illuminated.
  2. Disconnect the ohmic wire from J3 on the ohmic Printed Circuit Board (PCB) in the TorchConnect console.
  3. Connect the ohmic wire that you removed from J3 to J4 pin 1.
  4. Remove the plug from the sheet metal on the TorchConnect console.

    The plug is below the torch lead connection, as shown.

    This image shows the plug that you must remove to get to the ohmic wire inside a TorchConnect console.
  5. Put the external ohmic-sense circuit through the hole in the sheet metal on the TorchConnect console and then connect the external ohmic-sense circuit to J4 pin 2 on the ohmic PCB.

    Refer to Example of external ohmic contact sense.