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The ohmic probing system on the 1300PL relies on a calibrated resistance value between the torch cap and the workpiece. If you do not calibrate your ohmic probe, you may find that it is triggered by water on the work piece workpiece or inside the torch cap.

Tools

• Phillip’s Phillips head screwdriver

Step 1

Open the electrical cabinet and identify the Tormach TCHT Board (PN 39096).

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Depending on which revision of the board you have, the sensitivity potentiometer will look different.

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If the LED did not light up, identify adjustment screw RV1 on the TCHT board (indicated in the image above). Increase the sensitivity by rotating the screw clockwise, 1/16th turn at a time, until the workpiece is detected.

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Splash a small puddle of water onto your workpiece. Jog the torch cap down until it is contacting the water but not the workpiece itself. If the LED is on, your TCHT sensitivity is too high. Decrease the sensitivity 1/16th of a turn at a time until the LED goes out.

If you are having trouble adjusting the ohmic probing system or the LED never comes on, visit Ohmic Probe Does Not Trigger, for troubleshooting tips.