Z Crash on Touch Off – Ohmic Sensing

This issue typically means:

• The ohmic sensor didn’t sense the material

• Z was not zeroed properly

• The material is rusty or poorly conductive

Rusty material must be damp to close the ohmic circuit and allow proper sensing.

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Troubleshooting Checklist

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1. Check the Ohmic Clip

• The clip must contact the plasma tip shield, not the nozzle.

• Test: Touch the torch tip to the metal. Input light 3 or 9 should come on:

  • Input 9 for 2021+ Star Lab models

  • Input 3 for older models

• If input doesn’t light up, continue to next step.

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2. Bypass the Clip to Test

• Manually touch the ohmic wire to the metal.

• If the input light works now, your clip is bent → Replace the clip.

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3. Check the Feather Touch Module

• Location:

  • On 2020+: Behind gantry (inside enclosure)

  • On 2019 and older: On top of the carriage reduction unit

• Make sure the plug labeled "TIP / PLATE" is connected firmly.

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4. Check AC Adaptor for Feather Touch

• Thin black wire should connect to a small 2"x1"x2" AC adaptor

• Plug this into a power strip, not the control box

• A small LED should be ON at the connection point — if not, check plug

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5. Check Plate-Side Wiring

• Under the long-axis cable carrier, behind the motor

• Look for a ground wire attached to a small bolt on the upright aluminum bridge mount

• Make sure the bolt/wire is connected and not corroded

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6. Replace Wire to the Tip

• If all else fails, replace the first 12 inches of wire going to the torch tip

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Still Not Working?

Call technical support:
📞 1-855-433-3689