Hypertherm XPR460 - Page 306

6. Measure the ohms (Ω) between the nozzle and the workpiece.
Less than 3 ohms (Ω) is good. A value more than 3 ohms (Ω) identifies a faulty connection between
one of the following:
□
The torch and the ignition console
□
The ignition console and the plasma power supply
□
The plasma power supply work cable and the workpiece
7. Examine the work cable, and replace the cable if you find damage or excess wear.
8. Examine the pilot-arc circuit between these connection points:
□
From the plasma power supply to the gas connect console
□
From the gas connect console to the TorchConnect console
□
From the TorchConnect console to the torch receptacle
9. Does the pilot-arc circuit have damage?
If yes... Replace the pilot-arc cables that have damage.
If no... Replace the torch and torch receptacle.
10. Release the pilot-arc relay, and measure the ohms (Ω) between the nozzle and workpiece.
The acceptable range is 9,000 ohms (Ω) – 11,000 ohms (Ω). If the ohms (Ω) value is low –
approximately 5,000 ohms (Ω) or less – examine the pilot-arc circuit between these connection points.
Look for insulation damage and short circuits to ground:
□
From the plasma power supply to the gas connect console
□
From the gas connect console to the TorchConnect console
□
From the TorchConnect console to the torch receptacle
Diagnostics and Troubleshooting
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811530 Instruction Manual XPR460