Corrective action
1. Make sure that the input-line voltage is ±14% of nominal.
Refer to General input power requirements on page 44.
2. Remove the power from the cutting system.
3. Remove the cover from the contactor.
4. Examine the contacts for excess wear, and replace the contactor if necessary.
5. Examine the following contactor components for loose connections:
a. Contactor
b. Input to chopper
c. Power cord
6. Tighten loose connections if found.
7. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Troubleshooting for a main contactor fault
Diagnostic code 764
Diagnostic code 764 occurs when the current for the main contactor is too high.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
764 The main contactor driver finds an overcurrent con-
dition.
All models None • Set process
• Remote on-off
Corrective action
1. Examine the main contactor and wiring, and replace them if you find damage or excess wear.
2. Make sure that you have the most recent XPR firmware.
You can log in into the Xnet at www.hypertherm.com to download it.
3. If you cannot find or correct the problem, speak to your cutting machine supplier or regional
Hypertherm Technical Service team.
Diagnostics and Troubleshooting
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811530 Instruction Manual XPR460
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