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Robert DeleonAug 8, 2025
What to do if green POWER ON indicator is illuminated, START command is given, DC ON indicator is illuminated, but there is no high frequency and no pilot arc in Hypertherm HySpeed HT2000?
- CcherylmooreAug 8, 2025
If your Hypertherm Welding System has power, but lacks high frequency and a pilot arc, consider these potential causes: * Check for a spark between the spark gap electrodes. Clean, align, and reset the electrode gaps to .020" (0.51 mm) if needed. Ensure the electrode surfaces between the gaps are flat; replace if rounded and reset the gap. * Inspect the high voltage transformer T1 in the RHF console for overheating, and replace T1 if necessary. * Confirm there is 120VAC at T1 after the START command is given. Note that door interlock switches S1 and S2 must be closed to pass the START sequence. * If there is no 120VAC at T1, there may be a problem with either PCB4 or PCB2. See sheet 4 of 13 in Section 10 for location of the relay that controls RHF transformer T1.
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