TL;DR
If the Powermax fires but no arc starts, check for a damaged nozzle, loose torch lead, or loss of air flow before suspecting internal power supply faults.
What you might see
- trigger pulled but no arc initiates
- power supply LED shows fault code
- air flows normally but plasma does not ignite
- torch clicks once but arc does not transfer
Likely causes
Worn or damaged electrode with no emitter material remaining
Nozzle orifice blocked or electrode in contact with nozzle (double-arc condition)
Torch lead connection loose at the power supply or torch body
Air pressure below minimum threshold preventing pilot arc formation
Required tools
- Replacement consumable set
- Air pressure gauge
- Multimeter for torch lead continuity check
- Hypertherm operator manual for fault code reference
Safety first
- Do not disassemble the torch while the unit is powered on. Turn off the Powermax and bleed the air before touching consumables.
- High-frequency pilot arc ignition produces radio frequency interference. Do not operate near sensitive electronics without shielding.
Procedure
- 1
Turn off the Powermax and release the air trigger to depressurize the torch.
- 2
Disassemble the torch and inspect the electrode, nozzle, and shield for obvious damage. Replace any component that is visibly worn, cracked, or has melted material bridging the electrode and nozzle.[1]
- 3
Confirm the torch lead is fully seated and locked at the power supply connection. A partially connected lead will prevent pilot arc formation.[1]
- 4
Check the air inlet pressure at the power supply using a calibrated gauge. It must be at or above the minimum for the selected amperage.
- 5
Reconnect everything, power on, and attempt a torch-on-plate arc start. Observe the front panel fault LED.
- 6
If the unit shows a specific fault code, consult the Hypertherm operator manual fault code table for the meaning of that code.
- 7
If no fault is shown and consumables are new, test with a known-good torch body to rule out a torch body fault before servicing the power supply.
Sources
Hypertherm Hypertherm Powermax 65 / 105 / 125 Plasma Cutting System general technical documentation, Hypertherm
Hypertherm Powermax 65 / 105 / 125 operator manual, fault diagnosis and torch inspection (general)
More guides for Hypertherm Hypertherm Powermax 65 / 105 / 125
How to reduce premature consumable wear on a Hypertherm Powermax 65 / 105 / 125
Consumables wearing out in less than 500 starts usually means incorrect standoff distance, wrong air pressure, or start / stop technique. Verify air pressure at the torch inlet before changing consumables.
How to reduce excessive dross on cuts with a Hypertherm Powermax 65 / 105 / 125
Excessive dross is most often a speed or cut height problem. Reduce speed for top dross and increase speed for bottom dross. Always re-check standoff after changing cut parameters.
Stop fixing the same fault twice.
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