Hypertherm Powermax105 Service Manual - Manual (Page 176)

TroubleshooTing and sysTem TesTs
8-38
powermax
105 Service Manual
Problem Meaning Causes Solution
When pressing the torch
trigger or start switch,
gas flows from the torch,
but the torch does not
fire or fires for only a
short duration.
Worn or damaged
consumables.
• Overused or
improperly
installed
consumables.
• Replace consumables.
Damaged torch or
lead assembly.
• Electrode is not
moving properly
in the torch or
the torch lead is
damaged.
• Perform Test 6.
Insufficient or
excessive gas flow.
• Gas pressure is
too high or too
low, or the gas
supply is leaking
or restricted.
• Ensure the inlet pressure is 5.9 to 9.3
bar (85 to 135 PSI).
• Repair air leaks or restrictions.
• Manually adjust the gas pressure on the
power supply.
Poor air quality.
• Air filter element
is dirty.
• Moisture or
contaminants in
the gas supply
line.
• Replace the air filter element.
• Add appropriate filtration and purge the
lines with nitrogen to flush out oil and
moisture.
Insufficient input
power.
Undersized
electrical supply
installation:
• Breaker or fuse.
• Supply wire.
• Extension cord.
• Verify that the external electrical
power is installed according to the
Specifications section.
Faulty inverter IGBT
module or power
board.
• Faulty inverter
IGBT module or
power board.
• Use an IGBT tester to check the inverter
IGBT module
Capacitor voltage
imbalance on the
power board.
• Faulty resistors
on the power
board or faulty
bulk capacitor(s).
• Perform Tests 1, 2, or 3.
• If the voltage across the capacitors is
not balanced, replace the power board.