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19 -
No.
Problem
Root cause
What to do
6
The ''machine on''
light is lit. Digital
display meter and
fan operational.
No high-frequency
discharge sound
when torch trigger
is pressed. Gas
out. No load
output.
Poor contact on primary wire
of arc ignition coil.
Fasten the connecting wire.
Oxidation of the spark-gap
assembly or spark gap too
great.
Remove oxide layer from
spark gap surface or
re-adjust the gap to 1mm.
Damaged high-frequency arc
ignition device.
Determine which parts are
damaged and replace.
Poor contact of high
temperature wire terminal of
main transformer.
Tighten the terminal blocks.
7
The ''machine
light'' is lit. Digital
display and fan
operational.
Overheating and
over-current lights
are lit. No no-load
output.
Over-current protection.
Shut off the machine and
reboot.
Overheating protection.
Auto-recovery after 5 to 10
minutes.
Failure of inverter circuit
Replace IGBT
Secondary rectifier damaged. Replace IGBT tube.
Failure of feedback circuit.
Control board problem.
Replace control board.
8
During the cutting
process the
current is unstable
or not controlled by
the potentiometer.
Current regulating
potentiometer faulty.
Replace the potentiometer.
Bad contact at the connecting
wire of the current regulating
potentiometer or a loose
terminal of the connecting
wire.
Check the connecting wire
and fasten the terminal.