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8. MAINTENANCE AND TROUBLESHOOTING
8.1 TROUBLESHOOTING GUIDE
Problem Possible Cause Required Action
– Plasma arc will not start. – Unit not powered up. – Check mains supply, on/off
switch is on.
– Work clamp connection. – Check ground clamp has a
good connection to the material
being cut, clean surface of
material if it is dirty or corroded.
– Air supply is low pressure. – Check air is flowing from the
torch tip with cut switch
pressed. Check the compressor
is maintaining 60psi at the
gauge while cutting is in
progress. Check the regulator
fittings have been assembled
properly using PTFE tape.
– Check the cutting tip is not
blocked by molten metal
splatter.
– Thermal cut-out light on front
panel of unit comes on.
– Switch machine off and wait
about 2-3 minutes, Switch
machine back on. This can
occur if the unit is overheating
due to a high ambient
temperature.
– Use 32A cable for power lead
extensions, a standard 13A type
is unsuitable if a long extension
is required. If the voltage at the
unit ‘dips’ below the minimum
value as the arc strikes the unit
will turn off and the OC light will
come on.
– Try operating the cutter at 20A
set current, if this is OK then
there is a problem with the
stability of the mains supply to
the unit. Use a different power
source or thicker mains cable to
connect to the unit mains lead.
– Torch Assembly / Air flow . – Check the torch has been
assembled correctly. Note the
presence and position of the
swirl ring.
– Wait for air flow to finish flowing
before operating cutting switch.
Plasma will not start if air is
already flowing from nozzle
when the cutting switch is
pressed.
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9
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