LGK-40/63IGBT OPERATOR’S MANUAL
17
power switch of distribution box is damaged, and if the fuse and the machine power wire are
well equipped. Otherwise it will cause phase missing or bad contact, which makes the
machine work abnormally
；
3) Check if the torch switch and its wire are damaged or short-circuit, and if the nozzle and
electrode are damaged
；
4) Check if the cutting ground wire is well connected
；
5) Check if the water in compressed air filter fixed at the back of machine is drained regularly
；
6) Check if the gas pressure indicator lamp on the panel is ON. If it is not ON, check if
compressed gas pipe is well connected , and if the gas pressure is normal. When the gas
pressure is less than 0.3Mpa, the lamp is not ON.
7) Open the machine top cover to check if the lead-typed fuse next to the control transformer
has been fused
；
Ordinary trouble and repair as following diagram
Trouble
Reasons
Solutions
1. When the power
is switched on, the
lamp and the digital
meter are not ON.
1.Three-phase power misses phase
2.Supply power is damaged
3.Power control fuse 1.5A is broken
1.Check three-phase power source
2.Change power switch
3.Change power control fuse
2
．
Supply abnormity
indicator lamp is ON
without arc striking
1
．
Three-phase power misses phase
2. Three-phase power over voltage
or under voltage
Check three-phase power source to
ensure the supply voltage accordance
with the supply requirements.
3. No arc striking or
arc breaking during
cutting.
Overheat
indicator
lamp
is
ON.
1
．
The ambient temperature is too
high.
2
．
When cutting, cooling fan
rotates slowly or do not rotate, so
the cooling effect is bad.
3
．
Temperature relay is damaged
1
．
Let the cutter rest for a while, and
will come to work normally later.
2
．
Check fan power source or change
cooling fan
3
．
Change temperature relay
4
．
It cannot start.
Gas pressure lamp is
not ON.
1
．
No gas pressure
2
．
The pressure of gas supply is too
low
1
．
Connect the gas source
2. Adjust gas supply pressure.
5.
Without
arc
striking,
cutting
indicator lamp, gas
pressure lamp are
ON,
and
supply
abnormity indicator
lamp and overheat
lamp are not ON.
1
．
Cutting ground wire is not well
connected.
2
．
Gas pressure is too high.
3
．
Torch electrode and nozzle are
badly broken.
4
．
Torch is damaged.
1
．
Connect the cutting ground wire well
2
．
Lower the pressure of gas supply
3
．
Change the electrode and nozzle
4
．
Change the torch
6
．
Weak cutting
quality
1
．
Gas pressure is too high or too
low.
2
．
Workpiece is too thick
3
．
Torch electrode and nozzle are
broken
4
．
Plasma arc is not perpendicular
to the workpiece
5
．
Cutting speed is too fast or too
slow
1
．
Adjust gas pressure
2
．
The thickness of workpiece should be
within the quality cutting range.
3
．
Change electrode and nozzle
4
．
Adjust torch angle
5
．
Adjust cutting speed
If the troubles cannot be resolved, please inform our local agent of the specific problems or
contact us directly.
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Summary of Contents for LGK-40/63IGBT
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