Maintenance and troubleshooting
6
The following operation requires su
ffi
cient professional
knowledge on electric aspects and comprehensive
safety knowledge. Make sure the input cable of the
machine is disconnected from the electricity supply and
wait for 5 minutes before removing the machine covers.
In order to guarantee that the arc welding machine works
e
ffi
ciently and in safety, it must be maintained regularly.
Operators should understand the maintenance methods and
means of arc welding machine operation. This guide should
enable customers to carry on simple examination and
safeguarding by oneself, try to reduce the fault rate and
repair times of the arc welding machine, so as to lengthen
service life of arc welding machine
Troubleshooting
Before arc cutting machines are dispatched from the factory,
they have already been checked thoroughly. The machine
should not be tampered with or altered.
Maintenance must be carried out carefully. If any wire
becomes loose or is misplaced, it maybe potential danger to
user!
Only professional maintenance personnel should repair the
machine!
Ensure the power is disconnected before working on the
machine. Always wait 5 minutes after power switch o
ff
before opening the case.
11
Period
Maintenance item
Daily
examination
Carry out a full visual inspection. Check
for any damage to the machine, leads,
cables and connections. Replace where
necessary.
Switch on the machine and check for any
warning Led’s and general operation
Monthly
examination
Using the dry compressed air to clean the
inside of arc welding machine. Especially
check for build up of dust / debris on
intake grills, main voltage transformer,
inductance, Mosfet modules, the fast
recover diode and PCB, etc. Take care
when blowing electronic components and
do not dislodge any wiring connections
Check the security of output connections
and plugs. Replace if signs of overheating.
Yearly
examination
Carry out an annual service. Check earth
continuity and insulation resistance of the
machine at the relevant points.
PLEASE NOTE THIS WORK SHOULD
BE CARRIED OUT BY A TRAINED
COMPETENT PERSON.
Malfunction
phenomena
Cause and solution
Turn on the machine, the
power LED is on, but the fan
does not work, and the
control button does not
function.
Over voltage protection occurs: Check if
the mains voltage is identical with the
working voltage of the machine.
Turn on the machine, the
power LED is on, and the fan
works. When pressing the
control button of the cutting
torch, the solenoid valve
functions, and the red LED
inside the machine is on or
the yellow LED on the front
panel is on.
Over current protection occurs:
1) The MOSFET on the top PCB is
damaged. (The drive module is
damaged.)
2) The control module is damaged.
Overheating protection occurs: It is
unnecessary to shut down the machine,
and it will recover after a few minutes.
Turn on the machine, the
power LED is on, and the fan
works. When pressing the
control button of the cutting
torch, the solenoid valve
functions, the red LED inside
the machine is off, but there
is no arc ignition.
The arc ignition part fails:
1) The air compressor inside the
machine is damaged or not well
connected.
2) Check the electrode and nozzle of
the cutting torch.
3) The arc maintaining relay is
damaged.
Turn on the machine, the
power LED is on, and the fan
works. When pressing the
control button of the cutting
torch,
1) The protective sleeve of the cutting
torch head is not well installed.
2) T h e c u t t i n g t o r c h t r i g g e r i s
damaged.
