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 welding 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.
14
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, IGBT module, 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 symptom
Causes and Solutions
Turn on the machine, the power LED
is off, the fan doesn't work, and no
welding output.
1 Check if the power switch is closed.
2 No input power.
Turn on the machine, the fan works,
but the output current is unstable
and can't be controlled by
potentiometer when welding.
1 The current potentiometer fails. Replace
it.
2 Check if any loose contact exists inside
the machine. If any, reconnect.
Turn on the machine,, the fan works,
but no welding output.
1 Check if any loose contact exists inside
the machine.
2 Open circuit or loose contact occurs at the
joint of output terminal.
3 The overheating LED is on.
The machine is under over-heating
p r o t e c t i o n s t a t u s . I t c a n r e c o v e r
automatically after the welding machine is
cooled.
4 Check if the thermal switch is ok. Replace
it if damaged.
5 Check if the thermal switch is loosely
connected, and reconnect it if necessary.
The electrode holder becomes very
hot.
The rated current of the electrode holder is
smaller than its actual working current.
Replace it with a higher rated current
capacity.
Excessive spatter in MMA welding.
The output polarity connection is incorrect.
Exchange the polarity.
