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!
1) Check if the switches on the front panel are in correct
position.
2) Check if the 3-phase power is 340~420V, and if phase
failure occurs.
3) Check if the input cable of the machine is correctly and
well connected.
4) Check if the machine is correctly and reliably earthed.
5) Check if the welding cable is correctly and well
connected.
6) Check if the gas path and gas regulator is in good
condition.
Note: The voltage inside the machine can reach up to 600V,
so do not uncover the machine due to safety hazard. Ensure
the power is disconnected before working on the machine.
Always wait 5 minutes after power switch o
ff
before opening
the case.
Take necessary protection during troubleshooting and
maintenance work to avoid electric shock. Cut o
ff
the power
before the installation of welding cable and replacement of
torch parts.
12
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.
Summary of Contents for JM-350C
Page 16: ...Electrical schematic 7 15 VDC ...
