Impax IM-TIG200 Instruction Manual page 27

MMA OPERATION & MAINTENANCE
Under these conditions and in original
packaging, electrode storage time is practically
unlimited. It should be noted that electrodes are
now available in hermetically sealed packs
which obviate the need for drying. However, if
necessary, any unused electrodes must be
redried according to manufacturer's instructions.
IMPORTANT – Thermostatic Protection
(Duty Cycle)
The MMA operation has a rated duty cycle of
20%. The percentage represents the welding
time in a 10 minute period for example 20%
means that the welding time is 2 minutes with a
rest time of 8 minutes in a ten minute period
although the actual duty cycle will depend on
the amperage used. If the Welding Power Supply
is used for longer than the duty cycle or if you
are welding using large welding rods you may
experience a temporary current shut off. This is
to protect the transformer inside the Welding
Power Supply from overheating.
The thicker the material being welded, the
greater the current required, therefore, the hotter
the machine will become and the quicker it will
cut out. When the windings reach performance
temperature the cut out switch will operate
illuminating the indicator lamp on the front panel
(Fig.13). After a few minutes the cut out switch
will reset and the welder will be ready for use.
Fig 13
WARNING. ELECTRIC SHOCK can kill.
Have an electrician install and service this
equipment.
Turn the input power off at the fuse box,
disconnect supply lines and allow machine to sit
for five minutes minimum to allow the power
capacitors to discharge before working inside
this equipment.
Do not touch electrically hot parts.
WARNING. Do not open this machine and do
not introduce anything into its openings. Power
supply must be disconnected from the machine
before each maintenance and service. After
each repair, perform proper tests to ensure
safety.
CAUTION. The power supply must be
disconnected from the machine before each
maintenance and service. Always use gloves in
compliance with the safety standards.
Routine Maintenance
The welder must be kept clean and dry at all
times. Use a dry cloth to clean the welder.
Keep the electrodes clean and dry and ensure
all cables are in good condition.
Keep the louvre passages clean to avoid a build
up of dirt and oxides inside the machine, which
can reduce machine output.
The nozzle will occasionally need to be cleaned
of spatter from welding. Clean it with a metal
brush. When the nozzle deteriorates or can no
longer be cleaned, it will need to be replaced.
Unscrew the nozzle and replace it with a new
one.
Always try to avoid getting particles of metal
inside the machine since they could cause short
circuits.
Periodically clean the inside of the welder with
compressed air, ensuring you wear a mask
during the operation.
Caution: Water must never come into contact
with the welder.
Regularly check the general condition of the
tool. Check for loose screws, misalignment or
binding of moving parts, cracked or broken
parts, damaged electrical wiring, and any other
condition that may affect its safe operation.
If the supply cord requires replacing, the task
must be carried out by the manufacturer, the
manufacturer's agent, or an authorised service
centre to avoid a safety hazard.
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