Weldmatic 350i + Weldmatic 500i
Model No CP139, CP140
11
The minimum recommended supply circuit
breaker rating for a Weldmatic 500i is 32
Amps.
Successful operation
Successful operation will depend on a
number of factors:
• Variation in circuit breaker thresholds.
• Ambient temperature.
• Number of previous circuit breaker
operations.
• Actual weld conditions, resulting in
higher weld currents.
• Repeated starts can result in repeated
in-rush currents raising circuit breaker
threshold.
Repeated circuit breaker operation at weld
start can sometimes be overcome by using a
“D” curve circuit breaker.
To reduce nuisance tripping, a higher
rated circuit breaker can be selected, but
the supply circuit wiring capacity must be
increased to suit.
Supply Cable
If it becomes necessary to replace the mains
flexible supply cable, use only cable with
correct current rating.
The replacement cable must be fitted and
retained in the same manner as the original.
Output Voltage Polarity
The design of the Weldmatic allows selection
of the output voltage polarity.
Positive Wire
MIG welding (GMAW), with solid
consumable wires and gas shielding, is
carried out with the work piece Negative and
the welding wire Positive.
To setup for this condition, connect the
‘WORK’ lead plug into the (-) output terminal
on the power source, and the wirefeeder
weld cable into the (+) output terminal.
Negative Wire
Some ‘self-shielded’ flux cored gasless
consumable wires are operated with the
work piece Positive and the consumable wire
Negative. Refer to the manufacturers data for
the particular consumable wire to be used.
To setup for this condition, connect the
‘WORK’ lead plug into the (+) output
terminal on the power source, and the
wirefeeder weld cable into the (-) output
terminal.
Fitting the Gas Cylinder
Place the gas cylinder on the tray at the
rear of the optional welder trolley (if using).
Retain the cylinder with the chain provided.
Fit the gas regulator to the cylinder. DO NOT
apply grease or oil to these joints.
Fit the end of the gas inlet hose from the
back of the power source to the connector
supplied with the gas regulator, and secure
with the clamp also supplied.
