WIA WELDMATIC 270C, Руководство оператора

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10
Operators Manual
Quality
•
Reliability
•
Performance
Output Voltage Polarity
The design of the Weldmatic 270C allows
selection of the output voltage polarity.
Positive Wire
G.M.A.W. with solid consumable wires 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 socket
on the Power Source, and the ‘WELDING’
lead from the wirefeeder into the (+) socket
on the Power Source, as in Figure 3.
Fig 3 Positive Wire
To wirefeeder
To work clamp
Negative Wire
Some ‘self-shielded’ flux cored 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 socket
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 – can result in
higher weld currents
• Repeated starts – can result in high in-
rush currents raising the 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.
The current rating of the supply cable
depends on cable size and method of
installation. Refer to AS/NZS 3008.1, Table 9.
Supply Cord Replacement
If it becomes necessary to replace the mains
power supply flexible cable, use only cable
with the correct current rating. Access to the
supply terminals is gained by removing the
power source side panels.
The replacement cable must be fitted and
retained in the same manner as the original.