Weldmatic 270 | Operator Manual | Model No CP146-2
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5 INSTALLATION
Connection to Electrical Mains
Power Supply
The Weldmatic 270 is factory fitted with a
3 metre, 3 core 2.5 mm2 Heavy Duty PVC
mains power supply cable with moulded
3 pin, 15 Amp, Single Phase plug.
15 Amp Supply Limited Output
To operate the machine with the 15 Amp
plug from a 15 Amp mains supply, the output
of the machine needs to be limited, so as
not to exceed primary current Ieff 15 Amp.
A Weld voltage selection of D-1, and
operation at 22% duty cycle (i.e. 2 min 12
sec on, 7 min 48 sec off) will maintain an
effective input current Ieff of 15 Amp.
The output will be limited to 200 Amp
(based on conventional load). The
maximum input limited to 32 Amp.
A 15 Amp socket outlet installation, typically
supplied with a 20 Amp “C” curve circuit
breaker, will be able to safely supply this.
Maximum Rated Output
To achieve the rated output of 270 Amp,
20% duty the machine requires maximum
primary current Imax 56 Amp and effective
primary current Ieff 25.3 Amp.
The machine needs to be fitted with a plug
of 25 Amp capacity or greater, and a supply
circuit capacity of 25 Amp or greater.
The minimum recommended supply circuit
breaker rating for a Weldmatic 270 is
25 Amps. For Australian and New Zealand
installation a 32 Amp plug is the closest
suitable size. The supply circuit will also
need to be rated at 32 Amp.
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
inrush currents raising the circuit
breakerthreshold.
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.
NOTE. All electrical work shall
only be undertaken by a qualified
electrician.
