WF-255MST
© Weldclass 2019 | E.&O.E. | Edition 2.2 23
5.1 Electrical Connection
The WF-255MST is designed to operate on a 25A 240V AC power supply to facilitate full output of the
machine as per Table 3.
However, the WF-255MST is factory-fitted with a 15A 240V plug and 3x2.5mm
2
input cable for
commissioning purposes. Whilst this 15A plug is fitted the operator must ensure that the operation of
the machine does not exceed the output and duty cycle limits as per Table 2.
If full output is required, WF-255MST should be fitted with 3x4.0mm
2
input cable and 25A or 32A 240V
plug.
Follow the procedure below for Setting machine to 15A Input Mode or Full Output Mode.
WARNING! This machine must be electrically connected by a qualified electrical
trades-person. Personal injury or death or damage to the machine may result from
incorrectly connected power supply or plug.
5.1.1 Setting machine to 15A Input Mode
1. Turn Mains Power Switch (23) Off for at least 10 seconds
2. Press and hold both Left Selection Knob (31) and Right Selection Knob (32) whilst you switch the
Mains Power Switch (23) back On.
3. Machine will now be in 15A Mode - Output will be restricted to 200 Amps as per Table 2.
5.1.2 Setting machine back to Full Output Mode
1. Whilst machine is turned on, press and hold Left Selection Knob (31) for 5 seconds
2. Machine will now be in Full Output Mode which will enable you to select full output welding
current up to 250 Amps, as per Table 3.
To determine which mode the machine is currently in, check the maximum current/Amps setting that the
machine will allow. Max 200A = 15A input mode. Max 250A = Full Output Mode.
5.2 Extension Leads
If using on 15A power supply, a 2.5mm
2
heavy duty extension cord may be used, providing the output
and duty cycle limits as per Table 2 are not exceeded.
If using 25A power supply, extension lead should be minimum cable core size 4.0mm
2
.
Using extension leads of over 100m is not recommended.
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