Weldclass WeldForce WF-140ST, Operating Instructions Manual

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WF-140
ST
/ WF-180
ST
© Weldclass | E.&O.E. | Edition 1.1 | 2019.05.03 11
4.2.1 Amps
This is the output welding amperage.
4.2.2 Hot Start Adjustment (Stick)
Hot Start setting is adjustable from 0 – 10. Hot start provides extra power when the weld starts to
counteract the high resistance of the electrode and workpiece as the arc is started. It makes igniting the
electrode easier and prevents it from sticking when cold. 0 is Hot-Start off, 10 is maximum Arc Force
(around 20-30A higher than the set welding current/amps).
4.2.3 Arc Force Adjustment (Stick)
Arc Force setting is adjustable from 0 – 10. (Sometimes called ‘Dig’ or ‘Arc Control’). A Stick welder is
designed to produce constant output current (CC). This means with different types of electrode and arc
length; the welding voltage varies to keep the current constant. This can cause instability in some
welding conditions as Stick welding electrodes will have a minimum voltage they can operate with and
still have a stable arc.
Arc Force control boosts the welding power if its senses the welding voltage is getting too low. The
higher the arc force adjustment, the higher the minimum voltage that the power source will allow. This
effect will also cause the welding current to increase. 0 is Arc Force off, 10 is maximum Arc Force (around
20-30A higher than the set welding current/amps). This is practically useful for electrode types that have
a higher operating voltage requirement or joint types that require a short arc length such as out of
position welds.
4.3 Error/Over Temperature Indicator Light
Error/Over Temperature Indicator Light (16) illuminates when duty cycle is exceeded and thermal
protection is activated. When thermal protection is activated, welding output will be disabled until
machines cools sufficiently and overload indicator lamp goes out.
This may also activate if there are electronic circuit failure issues.
4.4 Optional VRD Function
This function is disabled by default. To have this feature enabled please contact your WeldForce
distributor.
When enabled VRD function reduces the welding machines’ open circuit voltage (OCV, or no-load
voltage) to a much safer level of U
0
<24V. OCV is the voltage measured across the positive and
negative terminals when welding is not in progress.
The VRD function will turn on full welding power/voltage when the resistance between the electrode
and work piece is less than 200 Ohms (i.e. metal to metal contact).
When the VRD function is active, the VRD Active Indicator Light (9) is illuminated.
Figure 7
Figure 6