7.2
Operation
The power source is not powered instantly when the mains switch (1) is turned on.
After approximately 2 seconds the green lamp (2) indicates that the power source is
ready.
If the welding gun trigger is pressed while the power source is being turned on, the
operation is disabled, until the trigger is released. This is also indicated by the
orange lamp (3).
The main knob (6) is scaled in mm and ga. The numbers point out recommended
thicknesses of the mild steel workpiece to be welded with .030" wire. This knob
simultaneously adjusts both the wire feed speed and the average output voltage.
The knob (7) sets the arc length correction or i.e. the voltage correction.
The return cable (5) must be reliably connected to the workpiece or to the welding
table.
The side panel covering the wire feeder must be closed prior to welding.
The power source is instantly switched with the mains switch (1).
7.3
Polarity change
The power source is delivered with the welding wire connected to the plus pole.
Some wires, e.g. shelfshielded cored wires, are recommended to be welded with
negative polarity. Negative polarity means that the wire is connected to the minus
pole and the return cable to the plus pole. Check the recommended polarity for the
welding wire you want to use.
bc21a
- 16 -
+/- TERMINALS