FastMig M 420MV
8
EN
3. OPERATION CONTROLS
3.1 Main switch I/O
When you turn the switch into I-position, pilot lamp H11 on the front face is illuminated and
the machine is ready for use.
NOTE! Always turn the machine on and o with the mains switch, never use the mains plugs as a
switch.
3.2 Pilot lamps
The pilot lamps of the machine report the electric operation:
The green pilot lamp H11 when lit indicates that the machine is on and ready for use and it is
connected to the mains supply with the main switch in the I-position.
H12 indicates when lit that the thermal protection of the machine has been activated due to
over heating. The cooling fan will continue to run and cool the machine down and when the
lamp is o the machine is ready to weld.
3.3 Operation of cooling fan
In FastMig power sources there are two simultaneously operating fans.
• The fan is started for a moment when main switch is placed into position I.
• The fan will start during welding as the machine heats up and it will run for 1 to 10
minutes after the welding has stopped.
4. MANUAL METAL ARC WELDING
The FastMig power source can be used in electrode welding by connecting a FastMig
MXF 63, MXF 65 or MXF 67 wire feeder to it. The power source can be made suitable for
electrode welding without a wire feeder by connecting an R10 or R20 remote control to the
X14 or X15 terminal at the back of the power source for welding current adjustment, and the
welding power cable connected to the power source’s (+) connector X11 or X12.
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