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© MOSA
1.1-10/04
The Engine Driven Welder is a block with an engine, an aluminium casting and a front panel. Inside the
c asting there are all electrical components of the machine: a permanent magnet alternator, a high
frequency chopper diode bridge, an electronic control board and an electromagnet.
Main features:
• D.C. welding current 150A @ 60%
• Continuous regulation of the welding current with "Chopper Technology"
• Suitable for basic and rutile electrodes. A reactance for cellulose electrodes is available as an option
• Antistick function (small arc force)
• Continuous auxiliary output 1600 W/ 230 Vdc (max. power 2000 W)
• Auto idle function
• Weight 34 Kg.
Electrical components of the machine:
• Permanent magnet alternator: the alternator has 2 galvanically separated windings, one for welding
and the other for the auxiliary output.
• Auto idle solenoid: an electromagnet inside the aluminium casting is supplied at no load only and
forces the engine speed at minimum (2000 rpm). When the load is present, welding or auxiliary
output, the electromagnet is not supplied any more and the engine speed goes to the maximum
(4000 rpm rated open circuit).
• High frequency chopper diode bridge: it regulates the welding current using the "Chopper Technology",
which chops the welding D.C. current at high frequency.
• Hall sensor: it measures with high precision the welding current and it's completely isolated from the
welding circuit.
• Reactance for cellulose electrodes (optional).
• PWM control board: this single board controls the welding process, the auxiliary current and the
electromagnet for the engine accelerator. Three integrated circuits PWM type (Pulse Width Modulation)
have been used. The use of these PWM's not only for the welding control but also for the supply
control of the electromagnet reduces to the minimum the wasted power on the electromagnet.
• D.C. chopped auxiliary output: the auxiliary output is chopped every 50 msec. in order to prevent
damages to switches of hand tools due to arcing. This special D.C. auxiliary is suitable not only for
universal hand tools with brushes, but also for those with electronic speed control. In this case the
limit is that these tools can run at the maximum speed only, without possibility of speed regulation.
DESCRIPTION OF THE MACHINE
Regulation knob for
welding current
Auxiliary output
MAGIC WELD
Fuse for auxiliary output
M
0
Welding sockets
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