General Description - Migatronic Automig X Instruction Manual

GENERAL DESCRIPTION

MIGATRONIC welding machines, type Automig: 140 Mono X, 140 X, 180 Mono X, 180 X, 185 X, 200 X, 250 X
and 300 X have been developed for thin plate welding and car body repair.
The Automig 140 Mono X and 180 Mono X are designed to normal single-phase 220-240 V plug
(F+0+earth)/10 Amp(16Amp) where as the Automig 140 X, 180 X, 185 X, 200 X, 250 X, 300 X are designed for
three-phase 220-380 V (3F+earth)/10Amp.
Automig 185 X needs only two phase wires (2F+earth)/16Amp.
The main parts of the machine are the main transformer, the contactor, the rectifier for welding current, the
condenser battery (only 140 M X, 180 M X, 185 X), the control transformer, the wire feed motor, the solenoid
valve and the electronic control.
The welding transformer has been dimensioned to obtain optimum welding capacities, and for a working
temperature of 180°C. For further protection a thermal fuse has been incorporated which automatically cuts out
the machine at 150°C. The overheating protection will switch on automatically when the transformer has cooled.
The rectifier is electronically protected against overloading in case of short circuit of the welding current, the
machine will cut out after approx. 3 sec.
Mode of operation: When the trigger at the welding handle is activated the contactor will couple voltage to the
welding transformer which will give a secundary voltage decided by the position of the voltage switch. In the
rectifier this AC voltage is transformed into a DC voltage which is applied between welding torch and return
cable. At the same time the flow of protection gas and the wire feed motor are started. The number of revolutions
is decided by the adjustment button. When you lift your finger from the trigger the motor will stop and after a
short delay the contactor and the welding current are interrupted.
This delay which is called "burn back delay" has the effect that the welding wire will burn back a little from the
molten pool and thus does not stick to the pool. The time of delay can be set by the lowest trimpotentiometer at
the print card.
The electronic control can be set to the functions "seam" , "spot" , and "interval" .
At "seam" the welding will start when you press the trigger and stop when you release the trigger.
At "spot" the welding will stop after a delay that can be set by the button "welding time". Using this function you
are sure of a uniform interval welding.
In the position "interval" the wire feed motor will stop with intervals that can be set by the buttons "welding time"
and "pause time". When you put "pauses" into the welding, the average heat volume added is reduced to
prevent a burning through on difficult welding tasks.
4