AR-300 DC arc welding machine circuit

AR-300 DC arc welding machine circuit

Rotary DC arc welding machines include AX, AX1, AX3 and AR series. Its structure is basically the same, and it is
an integral converter unit composed of a three -phase asynchronous motor and a DC arc welding generator coaxially.
    The current adjustment of AX series DC arc welding machine has two types: coarse adjustment and fine adjustment. The coarse adjustment has three positions and is fixed in the groove of the machine cover
. It is realized by moving the brush holder. If the brush holder is moved in the direction of the motor, the working current will decrease; on the contrary, the working current
will increase. Fine adjustment is achieved by changing the resistance of the varistor in the shunt winding via a handwheel.
    The current adjustment of AX1 series DC arc welding machine has two types: coarse adjustment and fine adjustment. Coarse adjustment is
achieved by changing the number of turns of the series winding on the line board . Fine adjustment is achieved by changing the resistance of the transformer in the shunt winding via a handwheel. The current adjustment of
    AX3 series DC arc welding machine has two types: coarse adjustment and fine adjustment. There are two levels of coarse adjustment,
realized by a single-throw switch with large and small marks . Fine adjustment is achieved by moving the brushes with a hand wheel. The change of polarity can
be achieved by pulling the double-throw switch with "reverse" and "forward" marks .