OUTPUT BRIDGE, CHOKE,
POLARITY SWITCH, OUTPUT
CONTACTOR AND OUTPUT
TERMINALS
The AC voltage developed in the stator weld winding
is delivered, through the reactor and range switch, to
the output bridge and polarity switch. Depending
upon the setting of the polarity switch, either AC volt-
age or DC voltage is delivered to the output terminals.
If AC output is selected, the current path is from the
stator weld winding through the reactor, range switch,
and polarity switch; through the output contactor to
the output terminals. If a DC output is called for, the
current path is through the output rectifier bridge,
where the AC voltage is rectified to a DC voltage; and
then to the choke, where the DC output is filtered. The
filtered DC current path is through the polarity switch
and output contactor to the output terminals.
When a CV (constant voltage) is desired, the reactor is
passed by. The range switch applies a lower AC volt-
age to the rectifier bridge. The DC output of the bridge
is filtered and “stiffened” by the capacitors. This lower
but “stiffer” DC output is passed through the tapped
portion of the choke, the polarity switch, and output
contactor to the output terminals.
In the Ranger 300DLX machines, the output contactor
is in series with the electrode terminal and must be
energized (closed) to provide welding voltage at the
output terminals.
THEORY OF OPERATION
E-5 E-5
RANGER 300 D AND 300 DLX
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