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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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RANGE
SWITCH
REACTOR
STATOR
ROTOR
MECHANICAL
ROTATION
ENGINE
GLOW PLUGS
BATTERY
6 PIN
AMPHENOL
14 PIN
AMPHENOL
OUTPUT
CONTROL
REMOTE
SWITCH
BY-PASS
BOARD
SHUTDOWN
SOLENOID
STARTER
MOTOR
ALTERNATOR
IDLER
SOLENOID
PRINTED
CIRCUIT
BOARD
FIELD
CAPACITOR
FIELD
BRIDGE
115 & 230VAC
RECEPTACLES
AC
AC
OUTPUT
RECTIFIER
BRIDGE
CAPACITORS
PART OF
RANGE
SWITCH
CHOKE
POLARITY
SWITCH
WORK
TERMINAL
ELECTRODE
TERMINAL
CONTACTOR CLOSURE
ROTOR
SLIP
RINGS
42VAC
115VAC
cv
output
contactor
CONTACTOR CLOSURE
OIL &
WATER
SENSORS
RANGER 300 DLX
FIGURE E.5 – OUTPUT BRIDGE, CHOKE, POLARITY SWITCH, OUTPUT CONTACTOR
AND OUTPUT TERMINALS
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.