Theory Of Operation - Lincoln Electric RANGER SVM148-B Service Manual

E-4
RANGER 300 DLX
SHUTDOWN
SOLENOID
BY-PASS
BOARD
CONTACTOR CLOSURE
OUTPUT
CONTROL
42VAC
115VAC
6 PIN
14 PIN
AMPHENOL
AMPHENOL
WELD WINDING, REACTOR AND
RANGE SWITCH
The stator weld winding is connected to the reactor
and range switch. The inductance in the reactor offers
an impedance to current flow.
tapped at various points. As the range switch is rotat-
ed, different amounts of reactor coil are brought into
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

THEORY OF OPERATION

FIGURE E-4
WELD WINDING, REACTOR AND RANGE SWITCH
REACTOR
GLOW PLUGS
ENGINE
MECHANICAL
ROTATION
STARTER
MOTOR
OIL &
WATER
SENSORS
IDLER
SOLENOID
ALTERNATOR
BATTERY
REMOTE
SWITCH
The reactor coil is
RANGER 300 D AND 300 DLX
RANGE
SWITCH
AC
PART OF
RANGE
OUTPUT
SWITCH
RECTIFIER
BRIDGE
AC CAPACITORS
STATOR
ROTOR
ROTOR
SLIP
RINGS
115 & 230VAC
FIELD
RECEPTACLES
BRIDGE
PRINTED
CIRCUIT
BOARD
FIELD
CAPACITOR
the current path. As more turns of reactor are brought
into the circuit, the more impedance there is to current
flow. Simply stated, the more reactor in the circuit, the
lower the welding current.
If a constant voltage is desired for wire feeding, then
the reactor is bypassed, and the range switch is con-
nected to one of four taps on the stator weld winding
to provide a lower but "stiffer" output voltage.
WORK
TERMINAL
CHOKE
ELECTRODE
cv
TERMINAL
output
contactor
CONTACTOR CLOSURE
E-4