Lincoln Electric OUTBACK SVM204-A Service Manual page 40

E-6
OIL LEVEL
OIL INDICATOR
LEVEL
MODULE
(KOHLER)
OIL LEVEL
SWITCH
IGNITION
/
STARTER
SOLENOID
10 AMP
FUSE
OFF
AUTO
HIGH
_ _
+ +
START
BATTERY
GENERATING POWER
(continued)
DC Weld Output
AC output from the two phase-shifted weld windings
pass through a reactor then to a two-phase bridge rec-
tifier. DC output from the rectifier is then stabilized by
a choke and terminates at two weld output terminals.
Weld Output Control
Weld output is controlled by varying the current in the
rotating field winding. This is done through circuitry on
the PC board that detects the position of the output
control potentiometer and then limits the rotor current
accordingly.
NOTE: Because the strength of the rotating field
affects the output of all the windings, auxiliary output
will also drop when the weld output control setting is
decreased.
THEORY OF OPERATION
FIGURE E.6 - GENERATING POWER
AUXIIARY WINDINGS
SLIP
_ +
RINGS
ENGINE ROTOR
BRUSHES
EXCITER
IDLE
ALTERNATOR WINDING
SOLENOID
ENGINE
SHUTDOWN
RELAY
HOUR
METER
FIELD / CONTROL PC BOARD
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
OUTBACK® 185
CURRENT
120 VAC RECEPTACLES
SENSOR
REACTOR
STATOR
WELD
WINDINGS
BOOST
WINDING
AUTOMATIC OUTPUT
IDLER CONTROL CIRCUIT
CIRCUIT
Weld Boost:
The Outback® 185 is equipped with a weld boost cir-
cuit that improves weld performance. The reactor con-
tains a weld boost winding that produces output rela-
tive to the weld current. In high welding load situations,
the exciter winding will tend to drop off in output while
the boost winding's output tends to increase. The out-
put from this boost winding is routed through a circuit
breaker. It is then rectified and added to the exciter cir-
cuit, resulting in a significant improvement in weld per-
formance.
240 VAC
RECEPTACLE
CB1 CB3
CB4
CB2
+
CHOKE
OUTPUT
OUTPUT
RECTIFIER
STUDS
(2 PHASE)
OUTPUT
CONTROL
E-6