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THEORY OF OPERATION
E-6 E-6
OUTBACK® 185
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.
FIGURE E.6 - GENERATING POWER
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.
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
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+
CB1
CB3
CB2
CB4
__
++
_
+
240 VAC
RECEPTACLE
ENGINE
OIL
LEVEL
MODULE
(KOHLER)
OIL LEVEL
INDICATOR
OIL LEVEL
SWITCH
IGNITION
STATOR
ROTOR
OFF
AUTO
HIGH
START
ALTERNATOR
IDLE
SOLENOID
SLIP
RINGS
AUXIIARY WINDINGS
WELD
WINDINGS
REACTOR
EXCITER
WINDING
CURRENT
SENSOR
120 VAC RECEPTACLES
BOOST
WINDING
OUTPUT
RECTIFIER
(2 PHASE)
CHOKE
OUTPUT
STUDS
BATTERY
ENGINE
SHUTDOWN
RELAY
HOUR
METER
FIELD / CONTROL PC BOARD
AUTOMATIC
IDLER
CIRCUIT
OUTPUT
CONTROL CIRCUIT
OUTPUT
CONTROL
10 AMP
FUSE
STARTER /
SOLENOID
BRUSHES