Theory of operation, Generating power (continued), E-6 outback® 185 – Lincoln Electric OUTBACK SVM204-A User Manual

Page 40

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THEORY OF OPERATION

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