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TM-499 Page 22
1 Engine
Supplies force to turn revolving
fields.
2 Revolving Field (Rotor)
Turns at 3700 rpm maximum (60
Hz) for weld and power. The speed
and excitation current of the field
coils determine voltages in stator
windings.
3 Stator Windings
Supply power to exciter, generator
power, and weld circuits.
4 Integrated Rectifier SR1
Changes ac output of stator
windings to dc to supply excitation
current to the exciter revolving field.
5 Control Board PC1
Adjusts weld output by changing
revolving field current after
comparing feedback to amperage
setting of R1.
Uses current feedback signal for
foldback circuit to prevent stator
failure from short-circuit conditions.
Use voltage feedback signal to
maintain open-circuit and genera-
tor power voltages regardless of
Current Control R1 setting.
Monitors engine speed and stops
weld and power output when speed
drops below 2700 rpm.
6 Current Control R1
Changes output of stator weld
windings by adjusting field current
level in revolving field.
7 Generator Power Circuit
Breakers
Protect ac receptacles from over-
load.
8 Generator Power AC
Receptacles
Provide connection points and
power for auxiliary equipment.
SECTION 8 − THEORY OF OPERATION
Integrated
Rectifier
SR1
Revolving
Field
(Rotor)
Engine
Exciter
Stator Windings
Weld
6
4
213
Control
Board
PC1
Circuit
Breakers
Generator
7
8
Generator Power
5
Power AC
Receptacles
Current
Control R1
AC Supply
Engine Speed Feedback Signal
Excitation DC Supply
Generator Power