Lincoln Electric COMMANDER 400 SVM133-B Service Manual page 49

Section E-1
-THEORY OF OPERATION SECTION-
Theory of Operation .............................................................................................................Section E
General Description ...............................................................................................................E-2
Battery, Starter, Engine, Rotor and Stator .............................................................................E-2
Exciter Feedback, Control Board, Local and Remote Control ..............................................E-3
Weld Winding, Output Bridge, Output Choke and CV Capacitors ........................................E-4
SCR Operation ......................................................................................................................E-5
Induction Generators .............................................................................................................E-6
STARTER
ALTERNATOR
ENGINE
SHUTDOWN
SOLENOID
IDLER
SOLENOID
BATTERY
ENGINE
SENSORS
TABLE OF CONTENTS
MECHANICAL
ROTOR
ROTATION
EXCITER
WINDINGS
115VAC
EXCITER
14 PIN
CAPACITORS
AMPHENOL
115/230VAC
BY-PASS
RECEPTACLE
6 PIN BOARD
AMPHENOL
EXCITER VOLTAGE
FEEDBACK
BOARD
FIGURE E.1 – COMMANDER 400 BLOCK LOGIC DIAGRAM
COMMANDER 400
SCR/DIODE
OUTPUT
OUTPUT
CHOKE
BRIDGE
SCR GATE SIGNALS
42VAC
REMOTE
SWITCH
PC
FINE
OUTPUT
CONTROL
12VDC
Section E-1
NEGATIVE
TERMINAL
CV
TERMINAL
SHUNT
POSITIVE
TERMINAL
F
E
FEEDBACK
E
D
B
A
C
K
CV
BOARD
METER
MAIN
CONTROL
BOARD
ENGINE
PROTECTION
BOARD
CURRENT/ MODE
SELECTOR
SWITCH