Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B - Manual (Page 49)

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TABLE OF CONTENTS
-THEORY OF OPERATION-
Theory of Operation ............................................................................................................. Section E
General Description ....................................................................................................................E-2
Input Voltage ...............................................................................................................................E-2
Precharge (Soft Start)..................................................................................................................E-3
Switch Boards.............................................................................................................................E-4
Main Transformer ........................................................................................................................E-5
Output Rectifier and Choke ........................................................................................................E-6
Control Board..............................................................................................................................E-7
Power Board ...............................................................................................................................E-8
Display Board..............................................................................................................................E-9
Thermal Protection....................................................................................................................E-10
Protective Circuits.....................................................................................................................E-10
Over Current Protection .....................................................................................................E-10
Over Voltage Protection......................................................................................................E-10
Field Effect Transistor (FET) Operation .....................................................................................E-11
Pulse Width Modulation............................................................................................................E-12
Minimum Output.................................................................................................................E-12
Maximum Output................................................................................................................E-12
Section E-1 Section E-1
POWER WAVE 450
FIGURE E.1 – POWER WAVE BLOCK LOGIC DIAGRAM
CONTROL
BOARD
DISPLAY
BOARD
PROTECTION
BOARD
AUX.
TRANS
POWER
BOARD
CT
CONTACTOR
INPUT
INPUT
RECTIFIER
AND
RECONNECT
SWITCH
BOARD
FET
ASSEMBLY
SWITCH
BOARD
FET
ASSEMBLY
MAIN
TRAMSFORMER
OUTPUT
RECTIFIER
SHUNT
CHOKE POSITIVE
NEGATIVE
SNUBBER AND
LEADS SENSE
LCD
DISPLAY
KEYPAD
OVERLAY
WATER
COOLER
PC
INTERFACE
INPUT
LINE
SWITCH
FAN
WF1 WF2
THREE
PHASE
INPUT
POWER
LEFT
RIGHT