Lincoln Electric INVERTEC SVM158-A Service Manual page 43

Section E-1
-THEORY OF OPERATION SECTION-
Theory of Operation .............................................................................................................Section E
General Description ....................................................................................................................E-2
Input Line Voltage, Auxiliary Transformer and Precharge...........................................................E-2
Switch Board and Main Transformer ..........................................................................................E-3
Power board, Control Board, and SPI Communications............................................................E-4
Output Rectifier and Choke ........................................................................................................E-5
Thermal Protection .....................................................................................................................E-6
Protection Circuits ......................................................................................................................E-6
Over current Protection ........................................................................................................E-6
Under/Over Voltage Protection ............................................................................................E-6
Insulated Gate Bipolar Transistor (IGBT) Operation ...................................................................E-7
Pulse Width Modulation..............................................................................................................E-8
Minimum/Maximum Output..................................................................................................E-8
Input
Input switch
Rectifier
Auxiliary
Transformer
115VAC, 42VAC
24VAC
28VAC 40VDC
14 Pin
Amphenol
6 Pin
Amphenol
TABLE OF CONTENTS
FIGURE E.1 – V350-PRO BLOCK LOGIC DIAGRAM
Main Switch Board
Reconnect
Switch
Fan
115VAC Fan Supply
Input Relay Control
Soft Start Control
V/F Capacitor Feedback (2)
Machine Control Supply
+15VDC, -15VDC, +5VDC
Power
SPI Supply +15VDC +5VDC
Board
RS232 Supply +5VDC
Remote Control & Trigger
Remote
Output Weld
Control Terminals
Output
Potentiometer
V350-PRO
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback
Control Board
SPI Communications & +15VDC, +5VDC Supply
Mode
Display
Panel
Board Panel
(Not used if APP
is in place)
Optional Solenoid
Section E-1
To Control
Board
Positive
Output
Terminal
Choke
Negative
Output
Terminal
RS232
Advanced
Process
Panel