Theory Of Operation Section Table Of Cotents; V-350-Pro Block Logic Diagram - Lincoln Electric INVERTEC V350-PRO Service Manual

Section E-1
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
14 Pin
Amphenol
6 Pin
Amphenol
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
FIGURE E.1 – V350-PRO BLOCK LOGIC DIAGRAM
Main Switch Board
Reconnect
Switch
Fan
115VAC Fan Supply
V/F Capacitor Feedback (2)
Machine Control Supply
+15VDC, -15VDC, +5VDC
Power
SPI Supply +15VDC +5VDC
Board
40VDC
RS232 Supply +5VDC
Remote Control & Trigger
Output
Control
Output
Potentiometer
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback
Input Relay Control
Soft Start Control
Control Board
SPI Communications
Mode
Remote
Panel
Board
(Not used if APP
is in place)
Weld
Optional Solenoid
Terminals
V350-PRO
Section E-1
To Control
Board
Choke
RS232
& +15VDC, +5VDC Supply
Advanced
Display
Process
Panel
Panel
Positive
Output
Terminal
Negative
Output
Terminal