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Section E-1 Section E-1
V350-PRO
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
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
Remote
Board
Mode
Panel
Display
Panel
Control Board
Choke
Positive
Output
Te rminal
Negative
Output
Te rminal
To Control
Board
Current
Feedback
Reconnect
Switch
Output Voltage Sense
Input switch
Input
Rectifier
Auxiliary
Transformer
Fan
Power
Board
14 Pin
Amphenol
6 Pin
Amphenol
Remote Control & Trigger
RS232 Supply +5VDC
SPI Supply +15VDC +5VDC
Machine Control Supply
+15VDC, -15VDC, +5VDC
40VDC
28VAC
24VAC
115VAC, 42VAC
Main Switch Board
115VAC Fan Supply
Optional Solenoid
SPI Communications & +15VDC, +5VDC Supply
Fan Control
V/F Capacitor Feedback (2)
Soft Start Control
Input Relay Control
Primary Current Feedback
IGBT Drive Signal
Primary
Current
Sensor
Primary
Current
Sensor
Output
Potentiometer
Output
Control
Weld
Termi nals
Advanced
Process
Panel
RS232
12 VDC
(Not used if APP
is in place)
FIGURE E.1 – V350-PRO BLOCK LOGIC DIAGRAM
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