Lincoln Electric POWER WAVE 355/405 SVM159-A - Manual (Page 35)

Section E-1 Section E-1
POWER WAVE 355/405
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
DC Bus Board, Power board and Control Board .......................................................................E-4
Output Rectifier and Choke ........................................................................................................E-5
Thermal Protection .....................................................................................................................E-6
Protective 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-
Control Board
Choke
Positive
Output
Terminal
Negative
Output
Terminal
To Control
Board
Current Feedback
Reconnect
Switch
Output V
oltage Sense
Input switch
Input
Rectifier
Auxiliary
Transformer
Fan
Power
Board
220
Receptacle
RS232 Supply +5VDC
Machine Control Supply
+15VDC, -15VDC, +5VDC
40VDC
42VAC
220 VAC
Main Switch Board
115VAC Fan Supply
F
an C
ontrol
V/F Capacitor Feedback (2)
Soft Start Control
Input Relay Control
Primary Current Feedback(2)
IGBT
Drive S
ignal
Primary
Current
Sensor
Primary
Current
Sensor
{
P
o
w
e
r
W
a
v
e
4
0
5
o
n
l
y
65V
AC
DC
Bus
Board Wire
Feeder
Recp.
40VDC
Can Supply +5VDC
Arc
Link Electrode
Sense
21 Lead
Voltage
Sense
Recp.
R232
Connector
Yellow
Thermal
LED
Status
Red/Green
LED
Thermostats
2
To
Feeder
FIGURE E.1 – PW-355 BLOCK LOGIC DIAGRAM
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