Lincoln Electric SVM159-A User Manual
Section E-1
Section E-1
POWER WAVE 355/405
Theory of Operation
.............................................................................................................
Section E
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
Control Board
Choke
Positive
Output
Terminal
Output
Terminal
Negative
Output
Terminal
Output
Terminal
To Control
Board
Board
Current
Feedback
Reconnect
Switch
Switch
Output V
oltage Sense
Input switch
Input
Rectifier
Rectifier
Auxiliary
Transformer
Transformer
Fan
Power
Board
Board
220
Receptacle
Receptacle
RS232 Supply +5VDC
Machine Control Supply
+15VDC, -15VDC, +5VDC
+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
Current
Sensor
Primary
Current
Sensor
Current
Sensor
{
P
o
w
e
r
W
a
v
e
v
e
4
0
5
0
5
o
n
n
l
y
65V
AC
DC
Bus
Board
Wire
Feeder
Recp.
40VDC
Can Supply +5VDC
Arc
Link
Link
Electrode
Sense
Sense
21 Lead
Voltage
Sense
Recp.
Recp.
R232
Connector
Connector
Yellow
Thermal
LED
Thermal
LED
Status
Red/Green
LED
Red/Green
LED
Thermostats
2
2
To
Feeder
FIGURE E.1 – PW-355 BLOCK LOGIC DIAGRAM