Lincoln Electric SVM159-A User Manual

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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
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