Lincoln Electric 11141 Service Manual page 43

E-5
Input switch
Auxiliary
{
P
Transformer
o
220 VAC
w
e
r
W
a
v
e
42VAC
4
220
0
5
Receptacle
o
n
l
y
OUTPUT RECTIFIER AND CHOKE
The output rectifier receives the AC output from the
main transformer secondary and rectifies it to a DC
voltage level. Since the output choke is in series with
the negative leg of the output rectifier and also in series
with the welding load, a filtered DC output is applied to
the machine's output terminals.
THEORY OF OPERATION
FIGURE E.5 – OUTPUT RECTIFIER AND CHOKE
Main Switch Board
Input
Rectifier
Reconnect
Switch
Fan
115VAC Fan Supply
Machine Control Supply
40VDC
+15VDC, -15VDC, +5VDC
Power
Board
RS232 Supply +5VDC
Can Supply +5VDC
DC
Bus
Board
40VDC
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
POWER WAVE
Primary
Current
Sensor
Primary
Current
Sensor
Primary Current Feedback(2)
Input Relay Control
Soft Start Control
V/F Capacitor Feedback (2)
Control Board
Arc
Electrode
Link
Sense
Wire
Feeder
Recp.
Thermostats
To
Feeder
® 355M/405M
To Control
Board
Positive
Output
Terminal
Choke
Negative
Output
Terminal
21 Lead
Voltage
R232
Sense
Connector
Recp.
2
E-5
Yellow
Thermal
LED
Status
Red/Green
LED