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THEORY OF OPERATION
EE-4 EE-4
V160-S & -T
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NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
FIGURE EE.4 – INVERTER BOARD
INVERTER BOARD
The inverter board includes the following circuits:
- Inverter circuit: Transforms the DC current at 80KHz
and feeds the main transformer. The current is regu-
lated via Pulse Width Modulation
- Main transformer: It has two functions:
1) gives the correct output voltage for welding
2) Insulates the operator side from the output
line
- Output circuit: The output diodes rectify the output
the current from the main transformer. The choke fil-
ters the output current.The shunt provides output
feedback information to the control board.
INVERTER BOARD
W05X0190
(SCHEMATIC X0190)
GND
DC-
DC+
W1
W2
INPUT BOARD
W05X0250
(SCHEMATIC X0203)
Y/G
BLACK
RED
W1DC-DC-
+
-
JP1
JP1
JP2
G
ND
A
C2
AC1
BROWN
BLUE
BLACK
WHITE
S1
1
3
4
2
DC+
DC-A
115/230/1/50/60
V
ac
GREEN
FAN
J1
W
ELD CONTROLLER
W
05X0233
(SCHEMATIC X0233)
DISPLAY BOARD
W05X0245
(
SCHEMATIC X0245)
JP1
CW
REMOTE
CONNECTOR
W
ARNING HIGH VOLTAGE CAN KILL
• Do not operate with coers removed.
• Disconnect input power by unplugging
power cord before servicing.
• Do not touch electrically live parts.
• Only qualified persons should install,
use or service this machine
1
2
3
6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10
26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
1 2 3 4 5 6 7 8
D E C B A
METER BOARD
W05X0207
(
SCHEMATIC X0207)