Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 170

F-110
FIGURE F.38 – SERIAL LOOP WIRING DIAGRAM
Serial Loop TxD
Master
Transmit &
RxD
Receive Lines
Display Board
Port Switch
Open: DK Board S.L.
Comunication
enabled
Closed: DK Board S.L.
Comunication
disabled
WF1
Port Switch
Open: WF1 S.L.
Comunication
enabled
Closed: WF1 S.L.
Comunication
disabled
WF2
Port Switch
Open: WF2 S.L.
Comunication
enabled
Closed: WF2 S.L.
Comunication
disabled
CONTROL BOARD
TROUBLESHOOTING & REPAIR
J22
5
DK+
J26 (263)
3
DK-
J26 (264)
4
WF+
J27 (111A)
1
WF-
(112A)
J27
4
OPT+
(117A)
J28
1
OPT- (118A)
J28
4
J22
4
POWER WAVE 450
(5R)
5
40mA current supply
DISPLAY BOARD
POWER BOARD
J14
6
J14
3
14-pin
WF1
8-pin
P83
L H
P83
M G
14-pin
WF2
8-pin
P82
L H
P82
G
M
POWER BOARD
(5W)
4
40mA
current path
F-110
J44
TRN
REC
WF1
82(+)
TRN
REC
81(-)
WF2
82(+)
TRN
REC
81(-)
J44