Lincoln Electric LF-72/74 Welder User Manual


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ELECTRICAL DIAGRAMS
G-2
LF-72/74
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11075, 11076, 11077 (L12146) LF-72
L12146
A
CAVITY NUMBERING SEQUENCE
(
COMPONENT SIDE OF P.C.BOARD)
J3
2
1
J5,J8
J9,J60
4
3
6
1
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
C
OLOR CODE
B - BLACK
R- RED
U - BLUE
COMMON ANALOG P.C. BOARD
A
D
C
B
E
554
556
TRIGGER
CONNECTOR
J4
559
515
558
COLD FEED
S1
F
EED
P
LATE
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
C
OLOR CODE
B - BLACK
R- RED
U - BLUE
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
C
OLOR CODE
B - BLACK
R- RED
U - BLUE
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
C
OLOR CODE
B - BLACK
W
- WHITE
R- RED
U - BLUE
TRIGGER
INPUT
6
7
J1
556
10
12345678
9
11 12 13 14 15 16
J14
559
10
12345678
9
11 12 13 14 15 16
12
J3
1234
J2
1
4
3
2
6
5
P
5
8
7
MOTOR /
GEARBOX
WB
B
W
L5
515
558
589
587
554
551
550
551
550
576
577
575C
553
552
J7
3
4
1
2
24
K
E
Y
580
552A
605
606
601
607
608
5 6
515A
R
T
ACH
U
B
THERMAL LED
W
563
5
63
562
575B
562
WB
P9
12345678
50 5141A
552C
10K/2W
3
2
1
77
76
2
1
P
7
4
3
REMOTE
C
ONTROL
V
OLTAGE
POTENTIOMETER
(
OPTIONAL)
75A
76A
7
7A
WIRE FEED
S
PEED
CONTROL
POTENTIOMETER
5
77A
576A
575A
3
2
1
1
0K/2W
1
4
3
2
6
5
P8
5
75
5
77
5
76
589
TRIGGER
INTERLOCK
S2
587
-
+
BRIDGE
D
IODE
R
ECTIFIER
M
OUNTED
B
AFFLE
5
80
42
5
52C
552A
4
1
41A
552B
POST-FLOW
B
URNBACK
T
IMER KIT
(OPTIONAL)
J60
1
2345678
601
5
15A
605 607
6
08
6
06A
5
52
553
GAS
SOLENOID
1
4PIN
AMPHENOL
CONNECTOR
T
OPOWER
SOURCE
OUTPUT
CONTROL
A
J6
B
2C
4D
7
7A
E
76A
F
75A
G
H
41
I
J
42
K
L
M
67
N
R
EMOTE
VOLTAGE
CONTROL
42VAC
SENSE
552B
ARC VOLTAGE
ARC
CURRENT
51
50
2-STEP
GAS PURGE
L4
L1
577A
576A
575A
75
76
77
7
5
L2
L3
575
5
75C
575B
INPUT ELECTRODE
CABLE CONNECTION
J1,J14
9
8
1
6
1
5
4
8
1
J2
606
6
06A
B
9
1
0
NOTES:
N.A. CAVITYNUMBERINGSEQUENCEASVIEWED FROMCOMPONENT SIDE OF BOARD.
N.B. CAVITYNUMBERINGSEQUENCEASVIEWED FROM LEAD SIDE OF CONNECTOR.
N.C. TOGGLESWITCHESANDPOTENTIOMETERS SHOWN FROMCONNECTIONSIDE OF SWITCH.
N.D. PINNEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD OF LED SOCKET.
N.B.
N.B.
N.B.
N.D.
N.C.
N.C.
N.C.
N.C.
N.A.
N.A.
N.B.
N.B.
G-2
NOTE: This diagram is for reference only
. It may not be accurate for all machines covered by this manual.
The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.
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