Lincoln Electric LF-72/74 Welder User Manual


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ELECTRICAL DIAGRAMS
G-5
LF-72/74
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11195, 11196, 11197, (L12484) LF-74
L12484
A
C
AVITY NUMBERING SEQUENCE
(COMPONENT SIDE OFP.C. BOARD)
J3
2
1
J5,J8
J
9,J60
4
3
6
1
COMMON ANALOG P.C. BOARD
A
D
C
B
E
554
5
56
TRIGGER
CONNECTOR
J13
559
515
558
COLD FEED
S1
F
EED
PLATE
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
111213141516
J14
559
10
12345678
9
111213141516
12
J3
1234
J2
1
4
3
2
6
5
P
10
8
7
MOTOR /
GEARBOX
W
515
558
589
587
554
A
550
551
550
576
577
575C
553
552
J7
3
4
1
2
2
4
K
E
Y
580
552A
605
606
601
607
608
5
6
515A
R
T
ACH
U
B
THERMAL LED
1W
563
563
562
5
75B
562
1W
1B
1
0K/2W
3
2
1
77
7
6
2
1
P7
4
3
REMOTE
CONTROL
VOLTAGE
P
OTENTIOMETER
(OPTIONAL)
75A
7
6A
77A
W
IRE FEED
SPEED
C
ONTROL
POTENTIOMETER
5
77
576
575
3
2
1
10K/2W
589
TRIGGER
INTERLOCK
S2
587
-
+
580
42
41
POST-FLOW
BURNBACK
TIMER KIT
(OPTIONAL)
J60
12345678
601
515A
605 607
608
6
06A
14 PIN
AMPHENOL
CONNECTOR
TO POWER
S
OURCE
OUTPUT
CONTROL
A
J12
B
2C
4
D
77A
E
76A
F
75A
G
H
41
I
J
42
K
L
M
67
N
REMOTE
VOLTAGE
CONTROL
42VAC
SENSE
2-STEP
GAS PURGE
L1
75
7
6
77
7
5
L
2
L3
575
5
75C
575B
INPUT ELECTRODE
CABLE CONNECTION
J1,J14
9
8
16
1
5
4
8
1
J2
606
6
06A
1B
B
B
W
5
22
R
U
B
2
1
P6
4
3
L5
2
1
P4
4
3
L4
NORMALSPEED
HIGH TORQUE
5
51B
551A
551A
5
51B
521
522
521
2
1
4
3
A
2
1
4
3
A
L6
5
51
B
B
P
11
552
5
53
GAS
S
OLENOID
552B
BRIDGE
DIODE
RECTIFIER
M
OUNTED
B
AFFLE
552B
5
52A
P11
NOTES:
N.A. CAVITYNUMBERINGSEQUENCEASVIEWED FROMCOMPONENT SIDE
OFBOARD.
N.B. CAVITYNUMBERINGSEQUENCEASVIEWED FROM LEAD SIDE OF
CONNECTOR.
N.C. TOGGLESWITCHES AND POTENTIOMETERSSHOWN FROM
CONNECTIONSIDE OF SWITCH.
N.D. PINNEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD
OF LEDSOCKET.
N.E. PLACE P11 INAPPROPRIATEPOSITION FORSPEED OR TORQUE.
CONNECTIONSHOWNIS FOR NORMAL SPEED. NOTE: NORMAL SPEED
NOT AVAILABLE ONHIGH TORQUE MODEL. HIGH TORQUE NOTAVAILABLE ON
NORMALSPEED MODEL.
N.B.
N.B.
N.B.
N.C.
N.C.
N.C.
N.C.
N.A.
N.A.
N.B.
N.D.
N.E.
N.E.
G-5
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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