Lincoln Electric LF-72/74 Service Manual page 108

G-2
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11075, 11076, 11077 (L12146) LF-72
CAVITY NUMBERING SEQUENCE
(COMPONENT SIDE OF P.C. BOARD)
1 1 2 1
J3 J7
J2
2 3 4 4
1
1 4
J5,J8
J1,J14
J9,J60
8 9
5
552B
552
GAS
SOLENOID
553
14 PIN
AMPHENOL
CONNECTOR
TO POWER
SOURCE
A
B
C 2
OUTPUT
CONTROL
D 4
77A
E
REMOTE
VOLTAGE
F 76A
CONTROL
G 75A
H
41
I
42VAC ARC
J 50
CURRENT
K 42
51
ARC VOLTAGE L
M
SENSE N 67
J6
NOTES:
N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROM COMPONENT SIDE OF BOARD.
N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF CONNECTOR.
N.C. TOGGLESWITCHES AND POTENTIOMETERS SHOWN FROM CONNECTION SIDE OF SWITCH.
N.D. PIN NEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD OF LED SOCKET.
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.
GENERAL INFORMATION GENERAL INFORMATION GENERAL INFORMATION GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537 ELECTRICAL SYMBOLS PER E1537 ELECTRICAL SYMBOLS PER E1537 ELECTRICAL SYMBOLS PER E1537
COLOR CODE COLOR CODE COLOR CODE COLOR CODE
3
B - B - B - B - BLACK BLACK BLACK BLACK
W - WHITE
6 R - R - R - R - RED RED RED RED
U - U - U - U - BLUE BLUE BLUE BLUE
8
16
552B
41A BAFFLE
MOUNTED
RECTIFIER
DIODE
BRIDGE
552A
552C
L4
L5
41 580 42
575
575B
575C
L1
580
577 575C 576
550 551
562 554 552A 553 556
N.B.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
J1
ELECTRICAL DIAGRAMS
INPUT ELECTRODE
CABLE CONNECTION
67
L2
FEED
PLATE
TACH
R
MOTOR /
U
GEARBOX
1
B
2
3
563
4
562
B W
575B
5
6
7
551 B
8 W
550
P5
N.B.
4 2
563 587 608 558 601 589
COMMON ANALOG P.C. BOARD K
552 E 559 515
605 607 W Y
606
1 2 3 4 5 6 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
J2 J3 J14
575 1 575A 577A
WIRE FEED
3
576 2 576A
576A 2 10K/2W
577 3 577A
1
4 POTENTIOMETER
575A
5
N.C.
6
P8
N.B.
77
75A 1 75
3 CONTROL
10K/2W
76A 2 76 76 2
1
POTENTIOMETER
77A 3 77
(OPTIONAL)
75
N.C.
4
P7
N.B.
BURNBACK
POST-FLOW
J60 (OPTIONAL)
1 2 3 4 5 6 7 8
601 515A 605 607
606A 608
N.A.
P9
556 A
9 10
1 2 3 4 5 6 7 8
B
554
C
50 41A 51 552C
D
E
606A
N.B.
B
N.D.
L3
606
THERMAL LED
W
COLD FEED
558
515A
515
559
GAS PURGE
N.C.
TRIGGER
INTERLOCK
589
587
2-STEP
N.C.
N.A.
G-2
SPEED
CONTROL
REMOTE
VOLTAGE
TIMER KIT
TRIGGER
INPUT
TRIGGER
CONNECTOR
J4
B
S1
S2
A
L12146
LF-72/74