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G-3
ELECTRICAL DIAGRAMS
LN-9
OPERATING SCHEMATIC
1702
3-25-94A
8-2-96B
OPERATING SCHEMATIC
FI
NONE
1702
6-14-85
11-1-96
G1590
t
UNLESS OTHERWISE SPECIFIED TOLERANCE
ON HOLE SIZES PER E2056
ON 2 PLACE DECIMALS IS .02
WITH PUBLISHED STANDARDS.
ON 3 PLACE DECIMALS IS .002
ON ALL ANGLES IS .5 OF A DEGREE
MATERIAL TOLERANCE (" ") TO AGREE
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
EQUIP.
TYPE
SCALE
DR DATE CHK
REF.
SUBJECT
SUP'S'D'G
SHT.
NO.
THE LINCOLN ELECTRIC CO.
THIS SHEET CONTAINS PROPRIETARY INFORMATION
OWNED BY AND IS
NOT TO BE REPRODUCED, DISCLOSED OR USED
THE LINCOLN ELECTRIC CO.
G
G
WITHOUT THE EXPRESS PERMISSION OF
C101
TP
101
32A
7
32
C110
D101
C102
PT
101
D102
C111
SCR101
SCR102
F101
REV.
FWD
532
CR101
531
R1
115 VAC
T1
115 VAC
T2
28 VAC
526
527
S7
SWITCH
5
4
1
6
3
2A
502
504
CR101
HOT
COLD
HOT
2
4
S2A
HOT-COLD
INTERLOCK SWITCH
A
INPUT AND MOTOR POWER CIRCUIT
D106
D107
526
C109
528
D110
R103
D114
C114
525
+15V
Q101
628
C107
DZ101
+
D108
D109
601
602
DZ102
500
-10V
ZERO
VOLT
510
REFERENCE
S2B
500
530
D
D
530
CR501
524
CR101
D111
D112
R107
529
CR2
628
D115
R109
R108
D116
C115
Q103
R104
R106
R105
C108
+
C104
D113
521
Q102
C214
+
525
B
11 10
12
6
R201
5
Q207
2
R243
3
R203 R204
REF
13
C202
4
CW
R205
7
X201
C203
+
520
+10.00 V.
B
CONTROL POWER SUPPLY AND RELAY CIRCUIT
R206
R209
B
525
R207
C216
1
11
X202
12
2
3
4
+
R208
C206
C205
CW
CAL
9
8
10
5
C221
R211
R210
R242 R2
CW
631
633
WIRE SPEED
CONTROL
632
+
C215
12
13
-
+
B
14
X203
B
3
2
-
+
A
1
X203
4
11
R202
R244
C218
500
C212
C213
R218
511
512
R217
C217
525
B
5
6
-
+
D
7
X203
R221
R238
C208
C209
R222
CW
H1
3
2
-
+
A
1
X204
C219
525
B
4
C220
500
B
+
C210
R226
R239
R230
R231
D208
C223
Q203
D205
R227
R228
C211
QU201
C228
C105
540
R232
R234
500
B
PT
101
C225
R237
C227
Q206
Q205
R229
Q204
C224
CW
LO
D206
R233
R235
R236
628
B
R212
10
9
-
+
C
8
X203
R214
R220 R219
R241
R240
512
511
C
C
510A
10
9
-
+
B
8
X204
PIN
PIN
FS
CW
ACC
R216
C207
+
R215
D202
Q201
C226
R213
525
B
D204
DZ201
R224
R225
Q202
C222
D203
D201
524
B
C
MOTOR CONTROL CIRCUIT
A
B
R533
R534
C
C509
DZ
501
R513
15
525
2
6
4
B
OCI
501
R512
R538
Q501
R540
GAIN
CW
D517
R541
START
CW
R542
D
12
13
+
-
X502
14
R511
C507
R509
+
+
C508
C518
R510
PIN F
PIN S
A
1
X502
3
2
+
-
R507
WHITE
PIN A
PIN B
BLUE
C512
+
D506
R535
S
D
R519
G
Q502
R517
525
B
R516
D508
521A
E
500
B
C517
D505
C506
D
-
+
X501
1
2
3
R506
D504
R505
C505
DZ503
+
R532
D516
R539
667
E
R508
R518
C
X501
8
10
9
+
-
+
C510
C516
514
R515
R3
636
510B
"VOLTS"
CONTROL
R514
520
B
634
CW
635
D503
525
B
R537
2341
521A
500521525
B
D501
VOLTAGE P.C. BOARD RECEPTACLE
(SHOWN WITH JUMPER PLUG
FILTER P.C. BOARD PLUG
515
C519
R536
7
X501
B
-
+
6
5
510B
C504
R504
14
12
13
-
+
A
4
11
C521
500
C503
500
B
525
B
+
C520
B
X501
D502
C501
R502
CW
CAL
R503
510B
C502
F501
POS
R501
TP
501
67
21
S3
POLARITY
SWITCH
NEG
E
VOLTAGE CONTROL CIRCUIT
POWER CIRCUIT
C101
C102
C103
C104
C105
C106
C107
C108
C109
C110
C111
C112
C113
C114
C115
D101
D102
D103
D104
THRU
D116
1A
.047 MFD
.047 MFD
.022 MFD
2.7 MFD
.15 MFD
.005 MFD
.02 MFD
.02 MFD
.022 MFD
.022 MFD
*
16A
16A
16A
}
F101
R101
R102
R103
R104
R105
R106
R107
R108
R109
330 OHM
100K OHM
2.2K OHM
15K OHM
CR101
3PDT 24 VDC
SCR101
SCR102
12A, 400V
12A, 400V
Q101
Q102
Q103
2N5655
2N5655
MPS A92
*
C105 AND PT101 PRIMARY ARE SHOWN IN SECTION C
PT101
TP102
DZ101
DZ102
1:1:1 PULSE TRANS.
TRANSIENT PROTECTOR
15V, 5W
*
C201
C202
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
THRU
C228
.022 MFD
.022 MFD
.0033 MFD
18 MFD
.047 MFD
.15 MFD
.022 MFD
.022 MFD
18 MFD
}
.022 MFD
D201
THRU
D206
D208
R201
1A.
}
1A.
1K OHM
R202
R203
R204
R205
R206
R207
270 OHM
500 OHM TRIMMER
1.00K OHM 1/4W 1%
2.94K OHM 1/4W 1%
15K OHM
10K OHM
R208
R209
R210
R211
R212
R213
R214
R215
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
R232
R233
R234
R235
R236
R237
R238
100K OHM TRIMMER
33K OHM
10K OHM
5.6K OHM
15K OHM
47K OHM
15K OHM
100K OHM
1K OHM
1K OHM
1K OHM
33K OHM
50K OHM TRIMMER
15K OHM
10K OHM TRIMMER
33K OHM
100K OHM
1K OHM
6.8K OHM
10K OHM
20K OHM TRIMMER
27K OHM
15 OHM
100 OHM
6.8K OHM
2.7K OHM
10K OHM
15K OHM
10K OHM
1M OHM
D510
D511
R520
R522
R521
R523
5
6
B
+
-
4
11
7
X502
C511
525
C522
500
B
R530
C513
D512
BYPASS TABS
SHUTDOWN
R531
530
CR501
Q503
D513
DZ502
R524
525
CR
501
D514
CONTROL CIRCUIT
C401
500 MFD
4.7 MFD
C402
C403
C404
THRU
D404
X401
R401
DM401
.022 MFD
27 MFD
}
C407
D401
}
1A
VOLTAGE REGULATOR
DIGITAL METER
24.3K OHM 1/4W 1%
R402
R403
R406
R407
R408
R409
2.80K OHM 1/4W 1%
7.68K OHM 1/4W 1%
2K OHM TRIMMER
METER CIRCUIT
C501
C502
C503
C504
C505
C506
C507
C508
C509
C510
C511
C512
C513
C514
C515
C516
C517
C518
C519
THRU
C522
.1 MFD
.022 MFD
.022 MFD
39 MFD
.022 MFD
.022 MFD
27 MFD
.022 MFD
.022 MFD
39 MFD
.022 MFD
}
D501
THRU
D518
CR501
DZ501
DZ502
DZ503
}
20V, 1W
S.P.D.T. 24VDC
1 AMP
15V, 1W
5.1V
OPTO-ISOLATOR
Q501
2N4123
Q502
Q503
X501
2N4857
MPSA42
X502
I.C. QUAD OP-AMP
I.C. QUAD OP-AMP
TP501
TRANSIENT
PROTECTOR
R501
R502
R503
R504
R505
R506
R507
R508
R509
R510
R511
R512
R513
R514
R515
R516
R517
R518
R519
R520
R521
R522
R523
R524
44.2K OHM 1/4W 1%
500 OHM TRIMMER
4.75K OHM 1/4W 1%
100K OHM
27K OHM
15K OHM
10K OHM
2.2K OHM
2.7MEG OHM
4.7K OHM
100K OHM
1K OHM
2.7MEG OHM
5.6K OHM
1.8K OHM
100K OHM
1K OHM
270 OHM
100K OHM
15K OHM
56K OHM
330K OHM
22K OHM
4.7K OHM
R525
4.7K OHM
R526
R527
R528
22K OHM
22K OHM
22K OHM
2.2K OHM
27K OHM
100K OHM
27K OHM
10K OHM
R529
R530
R531
R532
R533
R534
R535
R536
R537
R538
R539
R540
R541
R542
100 OHM
1K OHM
270 OHM
33K OHM
56K OHM
27K OHM
5K OHM TRIMMER
2K OHM TRIMMER
5.6K OHM
B
VOLTAGE CIRCUIT
R1
2 OHM 50W
COMPONENTS
R2
R3
R4
10K OHM 2W POT.
10K OHM 2W POT.
22K OHM
CR2
WELD CURRENT-
REED SWITCH
CR4
G.L.P. REED SWITCH
S1
S2
S3
S4
S5
S6
S7
SPST TRIGGER SWITCH
DPDT POLARITY SWITCH
DPDT
CENT. OFF
HOT-COLD
INTERLOCK SWITCH
SPST G.L.P. RESET SWITCH
DPDT SET-ACTUAL SWITCH
3 POLE VOLTS-SPEED SELECTOR SWITCH
DPDT DIRECTION SWITCH
T1
T2
POWER SUPPLY TRANSFORMER
TRIGGER SUPPLY TRANSFORMER
COMPONENTS NOT ON P.C. BOARD
CIRCUIT
A
C
E
F
B
F
D
E
F
G
G
A
B
D
B & D
KEY TO SYMBOLS
INPUT CABLE CONNECTION
POWER OR SIGNAL SOURCE POINT
REMOVABLE CONNECTION
COMMON CONNECTION
A
THRU
G
SOURCE POINT CIRCUIT LOCATION
SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT
BOARD MAY CHANGE WITHOUT AFFECTING THE INTERCHANGEABILITY
COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON
CODE NUMBER.
OF A COMPLETE BOARD, THIS DIAGRAM MAY NOT SHOW THE EXACT
LEAD COLOR CODING
B - BLACK
R - RED
U - BLUE
W - WHITE
8
C
-
+
X502
10
9
R525
R526
+
C515
R528
C514
R527
R529
R4
533
CR4
S4
G.L.P. RESET
500
B
GND
F
SHUTDOWN CIRCUIT
534
R409
R408
C407
R407
R406
C406
CW
561
R402
R401
C404
CW
CW
510A
510B
602
B
601
B
D402
D401
D403
D404
+
C401
IN
GND
X401
OUT
1
2
C
C402
+
E
510
510C
DM401
A
3
4
TP5
+5V
+
C403
R403
TP4
9
10
11
12
C3
S6
513
S5
511
C
SET
C2
514
E
512
C
515
E
5
6
7
VOLTS
8
IN./MIN.
510
ACTUAL
LO
518
562
518
HI
M/MIN
C1
1
2
3
4
516
517
G
METER CIRCUIT
2
667
627
541
+
D507
HOT COLD
SWITCH
C204
C201
+
+
D515
D518
B
560
ELECTRICAL SYMBOLS PER E1537
32A
18 MFD
FOR VOLTMETER P.C. BOARDS
L6687-1 OR HIGHER USE S21145
SCHEMATIC FOR COMPONENT
VALUES AND CIRCUIT CONNECTIONS.
R239
R240
R241
R242
R243
R244
X201
15K OHM
5.6K OHM
15K OHM
560 OHM
10 OHM
270 OHM
I.C. REGULATOR
X202
X203
I.C. QUAD OP-AMP
X204
I.C. QUAD OP-AMP
Q201
Q202
Q203
Q204
Q205
Q206
Q207
2N4123
}
2N4125
2N4123
2N5816
2N6027
6.8V.
QU201
DZ201
517
R5
0.1 OHM
F
A
TP1
150VAC TRANSIENT PROTECTOR
C406
1K OHM TRIMMER
102K OHM 1/4W 1%
10K OHM TRIMMER
R5
LN-9 ABOVE CODE
9131 AND LN-9F
USED ON LN-9
BELOW CODE 9131
B
525
R223
555
D
510B
INSTALLED). EARLIER VOLTAGE
P.C. BOARDS DO NOT HAVE THE
4 PIN RECEPTACLE AND 521A IS 521.
.005 MFD
.01 MFD
50 MFD
150 MFD
.005 MFD
1A 1000V
D105
1A 1000V
D106
10V, 5W
1/2 A. SLOW BLOW FUSE
40 OHM 12 W
100K OHM
1K OHM
10K OHM
TRANSIENT PROTECTOR
TP101
4.7 MFD
.47 MFD
4 MFD
4.7 MFD
4.7 MFD
100pf
10K OHM
I.C. TACHOMETER
}
D509 AND CR501 N.C.
IN SECTION
5 AMP CIRCUIT BREAKER
D509
521
522
TRIGGER
INTERLOCK
OFF
TRIGGER
INTERLOCK
ON
10 VAC
MOTOR
THERMOSTAT
R102
626B
TP1
C106
627B
R101
W
626
TRIGGER AND TACH CIRCUIT
525
B
555
TACH
PICK-UP
P.C. BOARD
.005 MFD
4.7 MFD
4.0 MFD
.47 MFD
1.8 MFD
4.7 MFD
1 MFD
.47 MFD
F501
1 8 AMP FAST
/
BLOW FUSE
OCI501
FOR VOLTAGE P.C. BOARDS L6084-4 OR HIGHER USE L8388 SCHEMATIC FOR COMPONENT
VALUES AND CIRCUIT CONNECTIONS.
115 VAC
24 VAC
620
621
530
622
623
TRIGGER
BOARD
622
623
620
621
D
B
B
525
B
31
32A
531
500
TRIGGER
SWITCH
S1
PLUG INSTALLED)
BURNBACK RECEPTACLE
(SHOWN WITH JUMPER
C103
PT
101
TP
102
D103
R
U
B
539
C112
D104
D105
C113
CR101
MOTOR
FIELD
31
INTERLOCK
WIRE FEED
DIRECTION
7
LN-9 AND LN-9F (METRIC)
CONTACTS ARE SHOWN
10 OHM
B
11
FOR OPTIONAL PULSE POWER
500
530
G-3
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NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.