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G-4
ELECTRICAL DIAGRAMS
NA-5
LOGIC PC BOARD (L6242-2 & above) SCHEMATIC
3
2
1
3
4
SWITCH #2
4
4
1
4
2
3
4
1
2
3
44
4
SWITCH #1
SWITCH #2
2
Inch up with no contactor
delay
Methods of Burnback
1
1
SWITCH #2
3
SWITCH #2
4
3
1
2 4
4
D30
1.00K
R36
X6
7
14
1.50K
R38
D33
50V
.022
C3
D34
4011
X2
14
7
C17
D35
4011
X4
14
7
4011
X1
14
7
C18
X5
7
14
C16
C15
4011
X3
14
7
C28
100
R50
X8
6
5
J5
5
LED 7J
D31
50V
.022
C2
4.7
35V
C9
J3
1
47.5K
R16
X6
12
13
221K
R15
F
100
R35
D17
Q1
2N4401
500
C29
500
500
515
515
515
500500
500
515
INCH
S4
DOWN
592
C
PROCEDURE
PC BOARD
583C
PRESENT
VOLTAGE
50V
.022
C14
Q16
2N4403
LED 7E
100K
R58
J5
4
100
R49
7.68K
R46
J3
5
7.68K
R48
X8
4
3
Q10
2N4401
50V
.022
C23
J3
9
2.67K
R28
Q17
2N4403
475
R32
C33
2.67K
R23
515
500
500
515
515
A
587
FEED FORWARD
(TO POWER P.C. BOARD)
B
STRIKE
PROCEDURE
ENABLE
563
563
688
ENABLE
SHUT DOWN
ENABLE
ARC CONTROL
DISABLE
STRIKE PROCEDURE
561
B
A
TIME
INITIATE
CRATER
TIME OVER
BURNBACK
X2
4
5
6
J3
4
X4
4
5
6
1W
5.1V
DZ1
J3
6
C34
1.50K
R47
22.1K
R45
Q15
2N4401
100K
R57
22.1K
R33
C35
C36
E
Q7
2N4401
X2
3
2
1
C
B
X4
3
2
1
B
PC BOARD
PROCEDURE
Q14
2N4403
C26
15.0K
R34
X3
3
2
1
X5
6
5
X2
12
13
11
X4
11
12
13
7.68K
R44
X8
2
1
J2
6
S1
6
12
11
5
X6
10
11
22.1K
R39
X6
4
3
J3
7
X6
6
5
X6
8
9
50V
.022
C4
682
7.68K
R43
CURRENT
C37
S2
8
10
9
7
X5
10
11
D26
500
681
1A
1N4007
1000V
D19
1A
1N4007
1000V
D20
2.67K
R25
D25
J1
3
68.1K
R27
100K
R56
500
Q8
2N4401
50V
.022
C21
50V
.022
C24
CR5
500
6.81K
R37
2N5657
Q4
J1
6
SOURCE
POWER
OUTPUT
J2
3
515
500
515
C
D
D
689
OHMS
470
N.B.
PC BOARD
PROCEDURE
INITIATE
CRATER TIME
584C
A
CR6
E
N.F.
-4
CR3
LT1
R
HOT
ELECTRODE
ENABLE
HOLD-LOW
N.D.
530
7.68K
R41
1A
1N4004
400V
D23
100K
R62
Q13
2N4403
22.1K
R42
LED 7K
515
515
515
500
515
500
500
500
100
R17
J3
3
D32
LED 7C
START
D27
581A
J2
4
J2
5
475
R19
D15
22.1K
R18
D8
D9
1.00K
R5
22.1K
R24
4.7
35V
C5
1.50K
R11
D10
J3
2
D16
D13
2974
515
515
500
515
500500
515
500
515
515
LED 7B
DISABLE
687
BURNBACK
TIME OVER
SHUT DOWN
566
565
WELD TIME
OVER
PROCEDURE PC BOARD
528
CURRENT
CR4
STOP
S6
B
A
582
15.0K
R29
N.A.
581
J5
2
LED 7D
D28
D14
1.50K
R13
100
R12
10
25V
C7
475
R4
J2
1
100
R6
1.50K
R3
C6
D12
D11
1.00K
R2
D29
475
R14
J5
1
S5
START
G
N.F. SCHEMATIC SHOWN WITH DIP SWITCHES IN THE "UP" POSITION.
1A
1N4007
1000V
D18
X5
89
50V
.022
C27
10.0K
R40
Q11
2N4401
X5
2
1
C31
CIRCUITRY OF CONTROLS HAVING A COMMON CODE NUMBER.
J4
1
J5
6
X2
10
8
9
C32
BYPASS KIT (ALSO SEE SCHEMATIC A)
7.68K
R53
X1
5
6
4
X1
10
8
9
100K
R55
Q18
2N4403
Q12
2N4403
X1
2
1
3
Q9
2N4401
100K
R54
PER CHARTS BELOW
68.1K
R22
50V
.022
C19
J1
4
J1
1
2N5657
Q2
LED 7H
J4
2
J3
8
50V
.022
C25
N.C. DIP SWITCHES ARE TO BE SET TO SUIT APPLICATION
100K
R63
N.B. COMPONENTS INCLUDED WITH OPTIONAL LINC-FILL
2.67K
R20
515
500
515
500
515
500
1A
1N4004
400V
D22
A
A
N.F.
-1
560
PC BOARD
PROCEDURE
ENABLE
MONITOR
PRESET
CR2
564
PROCEDURE
PC BOARD
TRAVEL
589
PROCEDURE
ENABLE
WELD
610
CYCLE
N.A. SWITCH (SEE PROCEDURE P.C. BOARD SCHEMATIC)
NOTES:
DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS OR
N.E. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED
CIRCUIT BOARD MAY CHANGE WITHOUT AFFECTING THE
INTERCHANGEABILITY OF A COMPLETE BOARD, THIS
IS USED WITH LATER VOLTAGE BOARDS.
EARLIER VOLTAGE BOARDS. ARC CONTROL ENABLE
N.D. HOLD-LOW DISABLE IS USED WITH G1556-1 AND
MUST BE IN "STRIKE" POSITION TO START WELD
500
500
X3
4
5
6
S2
6
12
11
5
X3
12
13
11
D5
J2
2
D6
D2
D1
B1
(HS)
IN
7815
OUT
GND
X9
J4
6
J4
3
X8
7
14
100V
.22
C1
C30
500
T1C BLU
X3
8
9
10
515
4.7
35V
C13
B2
LED 7A
D7
D3
D4
500
50V
C12
515
N.F.
B
C
D
-3
C
A
C
SUPPLY
POWER
LOGIC
628
BLU
22VAC
1.50K
R1
4011
X7
14
7
PROCEDURE
PC BOARD
515
X7
8
9
10
S1
2
16
15
1
500
S1
4
14
13
3
475
R9
475
R10
50V
.022
C11
10
25V
C8
X6
2
1
S1
8
10
9
7
X7
12
13
11
22.1K
R52
X5
4
3
22.1K
R51
X1
11
12
13
J4
4
500
N.F. N.F.
-2
-1
-3
-4
N.F.
N.F.
A
D
PC BOARD
PROCEDURE
588
D
INITIATE
START
TIME
584S
CURRENT
C
PC BOARD
PROCEDURE
D
B
OVER
START TIME
OVER
WELD TIME
C
B
583S
THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY
Ch'ge.Sht.No.
ELECTRICAL SYMBOLS PER E1537
UNLESS OTHERWISE SPECIFIED)
GENERAL INFORMATION
MFD
NONE
SUBJECT
CLEVELAND, OHIO U.S.A.
ON 3 PLACE DECIMALS IS + .OO2
SCALE
RESISTORS = Ohms (
(
UNLESS OTHERWISE SPECIFIED)
CAPACITORS =
.022/50V
DIODES =
1A, 400V
(UNLESS OTHERWISE SPECIFIED)
1/4W
FILENAME: G2974_2DA
MAB
9-27-94
SHT.
LOGIC CIRCUIT
DATE
WITH PUBLISHED STANDARDS
G
ON ALL ANGLES IS + .5 OF A DEGREE
DR.
MATERIAL TOLERANCE ("t") TO AGREE
NA-5
NO.
CHK.
SUP'S'D'G.
2974
THE LINCOLN ELECTRIC CO.
TYPE
THE LINCOLN ELECTRIC CO.
THE LINCOLN ELECTRIC CO.
EQUIP.
LOGIC POWER SUPPLY DISTRIBUTION AND BYPASSING
J4
5
50V
.022
C22
Q6
2N4401
J5
3
50V
.022
C10
100K
R59
22.1K
R31
UNLESS OTHERWISE SPECIFIED TOLERANCE
ON 2 PLACE DECIMALS IS + .O2
ON HOLES SIZES PER E-2056
500
ENABLE
FEED
S3
INCH
UP
586
500
J1
2
18
63
37
X-
R-
7K
9
Q-
LED-
2
35
S-
5
1
B-
J-
2
DZ1-
2
68.1K
R30
LED 7G
1A
1N4007
1000V
D21
100K
R61
2N5657
Q5
1A
1N4004
400V
D24
50V
.022
C20
J1
5
500
500
PCB
PROCEDURE
CR1
585
AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF
EARTH GROUND CONNECTION
POWER SUPPLY SOURCE POINT
FRAME CONNECTION
COMMON CONNECTION
SUPPLY
VOLTAGE NET
X7
2
1
3
2N5657
Q3
S2
2
16
15
1
D-
LABELS
LAST NO. USED
X7
5
6
4
100K
R60
C-
METHODS OF TRAVEL & BURNBACK.
NA-5 SHIPPED CONNECTED FOR INDICATED
2
SWITCH #1
2
1
3
SWITCH #1
2
1
3
1
3
SWITCH #1
3
Yes
2
2
3
1
SWITCH #1
SWITCH #1
4
4
SWITCH #2
3
1
2 4
3
1
2
current
Start/stop with weld
Start/stop with switches
Methods of Travel
3
1
2 4
3
1
2
SWITCH #2
3
2
SWITCH #1
1
3
WATER
OR
FLUX
No
contactor delay
Wire feed stop with
delay
Inch up with contactor
SWITCH #1
2
receptacle)
Start with start switch
Stop after burn-back time
(Optional procedure
module installed in crater
SWITCH #1
SWITCH #1
1
3
1
(Optional procedure
Start with start switch
module installed in crater
Stop after crater time
receptacle)
Start with weld current
Stop with stop switch
1
637
2
1
3
4
SWITCH #2
44
SWITCH #2
2
Optional Crater Module Installed?
2
1
3
4
SWITCH #2
4
SWITCH #2
500
515 515
1-12-96D
G-4
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not available from Lincoln Electric. This information is provided
for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.
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