Lincoln Electric LN-25 Service Manual page 81

OPERATING SCHEMATIC — CODES 9812 AND BELOW
WIRE SPEED DIAL
RANGE SWITCH
HI - LO
S2
N.B.
522
523
632
MAX.
633 R1 631
10K OHMS
N.B.
WIRE SPEED
CONTROL RHEOSTAT
N.F.
WIRE FEED
VOLTMETER
MODE SWITCH
+
B W
VV - CV
VM
667 621
N.B. 524
BLACK
TO WORK
CLIP
S1
POLARITY
POS
SWITCH
67
N.B.
A
N.H.
J5 B
TRIGGER
C
CONNECTOR
D
GUN CABLE
E
67
W
539
HALL R
B
U
541 EFFECT
MODULE B
N.F.
CONTACTOR COIL
CONTACTOR
N.H.
INPUT CABLE
X1, X2 TL431IP PRECISION REFERENCE
X3 MC14584B HEX SCHMITT TRIGGER
X4 LM2907 FREQUENCY TO VOLTAGE CONVERTER
X5, X6 LM324 QUAD OP-AMP
X7 THRU X9 LM2901 QUAD COMPARATOR
X10 MC14013B D-TYPE FLIP-FLOP
X11 MC14066B QUAD ANALOG SWITCH
OCI 4N35 OPTO-COUPLER
COLOR LEGEND
B = BLACK
U = BLUE
H = BROWN
R = RED
G = GREEN
W = WHITE
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.
667
D4
1N4005
C1
D32 D1
.05
1N4005
600V
621
TP1
150V
45J
621
S3
509
523
621
NEG
667 3
621 1
667
622A 4
500A 2
*
622A
J1
SOLENOID
PURGE
KIT PLUG
N.F.
500A
621
624A 4
621 1
ARC SOLENOID P.C. BD.
608
512 3
SEE SOLENOID KIT
SCHEMATIC
606 2
*
J2
N.F.
GAS SOLENOID VALVE
509 1
524 8
522 5
523 7
523 4
633 6
631 9
632
3
*
J4
CONTACTOR
P.C. BD. PLUG
N.A.
OPTIONAL
REMOTE PLUG
606 606 10
9
530 530
530A 530A 5
622A 622A 12
500A 500A
8
622 622 3
500 500 1
512 512 4
667 667 6
7
624 624
621 621 11
667
607 607 2
*
J3
150K
N.F., N.G.
N.J.
606
1
530 D13 +
530
CONTACTOR
2 10K
530A
P.C. BD.
530A
3 500
607 J6
4 512
500p
512 667
5
621
500
J7
6
607
606
SEE CONTACTOR 624
KIT SCHEMATIC
OPTIONAL
N.F.
TIMER PLUG
4 2 1 3
530C 500
530B 500
2 4
1 3
N.B., N.F., N.L.
COLD INCH J2
PUSH BUTTON SWITCH
530B
530C
ELECTRICAL DIAGRAMS
24A 600V
D6
DYNAMIC BRAKING
4 3
D27 D2 512
Q15
+12VDC C8 C9
1N4005 + 4700
+ 7.68K
7.5-9.0V
Q1 470 470
5W
350V 350V
R4
509
10.0
DZ4
Q2 D3
621 +9.50VDC
C2 5A R5
16V
+ C45
400V
470 5W 100 2.43K
1W 4.7
D5
350V 300mA
3300
35V
400V
Q3 Q4
10
2N4123 2N4123
C4
2W 13.7K
R9
50
1.00K
+ 25V C7
NEGATIVE
C3 500 5.62K
1.8
SUPPLY
R91
1
20V
+ 6
1.3K C6 CW
+ 1
X1 8 -
C5 1
REF. + X2 8
TL431 X8
- 3300 7
6 TL431 REF 4.75K
+
50V -
6
500p
512
TO HALL EFFECT
512 R
22.1K
10K
F-V CONVERTER
ACTUAL-SPEED
BUFFER
1 14
555 U R19 TACH INPUT NC X
2 13
10K Ic NC X
X4
3 12 6
/ GND -
22.1K 4 11
IBIAS TACH INPUT
C13 X5
10 5
CW 5
ISOURCE IBIAS
100p
6 9 +
X V+ 509
NC
1000V
7 8
+ C17 X NC ISINK
100K
C16 LM2907
.33
.0033
B 50V
500 200V
509
68.1K
C14 C15 10K
18
667 15V
44.2K 500p
V.V. SCALER
6.81K
R95
D14
13
-
14
3
SET-SPEED SCALER/BUFFER
+ 4.75K X6
12
1
2 METALS
X6 R94 +
2 13.7K 102K
1% 4.75K
-
16.5K
9
-
1/4W
8 2
1
-
X6
10
4.75K
+ X5
3
500p
500p +
5
+
7
44.2K 2.8K
2
X6
6
-
1
500p
8
-
14
TRIGGER SENSING 512 X8
9
+
4
-
D23
15.0K 15.0K
22.1K X8
22.1K
5
4 +
R73 -
2
100 X7
5
+ D29
Q12 10
-
R76 R78 200mA 13
3.3K X8
D25 30V
10K 33.2K 11
5W
+
C32
D24 + 26.7K
R72 1.0
35V
509 512
9
+
14
22.1K
13.7K X7
8
-
150K 22.1K
15.0K
R66
D18
7
+
11
1 D22
X7 +
D21 13
6
- X7 4 4
D19 D20
10
- C38
C34 X5 C36 X6
C30
1.8 C31
44.2K LM2901
20V 1.8 26.7K LM224 LM224
OVER-VOLTAGE
20V
11 11
SHUT DOWN
C35 C37
CONTROL BOARD
495
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537.
CAVITY NUMBERING SEQUENCE
CAPACITORS = mfd/VOLTS (.022/25V UNLESS OTHERWISE SPECIFIED).
(COMPONENT SIDE OF P.C. BOARD)
RESISTORS = OHMS (1/4 WATT UNLESS OTHERWISE SPECIFIED).
1 3
1 4 1 4 7 1 4 7 10 DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED).
2 4
2 5 2 5 8 2 5 8 11
= COMMON CONNECTION
3 6 3 6 9 3 6 9 12
J1, J7
= SOURCE POINT CIRCUIT LOCATION
J6 J4 J3
*
= CONNECTOR CAVITY NUMBER
D7
14 22.1K
1 2
Q14 C12 3 4
X3
4700 5 X3 R89 X3
200mA
X
6W 4584B
C47 OCI1 22.1K
30V
22.1K 7 4N35
C44 C46
6 4
DZ1 C10 100p
+ 100K C11 .001
12V 20
.0022
512 400V 1000V
1W
50V 400V
495
512
Q10
-9V DC
200mA
30V
D11
C22
+
3
10 C23 22.1K
1
Q11 D10 3.32K
25V 25V
2N4125 + 18.2K
50
2
R31
4 KHZ
X10
1 14
X Q1 VDD
7
+ OSCILLATOR 2 13
Q2
/Q1 X
1
3 12
X9 CLOCK 1 /Q2
6 4 11
- RESET 1 CLOCK 2
5 10
C18 C19 DL RESET 2
6 9
+
SET 1 D2 512
+ 7 8
VSS SET 2
18
18
MC14O13B
15V 15V 150K
R27
1
2
1.00M
10K 22.1K C21
.001
PWM
400V
C20 4
-
7 9 Q5
2
R25 - R34
X9 200mA
8 5
+ 30V
3.32K X5 22.1K
10
+ D8
R35
COMPARATOR
26.7K
512
509
22.1K
ACCELERATION
39.2K
C28
11
+
C24
- X9
512 10
13 .001
1 13 3.92K
-
R56 X5 400V
C43
D16 14 5.62K
+
26.7K
12 2.43K
267
22.1K
512 8
C27 -
+ C49
14
4.7 X9 100p
1.50K
35V 9 1000v
+ R45
C48
+
100p C25
26.7K
1000v 18
D17
15V 22.1K
R61
CURRENT LIMITING
+ C29
512 100K
1.0
10K
35V
1.00K
22.1K 22.1K
2 1 NOTES:
QCI1
4N35 N.A. WHEN A CONTACTOR IS NOT USED, A JUMPER PLUG MUST BE INSTALLED
2 UNLESS OPTIONAL REMOTE OUTPUT KIT IS BEING USED.
D28
N.B. CONNECTIONS AS VIEWED FROM BACK OF RHEOSTAT AND SWITCHES.
1.00K
N.C. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY
Q13
200mA CHANGE WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD,
C33
30V
THIS DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF
CONTROLS HAVING A COMMON CODE NUMBER.
N.D. ON G1757-2 THRU G1757-5 P.C. BOARDS, A 1 8 AMP FUSE INTERRUPTS THE
500A. LEAD. ON THE G1757-1 P.C. BOARD A 5 AMP SLOW BLOW FUSE WAS USED
SHOOT-THRU PROTECTION
TO INTERRUPT THE 667 LEAD. R72 WAS 1.5K AND THERE WAS NO R86.
N.E. ACTUAL CIRCUIT OF X3.
5
512
9
X
3 3 3 14 14
X10 X11 11
X7 X8 X9
C40 C41
C39 C42
4066B
LM2901 LM2901 MC14013B
13
12 12 12 7 7
N.F. ITEM FACTORY INSTALLED ON SOME MODELS AND OPTIONAL EQUIPMENT
ON OTHER MODELS.
N.G. CONTACTOR CAN BE USED WITH A G1757-3 (OR HIGHER PART NO.) CONTROL
P.C. BOARD.
N.H. WHEN A CONTACTOR IS NOT USED THE "67" LEAD TO THE POLARITY SWITCH
COMES FROM THE CONDUCTOR BLOCK AND THE INPUT CABLE CONNECTS
DIRECTLY TO THE CONDUCTOR BLOCK.
N.J. JUMPER PLUG MUST BE INSTALLED UNLESS OPTIONAL TIMER IS USED.
N.K. R25 WAS 1K ON G1757-3C (OR LOWER PART NO.) P.C. BOARDS.
N.L. TOGGLE SWITCH USED ON EARLIER UNITS.
G-6
5 6 35V
X3 16A
D31
9 8 2 B
X3
Q9
1 20A
R17
500V
11 10
X3 3
100 W
DZ2
1
D6
12 16V
13
15A
X3 1W
600V 2
512
FET DRIVER
5.62K Q6
200mA
Q8
30V
20A
D9
500V
R37 D12 68
3
3A 5W
100
Q7 600V
DZ3
2N4125
16V
1W
2 C26
.1
400V
R44
6.81K
13 X11 14
Aatr1 Vdd
2 1
R46
Aout Ain
3 4
Bout Bin
47.5K
5 11
Bart1 Din
9 10 .1
Cout Dout
6 12
7W
Cart1 Dart1
7 8
Vss Cin
4066B
621
/
6
C
8
D
Y
10
E
12
F
LN-25
OPERATING SCHEMATIC 3-4-94
G
1833
LN-25