Lincoln Electric SVM145-B service manual Schematic Control PC Board, Current Tail OUT

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G-4	ELECTRICAL DIAGRAMS	G-4
SCHEMATIC - CONTROL PC BOARD

+12V

A	90.9K		P5	11
		R151	-D

P4 1 P3 4

-A-B

P2	8
-C

P1	11
-D

CURRENT TAIL OUT

10

8

+12V

+12V

X13	-C		X13	12
CC
9	8	R154	22.1K
6				10
		43.2K

X14	13	X14	5
	2		3

X14	6
	9

X14

10

12

C33

X2 -C

9

R21

R22	16.5K
C31

	14	14
12
14	X18	X14
X5
13

14	14		14	4	14		15	4		4		14	C26
													0.1	4	4
													50V
				X9			X1	X2	X5		X19
X13	X12	X10				X8
																X11

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R152

4093B X4

+12V

CV

X13

-B

90.9K

R157

3

4

CURRENT SET POINT CIRCUITRY

5

R1

J3

100

R75

D12

5

77

8

R8

56

R5

7

-B

C10

PIPE

X13

-A

X2

100

+ t

C45

TP-A

475

6

2

1

C

C8

2.7

0.1

50V

R6

13

50V

GND

D13

475

GND

10

10K

10K

10K

10.0K

J3

76

R2

R3

R79

8

R225

16

X5

C7

DZ8

9

TP-C

R7

R9

681K

C41

10K

1.8

8.2V

0.1

10K

C9

R4

20V

1W

50V

0.1

D14

X12

TO CONTROL POT

50V

GND

GND

CC

-C

9

8

GND

GND

R74

J3

100

12

6

R78

75

7

R76

56

R11

14

-D

X2

0.1

12.1K

+ t

13

R160	56.2K
	28.0K	R161
	10.0K	R162
		56.2K
	R226
+12V

11

X12

26.7K R163

C100

1.0

35V

GND

20.0K R164

2700p475K

50V

R16 100

SET PT. BUFFER

10

8

X9 -C

9

TP-H

R106 22.1K

R17

DZ6	C16 22.1K
10V	0.1

1W 50V

GND

5

6X19 -A

267

R198 2

R23 6.19K

GND

GND

4

13

1

X18 -A

	54HC4066		54HC4066
GND		7		7
			C74
			0.1
			50V

	MIN CURRENT		X10	-D
		R109
10.0K			11
		3.01K
R110	R108			12

54HC4066

54HC4066

54HC4066

33074A

54HC4066

MC33023

33074A

33074A

LT1014

7

7

7

11

7

10

11

11

7

33074A

C79

C78

C77

C70

C59

C52

C27

11

11

0.1

0.1

0.1

C28

C29

C96

0.1

0.1

0.1

0.1

C81

50V

50V

50V

0.1

0.1

0.1

C62

50V

50V

50V

50V

0.1

C82

50V

50V

50V

0.1

50V

0.1

50V

50V

GND

setpoint

12

ERROR AMP

X9

14

Vref

POW_+12

-Vss

-D

PWM

13

TP-I

R235

10

25A

R13

C11

1

INV

X1

Vref

16

R88

200

J3

221K

2

NON INV

Vcc

15

4.75K

R15

R18

3

COMP

OUT

14

25

10

22.1K

22.1K

R72

13

C54

4

CLOCK

PWR Vcc

13

J3

X10

-C

.47

1 C15

200

50V

5

Rt

PWR Gnd

12

1.0

100	DZ3	100		50V		R155
	10V							R158
C46				C50			4.75K
	5W				CV
2.7		R12				X12 -B
50V	TP-B	475	GND		3	4
						5

GND

BR165

100K

GND	X12 -A
PIPE	1
2

12

10

STARTING ENHANCEMENT

10.0K R221

C95

18

15V

GND

267K

AVE. CURRENT BUFFER

510.0K

X9 -B 7 R137

6

			221K	Q2	R143
					221K
		2	X9 -A	1A
				100V	0.1
			1
		3	DZ4	GND	50V
					C73
1.00K	R224		15V	GND
			1W
					GND
				GND

R105

R19

TO DRIVER BOARD

1

2

Ct

Ilim ref

2

35V

8.25K

22.1K

4.75K

6

11

12

23

R14

R73

13

C39

7

RAMP

GND

10

200

J3

820p

2

C12

8

SOFT START

Ilim

9

50V

X19 -B

3

.018

MC33023

R233

11

23A

1

50V

200

J3

0.1

C14

50V

1.0

C48

C13

35V

GND

GND

GND

GND

+12V

13

R132

P5

X10

-B

X18	-B
+12V

R166

R159

ABSOLUTE CURRENT

221K

C76

3.32K

R153

R156

4.75K

GND

68.1K

R96

LIMIT 550A

0.1

50V

3.92K

3

TP-M

1N4936

GND

GND

X2 -A

1

C51

R97

2

D38

56.2K

0.1

50V

R95

D

100K

C99

GND

.0047

50V

12

TP-D

R102

R103

R258

20.0K

7.68K

DZ9

X11

-D

14

12V

15.0K

1W

R104

2.43K

13

R144

C55

20.0K

1.8

R220 221K

GND

R130 61.9K

GND

R128 39.2K

GND

R126

26.7K

4

R140

221K

P4

8

R131

221K

P3

11

R129 221K

P2

8

R127

3

5

X10 -A

9

6

X8 -D

10

12

X8 -C

9

6

DZ13

10V

1W

C98

GND +12V

R249	100K
	R250
	1.00K

				+12V
24.3K	R251		1.00K	R213	R214	2.00K
					2N4403
					Q3
				R212	1.00K
					TAIL OUT MAGNITUDE
		R107	4.75K
		Q5
		2N4401		R210	R211	28.0K
			20.0K

4

3

R87

+12V

1.50K

5

475

0.1

50V

POW_gnd

C104

POW_gnd

R177

R174

R173

R176

4.75K

20.0K

52.3K

GND

IMBALANCE DETECTOR

2

GND

C84

10

3

R256

R167

3

69

SCR1

0.1

8

1

4.75K

100K

J3

800mA

50V

X11 -A

X11 -C

2

200V

D69

9

1

6

3

X11 -B

GND

R257

R168

4

68

3

7

4.75K

100K

J3

TP-P

5

4.75K

D59

R175

R243

R172

DZ11

C93

1N4936

R170

R178

10V

0.1

33.2K

10.0K

10.0K

100K

1W

50V

R259

R169

4.75K

10.0K

D60

R171

DZ10

10V

1N4936

100K

1W

	OUTPUT VOLTAGE			20V	VOLTAGE FEEDBACK BUFFER
	FEEDBACK
					GND
67	J3
		R29
	2					+12V
		61.9K	D62
							1N4936
			1N4007
							D9
						R183	AVE. CURRENT LIMIT
					68.1K		400A
	R180	R181	5				3

GND	221K
	P1
R141		4
20.0K

GND		R125
		221K
	R26
		1
	2.43K		CV

X8 -B

3

5

X8 -A

2

13

Q4

2N4401

R248 100K

	9	11	GND
6	C-	D-	8
	X18
		X18	12 10 X19 -C
GND			9
	8	10

X19 -D 12

11

13

	C103
	0.1
GND	50V
		+12V				GND
	D48					R187	6	90
		R252
	GND		47.5K			475	J1
	D49			5	1	OCI1
			C102
	Q6					CNY17-3
			2.7

			47.5K		1.00K	7				X5	1
						X5					TP-E
						6			2
					C4
					1.8				R184	R185
					20V
									1.00K	33.2K
					GND
			R94				C30	R186	31.6K
			1.00K				0.1
					2		50V
101	J2	CURRENT	R227				GND				10K
	1			1	X4 -A				GND
			1.00K		3						R40
							C44

	277	J3			100K
				R215	100K
		5
50K	PINCH/ARC FORCE POT		C105		R216
		J3	0.1		GND
	278	14	50V

GND

GND

	D50				50V
					4	6	2
			R260
	D51	100K		2N4401
				R253	100K			R196	3	91
D57						R92	267K	475	J1
R69
10.0K	D52
				GND
					GND
D56

21		J3
	15	R36

CURRENT AMP

820p

50V

GND

D70

R139	CC
	10
J4	220
475	PIPE 5
PIPE 5

+	10.0	10.0	10.0	10.0	1.30K
SHUNT INPUT	C2
	0.27

5

X4 -B

7

TP-F

R142	6
J4	215
475

50mv=400AMPS 50V R32 R33 R34 R35

6

R118
10K	D46

Vref

10

TP-G

PIPE4	PIPE4
R68	2
J4	216
475

-J3

22 6

A

	1.00K	R230
		1.00K
102	J2	77
	7

GND

BC

1.00K

R228

R231

R37 1.30K

D

R229 1.00K

R38

102K

C32

2700p

50V

R47 475

	R39	R41
	221K	1.00K
	C36
D67	1.0	+12V
	35V

GND	R42
GND	20.0K

C37

TP-N

13

X4 -D 14

12

SENSE CURRENT

R44 22.1K

R43 162

GND

X4-C

9

8

D66

R219

20.0K

GND

D41

R179

2.43K 1N4936

D61

GND

					R67		PIPE3		PIPE3
								J4	5
					475				217
				R66			PIPE2		PIPE2	5	4
								J4	7
				475					218
										6	3
							PIPE 1		PIPE 1
			R65
								J4	8
			475						219
										7
									CV MIG			2
		R64						J4	9
D54		475							214
	R63								CV INN	8	1
								J4	4			CC
D55	475					C67			213
		C63		C65			C72
						0.1
		0.1		0.1			0.1		+15V
						50V
		50V		50V			50V		1		+12V
					C66	C68		J4	222
			C64				C80
					0.1	0.1
			0.1				0.1
					50V	50V
			50V				50V
											R99	1.00K

103	J2	75
	8
104	J2	76			Vin
	6
105	J2	VOLTAGE
	5		+12V
	J2		109	D1	D2
106
	3		4	J3
			J1
			12	1
107	J2		108	J3
	2		1
		J1	11	9
				D3	D4
		GND			TP-J

R200

56

+t

R77

56

+ t	4.75K	R205
	4.75K	R206
	4.75K	R207
C25	4.75K	R208
1200
100V
-Vss	DZ12
		5.1V
		1W

R241

1.00K

D30	+12V
	POW_+12
Q1	TP-K
1	3

2C1

					150
			C42		15V
				R51
	+	1	0.1		10K
	X7		50V
			8
DZ1	TL431		REF
	-	6
15V
5W			R20		TP-L
			2.61K
			+12V SUPPLY
			FOR CONTROL CIRCUIT		POW_gnd
					GND

D68

110

2

J1

NOTES :

N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE

WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE NUMBER.

D39

GND

C53

0.1

50V GND

GENERAL INFORMATION					LAST NO. USED
ELECTRICAL SYMBOLS PER E1537					R-	260	Q- 6	SCR- 1
CAPACITORS =	MFD ( .022/50V		UNLESS OTHERWISE SPECIFIED)	LABELS	C-	105	X- 19	OCI- 1
RESISTORS = Ohms (		1/4W	UNLESS OTHERWISE SPECIFIED)		D-	70	DZ- 13
DIODES = 1A, 400V		(UNLESS OTHERWISE SPECIFIED)		SUPPLY		VOLTAGE NET
J2=8 PINS				POWER SUPPLY SOURCE POINT
J3=16 PINS
J4=10 PINS				COMMON CONNECTION
				FRAME CONNECTION
FILENAME:	G3001_1B1			EARTH GROUND CONNECTION
								8-14-98A
							G 3001

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.

COMMANDER 300