Lincoln Electric SVM112-B service manual Schematic Control PC Board #3, 2E Current Mode Control

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G-6	ELECTRICAL DIAGRAMS	G-6
SCHEMATIC - CONTROL PC BOARD #3

3-2241

G

+5V

+5V

+15V

+15V

+5V

+5V

2E: CURRENT MODE CONTROL

+5V

+5V

14

14

18

4

13

Vdd

C152

4

4

C96

20

20

20

0.1

C81

0.1

X56

267

C151

X92

50V

0.1

O/D(0:15)

C132

C97

X63

C98

X64

C150

C100

C101

50V

C148

C83

C84

47

X54

0.1

X71

X61

50V

2R

0.1

0.1

0.1

0.1

0.1

0.1

0.1

X90

0.1

X68

0.1

X55

50V

C153

50V

50V

54HC4066

50V

54HC4066

50V

50V

50V

C87

50V

50V

50V

MC1408

AD7545

33074A

0.1

74AC573

33074A

33074A

0.1

74AC573

74HC573

+2.5V

50V

7

7

AGND

DGND

11

50V

3

20

+

2

3

A

11

11

O/D(8)

2

D0

Vcc

1

C133

A

10

10

10

O/D(9)

3

D1

O7

12

8

X91

+5V

A

0.1

X90

50V

A

A

A

D

1

13

REF

TL431

/OE

O6

-5V

O/D(10)

4

17

6

-

-15V

D2

O2

D

100K

O/D(11)

5

16

A

77

-15V

D3

O3

6

D4

O4

15

2R

-5V

R288

7

14

221K

D5

O5

33.2K

8

D6

01

18

12

200

825

1

V+

/Q OUT

8

2H: REFERENCE VOLTAGES

9

19

R278

D7

00

14

2

7

DSP2_W0

X61

R282

R283

+IN

Q OUT

OVR_CUR

10

GND

LE

11

X93

(DSP2, PORT2)

13

3

-IN

GND

6

74AC573

C137

C138

10.0

4

V-

LE

5

D

820p

820p

R316

1

20

LT1016

OUT1

RFB

50V

50V

R281

1

/OE

Vcc

20

2

AGND

VREF

19

A

A

6.81K

C95

5

-5V

O/D(0)

2

11

3

18

D0

LE

DGND

Vdd

0.1

13

X68

R

1.00K

O/D(1)

3

D1

O0

19

15

DB0

X54

/WR

17

A

50V

R170

R172

O/D(2)

4

D2

O1

18

14

DB1

/CS

16

CLR_SHUNT

CURRENT MODE CONTROL, DISABLE THE

+2.5V

10K

10K

1.00K

O/D(3)

5

D3

O2

17

13

DB2

DB8

7

(DSP2)

FETS AS SOON AS SECONDARY CURRENT

IS GREATER THAN A REFERENCE LEVEL

86

O/D(4)

6

16

12

6

10

1R

D4

O3

DB3

DB9

R284

200

825

R169

2

Q14

O/D(5)

7

D5

O4

15

11

DB4

DB10

5

8

10K

X61

R286

R287

10K

X71

1

R167

2N4403

10

4

O/D(6)

8

D6

O5

14

DB5

DB11

9

475

9

8

C139

C140

3

O/D(7)

9

D7

O6

13

DB6

DB7

AD7545

820p

820p

10

GND

O7

12

50V

50V

A

6

10.0

R285

74AC573

6

1

6.81K

R

O/D(0:15)

A

(DSP2 DATA BUS)

GENERATE A REFERENCE LEVEL

C57

+2.5V

-15V

+15V

1.00K

6.81K

22p

R314

5

R275

R276

100V

Q9

4.75K

7

R128

C134

C135

C136

1.00K

6

X71

2N4401

CURRENT A/D

Q33

475

820p

8

9

R280

X21

CLR_SHUNT

50V

330p

150p

FILTER INCOMING

2N4401

1.00K

REFERENCE

100V

50V

(DSP2)

SECONDARY CURRENT

72

97

10K

1R

313

10.0

+Vref_I

CLEARING NETWORK

A

2R

33.2K

R

SHUNT CONNECTION

+15V

+15V

SECONDARY CURRENT REGULATION

R129

CURRENT SIGNAL IN

10mA = 800A OUTPUT

A

10.0

2

1

1.00K

1

1

3

031 R

33.2K

3R

3R

1

R155

I_AD

C79

3

CURRENT FEEDBACK

X61

3R

26.7K

CLR_CAP

2

150

(2) TO CURRENT A/D

0.1

CLEARING NETWORK

D10

A

50V

J21

651 R

K00 .1

203 R

K57 .4

(SHEET 2, X39)

4.75K

1N914

A

8

R299

Q13

R154

V_LIMIT

+Vref_I

+15V

150

Q12

R66

600mA

1A

10.0

40V

D52

47.5K

C88

100V

1N4936

4.75K

C54

9

C85

R126

R310

10

CURRENT FEEDBACK

R153

241

820p

41R

750

CURRENT FEEDBACK

(HC11 ADDR/DATA BUS)

22p

681

4.75K

X71

8

R122

Q8

VOLTAGE A/D

0.27

R

50V

1N914

DA-AD[0:7]

100V

+Vref_I

2N4401

INTERGATOR

50V

AMPLIFIER

-5V

9

475

REFERENCE

DZ27

D11

12

A8

COMP

16

K00 .1

003 R

251 R

GAIN = 5.0 to 6.9

1.00K

15V

DA-AD[0]

2

D7

Q7

19

11

A7

Io

4

Q10

CW

I_AD = 5.0V @ 800A OUTPUT

R97

R96

811 R

10.0

1W

051 R

74HC573

3

Vee

Vref+

TRIM_DAC REFERENCE

903 R

+Vref_V

600mA

500

DA-AD[1]

3

D6

Q6

18

14

R171

R98

1.00K

1.50K

K00.1

40V

DA-AD[2]

4

D5

Q5

17

10

A6

X56

Vcc

13

2

VOLTAGE FEEDBACK

*

33.2K

1.00K

1.50K

1.00K

DA-AD[3]

5

D4

Q4

16

9

A5

Vref-

15

R94

1.00K

C73

X26

1

R120

R121

X55

0.1

DA-AD[4]

6

D3

Q3

15

8

A4

R CON

1

3

10.0

803 R

1.00K

A

2C: SECONDARY CURRENT SENSE

2D: CURRENT FEEDBACK

DA-AD[5]

7

14

7

2

50V

703 R

D2

Q2

A3

GND

DA-AD[6]

8

D1

Q1

13

6

A2

MC1408

A1

5

A

C77

DA-AD[7]

9

12

D0

Q0

A

0.1

1.00K

J20

50V

3

R188

+_OUTPUT

WR_REF

11

LE

A

J20

1.00K

-_OUTPUT

DA-AD[0:7]

1

OE

2G: PROGRAMMABLE VREF

(SHEET 1, X5)

2

R187

67A

J20

1.00K

1

R189

67B

D

6

J20

R186

1.00K

21A

7

J20

R191

1.00K

21B

CLAMP CIRCUIT FOR

KELVIN VOLTAGE

X63

TRANSIENTS ABOVE 5.0V

3 POLE FILTER

J21

SUPPLY RAIL

R271

FEEDBACK SWITCH

1

2

FIRST STAGE CUTOFF FREQ = 4.8 KHZ

2

-15V

+5V

+15V

V_LIMIT

MATRIX

13

AS1

SECOND STAGE CUTOFF FREQ = 3.3 KHZ

J21

100

THIRD STAGE CUTOFF FREQ = 3.4 KHZ

R270

3

+15V

X63

100

1.00K

103

VOLTAGE IDEALLY

8

9

ALL GROUNDS MEET

DZ34

DZ35

26.7

EQUAL TO 10/210,

15V

2

10K

R

15V

80V=3.81V

6

AS2

PRECISION

HERE AND ONLY HERE

1W

81R

1W

R185

X64

RECTIFIER

1.00K

C105

GAIN = 2

J21

R289

3

10K

10K

3

11

10

2.21K

6

CONNECTED IN

81R

0.1

1

12

Q15

50V

3.32K

X92

R291

R293

R295

R297

13

GRAPHICS ONLY

D15

12

22.1K

X71

R184

2N4403

AS3

2

332

14

V_LIMIT

J21

1N914

14

X64

C141

C142

C143

X92

V_AD

475

0.1

.022

.0047

327

13

1N914

1N914

UNITY GAIN

4

12

503

10.0

D13

D14

4

3

50V

50V

50V

DIFFERENTIAL AMPLIFIER

D12

475

+15V

R303

R

1N914

D

A

NOISE_GROUND

771

R

5

AS4

6.81K

J21

I_AD

R

60

10.0

*

*

X64

A

33.2K

*

100K

100K

7

3

R

4

J20

8

9

R174

R175

R99

NOISE_GROUND

NOISE_GROUND

6

AS5

5

9

V_AD

J20

R290

2.21K

10K

5.11K

33.2K

*

100K

*

X92

R178

X63

8

3.32K

7

R292

R294

R296

R298

R181

R141

8

150

(TO VOLTAGE A/D)

-15V

X92

10

4

3

6

332

C144

C145

C146

2I: V LIMIT

5

AS6

0.1

.022

.0047

*

-15V

X63

50V

50V

50V

475

741

641

475

100K

841

D16

R304

1N914

11

10

6.81K

R

R

R

J20

12

AS7

A

5

X64

UNITY GAIN

NOISE_GROUND

1

2

AMPLIFIER

NOTES :

K

K

K

K

K

K

13

AS8

A

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

0

0

0

0

0

0

2F: VOLTAGE FEEDBACK

DZ18

0.1

DZ19

0.1

DZ20

0.1

DZ21

0.1

0.1

DZ22

0.1

(

)

CONTROLED BY

WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY

NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE

SHEET 1, X16

531 R

19R

29R

39R

09R

98R

NUMBER.

5.1V

5.1V

5.1V

5.1V

5.1V

1W

1W

1W

1W

1W

GENERAL INFORMATION

LAST NO. USED

ELECTRICAL SYMBOLS PER E1537

R-

345

DZ- 35

C-

156

Q-

34

CAPACITORS =

MFD ( .022/50V

UNLESS OTHERWISE SPECIFIED)

A

LABELS

D-

52

X-

93

RESISTORS = Ohms (

1/4W

UNLESS OTHERWISE SPECIFIED)

DIODES =

1A, 400V

(UNLESS OTHERWISE SPECIFIED)

SUPPLY

VOLTAGE NET

ANALOG CIRCUITRY - SHEET 3

3Ef: MULTIPLEXING THE V

INPUTSARC

POWER SUPPLY SOURCE POINT

COMMON CONNECTION

FRAME CONNECTION

FILE: G2241_2A1

EARTH GROUND CONNECTION

UNLESS OTHERWISE SPECIFIED TOLERANCE

Ch’ge.Sht.No.

8-13-99B

THE LINCOLN ELECTRIC CO.

EQUIP.

POWER WAVE

TYPE

ON HOLES SIZES PER E-2056

1-6-95B

CLEVELAND, OHIO U.S.A.

CONTROL SCHEMATIC

ON 2 PLACE DECIMALS IS + .O2

SUBJECT

ON 3 PLACE DECIMALS IS + .OO2

4-21-95J

SCALE

NONE

ON ALL ANGLES IS + .5 OF A DEGREE

NO.SHT.

G 2241-3

MATERIAL TOLERANCE ("t") TO AGREE

8-11-95C

DR.

JRF

DATE

11-25-92

CHK.

SUP’S’D’G.

WITH PUBLISHED STANDARDS

1-30-98B

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

POWER WAVE 450