Lincoln Electric SVM123-A service manual Operating Schematic

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G-3	ELECTRICAL DIAGRAMS	G-3
Operating Schematic

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2147 G

L3

L2

L1

CURRENT REED SW.

CLOSED WITH OUTPUT CURRENT

73

74R1

76

77

TS 3

5J11

CC1J1

3CR CVI

215CVS S4-B 215

CCS4-A

CVI

6J2

CVS7J2 8J1

	10J1
	11J1
	8J2
S3
CC
CVI	3J1
CVS	1J2
	S4-C

CC4J2

CVI

CVS

S4-B

			255
	START		STOP
				271
	211	212	2CR
	H3			R3
	1CR
H2	120VAC			1CR	R
H1	256			257
	T2		SECONDARY PRIMARY

	14J1	13J1	5J2
220
221	256	255	215	+55V
STARTING LOGIC
	POWER SUPPLY			+16V

	- 6.2V
	- 10V
SET POINT
229
73	CONTROL PCB
74
75
226
	FAULT DETECT.
238
230
266	CONTROL AMP
	231
VOLTAGE FEEDBACK
224

222

SHUTDOWN

		235
CURRENT FEEDBACK		OVERLOAD DETECT.
		236
210	215

222

216

S2

1CR

1CR

21

1

2

203

4

TO GROUND

4CR

4

5

2

7

8

31

31

10

204

11

TI

32

FAN MOTOR

120VAC

TS 2

F1

32A

8A

SCR1

SCR2

1J5

214 FIRING BD. ENABLE

5J5

215

6J5

215

204

4J5

2J6

X

SCR1 & SCR2

GATE DRIVE

3J4

2J5

FIRING CIRCUIT

G1

203

75 VAC

1J7

A

231

8J7

A'

G2

GATE DRIVE

6J4

206

3J5

1J6

SCR3 & SCR4

7J5

75 VAC

Y

205

FIRING CIRCUIT

G3

GATE DRIVE

1J4

2J7

B

231

GATE DRIVE

5J7

B'

G4

4J4

9J1 FIRING SIGNAL

10J5

8J5

231

3J6

Z

208

6J7

GATE DRIVE

9J5

75 VAC

C

G5

5J4

207

5J7

C' SCR5 & SCR6

GATE DRIVE

FIRING CIRCUIT

G6

2J4

235

12J1

7J1

2CR

FIRING PCB

236

1CR

3

205

6

9

206 12

SCR3

SCR4

31

32A

207

208

214	4CR	R2		OUTPUT
		216		SNUBBER
				PCB
		4CR
SCR5		4CR		OUTPUT
		215		SHUNT
SCR6			215	210

50mV @ 1300Amps

222

"-"OUTPUT STUD

500 AMP OUTPUT

OUTPUT CHOKE

"+" OUTPUT STUD 210

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2J11 1J3 2J3

THIS SHEET CONTAINS PROPRIETARY INFORMATIONUNLESS OTHERWISE SPECIFIED

TOLERANCE

E Q U I P .

TRANSFORMER WELDERS

OWNED BYTHE LINCOLN ELECTRIC ANDCO . IS

ON HOLE SIZES PER E2056

4-27-90

THE LINCOLN ELECTRICTCOY P E

.

ON 2 PLACE DECIMALS IS

. 02

2

-19-93L

CLEVELAND, OHIO U . S . A .

NOT TO BE REPRODUCED, DISCLOSED OR USED

OPERATING SCHEMATIC

WITHOUT THE EXPRESS PERMISSION OF

ON 3 PLACE DECIMALS IS

. 002

S U B J E

CT

ON ALL ANGLES IS . 5 OF A DEGREE3

-19-93D

S C A L E NONE

S H T .

MATERIAL TOLERANCEt (" ") TO AGREE

THE LINCOLN ELECTRIC CO .

WITH PUBLISHED STANDARDS .

D R

C.S.

D A T E 7-31-92

C H K J.J.

R E F

.

S U P ' S ' D ' G3-1-90

N O . G 2147

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

IDEALARC DC1000