Lincoln Electric SVM162-B 21TROUBLESHOOTING & REPAIRF-21, Ammeter Calibration Procedure

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F-21TROUBLESHOOTING & REPAIRF-21

METER CALIBRATION ADJUSTMENTS (continued)

FIGURE F.2 - CONTROL BOARD TRIMMERS

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R10
	62 21 5D 2Z R C D
2X		Q14
		R60
		R61
C28		C29
C44		C30
R91		R93
C45		R94
R120		C46
R121
R92
D41
R119		31
DZ6		X
R161
R162
C70		C71
		D62
		R202
4 3		R4
63R 42R 42Q
		R244
		C102
OCI6	7	R269
	09 62R D
R-5		862 27D 37 R D
703R 803R 9 31C	041C
R351		90R3 9D7 08D
X X	X X

C3
R27
	R28	R29
	R11
		C13
	D6
		Q8
	D7
	R62	R63
		C31
		R64
	01X	R65
		C47
		R95
		R96
		D30
	C55	R126
R122		C56
	R123
		R125
	R124
		R167
	R163
		R168
	R164
	C72	R169
	R203	C73
	R165
		D64
	R166
		R204
	D63
C85		C87
C86		C88
C103		C104
	5R	R245
		R270
		R271
XXX		R272
		R273
OCI7		C119
		R311
XXX
		D81
0 2		D82
1R3 4C1	C141
X X		R7

R12

C4

C5

D2

R33

73R 83R

1R

DZ24

D10

R2

R34

X3

93R

C61 71C

R40

C19

R30

Q9

C18

R41

R31

R35

R73

D11

C20

R32

C14

C15

X4

R36

R77

R66

7X

R74

D22

R68

C34

DZ4

R78

D19

R69

DZ25

DZ22

C35

R72

R67

R70

R75

D23

C32

R71

D20

D21

R76

Q16

D24

C48

R101

D31

C36

D34

R99

33C

Q17

R97

R102

R100

R359

R98

R103

Q18

11

Q21

C63

R104

R130

X

R132

C64

R127

R129

C58

R131

R133

X

X

D42

R3

75C

Q20

C60

C62

R134

Q19

C59

C61

R361

X

X

R175

R128

C76

C74

D54

DZ21

X

X

1 2

4X1

51X

C75

71R 71R

C92

D59

R205

X

X

R173

R176

D58

X

X

R170

R211

R358

X

X

R174

R208

D55

R212

X

X

6X1

D89

C165

JX

X

6 7

C91

C89

C90

2

02R

02R

R209

C93

X

X

X

X

R210

Q23

X

X

R357

C105

D65

6

6

1Y

52R

R246

DZ9

X X X X

C106

R252

Q26

Q25

53R

R247

R248

DZ10

R251

C108

C109

D67

R254

C110

R249

C123

C107

R255

R291

C127

R275

C120

C125

R253

21

R292

R6

R276

C126

R293

R277

54C1 91R3 32ZD 22C1 741C 18R2

28R2 38R2 42C1

ZD

R842 R582 826R R782 882R R928 DZ11 R052

R092

R336

R278

C151

R274

R279

R312

91X

R315

1

0

DZ17

C144

R316

21C 82R

R313

C157

R317

02R3 22R3 52R3 51ZD 64C1

82Q 3 2R3

42R3 84C1

62R3 72R3 82R3 92R3 03R3 13R3 23R3 43R3 33R3

9C41

C150

61 73 25 81 9 35 ZD R3 C1 ZD 1DZ C1

R314

R318

C156

C143

R321

R335

D83

X

X

X X

X X

X X

X X

X

X

C158

R-2

R42

R79

R107

R80

R81

R82

R105

R106

C49

R135

R136

C77

7X1

R257

R258

R259

Q27

CRRR 821 492 592 692

C D1RR 2Z53333 1C 0489 55

R352

R353

	J5A	J6		J7		J8	J9	J10	C159
X X	X X	X X	X	X	X	X	X X X X X X	X X X X X X

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AMMETER CALIBRATION PROCEDURE

1. Locate the Ammeter Calibration Trimmer (R5). See Figure F.1.

2. Set to TIG mode with DC polarity and LOCAL con- trol. Without closing the arc start switch, preset the maximum output panel control so the panel digital meter reads approx. 200 amps.

3. Using a DC (AVG.) test ammeter with at least 1% accuracy at up to 300 amps, connect it to measure the DC current through a short weld cable shorting out the work(+) to electrode(-) studs on the front stud panel. Remove the TIG torch if connected.

4. Close the arc start switch just long enough to com- pare the panel meter reading to that of the test ammeter. The short circuit current readings should match within 4% +/-2A. If not, adjust the trimmer so that the panel meter accuracy is corrected.

VOLTMETER CALIBRATION PROCEDURE 1. Locate the Voltmeter Calibration Trimmer (R2) on

the control board. See Figure F1.

2. To prevent maximum OCV output, disconnect the SCR gate lead plug from receptacle J4.

3. Set to TIG mode with DC- polarity without closing the arc start switch.

4. Using a DC (avg.) test voltmeter with at least 1% accuracy at up to 100 volts, connect it across the work (+) and electrode (-) studs on the front stud panel. Remove the TIG torch, if connected.

5. Press the display panel switch to V (volts) position, then close the arc start switch just long enough to compare the panel meter reading to that of the test volt meter. The open circuit voltage readings (about 50 VDC) should match within 3% +/-1v. If not, adjust the trimmer so that the panel meter accuracy is cor- rected.

NOTE: If the Arc Start switch is held closed longer than about 15 seconds, the machine will shut down to protect internal holding resistor from over- heating.

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PRECISION TIG 275