Troubleshooting & repair, Meter circuit accuracy test – Lincoln Electric NA-5S User Manual

Page 123

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F-70

TROUBLESHOOTING & REPAIR

F-70

14. Test Speedmeter PC Board

Accuracy

• Use a test meter with at least 3-

1/2 digits and +/- 0.5% accuracy.

• Connect the + probe to lead #519

(Jumper lead) and the - probe to
lead #510P. Do not

discon-

nect plug.

Note: The coating will have to be
removed from the test points to ensure
accurate meter readings.

• With the NA-5 speedmeter read-

ing SET values of STRIKE speed ,
adjust the strike wire speed con-
trol until the NA-5 speedmeter
matches the settings in the table
below.

• If the test meter does not match

the readings, the speedmeter PC
board may be faulty.

15. When the testing is complete close

and secure the access door.

METER CIRCUIT ACCURACY TEST

(Continued)

NA-5

SPEEDMETER

NA-5 SET SPEED READING

TEST VOLTMETER

CALIBRATION PIN

(IPM)

READING

21*

2.07*

6.00 +/- .06

57F

778

6.00 +/- .06

57

762

6.00 +/- .06

95

428

6.00 +/- .06

95S

456

6.00 +/- .06

142

289

6.00 +/- .06

142T

300

6.00 +/- .06

* For Hi-Speed NA-5 speedmeter (IPM X 1000)

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