Lincoln Electric NA-5SF, NA-5NF Voltmeter Accuracy Test, Figure F.7 Test Meter Connection Points

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F-58 TROUBLESHOOTING & REPAIR F-58

VOLTMETER ACCURACY TEST (Continued)

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TEST PROCEDURE

Perform the following checks with the NA-5 connected to a Lincoln CV weld- ing power source according to the prop- er connection diagram. See the Installation Section of this manual.

1.Connect the test voltmeter (see Materials Needed) between the "work" and the electrode cable con- nection at the welding head. See Figure F.7

2.Using the 5/16" nutdriver open the control box PC board access door.

3.Place a jumper wire between leads #2 and #4 located on CR3 relay. See Figure F.8 This this should energize the output terminals of the Lincoln CV welding power source. An open circuit voltage should be present at the welding output termi- nals. The test voltmeter reading should match the ACTUAL volts meter reading on the NA-5 within +/- 0.5VDC (typically +/- 0.2VDC). If it does not, check the integrity and placement of the voltage sensing leads #21 and #67 and associated wiring. Perform the Meter Circuit Accuracy Test.

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ELECTRODE CABLES

CONNECT VOLTMETER

TO ELECTRODE

CONNECTION

POINT

FIGURE F.7 TEST METER CONNECTION POINTS

NA-5