Troubleshooting & repair, Warning voltmeter accuracy test (continued) – Lincoln Electric LN-9 SVM127-A User Manual

Page 94

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ELECTRIC SHOCK can kill.

• With power applied, there

are high voltages inside
the wire feeder. Do not
reach into the wire feeder
or touch any internal part
of the wire feeder while
power is applied.

3. With the LN-9 gun trigger closed or the gun

terminals jumpered together (see the Wiring
Diagram), the test meter reading should
match the LN-9 ACTUAL volts reading within
+/- 0.5 volts. If it does not, check the integri-
ty and placement of the voltage sensing leads
#21 and #67. Perform the

Meter Circuit

Accuracy Test.

4. Remove the test voltmeter and, while weld-

ing, compare the SET volts and ACTUAL volts
meter readings. Depending upon the arc volt-
age characteristics of the welding process
being used, the ACTUAL reading may vary
somewhat around an average value. The
average ACTUAL reading should match the
SET reading within +/- 0.5 volts. If not, refer
to the

Meter Circuit Accuracy Test.

5. If no further tests are required, remove the

jumper from the gun terminals (if used) and
close the left case side cover assembly.

TROUBLESHOOTING & REPAIR

F-36

LN-9 Wire Feeder