Lincoln Electric NA-5N Service Manual page 78

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The set speed and actual speed
meter readings do not match within a
few IPM. One or both readings may
be erratic.
The set speed is adjustable and
steady. The actual speed is uncon-
trollable. The meter displays the
actual speed correctly.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric
Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
FUNCTION PROBLEMS
1. Contact your local Lincoln
Authorized Field Service Facility.
1. Contact your local Lincoln
Authorized Field Service Facility.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. Check the lead and switch conti-
nuity of the SET speedmeter cir-
cuit. See wiring diagram.
2. Check the lead and switch conti-
nuity of the ACTUAL speedmeter
circuit. See wiring diagram.
3. Perform the Wire Speed
Accuracy Test
4. Perform the Meter Circuit
Accuracy Test.
5. The control board may be fault
1. While the motor is running care-
fully unplug the 15 pin molex from
the control board.
A. If the motor continues to
run the power board may
be faulty. Replace.
B. If the motor stops the
control board may be
faulty. Replace.
2. Perform the Wire Drive Motor
Test.
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