Troubleshooting & repair, Caution – Lincoln Electric NA-5S User Manual
Page 78
F-25
TROUBLESHOOTING & REPAIR
F-25
NA-5
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
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.
1. Contact your local Lincoln
Authorized Field Service Facility.
1. Contact your local Lincoln
Authorized Field Service Facility.
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
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.