Low weld output and low auxiliary output, Troubleshooting & repair, Caution – Lincoln Electric POWER-ARC 4000 SVM103-A User Manual
Page 47
TROUBLESHOOTING & REPAIR
POWER-ARC 4000
F-6
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
OUTPUT PROBLEMS
Low weld output and low auxiliary
output.
1. The generator brushes may be
worn. See the Maintenance
section of this manual or contact
your local Lincoln Electric
Authorized Field Service Facility.
2. The engine RPM may be low.
1. Perform the Rotor Voltage Test.
2. If the rotor voltage is low, the
field capacitor (C1) or bridge
(D1) may be faulty. Test or
replace.
3. Check the rheostat (R1). Normal
resistance is 3.3 ohm. See the
Rheostat Replacement drawing.
4. The rotor may be faulty. Per-
form the Rotor Resistance Test.
5. The engine RPM may be low.
Perform the Engine Throttle
Adjustment Test.
6. If engine idle RPM is okay, the
engine may have lost horsepow-
er and be in need of major
repair.