Lincoln Electric POWER ARC 5000 - Manual (Page 42)

E-1 TROUBLESHOOTING E-1
POWER ARC 5000
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 your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
A. No generator power or welding out-
put.
B. Generator power is available but
unit will not weld.
1. Open lead in flashing or field circuit.
2. Open flashing diode (D1)
3. Faulty brushes.
4. Faulty rheostat (R1).
5. Faulty field rectifier (D1).
6. Faulty capacitor (C1).
7. Faulty stator field winding.
8. Faulty rotor.
9. Dirty slip rings
1. Loose connection to output stud.
2. Work not connected.
3. Electrode holder loose.
4. No open circuit voltage at output
studs. Open lead in weld circuit.
5. Faulty reactor (L1).
6. Rheostat (R1) lead broke
1. Refer to wiring diagram.
- check lead 202C (brown) connection
at oil-gard switch in engine block.
- check (green) GNDC lead con-
nected to bearing end bracket.
2. Check continuity in forward direction
202C (brown) and 202B (red)
3. Check continuity and wear of brush.
Replace brush if necessary.
4. Rheostat resistance should be
approximately 3 ohms when current
control dial is set at “70 amps”.
5. Replace field rectifier.
6. Replace capacitor.
7. Disconnect lead 7A (blue) at D1 and
check for continuity between leads
7A and 9A (blue).
8. Remove brushes and check rotor
resistance between slip rings. It
should read approximately 7 ohms.
See “Generator / Welder
Maintenance” section for brush
installation procedure.
9. Clean slip rings with a fine git emery
paper.
1. Check output studs and firmly tight-
en all connections.
2. Clean work clamp area of work to a
shiny metal.
3. Check all electrode holder connec-
tions.
4. Refer to wiring diagram and check
leads W1, W1A, & W2 (black).
5. Check resistance from start to end of
aluminum coil. Replace reactor if
necessary.
6. Refer to wiring diagram.
- check lead 200 (red).
- check lead 202B (red).
- check rheostat tabs.