Lincoln-electric POWER ARC 5000 User Manual download pdf (Page 42)

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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

(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.

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Lincoln-electric POWER ARC 5000 User Manual Page 42

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