Lincoln Electric SVM145-B service manual Troubleshooting Guide, Output Problems

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-4

F-4

TROUBLESHOOTING & REPAIR

Observe Safety Guidelines

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

OUTPUT PROBLEMS

Major physical or electrical damage

1.

Contact your

local

Lincoln

1. Contact the Lincoln Electric

is evident.

Authorized Field Service Facility.

Service Department at 1-800-

833-9353 (WELD).

No welding output in neither Stick

1. Place

the

Welding Terminals

1. Check for loose or faulty connec-

or CV modes. The engine operates

Switch in the “ALWAYS ON”

tions on the heavy current carry-

normally. The auxiliary output is

position.

If the problem is

ing leads between the output,

normal.

solved, the fault may be in the

the power modules, the choke

external control cable (if used),

and the output terminals.

leads #2 and #4. See the Wiring

2.

Check

the

Welding

Terminals

Diagram.

Switch

and

associated

leads.

2. With

the engine at high idle

See the Wiring Diagram.

(1900 RPM), the machine in the

3.

If the

correct OCV

is present

Stick

mode

and

the OUTPUT

when

the

Welding

Terminals

CONTROL at maximum, check

Switch is in the “ALWAYS ON”

for the presence of approximate-

position, perform the RF Bypass

ly 87VDC (open circuit voltage at

Board

Resistance

Test.

Also

the output terminals.

check

associated

wiring.

See

3.

If the correct OCV is present at

the Wiring Diagram.

the welding output terminals,

4. Check the Remote/Local switch

check

the

welding

cables,

and associated wiring. See the

clamps and electrode holder for

Wiring Diagram. (leads #75, #76

loose or faulty connections.

and #77)

4.

Make

sure

that

the

5.

Perform the Stator Voltage

LOCAL/REMOTE switch is in the

Test.

correct position.

6. Perform the Output Rectifier

Bridge Test.

7. Perform the Power Module

Test.

8. Perform the Control Trans-

former Test.

9. Perform the Power Supply

Test.

10. Perform the Control Input Test.

11. Perform the Feedback Input

Test.

12. Perform the PWM Output Test.

13. Perform the Current Balance

Test (codes 10469 & 10470).

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-800-833-9353.

COMMANDER 300