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

Models: SVM145-B

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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

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