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F-6

F-6

 

TROUBLESHOOTING & REPAIR

 

 

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

 

 

detailed in the beginning of this manual.

OUTPUT PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

 

 

 

 

 

 

 

OUTPUT PROBLEMS

 

 

The Multi-Source has only

1.

Remove all external welding

1.

Check all heavy current carry-

momentary output after the input

 

cables from the Multi-Source

 

ing leads within the Multi-

contactor activates. Output

 

machine. If the open circuit

 

Source for possible “shorting”

returns momentarily approximately

 

voltage (75-80VDC) is present

 

conditions. See the Wiring

every 75 seconds.

 

and constant at the output ter-

 

Diagram.

 

 

minals there may be a short

2.

Perform the SCR Rectifier

 

 

circuit external to the Multi-

 

 

 

Bridge Test.

 

 

Source. Check the welding

 

 

 

 

 

 

 

cables and the Multi-Weld

3.

Perform the Control Board

 

 

machines.

 

Test.

 

2. If the problem is not resolved

 

 

 

 

with the welding cables

 

 

 

 

removed, there is a fault within

 

 

 

 

the Multi-Source machine.

 

 

 

 

 

 

 

The Multi-Source has momentary

1.

Check the three phase input

1.

Check the output filter circuit.

output only. The green light is

 

voltage. Make certain it is not

 

(resistor R9, capacitor C3, and

OFF and the input contactor

 

too high for the machine’s rat-

 

leads 222C, 292, 294B. See

opens.

 

ing and the reconnect panel

 

the Wiring Diagram.

 

 

configuration.

2.

Check the voltage feedback

 

 

 

 

 

 

 

leads 215B and 222A for loose

 

 

 

 

or faulty connections. See the

 

 

 

 

Wiring Diagram.

 

 

 

3.

Perform the SCR Rectifier

 

 

 

 

Bridge Test.

 

 

 

4.

Perform the Control Board

 

 

 

 

Test.

 

 

 

 

 

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 1- 800-833-9353.

MULTI-SOURCE

Page 34
Image 34
Lincoln Electric SVM155-A service manual Circuit external to the Multi

SVM155-A specifications

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