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F-6

 

 

 

 

 

F-6

 

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

 

 

 

 

The machine has welding output

1.

If a remote control unit is NOT

1.

If the machine operates normal-

 

 

but no control of output. The auxil-

 

connected to

the

machine,

 

ly in the “LOCAL” position but

 

 

iary power is normal.

 

make sure

the

LOCAL/

 

not in the “remote” position, per-

 

 

 

REMOTE switch is in the

 

form the RF Bypass Board

 

 

 

“LOCAL” position.

 

 

Resistance Test.

 

 

2.

If a remote control unit IS con-

2.

Check the Remote/Local switch

 

 

 

nected and the machine oper-

 

and associated wiring. See the

 

 

 

ates normally when the switch is

 

Wiring Diagram. (leads #75,

 

 

 

in the “Local” position, the

 

#76 and #77)

 

 

 

remote control cable or unit may

3.

Perform the Power Module

 

 

 

be faulty. Check or replace.

 

 

 

 

Test.

 

 

 

 

 

 

 

 

 

 

 

 

 

4. Perform the Control Input Test.

 

 

 

 

 

 

5. Perform the Feedback Input

 

 

 

 

 

 

 

Test.

 

 

 

 

 

 

6. Perform the PWM Output Test.

 

 

 

 

 

 

7. The Control Board may be faulty.

 

 

 

 

 

 

 

The machine has low welding out-

1. Check the brushes for wear and

1.

If the engine high idle speed is

 

put and low auxiliary output.

 

proper contact to the slip rings.

 

low, perform the Throttle Ad-

 

 

2. The engine RPM may be low.

 

justment Test.

 

 

 

 

 

 

 

 

 

 

 

2. Perform the Rotor Resistance

 

 

 

 

 

 

 

Test.

 

 

 

 

 

 

3. Perform the Rotor Voltage

 

 

 

 

 

 

 

Test. If the rotor voltage is low,

 

 

 

 

 

 

 

the field capacitor or field bridge

 

 

 

 

 

 

 

may be faulty. Test and replace

 

 

 

 

 

 

 

if necessary. See the Wiring

 

 

 

 

 

 

 

Diagram.

 

 

 

 

 

 

4. If the engine high idle RPM is

 

 

 

 

 

 

 

OK, then the engine may have

 

 

 

 

 

 

 

lost horsepower and be in need

 

 

 

 

 

 

 

of major repair.

 

 

 

 

 

 

 

 

 

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

Page 62
Image 62
Lincoln Electric SVM145-B service manual Form the RF Bypass Board