Lincoln Electric SVM175-A service manual Observe Safety Guidelines, Adjustment Test

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F-8

TROUBLESHOOTING & REPAIR

F-8

TROUBLESHOOTING GUIDE

Observe Safety Guidelines

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

WELD OUTPUT PROBLEMS

The machine welds, but it will not

1. This condition may be normal in

1. The engine may not be main-

maintain a steady output. The arc

the Downhill Pipe Mode.

The

taining correct RPM.

Perform

may suddenly get hotter or colder.

Downhill Pipe Mode allows the

the

Engine

Throttle

arc current to increase and

Adjustment Test.

Make sure

decrease slightly as the arc

the engine has an adequate

length changes.

supply of clean, fresh fuel.

2. Check that the electrode used

Check the fuel and air filters,

is of good quality, dry, and free

2.

replace if necessary.

of contamination.

Try

using

If the engine still fails to main-

some new Lincoln electrode,

tain correct RPM, the engine

and setting the machine per the

will need to be serviced.

Lincolnʼs recommendations for

3. Check the internal cables and

that product.

leads that connect the weld

3. If shielding gas is used, check

winding of the stator, chopper

that the correct gas is being

module, shunt, choke and the

used, and that the gas flow is

output

terminals.

See

the

set correctly.

Check

the gas

wiring

diagram. Look for

any

system for damaged,

pinched

damaged conductors

or faulty

or leaking hoses.

4.

connections.

4. Check for loose or faulty con-

There may be poor connections

nections at the weld output ter-

in the control wiring at the weld

minals and welding cable con-

control PC board or the chopper

nections.

board. Pull each plug from the

5. Check for adequate connection

weld control PC board and thor-

oughly insect the terminals in

between the work cable and the

both the plugs and the PC

work piece.

The

work

cable

board receptacles.

Make sure

should be attached to clean

the connections are clean and

meta, as close to the weld area

that the pins are properly seat-

as practical.

The

weld

clamp

ed in the plastic plug housing.

must be in good condition and

Check for loose or damaged

have adequate spring tension.

pins and faulty crimp connec-

6. The weld cables may be too

5.

tions.

long, and/or too small, causing

Check for damaged wiring and

excessive

voltage

drop

poor connections in leads 13,

between the machine and the

14, 23, and 25 between the

arc.

chopper module and the weld

control PC board.

If for any reason you do not

CAUTION

perform the test/repairs safely,

understand the test procedures or are unable to

contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call

1-888-935-3877.

RANGER 305D