Lincoln Electric SVM149-A service manual See the Operation section

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F-6

TROUBLESHOOTING & REPAIR

F-6

Observe Safety Guidelines

TROUBLESHOOTING GUIDE

detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

FUNCTION PROBLEMS

The cutting arc starts but sputters

1. Make sure the operating proce-

1.

Check all connectors and

badly.

dure is correct for the process.

wires for loose or faulty con-

See the Operation section of

nections. See Wiring Diagram.

the manual.

2.

Perform the Torch Continuity

2. Make sure the work clamp is

and Solenoid Test.

connected

tightly

to the work

3.

Perform

the

Main

Inverter

piece.

Board Voltage and Resistance

3. Make sure the torch consum-

Tests.

able parts are in place and in

4.

The control

board

may be

good condition. Replace if

faulty. Replace.

necessary.

4. Make sure the air pressure is

5. Use the correct extension cord.

See the instruction manual.

set at 65psi.

5. Make sure the air supply is not

contaminated with oil or

excessive water.

The pilot arc is normal, but the arc

1. Make

sure

the

operating

1.

Check all connectors and

will not transfer to the work piece.

procedure is correct for the

wires for loose or faulty con-

process.

See

the Operation

nections. See Wiring Diagram.

section of the manual.

2.

Perform

the

Main

Inverter

2. Make sure the work clamp is

Board Voltage and Resistance

connected tightly to the work

Tests.

piece.

3.

The control

board

may be

3. The work piece must be electri-

faulty. Replace.

cally

conductive material, and

the work clamp must make a

good electrical connection with

the work piece.

4. Do not use a drag cup. Not

recommended for Pro-Cut 25

use.

Trigger or purge is activated brief

1.

The Control Board is defective.

air flow then the safety light illumi-

Replace.

nates.

Poor performance of pilot arc or

1. Check pressure switch to be

1.

Try increasing or decreasing the

cutting. Poor consumable life.

functioning

correctly

air pressure to see if conditions

(opening/closing)

at its correct

improve.

pressure.

2. Replace

regulator or

pressure

2. Check pressure gauge to be

switch may be required.

correct in its reading.

3. Screen in air line at inlet to air

3. Check for recommended flow

solenoid

may be

clogged.

rate coming from the torch end

Clean. (no screen before 7/1/02)

with a flow meter.

4. Ensure that air is clean and dry

External filters may be used.

PRO-CUT 25