Lincoln Electric SVM188-A service manual Control

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F-4

TROUBLESHOOTING AND REPAIR

F-4

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

(SYMPTOMS)

MISADJUSTMENT(S)

COURSE OF ACTION

OUTPUT PROBLEMS

The Machine is dead - The Input

1.

Check

for blown

or missing

1.

The ON/OFF Switch

(S1) may

contactor does not operate.

fuses in input lines.

be faulty

2. Check the three phase input line

2.

The

Control Transformer

(T2)

voltage

at the

machine. The

may

be faulty.

Perform

the

input voltage must match the

Control Transformer Test.

rating

plate

and

reconnect

panel.

3.

The primary or secondary ther-

mostats may be open. Check or

replace. Also check the associ-

ated wiring. See the Wiring

Diagram.

4.

The pilot relay (CR2) may be

faulty. Check or replace.

5.

The input contactor coil may be

open.

6.

The Control Board may be

faulty. Perform

the

Control

Board Test.

Input contactor (CR1) chatters.

1.

The input line voltage may be

1.

The pilot relay (CR2) may have

low. Check all three phases.

bad contacts. Check or replace

relay.

2. Make sure input line voltage

2.

Check for loose or faulty wiring

matches machine rating and the

reconnect panel is

connected

between pilot relay (CR2) and

correctly for the line voltage

input contactor (CR1) coil con-

nections.See Wiring Diagram.

3.

The input contactor (CR1) may

be faulty.-Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

DC-600