Lincoln Electric IM762-C manual Output Problems, Contact your local Lincoln

E-4

TROUBLESHOOTING

E-4

Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

POSSIBLE

RECOMMENDED

(SYMPTOMS)

CAUSE

COURSE OF ACTION

OUTPUT PROBLEMS

Major physical or electrical damage

1. Contact your local authorized

is evident when the sheet metal

Lincoln Electric Field Service

covers are removed.

facility for technical assistance.

Input fuses keep blowing, or input

1. Make certain that fuses or

breaker keeps tripping.

breakers are properly sized.

See Installation section of this

manual for recommended

fuse and breaker sizes.

2. Welding procedure is drawing

too much output current, or

duty cycle is too high .

Reduce output current, duty

cycle, or both.

3. There is internal damage to

the power source. Contact an

authorized Lincoln Electric

Service facility.

Machine will not power up (no

1. Make certain that the Power

lights, no fan, etc.)

Switch (SW1) is in the “ON”

position.

2. Circuit breaker CB4 (in recon-

nect area) may have opened.

If all recommended possible areas

Reset. Also, check input volt-

of misadjustments have been

age selection, below.

checked and the problem persists,

3. Input voltage selection made

contact your local Lincoln

improperly .

Power down,

Authorized Field Service Facility.

check input voltage reconnect

according to

diagram on

reconnect cover.

Thermal LED is lit.

1. Fan thermostat has opened.

Check for proper fan opera-

tion. (Fan should run whenev-

er output power is on.) Check

for material blocking intake or

exhaust louvers, or for exces-

sive dirt clogging cooling chan-

nels in machine.

2. Secondary rectifier or Choke

thermostat has opened. After

machine has cooled, reduce

load, duty cycle, or both .

Check for material blocking

intake or exhaust louvers.

3. DC Bus PC board thermostat

has opened check for exces-

sive load on 40VDC supply.