Lincoln Electric INVERTEC 270SX Service Manual page 22

!! WARNING !!
PROBLEMS / SYMPTOMS
A VISUAL DAMAGE IS EVIDENT
WHEN YOU OPEN THE COVER
MACHINE IS DEAD, NO LED, NO FAN
THE GREEN POWER ON LED ON THE
FRONT PANEL IS BLINKING ALL THE
TIME
THE MACHINE REGULARLY
OVERHEATS AND THE YELLOW
THERMAL LIGHT IS ON INDICATING A
THERMAL OVERLOAD
THE MAIN INPUT FUSES OR
BREAKERS REPEATEDLY FAIL
POOR STICK ELECTRODE WELDING
PERFORMANCE
THE MACHINE HAS OUTPUT
CURRENT BUT IT IS NOT
ADJUSTABLE
UNABLE TO CHANGE WELDING
MODES
TROUBLESHOOTING
BEFORE CONNECT POWER SUPPLY, MAKE A CAREFUL VISUAL INSPECTION
INSIDE THE MACHINE , CHECK ALL THE BOARDS AND HARNESS.
-------------------------------------------
•
MAKE SURE THAT THE INPUT LINE
IS PRESENT
•
CHECK THE INPUT SWITCH
•
THE INPUT VOLTAGE MUST
MATCH THE RATING PLATE
•
PERFORM THE INPUT BOARD
TESTS
•
AN INPUT VOLTAGE OVER RANGE
IS PRESENT
•
INTERNAL AUXILIARY
UNDERVOLTAGE CONDITION
•
THE WELDING APPLICATION MAY
BE EXCEEDING THE
RECOMMENDED DUTY CYCLE OF
THE 270SX OR 400SX
•
DIRT AND DUST MAY HAVE
CLOGGED THE COOLING
CHANNELS INSIDE THE MACHINE
•
THE AIR INTAKE AND EXHAUST
LOUVERS MAY BE BLOCKED DUE
TO INADEQUATE CLEARANCE
AROUND THE MACHINE
•
MAKE CERTAIN THE FAN AS
NEEDED (F.A.N.) CIRCUIT IS
OPERATING PROPERLY. THE FAN
SHOULD OPERATE ALL THE TIME
DURING WELDING AND / OR
WHEN THERE IS AN OVER
TEMPERATURE CONDITION. IF
THE MACHINE DOESN'T WELD FOR
MORE THAN FIVE MINUTES, THE
FAN WILL TURN OFF
•
MAKE CERTAIN THE FUSES OR
BREAKERS ARE PROPERLY SIZED
FOR THE INPUT DRAW OF THE
MACHINE
•
MAKE SURE THE ARC FORCE
CONTROL, IF USING THE MACHINE
IN USER MODE, IS SET PROPERLY
FOR THE PROCESS
•
CHECK FOR LOOSE OR FAULTY
WELDING CABLES
•
IS THE ELECTRODE DRY? TRY
WELDING WITH ANOTHER
ELECTRODE FROM A DIFFERENT
BOX. MAKE SURE YOU HAVE THE
CORRECT ELECTRODE FOR THE
APPLICATION
•
CHECK THE INPUT VOLTAGE,
MUST MATCH THE RATING PLATE
•
CHECK THE CURRENT
POTENTIOMETER
•
THE WELDING MODE PUSH
BUTTON IS DEFECT
Page22
CHECKS RECOMMENDED COURSE
OF ACTION
•
CHANGE THE PART BROKEN AND
PERFORM THE TESTS FOR THE
OTHER PARTS
•
CONNECT THE INPUT LINE
•
REPLACE THE IF NECESSARY
•
REPLACE THE INPUT BOARD IF
NECESSARY
•
CHECK THE INPUT VOLTAGE
•
TURN OFF AND ON AGAIN THA
MACHINE TO RESET THE ERROR
CONDITION
•
PERFORM THE INPUT BOARD TEST
•
CHECK AND RESPECT THE
RECOMMENDED DUTY CYCLE
•
CLEAN WITH LOW PRESSURE DRY
AIR THE COOLING CHANNEL INSIDE
THE MACHINE
•
MAKE SURE TO HAVE ADEQUATE
CLEARANCE AROUND THE
MACHINE
•
ONE OF THE THERMOSTATS MAY
BE FAULTY.ONE NORMALLY
CLOSED THERMOSTAT IS LOCATED
ON THE INVERTER HEAT SINK AND
ANOTHER IS ON THE OUTPUT
BOARD HEAT SINK. SEE THE
WIRING DIAGRAM.
•
PERFORM THE INPUT RECTIFIER
TEST
•
PERFORM THE INVERTER TEST
•
CHECK THE ARC FORCE SETTING
•
REPLACE THE FAULTY WELDING
CABLES
•
PERFORM THE OUTPUT BOARD
TEST
•
REPLACE THE CONTROL BOARD
•
PERFORM THE INVERTER BOARD
TEST
•
REPLACE THE CONTROL BOARD