Lincoln Electric 50448 Service Manual page 48

!! WARNING !!
BEFORE CONNECT POWER SUPPLY, MAKE A CAREFUL VISUAL INSPECTION
PROBLEMS / SYMPTOMS
A VISUAL DAMAGE IS EVIDENT
WHEN YOU OPEN THE COVER
NO WIRE FEED AND SOLENOID
NO CONTROL OF WIRE FEED SPEED
THERE IS NO WELDING OUTPUT
WHEN THE GUN TRIGGER IS
PRESSED. THE WIRE FEEDS
NORMALLY AND THE GAS SOLENOID
IS ACTIVATED PROPERLY
THE WELDING VOLTAGE IS NOT
CHANGING WHILE TURNING THE
USER INTERFACE VOLTAGE
ENCODER
WELDING PROCESS DOES NOT
CHANGE WHEN THE LEFT PUSH
BUTTON ON THE UI IS PRESSED
THE FEEDER RESET ITSELF WHEN
THE WELD STARTS
WITH TRIGGER PRESSED THE ROLLS
DO NOT TURN BUT GAS SOLENOID IS
WORKING PROPERLY
NO WIRE FEEDING BUT THE DRIVE
ROLLS ARE TURNING
THE GAS SOLENOID IS NOT
ACTIVATED WHEN TRIGGER IS
PRESSED, BUT ROLLS ARE TURNING
THE COLD INCH/GAS PURGE SWITCH
DOES NOT ENABLE THE WIRE DRIVE
MOTOR BUT WIRE DRIVE MOTOR IS
ACTIVATED WHEN GUN TRIGGER IS
PRESSED
These tests and repair should only be performed by Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger
to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and
precautions detailed throughout this manual.
TROUBLESHOOTING
INSIDE THE MACHINE, CHECK ALL THE BOARDS AND HARNESS.
CHECKS / ERROR DESCRIPTION
-------------------------------------------
MAKE SURE THAT THE LF52D or
•
LF56D RECEIVE THE 40VDC POWER
SUPPLY
THE GUN TRIGGER MAY BE DEFECT
•
THE TACHIMETER MAY BE FAULTY
•
THE USER INTERFACE BOARD MAY
•
BE MAULTY
THE MOTOR BOARD MAY BE FAULTY
•
THE ARC LINK CABLES BETWEEN
•
POWER FEED AND POWER SOURCE
MAY BE DEFECT.
THE MOTOR BOARD MAY BE FAULTY
•
THE POWER SOURCE MAY BE
•
DEFECT
THE USER INTERFACE MAY BE
•
FAULTY
THE MOTOR BOARD MAY BE FAULTY
•
THE POWER SOURCE MAY BE
•
DEFECT
MAY BE A SOFTWARE PROBLEM ON
•
UI IS PRESENT
THE BUTTON IS DEFECT
•
NOISE CAN BE THE CAUSE OF THIS
•
PROBLEM
LOOSE OR FAULTY MOTOR
•
CONNECTION MAY BE PRESENT
THE MOTOR BOARD MAY BE FAULTY
•
(NO POWER TO THE MOTOR)
THE DRIVE ROLLS PRESSURE MAY
•
BE NOT CORRECT
THE DRIVE ROLLS OR WIRE GUIDE
•
MAY BE NOT CORRECTLY
INSTALLED
A MECHANICAL RESCTRICTION MAY
•
BE PRESENT INSIDE THE TORCH
THE SPOOL BRAKE TORQUE MAY BE
•
TOO MUCH
THE GAS SOLENOID MAY BE FAULTY
•
THE MOTOR BOARD MAY BE FAULTY
•
(NO POWER TO THE GAS SOLENOID)
A MECHANICAL DAMAGE ON THE
•
COLD INCH/PURGE SWITCH MAY BE
PRESENT
CHECK FOR LOOSE OR FAULTY
•
LEAD CONNECTIONS BETWEEN THE
COLD INCH/PURGE SWITCH AND
MOTOR BOARD CONNECTOR
RECOMMENDED COURSE
OF ACTION
REPLACE THE BROKEN PART AND
•
PERFORM THE TESTS FOR THE
OTHER MACHINE COMPONENTS
PERFORME THE MOTOR BOARD
•
TEST
CHECK AND REPLACE THE GUN
•
TRIGGER IF NECESSARY
PERFORM THE TACHIMETER TEST
•
REPLACE THE USER ITERFACE
•
PERFORM THE MOTOR BOARD
•
TEST AND REPLACE IF DEFECT
CHECK STATUS LED ON POWER
•
SOURCE FOR COMMUNICATION
ERROR
CHECK THE ARCLINK CABLES FOR
•
GOOD CONTINUITY
REPLACE THE MOTOR BOARD
•
PERFORM THE POWER SOURCE
•
TESTS
REPLACE THE USER INTERFACE
•
REPLACE THE MOTOR BOARD
•
PERFORM THE POWER SOURCE
•
TEST
RE-FLASH FEEDER SOFTWARE
•
REPLACE THE UI BOARD
•
CHECK CAPACITOR C1 FOR GOOD
•
CONNECTIONS TO CONNECTOR X1
PIN E AND FEEDER FRAME (SEE
FEEDER WIRIND DIAGRAM)
CHECK LEADS 288 AND 289
•
CONNECTIONS FROM MOTOR
BOARD CONNECTOR TO MOTOR
CONNECTOR (SEE FEEDERS
WIRING DIAGRAMS)
PERFORM THE MOTOR BOARD
•
TEST
CHECK THE DRIVE ROLLS FOR
•
CORRECT PRESSURE
CHECK THE DRIVE ROLLS AND
•
WIRE GUIDE FOR CORRECT
INSTALLATION
CHECK THE TORCH LINER,
•
REPLACE IF NECESSARY
CHECK THE SPOOL BRAKE
•
TORQUE
PERFORM THE GAS SOLENOID
•
TEST
PERFORM THE MOTOR BOARD
•
TEST
• REPLACE THE COLD INCH/PURGE
SWITCH IF NECESSARY
• IF THERE IN MECHANICAL
PROBLEMS AND ALL CONNECTIONS
ARE OK, THE MOTOR BOARD IS
DEFECT; REPLACE IT.