Lincoln Electric CV450-T Manuel D'utilisation page 10

7. Low current delivery and low
open circuit voltage
8. Faulty welding results (porosity,
spray, etc......)
9. Drive roll does not turn
although arc voltage is present
and solenoïd is on
10. Voltage adjust not functioning
on the machine
11. Wire feed speed adjust not
functioning on the machine
12. The wire is not fed
13. Machine has no output
.
14. Thermal protection indicator
is on.
15. Machine does not have
maximum output.
16. Machine will not shut off.
17. Variable or sluggish welding
arc.
18. Variable or sluggish welding arc
3. Torch button does not work
4. Damaged rectifier of generator
5. Faulty auxiliary transformer
1. Monophase working
2. Low line voltage
1. Faulty gas circuit
2. Bad quality of wire or gas used
3. The work piece to weld are dirty
4. The earth is badly connected
5. Wrong adjustments of welding
voltage and wire speed
6. The torch is faulty
1. Defective wire feed motor
1. Arc voltage commutator
1. Wire feed speed potentiometer
1. The motor is damaged
2. The feed rolls are worn out
3. The contact tip is worn out
1. Work lead loose or broken
2. 4 A or 10 A fuse, inside the
machine blown out
3. Defective PC board
1. Protection thermostat has open.
.
1 Faulty P.C Board.
1. Defective power switch
1. Poor work connection.
2. Welding lead size too small
3. Arc voltage too low.
4. Defective SCR bridge
5. Wrong size, worn and/or melted
contact tip.
1 Poor work connection.
9
3. Check if the torch button
closecircuit, if it does not, replace it.
4. Replace it
5. Replace it
1. Check the line fuse
2. Check the input voltage
1. Check if the bottle tap is open. Free
the gas guide nozzle possible
obstructions.
2. change the wire or gas quality
3. Clean the work piece
4. Check the earth clamp and see ifthe
cable is whole and well closed
5. Increase or decrease the
parameters so as to find the right
adjustment
6. Check the torch components and, if
necessary, replace the faulty parts
1. Replace wire feed motor.
1. Replace it.
1. Replace it
1. Check and if necessary replace it
2. Replace it
3. c Replace it
1. Repair connection
2. Check current and replace if every
thing normal.
3. See wire feeder operating manual.
1. Allow the machine to cool. Be sure
to provide adequate ventilation for
machine. Do not exceed current and
duty cycle rating of gun.
1. See wire feeder operating manual.
1. Replace.
1. Check and clean connection.
2. Check table in this manual.
3. Set the arc voltage at the right
value
4. Check and replace if defective.
5. Replace.
1. Work connection must be