Maintenance And Checks; Troubleshooting Guide - Elettro MIG 140 Manuel D'instructions

6 MAINTENANCE AND CHECKS

6.1 GENERAL NOTES
• Turn off the welding machine and unplug the power cord
from the socket before each checking and maintenance
operation.
• Moving parts can cause serious lesions
• Keep away from moving parts.
• INCANDESCENT SURFACES can cause serious burns.
• Let the unit cool before servicing.
• Periodically remove any dust or foreign matter that may
have deposited on the transformer or diodes; to do so, use
a jet of clean, dry air.
• When replacing the wire roller, make sure the groove is
aligned with the wire and corresponds to the diameter of
the wire used.
• Always keep the interior of the gas nozzle clean to avoid
metal bridges created by welding dross between the gas
nozzle and the contact tip. Make sure the outlet hole of the
contact tip has not expanded excessively; if so, replace.
• Strictly avoid striking the torch or allowing it to suffer
violent impact.
6.2 REPAIRING THE WELDING MACHINE
Experience has shown that many accidents are caused by
repairs performed incorrectly. That is why it is just as
important to check a repaired welding machine carefully
and completely as it is for a new welding machine.
In addition, this protects the manufacturer from being held
liable for defects when the true fault lies elsewhere.
6.2.1 Instructions for performing repairs
• After rewinding the transformer or inductance, the welding
machine must pass the applied voltage tests as indicated in
table 2 of paragraph 6.1.3 of the standard EN 60974.1 (CEI
26.13). Compliance must be verified as specified in 6.1.3.
• If no rewinding has been done, a welding machine that
has been cleaned and/or revised must pass an applied
voltage test with test voltage values equal to 50% of the
values given in table 2 of paragraph 6.1.3. Compliance
must be verified as specified in 6.1.3.
• After rewinding and/or replacing parts, the no-load voltage
must not exceed the values given in paragraph 10.1 of EN
60974.1.
• If the repairs have not been performed by the
manufacturer, repaired welding machines in which some
components have been replaced or altered must be
marked in such a way that the person who performed the
repairs is clearly identifiable.
• After making repairs, take care to re-order the wiring so
that there is certain insulation between the primary side
and the secondary side of the machine. Prevent the wires
from coming into contact with moving parts or parts that
heat up during operation. Replace all clamps as on the
original machine to prevent a connection from occurring
between the primary and secondary side if a conductor
accidentally breaks or disconnects.

6.3 TROUBLESHOOTING GUIDE

TROUBLE POSSIBLE CAUSE
Line fuse blown
Burnt out diode or
diodes
Burnt out electronic
board
The welding
Loosened torch or
machine
earth connections
supplies limited
or any other
current
electrical power
connections
Voltage adjustment
switch has a loose
contact
Improper
adjustment of
Welding with a
lot of metal welding parameters
spatter
Insufficient
grounding
Drive roll with a too
large groove
Obstructed or
No wire feed or clogged liner
irregular wire Wire holding roller
feed not completely
tightened
Clogged contact
tip
Contact tip with
The wire jams or
wrong diameter
entangles
between the Misalignment of the
drive rolls and drive roll groove
the torch in feed
Obstructed or
wire guide
clogged liner
Insufficient
shielding gas
Excess oxidation of
the edges to be
Porosity in the
welded
welding seam
Gas nozzle partially
or completely
clogged by spatter
9
SOLUTION
Replace line fuse
Replace
Replace
Tighten all
connections
Replace the switch
Select the correct
parameters through
the welding voltage
switches and the
wire-speed
adjustment through
the potentiometer
Check grounding
connections
Replace the drive
roll
Remove and clean
Tighten all the way
Replace
Replace
Realign
Remove and clean
Increase gas
delivery
Thoroughly clean
the edges with a
metal brush
Remove and clean
or replace being
careful not to clog
the gas outlets