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WELDERS ITEM 8201N ÷ 8214N
EDITION: MAY 2008 PAGE 23 OF 32
7.3.1 LOWERING OF THE WELDING UNIT PERFORMANCES
Extraordinary maintenance must be carried out only by specialised personnel
equipped with the proper instruments and trained to accomplish it under safety
conditions. When possible, the welder must be disconnected from both pneumatic
and electric supply.
If performances are lower than expected, check:
•
That, during welding, line voltage drop is lower than 15%.
•
That the supply cables section is adequate.
•
That the electrodes diameter is appropriate for the work to be carried out.
•
That cooling water circulates in the required quantity.
•
That welding pressure shown by the pressure gauge is adequate for the work in process.
•
That the pressure gauges works properly.
7.3.2 TROUBLESHOOTING
Troubleshooting must be carried out only by specialised personnel equipped with
the proper instruments and trained to accomplish it under safety conditions. When
possible, disconnect both electric and pneumatic supply.
In case of a wrong operating welder, use the following table for find out both fault cause and
remedy.
FAULT
CAUSE
REMEDY
The control unit does not
switch
on.
Control
unit
led
ON keeps off.
Either connectors or cables
disconnected.
Check.
Fuses FU1-FU2 blown.
Replace them.
Control unit fuse blown.
Replace it (see control unit use
manual)
The control unit does not
switch on. Control unit led
ON is on.
Inadequate mains voltage
Check.
Faulty control unit.
Replace it.
When operating the welding
units blocks the cycle and the
head rises up.
Excessive voltage drop.
Check that voltage drop is lower
than 25%. On the contrary,
check that supply cables section
is adequate to their length.
The welder carries out the
welding cycle without current
circulation.
Control
unit
CURRENT
led
,
if
present, is off during the
WELD/NO WELD function
set
to NO WELD. Led
off.
Set to WELD. Led
lights.
welding cycle.
Faulty control unit.
Replace it.
