Kemppi DC 3500W - Manual (Page 18)

18 / 1916110E / 9901
English
kuvat 53 - 54
4. COOLING UNIT
(only Mastertig AC/DC 2500W, -3500W)
Filling in the liquid and checking the liquid level is done
by pulling open the hatch in the lower part of the ma-
chine so that you can see the filling hole for the liquid.
The cooling units tank is filled with 20 – 40 % glycol /
water mixture according to antifreeze requirements.
Instead of glycol / water mixture you can also use an-
other liquid according to your experience.
The circulation of the liquid is operation-controlled,
which means that the liquid is circulating only during
welding and for a while after the welding.
5. INTERNAL PROTECTIONS OF
THE MACHINE
5.1 Overheating protection
The yellow signal light of the overheating
protection comes on and the machine
stops when the machine has overheated. The machine
may overheat if the machine is loaded for a long time
with a current higher than 100 % of the duty cycle or
when the circulation of the cooling air is prevented.
5.2 Over-voltage protection of the mains
supply voltage
If the over-voltages in the mains supply are
so high that they can endanger the ma-
chine, the supply of the machine is imme-
diately turned off. If the over-voltages are short in du-
ration, this may be seen as short breaks in the current.
The signal light of the panel showing an over / under-
voltage comes on during a long period of over-voltage.
5.3 The wrong voltage selection
Mastertig ACDC 2500, Mastertig ACDC 2500W
If a multi-voltage machine is connected
to the wrong voltage, the machine will not
start and the signal light in the front pan-
el comes on to indicate this. The machine
will not be damaged if it is connected to
the wrong voltage for a short time. Unplug the machine
from the mains supply and select the correct voltage
from the switch under the front panel.
5.4 Protection of a water-cooled torch
Mastertig ACDC 2500W and -3500W
If the switch of the cooling unit is in the position for an
gas-cooled torch and you start welding with a water-
cooled torch and a current is over 60 A, the welding is
broken.
6. MAINTENANCE
The amount of use and an unusual working environ-
ment have a special effect on the need for maintenance.
Proper use and preventive maintenance will help to
ensure trouble-free operation of the machine without
unexpected interruptions.
6.1 The welding torch
Due to high temperatures and wear, the welding end
of the TIG torch requires maintenance most, but also
the condition of the other parts should be checked reg-
ularly.
The welding end
Check that...
– all insulations of the welding end are undamaged
and in place.
– the gas nozzle is undamaged and suitable for the
work.
– the flow of the shielding gas is free and even.
– the electrode is undamaged. Use an electrode size
and tip sharpening which are suitable for the weld-
ing job. Sharpen the electrode lengthwise.
– the fastening parts of the electrode are undamaged
and that the electrode is tightly fastened in its place.
The torch cable
Check that...
– the insulation of the handle and the torch cable is
undamaged.
– the torch cable has not sharp bends.
Always replace any damaged parts immediately!
Follow the instructions of the torch manufacturer in all
maintenance and repair measures.
Pe no
pressure
overheated
liquid
gas- / water-cooled
torch GAS / WATER
test run of the circulation
of the liquid TEST