Kemppi DC 2000 - Manual (Page 22)

– Mastertig aC/DC 000, 500, 500W, 3500W/0701 © keMppi oy
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4. cooling unit
(only Mastertig ac/Dc 2500W, -3500W)
no pressure
overheated liquid
gas- / water-cooled torch GAS / WATER
test run of the circulation of the liquid TEST
Filling in the liquid and checking the liquid level is done by pulling open the hatch in the lower
part of the machine 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 another 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
machine, the supply of the machine is immediately turned off. If the over-voltages
are short in duration, 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 panel 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.