Migatronic NAVIGATOR 2500 Manuel D'instruction page 15

Diffusion-free gas hoses
This welding machine has been mounted with a PVC
gas hose, which is sufficient for general welding
tasks. We recommend that the machine is equipped
with diffusion-free gas hoses in these special cases
where large demands have been made on gas
purity. Diffusion sealed gas hoses result in less
moisture to the protection gas. These special gas
hoses can be ordered as special equipment and
should be mounted on the supply side out to the
solenoid valve.
Connection of welding cables
Connect the welding cables and the return current
cable to the front of the machine (1 and 2). Please
note that the plug must be turned 45 degrees after
insertion into the socket - otherweise the plug can be
damaged due to excessive contact resistance.
Connect always the TIG connection in the minus (-)
tap (2) and the return current cable in the plus (+) tap
(1).
The control signals from the TIG torch are transformed
to the machine through the circulary 7-poled plug (3).
When the plug has been assembled please secure it
by turning the "circulator" clockwise. Connect the gas
hose to the quick connection (4).
Electrodes are marked with a polarity on the packing.
Mount the electrode tongs in accordance with this
marking to the plus/minus taps of the machine (1 and
2).
Connection of external adjustment (option)
Connect the remote control unit on the rear of the
machine on the circulary 8-poled plug (7).
Control of cooling liquid
If the machine is delivered with an integrated torch
cooling module, it will be necessary to inspect the
cooling liquid level by means of the level control (8).
Refillment of cooling liquid takes place through the
filler neck (9).
Usage of the machine (NAVIGATOR 3000)
When welding, heating of various components of the
machine takes place and during breaks these com-
ponents will cool down again.
It must be ensured that the air intake and outlet are not
blocked.
It is not possible to overload the machine in normal
use, and there is no need for cooling down periods at
current settings up to 190 Amps. When the machine is
set for welding currents higher than these, there will be
a need for periods during which the machine can cool
down.
The length of these periods depends on the current
setting, and the machine should not be switched off
during cooling to avoid stop of the cooling fan. If the
periods for cooling down during use of the machine
are not sufficiently long, the overheating protection will
automatically stop the welding process and the yellow
LED will come on. The yellow LED switches off when
the machine has cooled down sufficiently, and the
machine is ready for welding.
Max. load is:
100 % max. load
60 % max. load
25 % max. load
60 % max. load when MMA welding means that a
cooling period of 4 minutes after welding for 6 minutes
is required at a current setting of 240 A, 10 minutes
between start of each welding period must be cal-
culated in connection with the above table.
15
190 A
240 A
300 A