Migatronic PI 250 Manuel D'instructions page 8

Important!
In order to avoid damage to plugs
and cables, good electric contact is
required when connecting the work
return cable and welding torch to
the machine.
Connection of welding cables
The electrode holder and return current cable are
connected to plus tap (3) and minus tap (4). Observe
the instructions from the electrode supplier when
selecting polarity.
Please note that the plug must be turned 45 degrees
after insertion into the socket - otherwise the plug can
be damaged due to excessive contact resistance.
Connection of remote control (PI 250)
Remote control is connected to the 7-poled plug (5).
Connection of remote control (PI 350/500)
PI 350/500 machines equipped with 8-pole control
interface (5) can be controlled via a remote control or
a welding robot. The remote control socket has
terminals for the following functions:
A: Input signal for welding current, 0 -
+10V input impedance: 1Mohm
B: Signal ground
C: Arc detect – contact of relay (max.
1Amp), fully insulated
D: N.C.
E: Arc detect – contact of relay (max. 1Amp), fully
insulated
F: N.C.
G: Supply +24VDC. Short circuit protected with PTC
resistor (max. 50mA).
H: Supply ground
Usage of the machine
When welding, a heating of various components of the
machine takes place and during breaks these
components will cool down again. It must be ensured
that the flow is not reduced or stopped.
When the machine is set for higher welding currents,
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 in
the meantime. If the periods for cooling down during
use of the machine are not sufficiently long, the over-
heating protection will automatically stop the welding
process and the yellow LED in the front panel will
come on. The yellow LED switches off when the
machine has cooled down sufficiently and is ready for
welding.
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