Migatronic PI 320 AC/DC Manuel D'instruction page 19

Connection of welding cables
Connect the welding cables and the return current
cable to the front of the machine.
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.
Always connect the TIG torch in the minus (-) socket
(5) and the return current cable in the plus (+) socket
(6).
The control signals from the TIG torch are transmitted
to the machine through the circular 7-pin plug (7).
When the plug has been assembled please secure it
by turning the "circulator" clockwise. Connect the gas
hose to the quick connection.
COATED ELECTRODES: Electrodes are marked with
a polarity on the packing. Connect the electrode
holder in accordance with this marking to the plus or
minus sockets of the machine.
Connection of TIG torch
Mount the flow hose on the water cooled torch in the
quick connection marked with blue (8) and the return
hose in the quick connection marked with red (9).
Control of cooling liquid
The machine is delivered with integrated water cooling
and the cooling liquid level should be checked
regularly by means of the level control (10). The
refilling of cooling liquid takes place through the filler
neck (11).
Connection of electrode holder for MMA
The electrode holder and return current cable are
connected to plus tap (6) and minus tap (5). Observe
the instructions from the electrode supplier when
selecting polarity.
Connection of foot control
Foot control is connected to the 7-poled plug (7) or
through the 8-poled plug (12) (depending on the foot
control type).
Connection of remote control
PI machines equipped with 8-pole control interface
(12) 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
CWF Multi (option)
It is possible to connect to the PI with up to 8 CWF
Multi units via dedicated CAN BUS connector (13)
placed on the rear side of machine (option). In order to
permit this control capability, enter the USER Menu
and select "Fdr" (feeder), then access "Act" (Active
devices) and set the parameter to 1 (see USER
MENU).
Now the PI is ready to control the CWF directly from
the box: for each TIG welding program it is possible to
select what CWF unit must be activated and the
relative CWF program in the range 1 to 20.
Depending from the settings on the CWF, if the unit is
in OFF mode the error message "Fdr" can be
displayed on PI and the welding procediment stopped.
This is to inform the user the CWF is not responding to
start signal from PI.
Usage of the machine
When welding, a heating of various components of the
machine takes place and during breaks these compo-
nents 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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