Migatronic OMEGA 2 CoWelder 300 Guide De L'utilisateur page 10

Connection and start-up
Connection of shielding gas
Connect the gas hose, which branches off from the
back panel of the welding machine (3), to a gas supply
with pressure regulator (2-6 bar). (Note: Some types of
pressure regulators require an output pressure of more
than 2 bar to function optimally).
One gas cylinder can be mounted on the bottle carrier on
the back of a trolley if any.
Lifting instructions
The OMEGA trolley with four
2
wheels cannot be lifted with a crane
but only manually using the handle.
The machine must not be lifted with
a mounted gas cylinder!
Adjustment of wire brake
The wire brake must ensure that the wire reel brakes
sufficiently before the welding wire runs over the edge of
the reel. The brake force is dependent on the weight of
the wire reel and wire feed speed. Factory setting is 15kg.
Adjustment:
• Dismount the control
knob by placing a thin
screw driver behind the
knob and thereafter pull
it out.
• Adjust the wire brake by
fastening or loosening
the self-locking nut on
the axle of the wire hub.
• Remount the control knob.
Assembly of parts in wire feed unit
10
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Inching
The function is used for wire inching
e.g. after change of wire.
Selecting welding polarity
Polarity reversal is recommended for certain types of
welding wire, in particular Innershield welding wire. For
recommended polarity, please refer to the welding wire
packaging.
Change of polarity:
1. Disconnect the machine from
the mains supply.
2. Dismount screws in the wire
chamber with a wrench
(picture 1).
3. Exchange brass plate from
plus to minus (picture 1).
4. Mount screws in the wire
chamber with a wrench
(picture 1).
5. Exchange earth cable from
minus to plus (picture 2).
6. Connect the machine to the
mains supply.
1
2
The pressure of the
thumbscrew is adjusted to
allow the wire feed roll
just to slide on the wire
when this is stopped at
the contact tip
x4