Migatronic OMEGA 220 Manuel D'instruction page 20

Adjustment of wire brake
The wire brake must ensure that the wire reel brakes
sufficiently quickly when welding stops. The required
brake force is depending on the weight of the wire reel
and the maximum wire feed speed. A brake torque of
1.5-2.0 Nm will be satisfactory for most applications.
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 knob by pressing it back into the
groove.
Selection of welding polarity
(OMEGA MINI/400/400S)
We recommend that you shift welding polarity for
certain types of welding wire, and this especially as
regards Inner shield welding wire. Please control the
recommended polarity stated on the packing of the
welding wire.
OMEGA MINI
Change of polarity:
1. Disconnect the machine from the mains supply.
2. Use a wrench to dismount the bolts and discs at
the poles.
3. Reverse the cables.
4. Use a wrench to mount the bolts and discs.
5. Connect the machine to the mains supply.
OMEGA 400
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.
OMEGA 400 S
Change of polarity:
1. Disconnect the machine from the mains supply.
2. Exchange intermediary cable from plus to minus
3. Exchange earth cable from minus to plus
4. Connect the machine to the mains supply
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