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2.2.8. Adjustment of tightness of reel brake (Promig 501, 501L and 530)
Brake force is adjusted through hole in locking device of reel hub by screwing the control screw
(41) with screwdriver.
Adjust brake force as so big that the wire is not allowed to become too loose on the reel so that
it would spill from the reel when the rotation of the reel stops. Need for brake force is increased
with increase of wire feed speed.
Since the brake loads for its part the motor, you shouldn't keep it unnecessarily tight.
2.2.9. Burn back time
Electronics of feed unit controls stopping of welding automatically so that the wire end doesn't
melt fastened to the contact tip or the work piece. Automatics work regardless of the wire
feed speed.
2.2.10. Ground cable
Fasten earthing press of ground cable carefully, preferably direct to welding piece. Contact
surface of press always should be as large as possible. Clean the fastening surface from paint
and rust!
Use in your MIG equipment 70 mm
connectors and insulations.
Make sure that the welding gun in your use is designed for max. welding current needed by
you!
Never use a damaged welding gun!
2.3.
SHIELD GAS
Handle gas bottle with care. There is a risk for injury if gas bottle or bottle valve
is damaged!
For welding steels, mixed gases are normally used. Check that the regulator is suitable for the
gas. The fl ow rate is set according to the welding power used in the job. A suitable fl ow rate is
normally 8 - 10 l/min. If the gas fl ow is not suitable, the welded joint will be sporous. Contact
your local Kemppi-dealer for choosing gas and equipment.
2.3.1. Installing gas bottle
Always fasten gas bottle properly in vertical position in a special holder on the
wall or on a carriage. Remember to close gas bottle valve after having fi nished
welding.
12 – Promig 100/0601
41
2
. Thinner cross-sectional areas might cause overheating of
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