Tweco 161 S UK - Manual (Page 20)

THERMAL ARC 161 S INSTALLATION
Installation 3-4 3-4 Manual 0-5183
5. Earthing of the Work Piece
Where the work piece is not bonded to earth for
electrical safety, nor connected to earth because
of its size and position, e.g. ship’s hull or building
steelwork, a connection bonding the work piece
to earth may reduce emissions in some, but not
all instances. Care should be taken to prevent the
earthing of the work piece increasing the risk of injury
to users, or damage to other electrical equipment.
Where necessary, the connection of the work piece
to earth should be made by direct connection to
the work piece, but in some countries where direct
connection is not permitted, the bonding should be
achieved by suitable capacitance, selected according
to national regulations.
6. Screening and Shielding
Selective screening and shielding of other cables
and equipment in the surrounding area may alleviate
problems of interference. Screening the entire
welding installation may be considered for special
applications.
3.05 Setup for Welding
NOTE
Conventional operating procedures apply
when using the Welding Power Source, i.e.
connect work lead directly to work piece
and electrode lead is used to hold electrode.
Wide safety margins provided by the design
ensure that the Welding Power Source will
withstand short-term overload without
adverse effects. The welding current range
values should be used as a guide only.
Current delivered to the arc is dependent
on the welding arc voltage, and as welding
arc voltage varies between different classes
of electrodes, welding current at any one
setting would vary according to the type of
electrode in use. The operator should use
the welding current range values as a guide
then fine tune the welding current to suit
the application.
WARNING
Before connecting the work clamp to the
work and inserting the electrode in the
electrode holder make sure the Primary
power supply is switched off.
CAUTION
Remove any packaging material prior to use.
Do not block the air vents at the front or rear
of the Welding Power Source.