Tweco 95 S Thermal Arc(Jan2013) - Manual (Page 23)

INSTALLATION THERMAL ARC 95 S
Installation 3-5 Manual 0-5086
5. Earthing of the Work Piece
Where the work piece is not bonded to earth for electri-
cal 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 cur-
rent 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.