Tweco 175 TE Arcmaster - Manual (Page 25)

instaLLation arcmaster 175 te
Manual 0-5116 3-3 Installation
3.04 High Frequency Introduction
The importance of correct installation of high frequency
welding equipment cannot be overemphasized.
Interference due to high frequency initiated or
stabilized arc is almost invariably traced to improper
installation. The following information is intended
as a guide for personnel installing high frequency
welding machines.
!
WARNING:
EXPLOSIVE The high frequency section
of this machine has an output similar to
a radio transmitter. The machine should
NOT be used in the vicinity of blasting
operations due to the danger of premature
firing.
!
WARNING:
COMPUTERS It is also possible that
operation close to computer installations
may cause computer malfunction.
3.05 High Frequency Interference
Interference may be transmitted by a high frequency
initiated or stabilized arc welding machine in the
following ways:
1. Direct Radiation: Radiation from the machine
can occur if the case is metal and is not properly
grounded. It can occur through apertures such
as open access panels. The shielding of the high
frequency unit in the Power Source will prevent
direct radiation if the equipment is properly
grounded.
2. Transmission via the Supply Lead: Without
adequate shielding and filtering, high frequency
energy may be fed to the wiring within the
installation (mains) by direct coupling. The
energy is then transmitted by both radiation and
conduction. Adequate shielding and filtering is
provided in the Power Source.
3. Radiation from Welding Leads: Radiated
interference from welding leads, although
pronounced in the vicinity of the leads, diminishes
rapidly with distance. Keeping leads as short as
possible will minimize this type of interference.
Looping and suspending of leads should be
avoided where possible.
4. Re-radiation from Unearthed Metallic Objects:
A major factor contributing to interference is re-
radiation from unearthed metallic objects close
to the welding leads. Effective grounding of such
objects will prevent re-radiation in most cases.
3.06 Electromagnetic Compatibility
!
WARNING
Extra precautions for Electromagnetic
Compatibility may be required when
this Welding Power Source is used in a
domestic situation.
A. Installation and Use - Users Responsibility
The user is responsible for installing and using the
welding equipment according to the manufacturer’s
instructions. If electromagnetic disturbances are
detected then it shall be the responsibility of the user
of the welding equipment to resolve the situation
with the technical assistance of the manufacturer. In
some cases this remedial action may be as simple as
earthing the welding circuit, see NOTE below. In other
cases it could involve constructing an electromagnetic
screen enclosing the Welding Power Source and the
work, complete with associated input filters. In all
cases, electromagnetic disturbances shall be reduced
to the point where they are no longer trouble-some.
NOTE
For 230 VAC operation, have a qualified
person install according to applicable
codes, and instructions.
NOTE
The welding circuit may or may not be
earthed for safety reasons. Changing the
earthing arrangements should only be
authorized by a person who is competent
to assess whether the changes will
increase the risk of injury, e.g. by allowing
parallel welding current return paths which
may damage the earth circuits of other
equipment. Further guidance is given
in IEC 974-13 Arc Welding Equipment -
Installation and use (under preparation).
B. Assessment of Area
Before installing welding equipment, the user shall
make an assessment of potential electromagnetic
problems in the surrounding area. The following shall
be taken into account.