Publicité
RECOMMENDATION TO REDUCE ELECTRO-MAGNETIC EMISSIONS
General
The user is responsible for installing and using the arc welding equipment according to the manufacturer's instructions. If
electromagnetic disturbances are detected, then it shall be the responsibility of the user of the arc welding equipment to
resolve the situation with the technical assistance of the manufacturer.
Evaluation of the welding area
Before installing arc welding equipment the user shall make an assessment of potential electromagnetic problems in the
surrounding area
a.
Other wiring, control cables, tephones and communication cables; above, below and adjacent to the welding
machine
b.
Radio and television transmitters and receivers;
c.
Computer and other control equipment;
d.
Equipment critical for safety purposes such as safety checks of industrial equipment;
e.
The health of persons in the vincity, for example persons who wear pacemakers and hearing aids;
f.
Equipment used for calibration or measurements;
g.
The immunity of other equipment in which the equipment is to be used. The user must ensure that other
equipment used in the same placet is compatible. This may require additional protection measures;
h.
The time of day when welding or other activities are carried out
i.
The size of the area to be considered will depend on the structure of the building and any other processes in the
area. The surrounding area may extend beyond the boundaries of the buildings.
Recommendation to reduce electro-magnetic emission
Mains power supply: the equipment must be connected to the power mains as specified in the Manufacturer's
a.
instructions. If interference occurs, additional precautions suchas filtering of the mains supply may be required.
The supply cable in the welding machine's permanent installations may have to be screened in metal conduits or
similar.The screening should be electrically continous for the entire lengh of the cable. It should also beconnect
to the welding machine with a good electrical contact between the metal conduit and the casing.
Welding cables: The welding cables should be kept as short as possible and should be positioned close
b.
together, running at or close to the floor level.
Protection and reinforcement: Selective screening and shielding of other cables and equipment in the
c.
surrounding area may alleviate problems of interference. Screening of the entire welding area may be considered
for special applications
Connect the earth directly to the metal piece to be welded: Where necessary, the connection of the
d.
workpiece to earth should be made by a direct connection to the workpiece, but in some countries where direct
connection is not permitted, the bonding should be achieved by suitable capacitance, selected according to
national regulations.
TROUBLESHOOTING
Anomalies
The device does not deliver any current and the
yellow indicator lamp of thermal defect lights up.
The display is on but the device does not deliver any
current.
If, when the unit is on and you put your hand on the
welding unit's body, you feel tingling sensation.
Your unit does not weld correctly.
When starting up, the display indicates
one second and turns off.
Instable arc
The tungsten electrode gets oxidised and tern at the
end of welding.
The electrode melts
Causes
The welder thermal protection
has turned on.
The cable of the earth clamp or
electrode holder is not
connected to the welder.
The welding unit is not correctly
connected to the earth.
Polarity error.
The voltage is not respected
during
(single phase 230V )
Default
coming
tungsten electrode
Too important gas flow rate
Welding zone
Default coming from post-gas or
the gas has been stopped
prematurely.
Polarity error
Remedies
Wait for the end of the cooling time, around
2 minutes. The indicator lamp turns off.
Check the connections.
Check the plug and the earth of your
electrical network.
Check the polarity advised on the electrode
packaging.
Have the electrical installation checked.
from
the
Use a tungsten electrode with the adequate
size
Use a well prepared tungsten electrode
Reduce gas flow rate
Protect welding zone against air flows
Increase post-gas duration
Check and tighten all gas connections. Wait
until
the electrode cools
stopping the gas.
Check that the earth
connected to +
down
before
clamp is
really
11/43
Publicité
