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assistance of the supplier. In some cases this remedial action may be as simple as earthing the circuit (see Note). 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 the electromagnetic disturbances shall be reduced to the point where they are no longer troublesome. Note: The
welding/cutting circuit may or may not be earthed for safety reasons. Changing the earthing arrangements should only be
authorised by a person who is competent to assess whether the changes will increase the risk of injury, e.g. by allowing
parallel welding/cutting circuit 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.'
9.4.
Assessment of area. Before installing the equipment the user shall make an assessment of potential electromechanical problems in the
surrounding area. The size of the surrounding area to be considered will depend on the structure of the building and other activities that
are taking place. The surrounding area may extend beyond the boundaries of the premises.
The following shall be taken into account :
a) Other supply cables, control cables, signalling and telephone cables, above, below and adjacent to the welding equipment.
b) Radio and television transmitters and receivers.
c) Computer and other control equipment.
d) Safety critical equipment, e.g. security monitoring of industrial equipment.
e) The health of people in the vicinity, e.g. persons fitted with a pacemaker or hearing aid.
f) Equipment used for calibration or measurement.
g) The immunity of other equipment in the environment. The user shall ensure that other equipment being used in the environment is
compatible. This may require additional protective measures.
h) The time of day that welding and other activities are to be carried out.
9.5.
Mains supply. The equipment should be connected to the mains supply according to these instructions. If interference occurs, it may be
necessary to take additional precautions such as filtering of the mains supply. Consideration should also be given to shielding the supply
cable of permanently installed equipment in metallic conduit or equivalent. This shielding should be connected to the power source so
that good electrical contact is maintained between the conduit and the welding power source enclosure.
9.6.
Maintenance of the equipment. The equipment should be routinely maintained according to these instructions. All access and service
covers should be closed and properly fastened when the welding equipment is in operation. The welding equipment should not be
modified in any way except for those changes and adjustments covered in these instructions. In particular, the spark gaps of any arc
striking and stabilising devices should be adjusted and maintained according to the instructions.
9.7.
Cables. The welding/cutting cables should be kept as short as possible and should be positioned close together, running at or
close to the floor level.
9.8.
Equipotential bonding. Bonding of all metallic components in the welding/cutting installation and adjacent to it should be
considered. However, metallic components bonded to the workpiece will increase the risk that the operator could receive a shock by
touching these metallic components and the electrode at the same time. The operator should be insulated from all such bonded
metallic components.
9.9.
Earthing of the workpiece. Where the workpiece 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 workpiece to earth may reduce emissions in some, but not
all instances. Care should be taken to prevent the earthing of the workpiece increasing the risk of injury to others or damage to other
electrical equipment. Where necessary, the connection of the 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 a suitable capacitance, selected
according to national regulations.
9.10. Screening and shielding. Selective screening and shielding of other cables and equipment in the surrounding area may alleviate problems
of interference. Screening of the entire welding/cutting installation may be considered for special applications.
10. RATING PLATE
On the rear of the inverter is the rating plate, giving the following data:
1 - The standard relating to the safety and construction of arc welding
and associated equipment.
2 -
Inverter-transformer-rectifier.
3 -
Welding procedure: manual arc welding with covered electrode.
4 -
S: Indicates that welding may be carried out in environments with a
heightened risk of electric shock e.g. very close to large metallic objects.
5 - Power Supply: Single-phase AC.
6 -
Rating of internal protection provided by casing.
7 - Output
U
: Maximum open-circuit voltage.
0
I
, U
: Current and corresponding voltage.
2
2
X: Welding ratio based on a 10 minute cycle. 30% indicates 3 minutes
welding and 7 minutes rest, 100% indicates continuous welding.
A/V-A/V: Welding current adjustment range and corresponding voltages.
8 -
Power Supply
U
: Rated supply voltage and frequency.
1
I
: Maximum current.
max
I
: Maximum effective current.
1eff
NOTE:
It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: No liability is accepted for incorrect use of this product.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
INFORMATION: For a copy of our catalogue and latest promotions call us on 01284 757525 and leave your full name, address and postcode.
Sole UK Distributor
Sealey Group,
Bury St. Edmunds, Suffolk.
9 - Delayed fuse for supply protection.
10 - Symbols referring to safety.
11 - Serial Number. Specifically identifies each inverter.
01284 757500
01284 703534
www.sealey.co.uk
Web
sales@sealey.co.uk
email
MW140PLUS.V2, MW160PLUS, MW170.V3 - 3 - 160505
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