Sealey Mw131 User manual

MW131

MW151

MW151PLUS

MODELS:

INSTRUCTIONS FOR:

INVERTERS

MW131, MW151, MW151PLUS Issue No.1 24/10/11

INSTRUCTIONS FOR:

INVERTERS

MODEL No's: MW131, MW151, MW151PLUS

Thank you for purchasing a Sealey product. Manufactured to a high standard this product will, if used according to these instructions and properly maintained,

give you years of trouble free performance.

IMPORTANT: BEFORE USING THIS PRODUCT, PLEASE READ THE INSTRUCTIONS CAREFULLY. MAKE CAREFUL NOTE OF SAFETY INSTRUCTIONS,

WARNINGS AND CAUTIONS. THIS PRODUCT SHOULD ONLY BE USED FOR ITS INTENDED PURPOSE. FAILURE TO DO SO MAY CAUSE DAMAGE

AND/OR PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. RETAIN THESE INSTRUCTIONS FOR FUTURE USE.

1. SAFETY INSTRUCTIONS

1.1. ELECTRICAL SAFETY

WARNING! It is the responsibility of the owner and the operator to read, understand and comply with the following:

You must check all electrical products, before use, to ensure that they are safe. You must inspect power cables, plugs, sockets and any

other connectors for wear or damage. You must ensure that the risk of electric shock is minimised by the installation of appropriate safety

devices. A Residual Current Circuit Breaker (RCCB) should be incorporated in the main distribution board. We also recommend that a

Residual Current Device (RCD) is used. It is particularly important to use an RCD with portable products that are plugged into a supply

which is not protected by an RCCB. If in any doubt consult a qualified electrician. You may obtain a Residual Current Device by contacting

your Sealey dealer.

You must also read and understand the following instructions concerning electrical safety:

1.1.1. The Electricity at Work Act 1989 requires that all portable electrical appliances, if used on business premises, are tested by a qualified

electrician, using a Portable Appliance Tester (PAT), at least once a year.

1.1.2. The Health & Safety at Work Act 1974 makes owners of electrical appliances responsible for the safe condition of those appliances

and the safety of the appliance operators. If in any doubt about electrical safety, contact a qualified electrician.

1.1.3. Ensure that the insulation on all cables and on the appliance is safe before connecting it to the power supply. See 1.1.1. and 1.1.2.

and use a Portable Appliance Tester.

1.1.4. Ensure that cables are always protected against short circuit and overload.

1.1.5. Regularly inspect power supply cables and plugs for wear or damage and check all connections to

ensure that none are loose.

1.1.6. Important: Ensure that the voltage marked on the appliance matches the power supply to be used

and that the plug is fitted with the correct fuse.

1.1.7. DO NOT pull or carry the appliance by the power cable.

1.1.8. DO NOT pull the plug from the socket by the cable.

1.1.9. DO NOT use worn or damaged cables, plugs or connectors. Immediately have any faulty item

repaired or replaced by a qualified electrician. When a BS 1363/A UK 3 pin plug is damaged, cut

the cable just above the plug and dispose of the plug safely.

Fit a new plug according to the following instructions (UK only).

a) Connect the GREEN/YELLOW earth wire to the earth terminal ‘E’.

b) Connect the BROWN live wire to the live terminal ‘L’.

c) Connect the BLUE neutral wire to the neutral terminal ‘N’.

d) After wiring, check that there are no bare wires, that all wires have been correctly connected, that the cable outer insulation

extends beyond the cable restraint and that the restraint is tight.

Double insulated products, which are always marked with this symbol , are fitted with live (brown) and neutral (blue) wires only.

To rewire, connect the wires as indicated above - DO NOT connect either wire to the earth terminal.

1.1.10. Products which require more than 13 amps are supplied without a plug. In this case you must contact a qualified electrician to ensure

that a suitably rated supply is available. We recommend that you discuss the installation of an industrial round pin plug and socket with

your electrician.

1.1.11. If an extension reel is used it should be fully unwound before connection. A reel with an RCD fitted is preferred since any appliance

plugged into it will be protected. The cable core section is important and should be at least 1.5mm², but to be absolutely sure that the

capacity of the reel is suitable for this product and for others which may be used in the other output sockets, we recommend the use of

2.5mm² section cable.

WARNING! Be very cautious if using a diesel generator. The generator must be stable with regard to frequency (H3), voltage

and wave form. The output must be higher than the power (kVA) of the inverter. The diesel generator must also be self

regulating. If any A.M. feature is not respected the working of the regulation card may be affected.

Use of a generator without a regulator may be dangerous and will invalidate your inverter warranty.

RECOMMENDED FUSE RATING

13AMP

Blue

Neutral

Wire

Yellow & Green

Earth Wire

Cable

Restraint

Brown

Live

Wire

1.2. GENERAL SAFETY

DANGER! Unplug the inverter from the mains power supply before connecting or disconnect cables or performing maintenance or

service. Direct contact with the inverter circuit is dangerous.

 Keep the inverter and cables in good working order and condition. Take immediate action to repair or replace damaged parts.

 Use genuine parts and accessories only. Unapproved parts may be dangerous and will invalidate the warranty.

 Keep the inverter clean for best and safest performance.

 Locate the inverter in a suitable work area. Ensure that the area has adequate ventilation as welding fumes are harmful.

 WARNING! Cable connectors must be turned fully into the quick plugs to ensure a good electrical contact. Loose connections will

cause overheating, rapid deterioration and loss in efficiency.

 Ensure that there is no obstruction to the flow of clean, cool air and ensure that there are no conductive dusts, corrosive vapours or humidity

which could enter the inverter and cause serious damage.

 Keep the work area clean and tidy and free from unrelated materials. Also ensure that the work area has adequate lighting.

 WARNING: Use welding head shield to protect eyes and avoid exposing skin to ultraviolet rays given off by electric arc. Wear safety

welding gauntlets.

 Remove ill fitting clothing, remove ties, watches, rings and other loose jewellery and contain long hair.

Ensure that the workpiece is correctly secured before operating the inverter.

 Avoid unintentional contact with workpiece. Accidental or uncontrolled arcing on the electrode holder may be dangerous.

 Protect cables from heat and sharp or abrasive items.

 Keep unauthorised persons away from the work area. Any persons working within the area must adorn the same protective items.

 Stand correctly keeping a good footing and balance, ensure that the floor is not slippery and wear non-slip shoes.

Original Language Version MW131, MW151, MW151PLUS Issue No.1 24/10/11

2.1. INTRODUCTION

Suitable for ARC welding or for TIG welding (optional) using scratch-start method. Automatic Arc-Force circuitry makes the unit suitable

for TIG welding with a wide variety of rods including rutile, basic and stainless from Ø1.6mm up to Ø3.2mm (MW131) and Ø4mm

(MW151 & MW151PLUS). Includes thermal cut-out and mains voltage LEDs. Fitted with Hot-Start system to counter electrode sticking

during scratch starting. Supplied in carry-case with 10mm² arc welding accessory kit (Model No. INVMMA1) for MW131 and 16mm² arc

welding accessory kit (Model No. INVMMA2) for MW151 and MW151PLUS. All models supplied with shoulder strap. Also suitable for TIG

welding with optional TIG accessory kit. MW151PLUS features surge protection, allowing unit to be powered by a generator. Minimum

generator output of 6kW required.

2.2. DESCRIPTION

These welding machines are a power source for ARC welding, made specifically for direct current (DC). The specific characteristics of

the “INVERTER” system provide high speed and precise regulation, ensuring a high quality result for all stick electrode welding.

The “INVERTER” system, regulated at the input of the primary mains, also allows for a drastic reduction in the volumes of both the

transformer and the reactance. This reduction in volume and weight enhances the mobility of the machines. The units have power

modules which have been developed on a special printed circuit designed to maximise reliability and reduce maintenance.

2.3. CIRCUIT SYSTEM DESCRIPTION Refer to fig. 1.

2.3.1. Mains input (single phase), rectifier unit and condenser.

2.3.2. Transistors and drivers switching bridge (IGBT). Turns the mains rectified

voltage into high frequency alternating voltage and permits power regulation

according to the current/voltage of the weld.

2.3.3. High frequency transformer: The primary windings are fed by the voltage

converted by Block 2. It has the function of adapting voltage and current to

the values required by the ARC welding procedure and, simultaneously,

isolates the welding circuit form the mains.

2.3.4. Secondary rectifier bridge with inductance. Changes the alternating current

supplied by the secondary windings into direct current.

2.3.5. Electronic and regulation board: Instantly checks the value of the welding

current against that selected by the user. It modulates the commands of the

IGBT drivers, which control regulation. The control board also determines the

dynamic response of the current transient during the phases of electrode

fusion (instant short circuit), and is responsible for the safety system.

2. DESCRIPTION

3. SPECIFICATION

3.1. SPECIFICATION

Model No. ................................MW131.................................... MW151 ....................................MW151PLUS

Peak Power: ............................130A........................................ 150A.........................................150A

Output:.....................................10 - 130A................................. 10 - 150A .................................10 - 150A

Duty Cycle: ..............................30% @ 130A........................... 25% @ 140A............................25% @ 140A

Electrode Capacity: ................. Ø1.6 - 3.2mm .......................... Ø1.6 - 4.0mm...........................Ø1.6 - 4.0mm

Max Absorbed Power: .............3.9kW ...................................... 4.2kW.......................................4.2kW

Mains Voltage:......................... 230V - 1PH ............................. 230V - 1PH ..............................230V - 1PH

Insulation Class: ...................... F .............................................. F...............................................F

Protection: ............................... IP21......................................... IP21 .........................................IP21

Weight: .................................... 4.1kg ....................................... 4.1kg ........................................4.1kg

TIG Accessory Kit:................... INVTIG1 .................................. INVTIG2...................................INVTIG2

fig.1

fig.2

 Operators must receive adequate training before using the inverter.

 WARNING: When unit is switched off the short-circuit light will come on for 10-15 seconds whilst capacitor discharges. DO NOT open unit until

light goes out.

 DO NOT operate the inverter if it or the cables are damaged.

 DO NOT use welding cables over 10m in length.

 DO NOT attempt to fit any unapproved electrode holder, components, or parts to the inverter unit.

 DO NOT connect the return cable to any metallic structure which is not part of the workpiece. This will jeopardise weld quality and may

be dangerous. Exception: Metallic work bench, but connect as near to weld as possible.

 DO NOT hit the electrode on the workpiece, this may damage the electrode and make strike-up difficult.

 DO NOT get inverter wet or use in damp or wet locations or areas where there is condensation.

 DO NOT weld without a welding safety head shield.

 DANGER! DO NOT weld near flammable materials - solids, liquids, or gases.

 DO NOT weld containers or pipes which have held flammable materials - gases, liquids or solids. Avoid operating on materials cleaned

with chlorinated solvents or near such solvents.

 DO NOT pull the inverter by the cables, or the electrode holder.

 DO NOT bend, strain or stand on cables.

 DO NOT place cables where they will endanger others. Long lengths of slack must be gathered and neatly coiled.

 DO NOT touch the workpiece close to the weld as it will be very hot. Allow to cool.

 DO NOT touch the torch immediately after use. Allow the electrode holder to cool.

 DO NOT operate the inverter whilst tired or under the influence of drugs, alcohol or intoxicating medication.

 When not in use, store the inverter in a safe, dry, childproof area.

MW131, MW151, MW151PLUS Issue No.1 24/10/11

Original Language Version

MW131

6. CABLE CONNECTION

WARNING! Ensure that the inverter is not plugged into the mains power supply

before assembling, connecting or disconnecting cables. For electrical installation,

see Safety Instructions (Section 1).

WARNING! Failure to follow the electrical safety instructions may affect the

operating performance and could damage the built-in safety system which, in

turn, could result in personal injury or fatality and will invalidate the warranty.

6.1. WELDING CABLE “ELECTRODE HOLDER” CONNECTION

Before connecting cables it is important to refer to the electrode manufacturer’s

instructions on the electrode packaging which will indicate the correct polarity connection

for the electrode, together with the most suitable current to use.

6.2. ARC WELDING

In principle, when ARC welding the Electrode Holder ”POSITIVE” is normally connected

to the “POSITIVE” (+) terminal (fig. 5).

6.3. WELDING “RETURN CABLE” - (WORK CLAMP) CONNECTION

The WORK CLAMP cable is connected to the terminal not occupied by the electrode

holder cable.

The clamp is connected to:

a) The workpiece, or

b) A metallic work bench. The connection must be as close to the proposed weld as

possible.

WARNING! Cable connectors must be turned fully into the quick plugs to ensure a

good electrical contact. Loose connections will cause overheating, rapid

deterioration and loss in efficiency. DO NOT use welding cables over 10m in length.

With the exception of a metallic workbench DO NOT connect the return cable to

any metallic structure which is not part of the workpiece, as this will jeopardise

weld quality and may be dangerous.

5. CABLE CLAMP ASSEMBLY

5.1. Work Clamp (See fig.4-A)

5.1.1. Remove the black rubber sleeve from the clamp arm which has the screw and plate and

thread the cable through the rubber sleeve. Remove the pre-cut section of insulation from

the cable end.

5.1.2. Loosen the clamp screw and plate and lay the cable into the back of the arm with

the bare wire under the plate. Tighten the clamp screw.

5.1.3. Slide the black rubber sleeve back over the clamp arm.

5.2. Electrode Holder (See fig.4-B)

5.2.1. Undo the handle retaining screw. Pull the handle from the head and thread the free end

of the cable through it, as shown. Remove the pre-cut section of insulation from the cable

end.

5.2.2. Loosen the clamp screw on the handle and fit the bared cable core under the clamp

plate as shown.

5.2.3. Tighten screw to clamp the cable end.

5.2.4. Refit the handle to the head and insert the retaining screw.

4. WELDING MASK ASSEMBLY

Original Language Version

4.1. Assembly: Referring to fig.3, separate the main components of the mask as shown in (A) and (B) into their separate parts. Trim any

spikes and burrs of excess plastic from the pieces in preparation for assembly.

4.1.1. Overlap the two main halves of the mask so that the fixing holes line up and insert one fixing (1) from the outside into the hole above the

window. Place the assembly face downwards.

4.1.2. Lay the tinted glass window (2) over the window opening and lay the frame (3) over the glass. Screw a plastic retainer ring (4) onto fixing

(1).

4.1.3. Lift up the assembly and insert the handle threads (7) through the two holes below the window. Turn the assembly over and fix the

handle with plastic retaining rings (8) and (9).

4.1.4. Insert fixing (5) through the remaining hole in the top of the mask and fix it with the remaining retaining ring (6).

4.2. Use: Always hold mask close to the face to provide maximum protection from radiation and droplets of molten metal.

4.2.1. Before each use check that the mask is

undamaged and that the filter glass is in

position and firmly retained. Remove any

metal droplets that may be on the glass.

Danger! Never use a filter glass that is

chipped, cracked or otherwise faulty

as severe eye damage may result.

Warning! DO NOT allow the mask to

come into contact with flame as the

fumes produced are harmful.

4.2.2. Clean with soapy water, DO NOT use

solvents.

fig.3

fig.4

fig.5

MW151, MW151PLUS

MW131, MW151, MW151PLUS Issue No.1 24/10/11

7. CONTROLS

8. PREPARATION

7.1. BACK PANEL (Fig.6).

Rocker switch. Turns mains power on and off.

7.2. FRONT PANEL (Fig.7).

7.2.1. Potentiometer. Regulates welding current with graduated outer scale in Amps.

May be adjusted during welding. Inner scale indicates recommended settings

for different welding rod diameters. Refer to your particular model for the actual

settings. Fig.7 shows the scale for MW151/MW151PLUS.

7.2.2. Green LED. Mains power indicator, machine ready.

7.2.3. Yellow LED. Normally off. ‘On’ indicates that there is no welding current due to

one of the following faults:

1. Thermal protection: Inside the inverter the temperature is excessive. The

machine is On but does not deliver current until a normal temperature is

reached. Once this happens the re-start is automatic.

2. Mains over/under voltage protection: When the supply voltage is too high

(over 260Vac) or too low (under 190Vac) the machine is blocked.

3. Short circuit protection: If there is a short-circuit lasting more than 1.5 secs

(i.e. electrode sticking), machine stops. Re-start is automatic.

8.1. The welding current must be regulated according to the diameter of the

electrode in use and the type of joint to be welded. See diameter/current chart

to the right.

8.2. Further consideration must be given to the location of the weld, for example:

Welds that are performed on a horizontal surface require a higher voltage than

those performed on a vertical or overhead surface.

8.3. The mechanical character of the weld will be determined not only by the current

used, but also by the diameter and quality of the electrode, the length of the arc

and the speed and position of the user. The condition of the electrode is an

important factor and it must never be wet or damp.

WARNING! Ensure that you read, understand and follow the safety

instructions. Place the welding mask in front of your face before striking

the arc.

9.1. ARC WELDING

9.1.1. Strike the electrode tip on the workpiece as if you were striking a match.

 WARNING! DO NOT hit the electrode on the workpiece, as this may damage

the electrode.

9.1.2. As soon as the arc is struck, maintain a distance from the workpiece equal to the

diameter of the electrode. Keep this distance as constant as possible for the

duration of the weld. As you advance along the workpiece the angle of the

electrode must be maintained atbetween 20ºand 30º. See fig.8.

9.1.3. At the finish of the weld, bring the end of the electrode backward in order to fill

the weld crater and then quickly lift the electrode from the weld pool to extinguish

the arc.

9. WELDING PROCEDURE

10. MAINTENANCE

WARNING! BEFORE CARRYING OUT ROUTINE MAINTENANCE, SWITCH

OFF THE WELDING MACHINE AND DISCONNECT IT FROM THE MAINS

POWER SUPPLY.

WARNING! IF THE WELDING MACHINE IS NOT FUNCTIONING PROPERLY

REPAIRS SHOULD BE CARRIED OUT ONLY AND EXCLUSIVELY BY

AUTHORISED SERVICE ENGINEERS.

WARNING! BEFORE REMOVING THE WELDING MACHINE PANELS,

SWITCH OFF THE MACHINE AND DISCONNECT IT FROM THE MAINS

POWER SUPPLY.

10.1. Periodically remove the casing and, with a low pressure air flow (max 10bar),

remove dust from inside the machine paying particular attention to transformer,

reactance and rectifier.

10.2. Do not direct compressed air onto the electronic circuit boards, these should be

cleaned with a very soft brush.

10.3. Ensure that all electrical connections are tight and check the wiring for damage

to the insulation.

10.4. Ensure that the casing is correctly replaced and secured before attempting to

use the inverter.

10.5. Keep the outside of the machine clean by wiping with a soft, dry cloth.

For any other service or maintenance, contact your local Sealey service

agent.

Original Language Version

fig.6

fig.7

MW151

Electrode Welding Current (Amps)

Diameter (mm) ......... Min.......................Max

1.6............................... 25.........................50

2.0............................... 40.........................80

2.5............................... 60.........................110

3.2............................... 80.........................160

4.0............................... 120.......................200

fig.8

MW131, MW151, MW151PLUS Issue No.1 24/10/11

12. RATINGS PLATE

On the rear of the inverter is the ratings plate, giving the following data:

1 - Rating of internal protection provided by casing.

2 - Symbol for power supply line: 1= Single-phase AC.

3 - 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.

4 - Welding procedure: manual arc welding with covered electrode

5 - Symbol for internal structure of the welding machine.

6 - The EUROPEAN standard relating to the safety and construction

of arc welding machines.

. 7 - Manufacturers Serial Number for welding machine identification.

8 - Output

º: Maximum no load voltage.

², U²: Current and corresponding normalised voltage that the

welding machine can supply during welding.

X: Welding ratio based on a 10 minute duty cycle. 30% indicates 3

minutes welding and 7 minutes rest, 100% indicates continuous welding.

A/V-A/V: Shows the range of adjustment for the welding current

(minimum - maximum) at the corresponding arc voltage.

9 - Power Supply

U1: Alternating voltage and power supply frequency of welding machine. (allowed limit ± 10%)

I1 max: Maximum current absorbed by the line.

I1 eff: Effective current supplied.

10 -Size of delayed fuse for protection of power supply.

11 -Symbols referring to safety regulations.

13. ELECTROMAGNETIC COMPATIBILITY

13.1. THIS EQUIPMENT IS IN CONFORMITY WITH THE EUROPEAN STANDARD ON THE ELECTROMAGNETIC COMPATIBILITY

OF ARC WELDING EQUIPMENT AND SIMILAR PROCESSES (e.g. ARC AND PLASMA CUTTING)

13.2. Protection against interference. (E.M.C.) The emission limits in this standard may not, however, provide full protection against

interference to radio and television reception when the equipment is used closer than 30m to the receiving antenna. In special cases,

when highly susceptible apparatus is being used in close proximity, additional mitigation measures may have to be employed in order

to reduce the electromagnetic emissions. At the same time there could occur some potential difficulties in having electromagnetic

compatibility in a non-industrial environment (e.g. in residential areas). Therefore it is most important that the equipment is used and

installed according to the following instructions.

13.3. Installation and use. The user is responsible for installing and using the equipment according to these instructions. If electromagnetic

disturbances are detected, then it shall be the responsibility of the user of the equipment to resolve the situation with the technical

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, 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.’

13.4. 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.

13.5. 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.

Original Language Version

11. TROUBLESHOOTING

If you have a problem with the inverter, check to ensure that the following are correct:

●Check that the welding current, which is controlled by the potentiometer (fig.7), is suitable for the diameter and type of electrode being

used.

●When the mains rocker switch is On, check that the green mains lamp is on. If this is not the case then there may be a mains supply

problem.

●Check the yellow LED - has the thermal cut-out activated? This indicates either an over or under voltage or short circuit. If the thermal

interrupter has activated, wait for the machine to cool down before re-starting.

●Check the nominal interruptance ratio is correct, and check that the fan is working correctly.

●Ensure that you are using the correct supply voltage.

●Check the machine output and ensure there is nothing causing a short-circuit.

●Check that all circuit connections are correct. In particular check that the work clamp is correctly attached to the workpiece. Ensure that

there is no grease, paint etc. on the surface.

MW131, MW151, MW151PLUS Issue No.1 24/10/11

13.6. 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.

13.7. 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.

13.8. 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.

13.9. 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.

13.10.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.

Original Language Version

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.