Sealey Pp40h User manual

INSTRUCTIONS FOR

PLASMA INVERTER

PP40H

MODEL No:

Original Language Version PP40H Issue: 1 - 08/05/13

2.1. 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.

2.1.1. 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.

2.1.2. 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.

2.1.3. Ensure that the insulation on all cables and on the appliance is safe before connecting it to the power supply. See 2.1.1. and 2.1.2.

and use a Portable Appliance Tester.

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

2.1.5. Regularly inspect power supply cables and plugs for wear or damage and check all connections to ensure that none are loose.

2.1.6. 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 - see rating at right.

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

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

2.1.9. DO NOT use worn or damaged cables, plugs or connectors. Have any faulty item repaired

or replaced by a qualified electrician.

2.1.10. This product will require more than a 13Amp electrical supply for full performance, so a plug

 isnottted.Itisasinglephasemachineandmustberunfroma32Ampsupplyforfullperformance.Werecommendyoudiscussthe

 installationofanindustrialroundpinplugandsocketwithaqualiedelectrician.

Fit a 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.

WARNING!Reminder,theelectricalinstallationoftheplasmacuttingunitmustonlybecarriedoutbyaqualiedelectrician.

WARNING! Be very cautious if using a generator to power the inverter. The generator must be self regulating and stable with regard

to voltage, waveform and frequency. The output must be greater than the power consumption of the inverter. If any of these

requirements is not met the electronics within the inverter may be affected.

NOTE: The use of an unregulated generator may be dangerous and will invalidate the warranty.

WARNING! The inverter may produce voltage surges in the mains supply which can damage other sensitive equipment

(e.g. computers). It is recommended that the inverter is connected to a power supply that does not feed any sensitive equipment.

2.1.11. If an extension reel is used it should be as short as possible and 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.

INSTRUCTIONS FOR:

PLASMA INVERTER 40AMP 230V

MODEL No: PP40H

Thank you for purchasing a Sealey plasma inverter. 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.

2. SAFETY INSTRUCTIONS

1.1. Introduction

Inverter power supply fitted with plasma cutter control circuitry. Inverter features four LED information panel including torch

under voltage, air fault, general fault (thermostat, over/under-voltage, over current) and power on. Supplied with plasma torch and

earth cable. Features regulated push button arc that avoids having to touch the work piece. Ideal for cutting steel, stainless,

galvanised steel, aluminium, copper and brass. Includes integral regulator unit with panel-mounted pressure gauge. IP21S Rated.

Model No: .........................PP40H

Power Output: ......................15-40A

Duty Cycle: .....................35% @ 40A

Air Requirement: ................. 300ltr/min

Air Pressure:...................... 45-70psi

Supply Voltage: ................. 230V - 1ph

Power Absorbed: ....................5.7kW

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

Protection: ......................... IP21S

Weight: ...........................14.54kg

Max. Cutting Capacity (Carbon Steel):.... 10mm

Accessories Included*: .................. Yes

*Plasma Torch and Earth Cable

1. INTRODUCTION & SPECIFICATIONS

Original Language Version PP40H Issue: 1 - 08/05/13

230V 1ph

THE PLASMA INVERTER

MUST BE CONNECTED TO A

32AMP SUPPLY FOR

MAXIMUM OUTPUT

1.2.

3. CARRY STRAP ASSEMBLY

2.2. GENERAL SAFETY

DANGER! Direct contact with the plasma inverter circuit or torch is dangerous. You MUST unplug the inverter from the mains power

supply, before connecting or disconnecting cables or performing maintenance or service.

 Keep the plasma inverter, cables and torch in good condition. Take immediate action to repair or replace damaged parts.

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

 Only use the cutting torch provided and ensure that any replacement is of the same type.

 Use the plasma inverter in a suitable work area. Ensure that the area has adequate ventilation as cutting fumes are harmful.

For enclosed areas we recommend the use of an air and smoke extraction system. If you are not able to provide adequate

extraction and/or ventilation, wear a respirator suitable for protection against toxic fumes, smoke and gases.

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

or humidity which could enter the unit and cause serious damage.

 WARNING: Use a welding head shield to protect your eyes and avoid exposing skin to the ultraviolet rays given off by the electric

arc. Always wear protective clothing, insulating gloves and shoes. Keep all protective items clean and undamaged.

 Remove ill fitting clothing before wearing protective clothing. Also remove watches, rings and other loose jewellery and contain long

hair.

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

Ensure that the workpiece is correctly secured before cutting.

 Avoid unintentional contact with the workpiece. Accidental or uncontrolled switching on of the torch may be dangerous and will wear

the nozzle.

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

the operator.

 DO NOT use cables and torch if the insulation is worn or connections are loose.

 DO NOT attempt to fit any unauthorised torch or other component to the plasma cutting unit.

 DO NOT cut surfaces that are painted, galvanic coated, oily or greasy.

 DO NOT use cables over 10m in length.

 DO NOT connect the return cable to any structure which is not part of the workpiece (other than a metal work bench supporting the

workpiece).

 DANGER! DO NOT cut near flammable materials - solids, liquids, or gases. Remove all flammable materials such as waste rags etc.

 DO NOT cut containers or pipes which have held flammable materials - gases, liquids or solids. DO NOT cut materials that have

been cleaned with chlorinated solvents (or near such solvents) as vapours from the arc action may produce toxic gases.

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

 DO NOT use the plasma inverter for a task it is not designed to perform.

 DO NOT operate the plasma inverter if any parts are damaged or missing as this may cause failure and/or personal injury.

 DO NOT carry, or pull, the inverter by the leads or cables. DO NOT strain or bend the cables, protect them from sharp or abrasive

items and DO NOT stand on them.

 Protect cables from heat. Long lengths of slack must be gathered and neatly coiled. DO NOT place cables where they will endanger

others.

 DO NOT hold unsecured workpiece in your hand.

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

 DO NOT touch the workpiece close to the cut as it will be very hot. Allow to cool. The cut edge of the workpiece will also be very

sharp.

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

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

WARNING! Before operating the machine ensure that you read, understand and apply Section 2 safety instructions. Ensure that the

machine is disconnected from the power supply before moving or changing accessories.

4.1. Air line

4.1.1. The supplied braided hose is plain one end for customer adaption and a 1/4"BSP female hexagon fitting the opposite end for

connection to the unit. Connect the hose to the air supply nipple shown in fig.2 and fig.4, tighten to obtain a seal only.

4.2. Torch lead

4.2.1. Connect, hand tight, the serrated plastic 1/4"BSP female fitting to the air line connection nipple shown in fig.1 and fig.4.

4.2.2. Pull the collar of the 3 pin plug back toward the cable and plug into the socket, observing the fit one way groove, and release the

collar. On removal, remember to pull back the collar initially and then the plug. DO NOT remove by pulling the cable.

4.2.3. Remove the pilot arc terminal knob fully and place the eye of the red cable over the screw and clamp with terminal knob.

4.3. Locating the inverter

4.3.1. Ensure that the work area has a good airflow and that there is no dust, smoke or gas present.

4.3.2. Ensure that there is a minimum clearance of 500mm around the machine, and that there are no obstacles to prevent a cool airflow.

Also check to ensure that the front outlet and rear grilles are not blocked.

4.3.3. When moving the machine, disconnect from the mains power supply and gather all cables safely.

4.4. Connecting the "+"ve return cable

Connect the work clamp to the workpiece or to the metal work bench as follows:

4.4.1. Check that there is a good electrical contact. Caution: Ensure that you have made good contact on oxidised or coated sheets.

4.4.2. Make the earth connection as close to the cutting area as possible.

4.4.3. DO NOT connect to structures or objects, other than the metal work bench which is supporting the workpiece. To do so may

damage the safety system and will give a poor cut.

4. SET UP AND CONTROLS

Original Language Version PP40H Issue: 2 - 08/05/13

If not already fitted, route the carry strap as shown.

DO NOT make the earth connection to the part of the workpiece that will be removed.

4.5. Isolation switch (see safety instructions for supply connection)

The I/O (on/off) switch is located at the rear of the machine (fig.2) and the switch will illuminate when switched on. A green LED will

also illuminate on the front panel (fig.1) indicating that mains power is present and the machine is in the ‘ready’ condition. The

control and duty circuits are now live but the torch will remain in ‘stand-by’ mode until the air supply is connected and the torch

button is pressed.

4.6. Cutting regulator

The cutting current is regulated by the knob/potentiometer on the front panel (fig.1).

4.7. Torch control

When the machine is turned on, the green indicator light (fig.1) will show that the torch is in “Stand-By” mode.

4.7.1. When the torch button is pressed the machine is activated and a red LED will illuminate (fig.1) indicating the presence of the pilot

arc. As a safety feature, should the following situations arise, the torch will automatically de-activate:

a) During Post-Air (>30sec) phase.

b) If the pilot arc is not moved to the workpiece within 2 seconds.

c) If the cutting arc is interrupted because the torch is held too far from the workpiece, or if the electrode is worn out, or if the torch

has been forced away from the workpiece.

d) If the warning LED illuminates indicating either mains voltage fluctuation or overheating.

4.8. Thermal switch and mains voltage fault

If the yellow LED (fig.1) on the front panel illuminates this indicates a mains voltage or thermal problem and the machine will be

automatically shut down as a result of one of the following:

a) The power transformer has overheated.

b) There has been a decrease or increase in the mains voltage supplied to the machine.

When the safety switch is activated in this way the problem is normally self-rectifying, and dependant upon duty cycle time, see

rating plate in section 9. The switch will re-set and the LED will go out and the machine is then ready for use again.

4.9. Torch

Although the machine and torch may be fully powered, the torch button is the only way to activate the cutting process.

4.9.1. To turn the cutting process on, the torch button must be fully depressed.

4.9.2. Release the button and the cutting cycle will stop immediately. The cooling air (post-air) will continue to flow for a further 30

seconds.

Note: To minimise the possibility of accidental starting, the button must be pressed for at least 1/5 of a second before the cutting

operation will start.

fig.1 fig.2

Original Language Version PP40H Issue: 1 - 08/05/13

"+"ve to

workpiece

Torch

connections and

"-" ve

I/O Switch

Power cable

Regulator

Air supply

Fan cover

Torch red LED

Warning

temperature

amber LED

Low air pressure

amber LED

Current adjust

Pressure gauge

Power on

green LED

Air line

connection

to torch

3 pin connection

Pilot arc

connection

Work piece

connection

fig.4

fig.3

PartsidenticationforFig.1andFig.2

Handle

Pneumatic hose

"+"ve lead

Torch pneumatic

hose, pilot arc

connection and

3 pin plug lead

WARNING! Before operating the machine ensure that you read, understand and apply Section 2 safety instructions and that you

have familiarised yourself with the controls. Ensure that the machine is disconnected from the power supply before moving or

changing accessories.

6.1. Set-up (air supply connected in section 5)

6.1.1. Check that the earth cable is correctly clamped to the workpiece or work bench (fig.5).

6.1.2. Switch on the mains power supply. Switch on the machine by operating the I/O switch on the rear panel (fig.2).

6.1.3. Set the current regulation control (fig.1) to the required value.

6.1.4. Press the torch button and release to commence the flow of cooling air (post-air).

6.1.5. Allow the air flow to continue to remove any condensation from the torch. The air flow will

automatically stop after approx. 30secs.

NOTE: Longer than standard nozzles and electrodes are available to improve accessibility in

awkward cutting positions. Ask your Sealey dealer for details.

6.2. Cutting from the edge

6.2.1. Bring the torch nozzle toward the edge of the workpiece and hold it at 3mm above the cutting line.

6.2.2. Press and hold down the torch button. After about 1/5 of a second of pre-air, the pilot arc will be

generated. If the distance between the torch nozzle and the workpiece is correct, the arc will

immediately jump to the workpiece and the cutting process will begin.

6.2.3. Move the torch slowly and smoothly forward, on the surface of the workpiece, along the cutting line.

6.2.4. Adjust the cutting speed according to the thickness of the material and the selected current.

6.2.5. Check the underside of the cut. The arc should make a 5 - 10° angle with the vertical in the

opposite direction to the cutting direction (fig.7).

6.3. Cutting from the centre

6.3.1. Place the torch nozzle at an angle to the surface at the start-of-cut position (fig.8).

5.3.2. Initiate the pilot arc, then slowly and smoothly bring the torch head to the upright position.

The arc will pierce the workpiece and cutting can start.

6.4. Arc off

6.4.1. Release the torch button to switch off the arc. The post-air will continue to flow, cooling the nozzle.

6.4.2. Other reasons for the arc ceasing are:

a) The distance between the torch nozzle and workpiece is too great.

b) You have completed a cut and have continued beyond the edge of a workpiece.

c) The waste falls away from the workpiece thus increasing the gap.

fig.7

fig.8

230V-1ph

Work piece

"+"

cable

Torch

Air line

"-"

3 pin connection

6. OPERATION

Original Language Version PP40H Issue: 1 - 08/05/13

5.1. Connect the air supply to the inverter. Pull up the regulator knob, sited on the inverter top face to regulate and push down to lock.

5.2. Ensure that the air supply pressure is set to a minimum of 80psi. The PP40H inverter requires 45-70psi and can be adjusted locally

by rotating the regulator knob in (5.1). The inverter pressure gauge is on the front face in (fig.1).

pWARNING! Ensure that the air supply is clean and lubricated by fitting an filter, regulator and lubricator in the supply air line.

5.3. Drain the compressor air tank daily.

5.4. Clean the compressor air inlet filter screen weekly.

5.5. Line pressure should be increased to compensate for unusually long air hoses (over 8 metres). The minimum hose bore should be

10mm and fittings must have the same inside dimensions.

5.6. Keep hoses away from heat, oil and sharp edges. Check hoses for wear, and make certain that all connections are secure.

5. AIR SUPPLY

fig.6

TO INVERTER

Customer supplied air line equipment

HOSE SUPPLIED

WITH INVERTER

fig.5

DANGER! Ensure that the machine is disconnected from the power supply before performing service or

maintenance on any part of the unit, cables or torch.

7.1. The inverter

DO NOT open the unit. Service and maintenance of the machine must only be undertaken by an

authorised service agent.

7.1.1. Keep the machine clean by wiping with a soft cloth. Do not use abrasives.

7.1.2. Periodically check to ensure that the carrying handle is in good order and condition. If not replace it

immediately.

7.1.3. Ensure that the front and rear air vents are not blocked.

7.2. Cables and leads

7.2.1. Check to ensure cables and leads are in good condition. If damaged, contact your authorised service

agent.

7.2.2. Keep cables and leads clean. Do not use solvents.

7.3. Torch

Check torch regularly. Maintenance will depend on frequency and type of usage and is essential for correct

and safe use of the torch.

WARNING! Ensure that the torch is cool before attempting any maintenance. Always re-assemble the torch

in the correct order as shown in (fig.9). Never use tools to tighten nozzle components, hand tighten only.

Manually dismantle the torch nozzle head.

7.3.1. Cap (fig.9.1).

Clean cap and check to ensure it is not damaged (including distortion, burns, cracks). If in any doubt,

replace.

7.3.2. Electrode (fig.9.2).

Check the build-up on the emitting surface of the electrode. When the build-up is approximately 2mm

replace the electrode.

NOTE: We recommend that the electrode and nozzle are changed at the same time.

7.3.3. Air distribution ring (fig.9.3).

Check that the ring is not burned or cracked and that the airflow holes are not obstructed. If damaged,

replace.

7.3.4. Nozzle (fig.9.4).

If the surface is oxidised, clean with extra fine abrasive paper. Check wear of the plasma arc hole and the

inner and outer surfaces. If hole has widened, or nozzle is damaged in any way, replace it. The nozzle “V”

crater should be 1.5mm in depth (fig.10).

7. MAINTENANCE

fig.10

8. TROUBLESHOOTING

9. RATING PLATE

fig.9

PROBLEM POSSIBLE CAUSE REMEDY

Insufficient penetration or excessive scoria settlement. Cutting speed too fast.

Torch angle too great.

Workpiece is too thick.

Electrode and nozzle are worn out.

Slow the cutting speed.

Adjust the torch angle.

Confirm workpiece thickness and re-check technical data.

Replace electrode and nozzle.

Interruption of cutting arc. Cutting speed too low.

Excessive distance between torch and workpiece.

Electrode is worn out.

Intervention of the protection system.

Increase the cutting speed.

Decrease the distance between torch and workpiece.

Replace electrode and nozzle.

Check warning lights and take appropriate action.

The torch is cutting at tilt when you wish it to be

perpendicular.

Torch position not correct.

Asymmetric wear of nozzle hole and/or wrong assembly of

torch parts.

Re-align the torch.

Check assembly (see fig.5) and change nozzle if necessary.

Excessive wear of nozzle and electrode. Air pressure too low.

Contaminated air (humidity-oil).

Excessive pilot arc ignitions in the air.

Nozzle holder damaged.

Increase air pressure (see Section 5).

Check air supply system (see Sections 4, 5 & 7).

Do not casually turn the torch on and off.

Change the nozzle holder.

Original Language Version PP40H Issue: 1 - 08/05/13

Equipment safety standard

Internal wiring information

Plasma symbol

AC supply details

Insulation protection rating

Max open circuit voltage

Rated supply voltage

Max RMS current absorbed

Effective current supplied

X Duty cycle based on 10 mins (35%

indicates 3.5mins cutting 6.5mins rest,

100% indicates continuous usage.

I2, U2:current and corresponding

voltage.

SERIAL NUMBER

PP40H

Cutting current range and

corresponding voltages.

Unique number

Sealey part number

10. ELECTROMAGNETIC COMPATIBILITY

10.1. 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)

10.2. 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.

10.3. 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, 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.’

10.4. 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.

10.5. 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.

10.6. 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.

10.7. 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.

10.8. 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.

10.9. Earthing of the workpiece. It is important that the workpiece is separately bonded to earth in addition to the welder/inverter return

cable. Where the workpiece is not bonded to earth for electrical safety reasons or 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..

10.10. 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.

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.