• injury or death to the operator or a third party,
• damage to the device and other material assets belonging to the operating company,
• inefficient operation of the device.

• be suitably qualified,
• have sufficient knowledge of welding and
• read and follow these operating instructions carefully.

The operating instructions must always be at hand wherever the device is being used. In addition to the operating instructions, attention must also be paid to any generally applicable and local regulations regarding accident prevention and environmental protection.

• must be in a legible state,
• must not be damaged,
• must not be removed,
• must not be covered, pasted or painted over.

For the location of the safety and danger notices on the device, refer to the section headed "General" in the operating instructions for the device.
Before switching on the device, rectify any faults that could compromise safety.
This is for your personal safety!

The device is to be used exclusively for its intended purpose.

The device is intended solely for the welding processes specified on the rating plate.
Any use above and beyond this purpose is deemed improper. The manufacturer shall not be held liable for any damage arising from such usage.

• carefully reading and following all the instructions given in the operating instructions
• studying and obeying all safety and danger notices carefully
• performing all stipulated inspection and maintenance work.

• Thawing out pipes
• Charging batteries
• Starting engines

The device is designed for use in industry and the workshop. The manufacturer accepts no responsibility for any damage caused through use in a domestic setting.

The manufacturer likewise accepts no liability for inadequate or incorrect results.

Operation or storage of the device outside the stipulated area will be deemed as not in accordance with the intended purpose. The manufacturer shall not be held liable for any damage arising from such usage.

• during operation: -10 °C to + 40 °C (14 °F to 104 °F)
• during transport and storage: -20 °C to +55 °C (-4 °F to 131 °F)

• up to 50% at 40 °C (104 °F)
• up to 90% at 20 °C (68 °F)

The surrounding air must be free from dust, acids, corrosive gases or substances, etc.
Can be used at altitudes of up to 2000 m (6561 ft. 8.16 in.)

• are familiar with the fundamental instructions regarding safety at work and accident prevention and have been instructed in how to use the device
• have read and understood these operating instructions, especially the section "safety rules", and have confirmed as much with their signatures
• are trained to produce the required results.

Checks must be carried out at regular intervals to ensure that operators are working in a safety-conscious manner.

• to observe the basic instructions regarding safety at work and accident prevention
• to read these operating instructions, especially the "Safety rules" section and sign to confirm that they have understood them and will follow them.

Before leaving the workplace, ensure that people or property cannot come to any harm in your absence.

Devices with a higher rating may affect the energy quality of the mains due to their current consumption.

• Connection restrictions
• Criteria with regard to the maximum permissible mains impedance ^*)
• Criteria with regard to the minimum short-circuit power requirement ^*)

^*) at the interface with the public grid
see "Technical data"

In this case, the plant operator or the person using the device should check whether the device may be connected, where appropriate by discussing the matter with the power supply company.

IMPORTANT! Ensure that the mains connection is earthed properly

• flying sparks and hot pieces of metal
• Arc radiation, which can damage eyes and skin

• Hazardous electromagnetic fields, which can endanger the lives of those using cardiac pacemakers

• Risk of electrocution from mains current and welding current

• Greater noise pollution

• Harmful welding fumes and gases

• Flame-resistant
• Insulating and dry
• Covers the whole body, is undamaged and in good condition
• Safety helmet
• Trousers with no turn-ups

• Protect eyes and face from UV rays, heat and sparks using a protective visor and regulation filter
• Wear regulation protective goggles with side protection behind the protective visor
• Wear stout footwear that provides insulation even in wet conditions
• Protect the hands with suitable gloves (electrically insulated and providing protection against heat)
• Wear ear protection to reduce the harmful effects of noise and to prevent injury

• Make them aware of all the dangers (risk of dazzling by the arc, injury from flying sparks, harmful welding fumes, noise, possible risks from mains current and welding current, etc.)
• Provide suitable protective equipment
• Alternatively, erect suitable safety screens/curtains.

The fumes produced during welding contain harmful gases and vapours.

Welding fumes contain substances that cause cancer, as stated in Monograph 118 of the International Agency for Research on Cancer.

Use at-source extraction and a room extraction system.
If necessary, use a welding torch with an integrated extraction device.

Keep your face away from welding fumes and gases.

• must not be breathed in
• must be extracted from the working area using appropriate methods.

Ensure an adequate supply of fresh air. Ensure that there is a ventilation rate of at least 20 m³ per hour at all times.

Otherwise, a welding helmet with an air supply must be worn.

If there is any doubt about whether the extraction capacity is sufficient, the measured toxic emission values should be compared with the permissible limit values.

• Metals used for the workpiece
• Electrodes
• Coatings
• Cleaners, degreasers, etc.
• Welding process used

The relevant material safety data sheets and manufacturer's specifications for the listed components should therefore be studied carefully.

Recommendations for trade fair scenarios, risk management measures and for identifying working conditions can be found on the European Welding Association website under Health & Safety (https://european-welding.org).

Flammable vapours (e.g. solvent fumes) should be kept away from the arc's radiation area.

Close the shielding gas cylinder valve or main gas supply if no welding is taking place.

Flying sparks may cause fires or explosions.

Never weld close to flammable materials.

Flammable materials must be at least 11 metres (36 ft. 1.07 in.) away from the arc, or alternatively covered with an approved cover.

A suitable, tested fire extinguisher must be available and ready for use.

Sparks and pieces of hot metal may also get into adjacent areas through small gaps or openings. Take appropriate precautions to prevent any danger of injury or fire.

Welding must not be performed in areas that are subject to fire or explosion or near sealed tanks, vessels or pipes unless these have been prepared in accordance with the relevant national and international standards.

Do not carry out welding on containers that are being or have been used to store gases, propellants, mineral oils or similar products. Residues pose an explosive hazard.

An electric shock is potentially life threatening and can be fatal.

Do not touch live parts either inside or outside the device.

During MIG/MAG welding and TIG welding, the welding wire, the wirespool, the feed rollers and all pieces of metal that are in contact with the welding wire are live.

Always set the wirefeeder up on a sufficiently insulated surface or use a suitable, insulated wirefeeder holder.

Make sure that you and others are protected with an adequately insulated, dry base or cover for the earth or ground potential. This base or cover must extend over the entire area between the body and the earth or ground potential.

All cables and leads must be secured, undamaged, insulated and adequately dimensioned. Replace loose connections and scorched, damaged, or inadequately dimensioned cables and leads immediately.
Use the handle to ensure the power connections are tight before every use.
In the case of power cables with a bayonet connector, rotate the power cable around the longitudinal axis by at least 180° and pretension.

Do not wrap cables or leads around the body or parts of the body.

• never be immersed in liquid for cooling
• Never touch the electrode when the power source is switched on.

Double the open circuit voltage of a power source can occur between the welding electrodes of two power sources. Touching the potentials of both electrodes at the same time may be fatal under certain circumstances.

Arrange for the mains cable to be checked regularly by a qualified electrician to ensure the ground conductor is functioning properly.

Protection class I devices require a mains supply with ground conductor and a connector system with ground conductor contact for proper operation.

Operation of the device on a mains supply without ground conductor and on a socket without ground conductor contact is only permitted if all national regulations for protective separation are observed.
Otherwise, this is considered gross negligence. The manufacturer shall not be held liable for any damage arising from such usage.

If necessary, provide adequate earthing for the workpiece.

Switch off unused devices.

Wear a safety harness if working at height.

Before working on the device, switch it off and pull out the mains plug.

Attach a clearly legible and easy-to-understand warning sign to the device to prevent anyone from plugging the mains plug back in and switching it on again.

• Discharge all live components
• Ensure that all components in the device are de-energised.

If work on live parts is required, appoint a second person to switch off the main switch at the right moment.

• Fire hazard
• Overheating of parts connected to the workpiece
• Damage to ground conductors
• Damage to device and other electrical equipment

Ensure that the workpiece is held securely by the workpiece clamp.

Attach the workpiece clamp as close as possible to the area that is to be welded.

Position the device with sufficient insulation against electrically conductive environments, such as insulation against conductive floor or insulation to conductive racks.

If power distribution boards, twin-head mounts, etc., are being used, note the following: The electrode of the welding torch / electrode holder that is not used is also live. Make sure that the welding torch / electrode holder that is not used is kept sufficiently insulated.

In the case of automated MIG/MAG applications, ensure that only an insulated wire electrode is routed from the welding wire drum, large wirefeeder spool or wirespool to the wirefeeder.

• Are only designed for use in industrial settings
• Can cause line-bound and radiated interference in other areas

• Satisfy the emissions criteria for residential and industrial areas. This is also true for residential areas in which the energy is supplied from the public low-voltage mains.

EMC device classification as per the rating plate or technical data.

In certain cases, even though a device complies with the standard limit values for emissions, it may affect the application area for which it was designed (e.g. when there is sensitive equipment at the same location, or if the site where the device is installed is close to either radio or television receivers).
If this is the case, then the operator is obliged to take appropriate action to rectify the situation.

• Safety devices
• Network, signal and data transfer lines
• IT and telecommunications devices
• Measuring and calibrating devices

1. Mains supply
   • If electromagnetic interference arises despite the correct mains connection, additional measures are necessary (e.g. use of a suitable line filter)

1. Welding power-leads
   • must be kept as short as possible
   • must be laid close together (to avoid EMF problems)
   • must be kept well apart from other leads

1. Equipotential bonding

1. Earthing of the workpiece
   • If necessary, establish an earth connection using suitable capacitors.

1. Shield, if necessary
   • Shield other devices nearby
   • Shield the entire welding installation

• Effects on the health of persons in the vicinity, e.g. those with pacemakers and hearing aids
• Individuals with pacemakers must seek advice from their doctor before approaching the device or any welding that is in progress
• For safety reasons, maintain as large a distance as possible between the welding power-leads and the head/torso of the welder
• Do not carry welding power-leads and hosepacks over the shoulders or wind them around any part of the body

• Fans
• Cogs
• Rollers
• Shafts
• Wirespools and welding wires

Do not reach into the rotating cogs of the wire drive or into rotating drive components.

Covers and side panels may only be opened/removed while maintenance or repair work is being carried out.

• Ensure that all covers are closed and all side panels are fitted properly.
• Keep all covers and side panels closed.

The welding wire emerging from the welding torch poses a high risk of injury (piercing of the hand, injuries to the face and eyes, etc.).

Therefore, always keep the welding torch away from the body (devices with wirefeeder) and wear suitable protective goggles.

Never touch the workpiece during or after welding - risk of burns.

Slag can jump off cooling workpieces. The specified protective equipment must therefore also be worn when reworking workpieces, and steps must be taken to ensure that other people are also adequately protected.

Welding torches and other parts with a high operating temperature must be allowed to cool down before handling.

Special provisions apply in areas at risk of fire or explosion
- observe relevant national and international regulations.

Power sources for work in areas with increased electric risk (e.g. near boilers) must carry the "Safety" sign. However, the power source must not be located in such areas.

Risk of scalding from escaping coolant. Switch off cooling unit before disconnecting coolant flow or return lines.

Observe the information on the coolant safety data sheet when handling coolant. The coolant safety data sheet may be obtained from your service centre or downloaded from the manufacturer's website.

Use only suitable load-carrying equipment supplied by the manufacturer when transporting devices by crane.

• Hook chains or ropes onto all suspension points provided on the load-carrying equipment.
• Chains and ropes must be at the smallest angle possible to the vertical.
• Remove gas cylinder and wirefeeder (MIG/MAG and TIG devices).

If the wirefeeder is attached to a crane holder during welding, always use a suitable, insulated wirefeeder hoisting attachment (MIG/MAG and TIG devices).

If the device has a carrying strap or handle, this is intended solely for carrying by hand. The carrying strap is not to be used if transporting with a crane, counterbalanced lift truck or other mechanical hoist.

All lifting tackle (straps, handles, chains, etc.) used in connection with the device or its components must be tested regularly (e.g. for mechanical damage, corrosion or changes caused by other environmental factors).
The testing interval and scope of testing must comply with applicable national standards and directives as a minimum.

Odourless and colourless shielding gas may escape unnoticed if an adapter is used for the shielding gas connection. Prior to assembly, seal the device-side thread of the adapter for the shielding gas connection using suitable Teflon tape.

• Solid particle size < 40 µm
• Pressure condensation point < -20 °C
• Max. oil content < 25 mg/m³

Use filters if necessary.

Shielding gas cylinders contain gas under pressure and can explode if damaged. As the shielding gas cylinders are part of the welding equipment, they must be handled with the greatest of care.

Protect shielding gas cylinders containing compressed gas from excessive heat, mechanical impact, slag, naked flames, sparks and arcs.

Mount the shielding gas cylinders vertically and secure according to instructions to prevent them falling over.

Keep the shielding gas cylinders well away from any welding or other electrical circuits.

Never hang a welding torch on a shielding gas cylinder.

Never touch a shielding gas cylinder with an electrode.

Risk of explosion - never attempt to weld a pressurised shielding gas cylinder.

Only use shielding gas cylinders suitable for the application in hand, along with the correct and appropriate accessories (regulator, hoses and fittings). Only use shielding gas cylinders and accessories that are in good condition.

Turn your face to one side when opening the valve of a shielding gas cylinder.

Close the shielding gas cylinder valve if no welding is taking place.

If the shielding gas cylinder is not connected, leave the valve cap in place on the cylinder.

The manufacturer's instructions must be observed as well as applicable national and international regulations for shielding gas cylinders and accessories.

Risk of suffocation from the uncontrolled escape of shielding gas

Shielding gas is colourless and odourless and, in the event of a leak, can displace the oxygen in the ambient air.

• Ensure an adequate supply of fresh air with a ventilation rate of at least 20 m³/hour.
• Observe safety and maintenance instructions on the shielding gas cylinder or the main gas supply.
• Close the shielding gas cylinder valve or main gas supply if no welding is taking place.
• Check the shielding gas cylinder or main gas supply for uncontrolled gas leakage before every start-up.

• injury or death to the operator or a third party
• damage to the device and other material assets belonging to the operator
• inefficient operation of the device

Any safety devices that are not functioning properly must be repaired before switching on the device.

Never bypass or disable safety devices.

Before switching on the device, ensure that no one is likely to be endangered.

Check the device at least once a week for obvious damage and proper functioning of safety devices.

Always fasten the shielding gas cylinder securely and remove it beforehand if the device is to be transported by crane.

Only the manufacturer's original coolant is suitable for use with our devices due to its properties (electrical conductibility, anti-freeze agent, material compatibility, flammability, etc.).

Only use suitable original coolant from the manufacturer.

Do not mix the manufacturer's original coolant with other coolants.

Only connect the manufacturer's system components to the cooling circuit.

The manufacturer accepts no liability for damage resulting from use of other system components or a different coolant. In addition, all warranty claims will be forfeited.

Cooling Liquid FCL 10/20 does not ignite. The ethanol-based coolant can ignite under certain conditions. Transport the coolant only in its original, sealed containers and keep well away from any sources of ignition.

Used coolant must be disposed of properly in accordance with the relevant national and international regulations. The coolant safety data sheet may be obtained from your service centre or downloaded from the manufacturer's website.

Check the coolant level before starting to weld, while the system is still cool.

It is impossible to guarantee that bought-in parts are designed and manufactured to meet the demands made of them, or that they satisfy safety requirements.

• Use only original spare and wearing parts (also applies to standard parts).
• Do not carry out any modifications, alterations, etc. to the device without the manufacturer's consent.
• Components that are not in perfect condition must be replaced immediately.
• When ordering, please give the exact designation and part number as shown in the spare parts list, as well as the serial number of your device.

The housing screws provide the ground conductor connection for earthing the housing parts.
Only use original housing screws in the correct number and tightened to the specified torque.

The manufacturer recommends that a safety inspection of the device is performed at least once every 12 months.

The manufacturer recommends that the power source be calibrated during the same 12-month period.

• after any changes are made
• after any additional parts are installed, or after any conversions
• after repair, care and maintenance has been carried out
• at least every twelve months.

For safety inspections, follow the appropriate national and international standards and directives.

Further details on safety inspection and calibration can be obtained from your service centre. They will provide you on request with any documents you may require.

Waste electrical and electronic equipment must be collected separately and recycled in an environmentally-friendly way, in accordance with the European Directive and national legislation. Used equipment must be returned to the distributor or disposed of via an approved local collection and disposal facility. Correct disposal of used equipment promotes the sustainable recycling of material resources. Failing to dispose of used equipment correctly can lead to adverse health and/or environmental impacts.

Packaging materials
Separate collection according to material. Check your local authority regulations. Crush containers to reduce size.

Devices with the CE mark satisfy the essential requirements of the low-voltage and electromagnetic compatibility directives (e.g. relevant product standards of the EN 60 974 series).

Fronius International GmbH hereby declares that the device is compliant with Directive 2014/53/EU. The full text on the EU Declaration of Conformity can be found at the following address: http://www.fronius.com

Devices marked with the CSA test mark satisfy the requirements of the relevant standards for Canada and the USA.

The user is responsible for the safekeeping of any changes made to the factory settings. The manufacturer accepts no liability for any deleted personal settings.

Copyright of these operating instructions remains with the manufacturer.

The text and illustrations are all technically correct at the time of printing. We reserve the right to make changes. The contents of the operating instructions shall not provide the basis for any claims whatsoever on the part of the purchaser. If you have any suggestions for improvement, or can point out any mistakes that you have found in the instructions, we will be most grateful for your comments.

The central control and regulation unit of the power sources is coupled with a digital signal processor. The central control and regulation unit and signal processor control the entire welding process.
During the welding process, the actual data is measured continuously and the device responds immediately to any changes. Control algorithms ensure that the desired target state is maintained.

The device has a "Power limitation" safety feature. This means that the power source can be operated at the power limit without compromising process safety.

• a precise welding process
• a high degree of reproducibility of all results
• excellent weld properties.

The devices are used in workshops and industry for manual applications with classical steel and galvanised sheets.

The TSt 2700c power sources are primarily used in light-gauge steel sheet (light steelwork) applications. Repair, maintenance, and assembly work in shipyards, automotive suppliers, workshops or the furniture construction industry are among the typical application areas. The TSt 2700c power sources thus position themselves in their power category between the trade/workshop sector and the industry sector.

• Machine and equipment construction
• Steelwork
• Plant and container construction
• Metal and gantry construction
• Rail vehicle construction

Warning notices and safety symbols are affixed to the power sources. These warning notices and safety symbols must not be removed or painted over. They warn against operating the device incorrectly, as this may result in serious injury and damage.

Welding is dangerous. The following basic requirements must be met:

• welders must be sufficiently qualified
• suitable protective equipment must be used
• all persons not involved in the welding process must be kept at a safe distance

Do not use the functions described here until you have thoroughly read and understood the following documents:

• these operating instructions
• all the operating instructions for the system components, especially the safety rules

The power sources can be operated with various system components and options. This makes it possible to optimise procedures and to simplify machine handling and operation, as necessitated by the particular field of application in which the power source is to be used.

The power sources can be operated with various system components and options. This makes it possible to optimise procedures and to simplify machine handling and operation, as necessitated by the particular field of application in which the power source is to be used.

A Voltage Reduction Device (VRD) is an optional safety device for reducing the voltage. It is recommended for environments in which the risk of an electric shock or electrical accident is increased considerably during arc welding:

• Due to a low human body resistance of the welder
• If the welder is exposed to a clear risk of touching the workpiece or other parts of the welding circuit

A low human body resistance is possible when there is:

• water in the area
• humidity
• heat, particularly ambient temperatures in excess of 32°C (89.6°F)

In wet, damp or hot locations, humidity or sweat can significantly reduce the skin resistance and the insulation resistance of protective equipment and clothing.

Such environments can include:

• Temporary dams for draining certain areas of a site during construction work (cofferdams)
• Trenches
• Mines
• Rain
• Areas partly submerged by water
• Spraywater areas

The VRD option reduces the voltage between the electrode and the workpiece. In safe conditions, the indicator for the currently selected welding process is permanently lit. A safe condition is defined as follows:

• The output voltage in an open circuit is limited to 35 V.

For as long as the welding operation is active (welding circuit resistance < 200 Ohm), the indicator of the currently selected welding process flashes and the output voltage may exceed 35 V.

A Voltage Reduction Device (VRD) is an optional safety device for reducing the voltage. It is recommended for environments in which the risk of an electric shock or electrical accident is increased considerably during arc welding:

• Due to a low human body resistance of the welder
• If the welder is exposed to a clear risk of touching the workpiece or other parts of the welding circuit

A low human body resistance is possible when there is:

• water in the area
• humidity
• heat, particularly ambient temperatures in excess of 32°C (89.6°F)

In wet, damp or hot locations, humidity or sweat can significantly reduce the skin resistance and the insulation resistance of protective equipment and clothing.

Such environments can include:

• Temporary dams for draining certain areas of a site during construction work (cofferdams)
• Trenches
• Mines
• Rain
• Areas partly submerged by water
• Spraywater areas

The VRD option reduces the voltage between the electrode and the workpiece. In safe conditions, the indicator for the currently selected welding process is permanently lit. A safe condition is defined as follows:

• The output voltage in an open circuit is limited to 35 V.

For as long as the welding operation is active (welding circuit resistance < 200 Ohm), the indicator of the currently selected welding process flashes and the output voltage may exceed 35 V.

The welding circuit resistance is greater than the minimum human body resistance (greater than or equal to 200 Ohm):

• VRD is active
• Open circuit voltage is limited to 35 V
• Unintentional contact with the output voltage does not put the welder at risk

The welding circuit resistance is less than the minimum human body resistance (less than 200 Ohm):

• VRD is inactive
• Output voltage not restricted in order to ensure sufficient welding power
• Example: Welding starts

In MMA welding mode:
Within 0.3 seconds of end of welding:

• VRD is active again
• The output voltage is limited to 35 V once more

The functions on the control panel are all arranged in a logical way. The individual parameters required for welding can be

• selected easily using buttons
• altered using buttons or the adjusting dial
• displayed on the digital display during welding

The power source uses the Synergic control panel and certain general items of data such as sheet thickness, filler metal, wire diameter and shielding gas to calculate the best welding parameters. As a result, stored knowledge is available at all times. All the parameters can be adjusted manually. The Synergic control panel also allows parameters to be set manually.

The functions on the control panel are all arranged in a logical way. The individual parameters required for welding can be

• selected easily using buttons
• altered using buttons or the adjusting dial
• displayed on the digital display during welding

The power source uses the Synergic control panel and certain general items of data such as sheet thickness, filler metal, wire diameter and shielding gas to calculate the best welding parameters. As a result, stored knowledge is available at all times. All the parameters can be adjusted manually. The Synergic control panel also allows parameters to be set manually.

The functions on the control panel are all arranged in a logical way. The individual parameters required for welding can be

• selected easily using buttons
• altered using buttons or the adjusting dial
• displayed on the digital display during welding

The power source uses the Synergic control panel and certain general items of data such as sheet thickness, filler metal, wire diameter and shielding gas to calculate the best welding parameters. As a result, stored knowledge is available at all times. All the parameters can be adjusted manually. The Synergic control panel also allows parameters to be set manually.

Various service parameters can be retrieved by pressing the "Parameter selection" buttons at the same time.

Opening the display

1Press and hold the "Parameter selection" button (left)
2Press the "Parameter selection" button (right)
3Release the "Parameter selection" buttons

The first parameter ("Firmware version") is displayed, e.g. "1.00 | 4.21"

Selecting parameters

1Select the required setup parameter using the "Mode" and "Process" buttons or the left-hand adjusting dial

Available parameters

Example: 1.00 | 4.21
Firmware version

Example: 2 | 491
Welding program configuration

Example: r 2 | 290
Number of the currently selected welding program

Example: iFd | 0.0
Motor current for wire drive in A
The value changes as soon as the motor is running.

Example: 654 | 32.1 = 65,432.1 hours = 65,432 hours 6 mins
Indicates the actual arc time since using for the first time
Note: The arc time indicator is not suitable as a basis for calculating hiring fees, for warranty purposes, etc.

2nd
2nd menu level for service engineers

A keylock can be selected to prevent the settings from being inadvertently changed on the control panel. As long as the keylock is active

• no settings can be made on the control panel
• only parameter settings can be retrieved
• any assigned "Save" button can be retrieved provided that an assigned "Save" button was selected when the keylock was enabled

Activate/deactivate the keylock as follows:

1Press and hold the "Mode" button
2Press the "Parameter selection" button (right)
3Release the "Mode" and "Parameter Selection" buttons

Keylock activated:
The message "CLO | SEd" appears on the displays.

Keylock deactivated:
The message "OP | En" appears on the displays.

Depending on which welding process you intend to use, a certain minimum equipment level will be needed in order to work with the power source.
The welding processes and the minimum equipment levels required for the welding task are then described.

Depending on which welding process you intend to use, a certain minimum equipment level will be needed in order to work with the power source.
The welding processes and the minimum equipment levels required for the welding task are then described.

Depending on which welding process you intend to use, a certain minimum equipment level will be needed in order to work with the power source.
The welding processes and the minimum equipment levels required for the welding task are then described.

• Power source
• Grounding (earthing) cable
• MIG/MAG welding torch, gas-cooled
• Gas connection (shielding gas supply)
• Wire electrode

• Power source
• Cooling unit including coolant
• Grounding (earthing) cable
• MIG/MAG welding torch, water-cooled
• Gas connection (shielding gas supply)
• Wire electrode

• Power source
• Grounding (earthing) cable
• Electrode holder
• Rod electrode

The power source may only be used for MIG/MAG and MMA welding.
Any other form of usage is deemed "not in accordance with the intended purpose".
The manufacturer shall not be held liable for any damages arising from such usage.

• following all the information in the operating instructions
• carrying out all the specified inspection and servicing work

• Protection against penetration by solid foreign bodies with diameters > 12 mm (0.49 in.)
• Protection against spraywater at any angle up to 60° to the vertical

The device can be set up and operated outdoors in accordance with degree of protection IP 23.
Avoid direct wetting (e.g. from rain).

The venting duct is a very important safety device. When choosing the installation location, ensure that the cooling air can enter and exit unhindered through the air ducts on the front and back of the device. Electroconductive metallic dust (e.g. from grinding work) must not be allowed to get sucked into the device.

The devices are designed for the mains voltage specified on the rating plate. If your version of the appliance does not come with mains cables and plugs ready-fitted, these must be fitted in accordance with national regulations and standards. For details of fuse protection of the mains lead, please see the technical data.

A strain-relief device for the following cable cross-sections is fitted to the power source:

Strain-relief devices for other cable cross-sections must be designed accordingly.

A strain-relief device for the following cable cross-sections is fitted to the power source:

Strain-relief devices for other cable cross-sections must be designed accordingly.

The item numbers of the different cables can be found in the spare parts list.

American Wire Gauge

If no mains cable is connected, a mains cable that is suitable for the connection voltage must be fitted before commissioning.

The ground conductor should be approx. 10 - 15 mm (0.4 - 0.6 in.) longer than the phase conductors.

An illustration of the mains cable connection can be found in the following sections for fitting the strain-relief device. To connect the mains cable, proceed as follows:

1

2

3

4

5

IMPORTANT!
 Tie the phase conductors near the strain-relief device using cable ties.

1

2

3

4

5

IMPORTANT!
 Tie the phase conductors near the strain-relief device using cable ties.

1

2

3

4

5

IMPORTANT!
 Tie the phase conductors near the strain-relief device using cable ties.

1

2

3

4

IMPORTANT!
 Tie the phase conductors near the luster terminal using cable ties.

1

2

3

4

IMPORTANT!
 Tie the phase conductors near the luster terminal using cable ties.

The power source is generator-compatible.

The maximum apparent power S_1max of the power source must be known in order to select the correct generator output.
The maximum apparent power S_1max of the power source is calculated as follows:

3-phase devices: S_1max = I_1max x U₁ x √3

Single-phase devices: S_1max = I_1max x U₁

See device rating plate or technical data for I_1max and U₁ values

The generator apparent power S_GEN needed is calculated using the following rule of thumb:

S_GEN = S_1max x 1.35

A smaller generator may be used when not welding at full power.

IMPORTANT! The generator apparent power S_GEN must always be higher than the maximum apparent power S_1max of the power source.

When using single-phase devices with a 3-phase generator, note that the specified generator apparent power is often only available as a whole across all three phases of the generator. If necessary, obtain further information on the single-phase power of the generator from the generator manufacturer.

The power source is generator-compatible.

The maximum apparent power S_1max of the power source must be known in order to select the correct generator output.
The maximum apparent power S_1max of the power source is calculated as follows:

3-phase devices: S_1max = I_1max x U₁ x √3

Single-phase devices: S_1max = I_1max x U₁

See device rating plate or technical data for I_1max and U₁ values

The generator apparent power S_GEN needed is calculated using the following rule of thumb:

S_GEN = S_1max x 1.35

A smaller generator may be used when not welding at full power.

IMPORTANT! The generator apparent power S_GEN must always be higher than the maximum apparent power S_1max of the power source.

When using single-phase devices with a 3-phase generator, note that the specified generator apparent power is often only available as a whole across all three phases of the generator. If necessary, obtain further information on the single-phase power of the generator from the generator manufacturer.

As an alternative to three-phase operation, the multivoltage variant (MV) of the power source enables a welding operation with limited power or duration from just a single-phase supply. The maximum possible welding power is limited due to the dimensioning of the mains fuse protection, upon which the safety cut-out of the power source is dependant.

If the mains cable has a 20 A or 30 A fuse, the FUS parameter may be changed to 20 A or 30 A. Welding with a higher maximum power or for longer periods is therefore possible. The FUS parameter is in the level 2 Setup menu and can be set for a single-phase supply as well as to a US setting (SEt parameter to US).

In order to use the power source in single-phase operation, the following prerequisites must be fulfilled:

• Correct single-phase power source supply in accordance with the chapter "Installation and commissioning," section "Connecting the mains cable" - "Fitting the strain-relief device, single-phase operation."

The following table shows which mains voltages and fuse values limit the welding current in single-phase operation:

The welding current data applies at an ambient temperature of 40°C (104°F).

At a mains voltage of 240 V and a fuse value of 30 A the maximum value of 220 A for the MIG/MAG welding for instance is possible at a duty cycle of 40 %.

In single-phase operation a safety cut-out function prevents a triggering of the fuse at higher welding power values. The safety cut-out function is active at fuse values of 15 A, 16 A and 20 A and determines the possible welding time, without triggering of the fuse. If a cut-out of the welding current results due to exceeding the pre-calculated welding time, the service code „toF“ is displayed. In addition to the readout „toF“ from now on a countdown runs for displaying the remaining waiting time, until the welding readiness is restored. Then the message disappears an the power source is operational again.

At a fuse value of 30 A the temperature monitoring of the power source ensures the timely shutdown of the welding current, yet before the fuse triggers. This results in the display of the service codes „to1“ to „to7“. Detailed information concerning the servicecodes „to1“ to „to7“ is located in chapter „Troubleshooting and maintenance, section „Displayed service codes“. If there is no defect or soiling of the cooling components, here the power source is also ready for welding again after an adequate welding break.

As an alternative to three-phase operation, the multivoltage variant (MV) of the power source enables a welding operation with limited power or duration from just a single-phase supply. The maximum possible welding power is limited due to the dimensioning of the mains fuse protection, upon which the safety cut-out of the power source is dependant.

If the mains cable has a 20 A or 30 A fuse, the FUS parameter may be changed to 20 A or 30 A. Welding with a higher maximum power or for longer periods is therefore possible. The FUS parameter is in the level 2 Setup menu and can be set for a single-phase supply as well as to a US setting (SEt parameter to US).

In order to use the power source in single-phase operation, the following prerequisites must be fulfilled:

• Correct single-phase power source supply in accordance with the chapter "Installation and commissioning," section "Connecting the mains cable" - "Fitting the strain-relief device, single-phase operation."

The following table shows which mains voltages and fuse values limit the welding current in single-phase operation:

The welding current data applies at an ambient temperature of 40°C (104°F).

At a mains voltage of 240 V and a fuse value of 30 A the maximum value of 220 A for the MIG/MAG welding for instance is possible at a duty cycle of 40 %.

In single-phase operation a safety cut-out function prevents a triggering of the fuse at higher welding power values. The safety cut-out function is active at fuse values of 15 A, 16 A and 20 A and determines the possible welding time, without triggering of the fuse. If a cut-out of the welding current results due to exceeding the pre-calculated welding time, the service code „toF“ is displayed. In addition to the readout „toF“ from now on a countdown runs for displaying the remaining waiting time, until the welding readiness is restored. Then the message disappears an the power source is operational again.

At a fuse value of 30 A the temperature monitoring of the power source ensures the timely shutdown of the welding current, yet before the fuse triggers. This results in the display of the service codes „to1“ to „to7“. Detailed information concerning the servicecodes „to1“ to „to7“ is located in chapter „Troubleshooting and maintenance, section „Displayed service codes“. If there is no defect or soiling of the cooling components, here the power source is also ready for welding again after an adequate welding break.

For single-phase operation duty cycle values are given in the chapter „Technical data“, depending on the existing fuse value and the welding current. The percentage rates of this duty cycle values indeed relate as well to the 10-minute cycle, as explained in chapter „Technical data“ for the general duty cycle, however the cooling phase of the fuse is rated at only approximately 60 s. Thereafter, the power source is already operational again.

For reasons of technical standards the duty cycle in single-phase operation is only given for the time until the cut-out within the first welding cycle takes place. If the reference to the 10 minute cycle would also persist with regard to the cooling phase, which is usually valid for specifying the duty cycle, in practice longer welding phases than specified would be possible. You see that the specification relates to cooling phases of only approximately 60 s, after which the power source is already operational again.

The example given in the following shows the standard compliant welding and break cycles, at a welding current of 180 A and a duty cycle of 15 %.

The following diagram shows the welding time, which is possible according to the technical standards, depending on the given fuse value and the welding current.

(1) Mains fuse protection 10 A (2) Mains fuse protection 13 A
(3) Mains fuse protection 15 A (4) Mains fuse protection 16 A
(5) Mains fuse protection 20 A

The steps and activities described below include references to various system components, such as

• Trolley
• Cooling units (TSt 3500c only)
• Welding torches, etc.

For more detailed information about installing and connecting the system components, please refer to the appropriate operating instructions.

The steps and activities described below include references to various system components, such as

• Trolley
• Cooling units (TSt 3500c only)
• Welding torches, etc.

For more detailed information about installing and connecting the system components, please refer to the appropriate operating instructions.

The following diagram shows an overview of how the individual system components are put together.
For detailed information about the individual steps, please refer to the corresponding operating instructions for the system components.

TSt 2700c

TSt 3500c

In order to achieve optimum wire electrode feed, the feed rollers must be suitable for the diameter and alloy of the wire being welded.

An overview of the available feed rollers can be found in the spare parts lists.

1

2

3

4

1

2

IMPORTANT! To facilitate wire threading, the following sequences are possible when the "Wire threading" button is pressed and held down.

• Hold the button for up to one second ... the wire feed speed stays at 1 m/min or 39.37 ipm for the first second.
• Hold the button for up to 2.5 seconds ... after one second, the wire feed speed increases over the next 1.5 seconds.
• Hold the button for more than 2.5 seconds ... after 2.5 seconds, the wire is fed at a constant rate equal to the wire feed speed set for the Fdi welding parameter.

If you release the "Wire threading" button and press it again before one second has elapsed, the sequence starts again from the beginning. This makes it possible to continuously position the wire at a low wire feed speed of 1 m/min or 39.37 ipm where necessary.

If there is no "Wire threading" / "Gas-test" button, the torch trigger can be used in the usual way. Before using the torch trigger for wire threading, proceed as follows:

IMPORTANT! If the torch trigger is pressed instead of the "Wire threading"/"Gas-test" button, the welding wire runs at the feeder creep speed (depending on the welding program) for the first 3 seconds. After these 3 seconds, wirefeeding is briefly interrupted.

The welding system detects that the welding process should not start, but that the wire is to be fed in. At the same time, the gas solenoid valve closes, and the welding voltage on the wire electrode is switched off.

If the torch trigger is kept pressed, wire feeding restarts immediately without shielding gas and welding voltage, and the process continues as described above.

3

4

The device is started up by pressing the torch trigger (for manual applications).

The device is started up by pressing the torch trigger (for manual applications).

• Welding torch connected
• Feed rollers inserted
• Wirespool or basket-type spool with adapter inserted
• Wire electrode fed in
• Brake adjusted
• Feed roller contact pressure set
• All covers closed, all side panels in place, all protection devices intact and in their proper place
• Where applicable, water connections connected

Before proceeding further as described in the "Welding mode" section, the following activities are required for the "MIG/MAG standard synergic welding" and "MIG/MAG standard manual welding" processes:

"Power limitation" is a safety function for MIG/MAG welding. This means that the power source can be operated at the power limit whilst maintaining process safety.

Wire speed is a determining parameter for welding power. If it is too high, the arc gets smaller and smaller and may be extinguished. In order to prevent this, the welding power is lowered.

For the selected "MIG/MAG standard synergic welding" process, the symbol for the "Wire speed" parameter flashes as soon as the safety function trips. The flashing continues until the next welding start-up, or until the next parameter change.

For example, if the "Wire speed" parameter is selected, the reduced value for wire speed is displayed.

"Power limitation" is a safety function for MIG/MAG welding. This means that the power source can be operated at the power limit whilst maintaining process safety.

Wire speed is a determining parameter for welding power. If it is too high, the arc gets smaller and smaller and may be extinguished. In order to prevent this, the welding power is lowered.

For the selected "MIG/MAG standard synergic welding" process, the symbol for the "Wire speed" parameter flashes as soon as the safety function trips. The flashing continues until the next welding start-up, or until the next parameter change.

For example, if the "Wire speed" parameter is selected, the reduced value for wire speed is displayed.

"Power limitation" is a safety function for MIG/MAG welding. This means that the power source can be operated at the power limit whilst maintaining process safety.

Wire speed is a determining parameter for welding power. If it is too high, the arc gets smaller and smaller and may be extinguished. In order to prevent this, the welding power is lowered.

For the selected "MIG/MAG standard synergic welding" process, the symbol for the "Wire speed" parameter flashes as soon as the safety function trips. The flashing continues until the next welding start-up, or until the next parameter change.

For example, if the "Wire speed" parameter is selected, the reduced value for wire speed is displayed.

For details of the meaning, settings, setting range and units of the available welding parameters (e.g. gas pre-flow time), please refer to the "Setup parameters" chapter.

For details of the meaning, settings, setting range and units of the available welding parameters (e.g. gas pre-flow time), please refer to the "Setup parameters" chapter.

• Tacking work
• Short weld seams
• Automated and robot welding

"4-step mode" is suitable for longer weld seams.

Special 4-step mode allows the starting and final current to be configured in addition to the advantages of 4-step mode.

The "Spot welding" mode is suitable for welded joints on overlapped sheets.

Start by pressing and releasing the torch trigger - GPr gas pre-flow time - Welding current phase for the duration of the SPt spot welding time - GPo gas post-flow.

If the torch trigger is pressed again before the end of the spot welding time (< SPt), the process is cancelled immediately.

2-step stitch welding

The "2-step stitch welding" mode is suitable for welding short weld seams on thin sheets, to prevent the weld seams from dropping through the base material.

4-step stitch welding

The "4-step stitch welding" mode is suitable for welding longer weld seams on thin sheets, to prevent the weld seams from dropping through the base material.

• MIG/MAG standard synergic welding
• MIG/MAG standard manual welding

To obtain the best possible welding results, the arc length correction and dynamic welding parameters will sometimes need to be corrected.

The MIG/MAG standard manual welding process is a MIG/MAG welding process with no synergic function.
Changing one parameter does not result in any automatic adjustments to the other parameters. All of the variable parameters must therefore be adjusted individually, as dictated by the welding process in question.

The MIG/MAG standard manual welding process is a MIG/MAG welding process with no synergic function.
Changing one parameter does not result in any automatic adjustments to the other parameters. All of the variable parameters must therefore be adjusted individually, as dictated by the welding process in question.

The following parameters are available in MIG/MAG manual welding:

	Wire feed speed 1 m/min (39.37 ipm.) - maximum wire feed speed, e.g. 25 m/min (984.25 ipm.)
	Welding voltage TSt 2700c: 14.4 - 34.9 V TSt 3500c: 14.5 - 38.5 V
	Dynamic for influencing the short-circuiting dynamic at the moment of droplet transfer
	Welding current only for displaying the actual value

To obtain the best possible welding results, the arc-force dynamic parameter will sometimes need to be adjusted.

To obtain the best possible welding results, the arc-force dynamic parameter will sometimes need to be adjusted.

To obtain optimum welding results, it will sometimes be necessary to adjust the HotStart function.

• Improved ignition properties, even when using electrodes with poor ignition properties
• Better fusion of the base material during the start-up phase, meaning fewer cold-shut defects
• Largely prevents slag inclusions

For details on setting the available welding parameters, please refer to "Setup parameters", "Setup menu - level 2".

Legend

Hti	Hot-current time, 0 - 2 s, factory setting: 0.5 s
HCU	HotStart current, 100 - 200 %, factory setting 150 %
IH	Main current = set welding current

Function
During the specified hot-current time (Hti), the welding current is increased to a certain value. This value (HCU) is higher than the selected welding current (I_H).

As the arc becomes shorter, the welding voltage may drop so far that the rod electrode will tend to "stick". This may also cause "burn-out" of the rod electrode.

Electrode burn-out is prevented by activating the anti-stick function. If the rod electrode begins to stick, the power source immediately switches the welding current off. After the rod electrode has been detached from the workpiece, the welding operation can be continued without difficulty.

The anti-stick (Ast) function can be activated and deactivated in the Setup parameters in "Setup menu: level 2".

The "Save" buttons allow up to 5 EasyJob operating points to be saved. Every operating point matches the settings on the control panel.

EasyJobs can be stored for each welding process.

IMPORTANT! Setup parameters are not saved at this time.

The "Save" buttons allow up to 5 EasyJob operating points to be saved. Every operating point matches the settings on the control panel.

EasyJobs can be stored for each welding process.

IMPORTANT! Setup parameters are not saved at this time.

One of the "Save" buttons on the control panel must be pressed to retrieve the saved settings using the Up/Down welding torch.

1Press one of the "Save" buttons on the control panel, e.g.: The control panel will show the saved settings

The "Save" buttons can now be selected using the buttons on the Up/Down welding torch. Vacant "Save" buttons are skipped.

In addition to the "Save" button number lighting up, a number is displayed directly on the Up/Down welding torch:

	Number 1
	Number 2
	Number 3
	Number 4
	Number 5

The Setup menu provides simple access to expert knowledge in the power source and to additional functions. The Setup menu can be used to make simple adjustments of the parameters to suit the various job settings.

The Setup menu provides simple access to expert knowledge in the power source and to additional functions. The Setup menu can be used to make simple adjustments of the parameters to suit the various job settings.

The Setup menu provides simple access to expert knowledge in the power source and to additional functions. The Setup menu can be used to make simple adjustments of the parameters to suit the various job settings.

Configuring the setup parameters is described here with reference to the "MIG/MAG standard synergic welding" process. The procedure for changing other setup parameters is identical.

Accessing the Setup menu

1Use the "Process" button to select the "MIG/MAG standard synergic welding" process
2Press and hold the "Mode" button
3Press the "Process" button
4Release the "Mode" and "Process" buttons

The control panel is now in the Setup menu for the "MIG/MAG standard synergic welding" process - the last setup parameter that was selected is displayed.

Changing welding parameters

1Select the required setup parameter using the "Mode" and "Process" buttons or the left-hand adjusting dial
2Change the value of the setup parameter using the "Parameter selection" buttons or the right-hand adjusting dial

Exiting the Setup menu

1Press and hold the "Mode" button
2Press the "Process" button
3Release the "Mode" and "Process" buttons

"Min." and "max." are used for setting ranges that differ according to power source, welding program, etc.

"Min." and "max." are used for setting ranges that differ according to power source, welding program, etc.

IMPORTANT! If you reset the power source using the FAC factory setup parameter, the hot-current time (Hti) and HotStart current (HCU) setup parameters are also reset.

In conjunction with the level 2 of the Setup menu, the following restrictions occur:

Level 2 of the Setup menu cannot be selected:

• during welding
• if the "Gas test" function is active
• if the "Wire threading" function is active
• if the "Wire withdrawal" function is active
• if the "Blow through" function is active

If level 2 of the Setup menu is selected, the following functions are not available, even in robot mode:

• Welding start-up - the "Power source ready" signal will not be emitted
• Gas testing
• Threading the wire
• Wire withdrawal
• Blow-through

In conjunction with the level 2 of the Setup menu, the following restrictions occur:

Level 2 of the Setup menu cannot be selected:

• during welding
• if the "Gas test" function is active
• if the "Wire threading" function is active
• if the "Wire withdrawal" function is active
• if the "Blow through" function is active

If level 2 of the Setup menu is selected, the following functions are not available, even in robot mode:

• Welding start-up - the "Power source ready" signal will not be emitted
• Gas testing
• Threading the wire
• Wire withdrawal
• Blow-through

Accessing the Setup menu

1Press and hold the "Mode" button
2Press the "Process" button
3Release the "Mode" and "Process" buttons

The control panel is now in the Setup menu - the last setup parameter that was selected is displayed.

Selecting the "2nd" parameter

1Use the "Mode" and "Process" buttons or the left-hand adjusting dial to select the "2nd" setup parameter

Accessing the Level 2 Setup menu

1Press and hold the "Mode" button
2Press the "Process" button
3Release the "Mode" and "Process" buttons

Changing welding parameters

1Use the "Mode" and "Process" buttons or the left-hand adjusting dial to select the required setup parameter
2Change the value of the setup parameter using the "Parameter selection" buttons or the right-hand adjusting dial

Exiting the Level 2 Setup menu

1Press and hold the "Mode" button
2Press the "Process" button
3Release the "Mode" and "Process" buttons

Exiting the Setup menu

1Press and hold the "Mode" button
2Press the "Process" button
3Release the "Mode" and "Process" buttons

Measuring the welding circuit resistance makes it possible to have a consistent welding result at all times, even with hosepacks of different lengths. The welding voltage at the arc is then always precisely regulated, regardless of the length and cross-sectional area of the hosepack. The use of arc length correction is no longer required.

The calculated welding circuit resistance is shown on the display.

r = welding circuit resistance in milliohm (mOhm)

If the welding circuit resistance has been measured correctly, the set welding voltage will correspond exactly to the welding voltage at the arc. If you manually measure the voltage on the output jacks of the power source, this voltage will be higher than the welding voltage at the arc - that is, higher by the same amount as the voltage drop of the hosepack.

• If the length or cross-sectional area of the hosepack has changed, measure the welding circuit resistance again
• Measure the welding circuit resistance for every welding process separately with the appropriate welding power-leads

Measuring the welding circuit resistance makes it possible to have a consistent welding result at all times, even with hosepacks of different lengths. The welding voltage at the arc is then always precisely regulated, regardless of the length and cross-sectional area of the hosepack. The use of arc length correction is no longer required.

The calculated welding circuit resistance is shown on the display.

r = welding circuit resistance in milliohm (mOhm)

If the welding circuit resistance has been measured correctly, the set welding voltage will correspond exactly to the welding voltage at the arc. If you manually measure the voltage on the output jacks of the power source, this voltage will be higher than the welding voltage at the arc - that is, higher by the same amount as the voltage drop of the hosepack.

• If the length or cross-sectional area of the hosepack has changed, measure the welding circuit resistance again
• Measure the welding circuit resistance for every welding process separately with the appropriate welding power-leads

The measurement is finished when the welding circuit resistance is shown on the display in mOhm ( for example, 11.4).

Laying of the hosepacks has a significant effect on welding circuit inductivity and therefore affects the welding process. It is important to lay the hosepacks correctly in order to obtain the best possible welding result.

Laying of the hosepacks has a significant effect on welding circuit inductivity and therefore affects the welding process. It is important to lay the hosepacks correctly in order to obtain the best possible welding result.

The setup parameter "L" is used to display the most recently calculated welding circuit inductivity. The welding circuit inductivity is calibrated at the same time as the welding circuit resistance is measured. Detailed information can be found in the "Measuring welding circuit resistance" section.

The most recently calculated welding circuit inductivity L is shown on the right-hand digital display.

L ... Welding circuit inductivity (in microhenry)

The devices are equipped with an intelligent safety system. This means that to a large extent it has been possible to dispense with melting-type fuses. Melting-type fuses therefore no longer need to be replaced. After a possible malfunction has been remedied, the device is ready for use again.

The devices are equipped with an intelligent safety system. This means that to a large extent it has been possible to dispense with melting-type fuses. Melting-type fuses therefore no longer need to be replaced. After a possible malfunction has been remedied, the device is ready for use again.

The devices are equipped with an intelligent safety system. This means that to a large extent it has been possible to dispense with melting-type fuses. Melting-type fuses therefore no longer need to be replaced. After a possible malfunction has been remedied, the device is ready for use again.

Make a note of the serial number and configuration of the device and contact our After-Sales Service team with a detailed description of the error, if

• errors occur that are not listed below
• the troubleshooting measures listed are unsuccessful

If an error message that is not described here appears on the displays, proceed as follows to resolve the problem:

If the error occurs again despite several attempts to eliminate it, or if the troubleshooting measures listed here are unsuccessful.

Under normal operating conditions, the welding system requires only a minimum of care and maintenance. However, it is vital to observe some important points to ensure the welding system remains in a usable condition for many years.

Under normal operating conditions, the welding system requires only a minimum of care and maintenance. However, it is vital to observe some important points to ensure the welding system remains in a usable condition for many years.

• Check mains plug, mains cable, welding torch, interconnecting hosepack and ground earth connection for damage
• Check that the device has an all-round clearance of 0.5 m (1 ft. 8 in.) to ensure that cooling air can flow in and out freely

If a lot of dust has accumulated:

• Remove the fin element on the rear of the housing
• Detach the air filter located behind and clean

• Remove the air filter on the rear of the housing from the side and clean

Dispose of in accordance with the applicable national and local regulations.

For devices designed for special voltages, the technical data on the rating plate applies.

For all machines with a permitted mains voltage of up to 460 V: The standard mains plug allows the user to operate with a mains voltage of up to 400 V. For mains voltages up to 460 V fit a mains plug permitted for such use or install the mains supply directly.

For devices designed for special voltages, the technical data on the rating plate applies.

For all machines with a permitted mains voltage of up to 460 V: The standard mains plug allows the user to operate with a mains voltage of up to 400 V. For mains voltages up to 460 V fit a mains plug permitted for such use or install the mains supply directly.

Duty cycle (ED) is the proportion of time in a 10-minute cycle at which the device may be operated at its rated output without overheating.

Example: Welding at 150 A at 60% ED

• Welding phase = 60% of 10 minutes = 6 minutes
• Cooling phase = remaining time = 4 minutes
• After the cooling phase, the cycle begins again.

If the device is to be continuously operated without stopping: