EWM Picomig 225 puls TKG User manual

Operating instructions
EN
Welding machine
Picomig 225 puls TKG
Picomig 225 Synergic TKG
099-005682-EW501
Observe additional system documents!
7.9.2022

General instructions
WARNING
Read the operating instructions!
The operating instructions provide an introduction to the safe use of the products.
• Read and observe the operating instructions for all system components, especially the sa-
fety instructions and warning notices!
• Observe the accident prevention regulations and any regional regulations!
• The operating instructions must be kept at the location where the machine is operated.
• Safety and warning labels on the machine indicate any possible risks.
Keep these labels clean and legible at all times.
• The machine has been constructed to state-of-the-art standards in line with any applicable
regulations and industrial standards. Only trained personnel may operate, service and re-
pair the machine.
• Technical changes due to further development in machine technology may lead to a dif-
fering welding behaviour.
In the event of queries on installation, commissioning, operation or special conditions at the
installation site, or on usage, please contact your sales partner or our customer service
department on [phone].
A list of authorised sales partners can be found at www.ewm-group.com/en/specialist-dealers.
Liability relating to the operation of this equipment is restricted solely to the function of the equipment. No
other f orm of liability, regardless of type, shall be accepted. This exclusion of liability shall be deemed ac-
cepted by the user on commissioning the equipment.
The manufacturer is unable to monitor whether or not these instructions or the conditions and methods
are observed during installation, operation, usage and maintenance of the equipment.
An incorrectly performed installation can result in material damage and injure persons as a result. For this
reason, we do not accept any responsibility or liability for losses, damages or costs arising from incorrect
installation, improper operation or incorrect usage and maintenance or any actions connected to this in
any way.
© EWM AG
Dr. Günter-Henle-Strasse 8
56271 Mündersbach Germany
Tel.: [phone], Fax: -244
Email: [e-mail]
www.ewm-group.com
The copyright to this document remains the property of the manufacturer.
Copying, including extracts, only permitted with written approval.
The content of this document has been prepared and reviewed with all reasonable care. The information
provided is subject to change; errors excepted.
Data security
The user is responsible for backing up data of all changes from the factory setting. The user is liable for
erased personal settings. The manufacturer does not assume any liability for this.

Contents
Notes on using these operating instructions
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1 Contents
1Contents....................................................................................................................... 3
2For your safety.............................................................................................................. 5
2.1 Notes on using these operating instructions ............................................................... 5
2.2 Explanation of icons ............................................................................................... 6
2.3 Saf ety instructions .................................................................................................. 7
2.4 Transport and installation .......................................................................................10
3Intended use ................................................................................................................12
3.1 Applications..........................................................................................................12
3.1.1 Picomig 225 puls TKG ..............................................................................12
3.1.2 Picomig 225 Synergic TKG .......................................................................12
3.2 Documents which also apply ...................................................................................12
3.2.1 Warranty ................................................................................................12
3.2.2 Declaration of Conformity..........................................................................12
3.2.3 Welding in environments with increased electrical hazards.............................12
3.2.4 Service documents (spare parts and circuit diagrams) ...................................12
3.2.5 Calibration/Validation ...............................................................................12
3.2.6 Part of the complete documentation............................................................13
4Machine description – quick overview ...........................................................................14
4.1 Front view / rear view.............................................................................................14
4.2 Inside view ...........................................................................................................16
5Design and function .....................................................................................................17
5.1 Transport and installation .......................................................................................17
5.1.1 Ambient conditions ..................................................................................17
5.1.2 Machine cooling ......................................................................................18
5.1.3 Workpiece lead, general ...........................................................................18
5.1.4 Notes on the installation of welding current leads..........................................19
5.1.5 Stray welding currents ..............................................................................20
5.1.6 Welding torch holder ................................................................................21
5.1.7 Mains connection.....................................................................................22
5.1.7.1 Mains configuration.....................................................................22
5.1.8 Shielding gas supply (shielding gas cylinder for welding machine)...................23
5.1.8.1 Pressure regulator connection ......................................................23
5.1.8.2 Shielding gas hose connection .....................................................24
5.1.8.3 Gas test – setting the shielding gas volume ....................................24
5.1.9 Dirt filter .................................................................................................24
5.2 MIG/MAG welding .................................................................................................25
5.2.1 Welding torch and workpiece line connection ...............................................25
5.2.2 Wire feed................................................................................................26
5.2.2.1 Inserting the wire spool ...............................................................26
5.2.2.2 Changing the wire f eed rollers ......................................................27
5.2.2.3 Inching the wire electrode ............................................................30
5.2.2.4 Spool brake setting .....................................................................31
5.2.3 Welding task selection ..............................................................................31
5.3 MMA welding........................................................................................................32
5.3.1 Connecting the electrode holder and workpiece lead .....................................32
5.3.2 Welding task selection ..............................................................................32
5.4 TIG welding..........................................................................................................33
5.4.1 Preparing the TIG welding torch .................................................................33
5.4.2 Welding torch and workpiece line connection ...............................................33
5.4.3 Welding task selection ..............................................................................33
6Maintenance, care and disposal ....................................................................................34
6.1 General ...............................................................................................................34
6.2 Explanation of icons ..............................................................................................35
6.3 Maintenance schedule ...........................................................................................35
6.4 Disposing of equipment..........................................................................................37
7Rectifying faults ...........................................................................................................38
7.1 Software version of the machine control ...................................................................38

Contents
Notes on using these operating instructions
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7.2 Error messages (power source)...............................................................................38
7.3 Checklist for rectifying faults ...................................................................................39
7.4 Dynamic power adjustment.....................................................................................40
7.5 Resetting welding parameters to the factory settings ..................................................41
8Technical data .............................................................................................................42
8.1 Picomig 225 .........................................................................................................42
9Accessories.................................................................................................................43
9.1 Transport system ..................................................................................................43
9.2 Options................................................................................................................43
9.3 General accessories ..............................................................................................43
10 Replaceable parts ........................................................................................................44
10.1 Wire f eed rollers....................................................................................................44
10.1.1 Wire feed rollers for steel wire....................................................................44
10.1.2 Wire feed rollers for aluminium wire ............................................................44
10.1.3 Wire feed rollers for cored wire ..................................................................45
10.1.4 Wire guide ..............................................................................................45
11 Appendix .....................................................................................................................46
11.1 Searching for a dealer............................................................................................46

For your safety
Notes on using these operating instructions
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2 For your safety
2.1 Notes on using these operating instructions
DANGER
Working or operating procedures which must be closely observed to prevent imminent
serious and even fatal injuries.
• Safety notes include the "DANGER" keyword in the heading with a general warning symbol.
• The hazard is also highlighted using a symbol on the edge of the page.
WARNING
Working or operating procedures which must be closely observed to prevent serious
and even fatal injuries.
• Safety notes include the "WARNING" keyword in the heading with a general warning sym-
bol.
• The hazard is also highlighted using a symbol in the page margin.
CAUTION
Working or operating procedures which must be closely observed to prevent possible
minor personal injury.
• The safety information includes the "CAUTION" keyword in its heading with a general warn-
ing symbol.
• The risk is explained using a symbol on the edge of the page.
Technical aspects which the user must observe to avoid material or equipment damage.
Instructions and lists detailing step-by-step actions for given situations can be recognised via bullet
points, e.g.:
• Insert the welding current lead socket into the relevant socket and lock.

For your safety
Explanation of icons
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2.2 Explanation of icons
Symbol
Description
Symbol
Description
Indicates technical aspects which the
user must observe.
Activate and release / Tap / Tip
Switch off machine
Release
Switch on machine
Press and hold
Incorrect / Invalid
Switch
Correct / Valid
Turn
Input
Numerical value – adjustable
Navigation
Signal light lights up in green
Output
Signal light flashes green
Time representation (e.g.: wait 4 s / ac-
tuate)
Signal light lights up in red
Interruption in the menu display (other
setting options possible)
Signal light flashes red
Tool not required/do not use
Signal light lights up in blue
Tool required/use
Signal light flashes blue

For your safety
Safety instructions
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2.3 Safety instructions
WARNING
Risk of accidents due to non-compliance with the safety instructions!
Non-compliance with the safety instructions can be fatal!
• Carefully read the safety instructions in this manual!
• Observe the accident prevention regulations and any regional regulations!
• Inform persons in the working area that they must comply with the regulations!
Risk of injury from electrical voltage!
Voltages can cause potentially fatal electric shocks and burns on contact. Even low vol-
tages can cause a shock and lead to accidents.
• Never touch live components such as welding current sockets or stick, tungsten or wire
electrodes!
• Always place torches and electrode holders on an insulated surface!
• Wear the full personal protective equipment (depending on the application)!
• The machine may only be opened by qualified personnel!
• The device must not be used to defrost pipes!
Hazard when interconnecting multiple power sources!
If a number of power sources are to be connected in parallel or in series, only a techni-
cal specialist may interconnect the sources as per standard IEC 60974-9:2010: Installa-
tion and use and German Accident Prevention Regulation BVG D1 (formerly VBG 15) or
country-specific regulations.
Before commencing arc welding, a test must verify that the equipment cannot exceed
the maximum permitted open circuit voltage.
• Only qualified personnel may connect the machine.
• When taking individual power sources out of operation, all mains and welding current leads
must be safely disconnected from the welding system as a whole. (Hazard due to reverse
polarity voltage!)
• Do not interconnect welding machines with pole reversing switch (PWS series) or machines
for AC welding since a minor error in operation can cause the welding voltages to be com-
bined, which is not permitted.
Risk of injury due to radiation or heat!
Arc radiation can lead to skin and eye injuries.
Contact with hot workpieces and sparks can lead to burns.
• Use hand shield or welding helmet with the appropriate safety level (depends on the appli-
cation).
• Wear dry protective clothing (e.g. hand shield, gloves, etc.) in accordance with
the applicable regulations of your country.
• Persons who are not directly involved should be protected with a welding curtain or suitable
safety screen against radiation and the risk of blinding!

For your safety
Safety instructions
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WARNING
Risk of injury due to improper clothing!
During arc welding, radiation, heat and voltage are sources of risk that cannot be
avoided. The user has to be equipped with the complete personal protective equipment
at all times. The protective equipment has to include:
• Respiratory protection against hazardous substances and mixtures (fumes and vapours);
otherwise implement suitable measures such as extraction facilities.
• Welding helmet with proper protection against ionizing radiation (IR and UV radiation) and
heat.
• Dry welding clothing (shoes, gloves and body protection) to protect against warm environ-
ments with conditions comparable to ambient temperatures of 100 °C or higher and arcing
and work on live components.
• Hearing protection against harming noise.
Explosion risk!
Apparently harmless substances in closed containers may generate excessive pressure
when heated.
• Move containers with inflammable or explosive liquids away from the working area!
• Never heat explosive liquids, dusts or gases by welding or cutting!
Fire hazard!
Due to the high temperatures, sparks, glowing parts and hot slag that occur during
welding, there is a risk of flames.
• Be watchful of potential sources of fire in the working area!
• Do not carry any easily inflammable objects, e.g. matches or lighters.
• Ensure suitable fire extinguishers are available in the working area!
• Thoroughly remove any residue of flammable materials from the workpiece prior to starting
to weld.
• Only f urther process workpieces after they have cooled down. Do not allow them to contact
any flammable materials!

For your safety
Safety instructions
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CAUTION
Smoke and gases!
Smoke and gases can lead to breathing difficulties and poisoning. In addition, solvent
vapour (chlorinated hydrocarbon) may be converted into poisonous phosgene due to
the ultraviolet radiation of the arc!
• Ensure that there is sufficient fresh air!
• Keep solvent vapour away from the arc beam field!
• Wear suitable breathing apparatus if appropriate!
Noise exposure!
Noise exceeding 70 dBA can cause permanent hearing damage!
• Wear suitable ear protection!
• Persons located within the working area must wear suitable ear protection!
According to IEC 60974-10, welding machines are divided into two classes of
electromagnetic compatibility (the EMC class can be found in the Technical
data) > see 8 chapter:
Class A machines are not intended for use in residential areas where the power supply comes
from the low-voltage public mains network. When ensuring the electromagnetic compatibility of
class A machines, difficulties can arise in these areas due to interference not only in the supply
lines but also in the form of radiated interference.
Class B machines fulfil the EMC requirements in industrial as well as residential areas, inclu-
ding residential areas connected to the low-voltage public mains network.
Setting up and operating
When operating arc welding systems, in some cases, electro-magnetic interference can occur
although all of the welding machines comply with the emission limits specified in the standard.
The user is responsible for any interference caused by welding.
In order to evaluate any possible problems with electromagnetic compatibility in the
surrounding area, the user must consider the following: (see also EN 60974-10 Appendix A)
• Mains, control, signal and telecommunication lines
• Radios and televisions
• Computers and other control systems
• Safety equipment
• The health of neighbouring persons, especially if they have a pacemaker or wear a hearing
aid
• Calibration and measuring equipment
• The immunity to interference of other equipment in the surrounding area
• The time of day at which the welding work must be carried out
Recommendations for reducing interference emission
• Mains connection, e.g. additional mains filter or shielding with a metal tube
• Maintenance of the arc welding system
• Welding leads should be as short as possible and run closely together along the ground
• Potential equalization
• Earthing of the workpiece. In cases where it is not possible to earth the workpiece directly,
it should be connected by means of suitable capacitors.
• Shielding from other equipment in the surrounding area or the entire welding system
Electromagnetic fields!
The power source may cause electrical or electromagnetic fields to be produced which
could affect the correct functioning of electronic equipment such as IT or CNC devices,
telecommunication lines, power cables, signal lines and pacemakers.
• Observe the maintenance instructions > see 6.3 chapter!
• Unwind welding leads completely!
• Shield devices or equipment sensitive to radiation accordingly!
• The correct functioning of pacemakers may be affected (obtain advice from a doctor if nec-
essary).

For your safety
Transport and installation
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CAUTION
Obligations of the operator!
The respective national directives and laws must be complied with when operating the
machine!
• Implementation of national legislation relating to framework directive 89/391/EEC on the int-
roduction of measures to encourage improvements in the safety and health of workers at
work and associated individual guidelines.
• In particular, directive 89/655/EEC concerning the minimum safety and health requirements
for the use of work equipment by workers at work.
• The regulations applicable to occupational safety and accident prevention in the country
concerned.
• Setting up and operating the machine as per IEC 60974.-9.
• Brief the user on safety-conscious work practices on a regular basis.
• Regularly inspect the machine as per IEC 60974.-4.
The manufacturer's warranty becomes void if non-genuine parts are used!
• Only use system components and options (power sources, welding torches, electrode hold-
ers, remote controls, spare parts and replacement parts, etc.) from our range of products!
• Only insert and lock accessory components into the relevant connection socket when the ma-
chine is switched off.
Requirements for connection to the public mains network
High-performance machines can influence the mains quality by taking current from the mains
network. For some types of machines, connection restrictions or requirements relating to the
maximum possible line impedance or the necessary minimum supply capacity at the interface
with the public network (Point of Common Coupling, PCC) can therefore apply. In this respect,
attention is also drawn to the machines' technical data. In this case, it is the responsibility of the
operator, where necessary in consultation with the mains network operator, to ensure that the
machine can be connected.
2.4 Transport and installation
WARNING
Risk of injury due to improper handling of shielding gas cylinders!
Improper handling and insufficient securing of shielding gas cylinders can cause seri-
ous injuries!
• Observe the instructions from the gas manufacturer and any relevant regulations concern-
ing the use of compressed air!
• Do not attach any element to the shielding gas cylinder valve!
• Prevent the shielding gas cylinder from heating up.

For your safety
Transport and installation
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CAUTION
Risk of accidents due to supply lines!
During transport, attached supply lines (mains leads, control cables, etc.) can cause
risks, e.g. by causing connected machines to tip over and injure persons!
• Disconnect all supply lines before transport!
Risk of tipping!
There is a risk of the machine tipping over and injuring persons or being damaged itself
during movement and set up. Tilt resistance is guaranteed up to an angle of 10° (ac-
cording to IEC 60974-1).
• Set up and transport the machine on level, solid ground.
• Secure add-on parts using suitable equipment.
Risk of accidents due to incorrectly installed leads!
Incorrectly installed leads (mains, control and welding leads or intermediate hose pack-
ages ) can present a tripping hazard.
• Lay the supply lines flat on the floor (avoid loops).
• Avoid laying the leads on passage ways.
Risk of injury from heated coolant and its connections!
The coolant used and its connection or connection points can heat up significantly
during operation (water-cooled version). When opening the coolant circuit, escaping
coolant may cause scalding.
• Open the coolant circuit only when the power source or cooling unit is switched off!
• Wear proper protective equipment (protective gloves)!
• Seal open connections of the hose leads with suitable plugs.
The units are designed for operation in an upright position!
Operation in non-permissible positions can cause equipment damage.
• Only transport and operate in an upright position!
Accessory components and the power source itself can be damaged by incorrect connection!
• Only insert and lock accessory components into the relevant connection socket when the
machine is switched off.
• Comprehensive descriptions can be found in the operating instructions for the relevant ac-
cessory components.
• Accessory components are detected automatically after the power source is switched on.
Protective dust caps protect the connection sockets and therefore the machine against dirt and
damage.
• The protective dust cap must be fitted if there is no accessory component being operated on
that connection.
• The cap must be replaced if faulty or if lost!

Intended use
Applications
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3 Intended use
WARNING
Hazards due to improper usage!
The machine has been constructed to the state of the art and any regulations and stand-
ards applicable for use in industry and trade. It may only be used for the welding proce-
dures indicated at the rating plate. Hazards may arise for persons, animals and material
objects if the equipment is not used correctly. No liability is accepted for any damages
arising from improper usage!
• The equipment must only be used in line with its designated purpose and by trained or
expert personnel!
• Do not improperly modify or convert the equipment!
3.1 Applications
3.1.1 Picomig 225 puls TKG
Arc welding machine for standard and pulsed gas-shielded metal-arc welding with TIG welding and lift arc
(touch starting) or MMA welding as secondary process. It may be possible to expand the functionality by
using accessories (see the documentation in the relevant chapter).
3.1.2 Picomig 225 Synergic TKG
Arc welding machine for GMAW standard welding and in the secondary process TIG welding with Liftarc
(contact ignition) or MMA welding. Accessory components may expand the range of functions (see the
relevant documentation in the chapter of the same name).
3.2 Documents which also apply
3.2.1 Warranty
For more information refer to the "Warranty registration" brochure supplied and our information regarding
warranty, maintenance and testing at www.ewm-group.com!
3.2.2 Declaration of Conformity
This product corresponds in its design and construction to the EU directives listed in the decla-
ration. The product comes with a relevant declaration of conformity in the original.
The manufacturer recommends carrying out the safety inspection according to national and in-
ternational standards and guidelines every 12 months.
3.2.3 Welding in environments with increased electrical hazards
Power sources with this marking can be used for welding in an environment with increased
electrical hazard (e.g. boilers). For this purpose, appropriate national or international regulations
must be followed. The power source must not be placed in the danger zone!
3.2.4 Service documents (spare parts and circuit diagrams)
WARNING
No improper repairs and modifications!
To prevent injuries and damage to the machine, only competent personnel (authorised
service personnel) are allowed to repair or modify the machine.
Unauthorised manipulations will invalidate the warranty!
• Instruct competent personnel (authorised service personnel) to repair the machine.
Original copies of the circuit diagrams are enclosed with the unit.
Spare parts can be obtained from the relevant authorised dealer.
3.2.5 Calibration/Validation
An original certificate is enclosed with the product. The manufacturer recommends calibration / validation
at intervals of 12 months.

Intended use
Documents which also apply
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3.2.6 Part of the complete documentation
This document is part of the complete documentation and valid only in combination with all other
parts of these instructions! Read and observe the operating instructions for all system
components, especially the safety instructions!
The illustration shows a general example of a welding system.
Figure 3-1
Item
Documentation
A.1
Transport cart
A.2
Power source
A.3
Controller
A.4
Welding torch
A
Complete documentation

Machine description – quick overview
Front view / rear view
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4 Machine description – quick overview
4.1 Front view / rear view
Figure 4-1

Machine description – quick overview
Front view / rear view
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Item
Symbol
Description 0
1
Carrying handle
2
Machine control (see the relevant control operating instructions)
3
Welding torch connection (Euro torch connector)
Welding current, shielding gas and torch trigger integrated
4
Park socket, polarity selection plug
Retainer f or the polarity selection plug in MMA mode or for transport.
5
Machine feet
6
Transport bar
7
Main Switch
Switching the machine on or off.
8
Mains connection cable > see 5.1.7 chapter
9
Cooling air outlet
10
External wire feed inlet
Pre-cut casing inlet for external wire feed.
11
Connection thread - G¼"
Shielding gas connection (inlet)
12
Welding current cable, polarity selection
Welding current to Euro torch connector/torch, for polarity selection
• ----------- MIG/MAG: Connection socket for “+” welding current
• ----------- Self-shielding flux cored wire/TIG: Connection socket, “-” welding current
• ----------- MMA: Park socket
13
"-" welding current connection socket
• ----------- MIG/MAG welding: Workpiece connection
• ----------- TIG welding: Welding current connection for welding torch
• ----------- MMA welding: electrode holder connection
14
Connection socket, "+" welding current
• ----------- MIG/MAG cored wire welding: Workpiece connection
• ----------- TIG welding: Workpiece connection
• ----------- MMA welding: Workpiece connection
15
Cooling air inlet

Machine description – quick overview
Inside view
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4.2 Inside view
Figure 4-2
Item
Symbol
Description 0
1
Protective cap
Cover f or the wire f eed mechanism and other operating elements.
Depending on the machine series, additional stickers with information on the replace-
ment parts and JOB lists will be located on the inside.
2
Slide latch, lock for the protective cap
3
Wire spool inspection window
Check wire supply
4
Push-button, wire inching
Potential- and gas-free inching of the wire electrode through the hose package to the
welding torch > see 5.2.2.3 chapter.
5
Wire spool holder
6
Wire feed unit > see 5.2.2 chapter

Design and function
Transport and installation
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5 Design and function
WARNING
Risk of injury from electrical voltage!
Contact with live parts, e.g. power connections, can be fatal!
• Observe the safety information on the first pages of the operating instructions!
• Commissioning must be carried out by persons who are specifically trained in handling
power sources!
• Connect connection or power cables while the machine is switched off!
CAUTION
Risk of injury due to moving parts!
The wire feeders are equipped with moving parts, which can trap hands, hair, clothing
or tools and thus injure persons!
• Do not reach into rotating or moving parts or drive components!
• Keep casing covers or protective caps closed during operation!
Risk of injury due to welding wire escaping in an unpredictable manner!
Welding wire can be conveyed at very high speeds and, if conveyed incorrectly, may es-
cape in an uncontrolled manner and injure persons!
• Before mains connection, set up the complete wire guide system from the wire spool to the
welding torch!
• Check wire guide at regular intervals!
• Keep all casing covers or protective caps closed during operation!
Read and observe the documentation to all system and accessory components!
5.1 Transport and installation
WARNING
Risk of accident due to improper transport of machines that must not be lifted!
Do not lift or suspend the machine! The machine can drop and cause injuries! The
handles, straps or brackets are suitable for transport by hand only!
• The machine must not be suspended or lifted using a crane.
• Depending on machine type, equipment for lifting by crane or use while suspended is
available as a retrofitting option > see 9 chapter.
Damage to the machine due to improper transport!
The machine can be damaged by tensile or lateral forces if it is set down or picked up in a non-
vertical position!
• Do not drag the machine horizontally on the machine feet!
• Always pick up the machine vertically and set it down carefully.
5.1.1 Ambient conditions
The machine must not be operated in the open air and must only be set up and operated on a
suitable, stable and level base!
• The operator must ensure that the ground is non-slip and level, and provide sufficient lighting
for the place of work.
• Safe operation of the machine must be guaranteed at all times.
Equipment damage due to contamination!
Unusually high amounts of dust, acids, corrosive gases or substances can damage the machine
(observe maintenance intervals > see 6.3 chapter).
• Avoid large amounts of smoke, steam, oily fumes, grinding dust and corrosive ambient air!

Design and function
Transport and installation
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In operation
Temperature range of the ambient air:
• -25 °C to +40 °C (-13 °F to 104 °F) [1]
Relative humidity:
• up to 50 % at 40 °C (104 °F)
• up to 90 % at 20 °C (68 °F)
Transport and storage
Storage in a closed room, temperature range of the ambient air:
• -30 °C to +70 °C (-22 °F to 158 °F) [1]
Relative humidity
• up to 90 % at 20 °C (68 °F)
[1] Ambient temperature dependent on coolant! Observe the coolant temperature range of the torch coo-
ling
5.1.2 Machine cooling
Insufficient ventilation results in a reduction in performance and equipment damage.
• Observe the ambient conditions!
• Keep the cooling air inlet and outlet clear!
• Observe the minimum distance of 0.5 m from obstacles!
5.1.3 Workpiece lead, general
CAUTION
Risk of burning due to incorrect welding current connection!
If the welding current plugs (machine connections) are not locked or if the workpiece
connection is contaminated (paint, corrosion), these connections and leads can heat up
and cause burns when touched!
• Check welding current connections on a daily basis and lock by turning to the right when
necessary.
• Clean workpiece connection thoroughly and secure properly. Do not use structural parts of
the workpiece as welding current return lead!

Design and function
Transport and installation
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5.1.4 Notes on the installation of welding current leads
• Incorrectly installed welding current leads can cause faults in the arc (flickering).
• Lay the workpiece lead and hose package of power sources without HF igniter (MIG/MAG) for as long
and as close as possible in parallel.
• Lay the workpiece lead and hose package of power sources with HF igniter (TIG) for as long as pos-
sible in parallel with a distance of 20 cm to avoid HF sparkover.
• Always keep a distance of at least 20 cm to leads of other power sources to avoid interferences
• Always keep leads as short as possible! For optimum welding results max. 30 m (welding lead + inter-
mediate hose package + torch lead).
Figure 5-1
• Use an individual welding lead to the workpiece for each welding machine!
Figure 5-2
• Fully unroll welding current leads, torch hose packages and intermediate hose packages. Avoid loops!
• Always keep leads as short as possible!
Lay any excess cable lengths in meanders.
Figure 5-3

Design and function
Transport and installation
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5.1.5 Stray welding currents
WARNING
Risk of injury due to stray welding currents!
Stray welding currents can destroy protective earth conductors, damage machines and
electronic devices and cause overheating of components, leading to fire.
• Check that all welding current connections are firmly secured and electrical connections are
in perfect condition.
• Set up, attach or suspend all conductive power source components such as casing, trans-
port vehicles and crane frames so they are insulated.
• Do not place any other electronic devices such as drills or angle grinders on the power
source, transport vehicle or crane frames unless they are insulated.
• Always put welding torches and electrode holders on an insulated surface when they are
not in use.
Figure 5-4