Kemppi MLS 2300 ACDC Technical manual

Mastertig
MLs™ 2300 aCDC
MasterCooL
20
1910032E
0743
Operation instruction • english
Gebrauchsanweisung • deutsch
Gebruiksaanwijzing • nederlands
Manuel d'utilisation • français

2 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
CONTENTS
1. PREFACE..................................................................................................................................3
1.1. INTRODUCTION....................................................................................................................3
1.2. PRODUCT INTRODUCTION .................................................................................................3
1.3. SAFETY INSTRUCTIONS......................................................................................................3
2. INSTALLATION.........................................................................................................................6
2.1. REMOVAL FROM PACKAGING.............................................................................................6
2.2. LOCATING THE MACHINE....................................................................................................6
2.3. SERIAL NUMBER ..................................................................................................................6
2.4. INSTALLATION AND MAIN PARTS .......................................................................................6
2.5. INSTALLATION OF THE PANEL............................................................................................7
2.6. MAINS CONNECTION...........................................................................................................7
2.7. WELDING CABLE CONNECTIONS ......................................................................................8
2.7.1. CHOOSING WELDING POLARITY IN MMA WELDING...........................................8
2.7.2. EARTHING................................................................................................................8
2.8. COOLING UNIT TO MASTERCOOL 20.................................................................................8
2.9. SHIELD GAS..........................................................................................................................9
2.9.1. INSTALLATION OF GAS BOTTLE............................................................................9
3. OPERATION ...........................................................................................................................10
3.1. WELDING PROCESSES .....................................................................................................10
3.1.1. MMA WELDING ......................................................................................................10
3.1.2. TIG WELDING ALTERNATING CURRENT.............................................................10
3.1.3. TIG WELDING WITH DIRECT CURRENT..............................................................10
3.1.4. SYNERGETIC PULSED TIG WELDING.................................................................11
3.1.5. LONG PULSED TIG WELDING..............................................................................11
3.1.6. SPOT WELDING FUNCTION .................................................................................11
3.1.7. MICROTACK™ FUNCTION....................................................................................11
3.1.8. TIG-WELDING WITH MIXED AC-DC CURRENT (MIX) .........................................11
3.2. OPERATION FUNCTIONS...................................................................................................11
3.2.1. POWER SOURCE ..................................................................................................11
3.2.2. FUNCTION PANELS...............................................................................................11
3.2.3. SAVING WELDING SETTINGS ..............................................................................17
3.2.4. ADOPTING THE SAVED SETTINGS......................................................................18
3.2.5. REMOTE CONTROL MEMORY CHANNELS.........................................................18
3.2.6. SETUP FUNCTIONS ..............................................................................................18
3.2.7. FOOT PEDAL CONTROL R11F..............................................................................18
3.3. COOLING UNIT OPERATION MASTERCOOL 20...............................................................18
3.4. STORAGE ............................................................................................................................18
3.5. ERROR CODES...................................................................................................................20
4. MAINTENANCE......................................................................................................................20
4.1. REGULAR MAINTENANCE.................................................................................................20
4.1.1. EVERY SIXTH MONTHS ........................................................................................20
4.1.2. SERVICE CONTRACT............................................................................................20
4.2. TROUBLESHOOTING .........................................................................................................21
4.3. DISPOSAL OF THE MACHINE............................................................................................21
5. ORDERING NUMBERS..........................................................................................................22
6. TECHNICAL DATA .................................................................................................................23
7. TERMS OF GUARANTEE ......................................................................................................24

Mastertig MLs™ 2300 aDCD / 0743 – 3© keMppi oy
1. PREFACE
1.1. INTRODUCTION
Congratulations on having purchased a KEMPPI product. Properly installed and used Kemppi
products should prove to be productive machines requiring a small amount of regular maintenance.
This manual is to give you a good understanding of the equipment and its safe operation. It also
contains maintenance information and technical specications. Read this manual completely from
front to back before installing, operating or maintaining the equipment for the rst time. For further
information on Kemppi products please contact us or your nearest Kemppi distributor.
The specications and designs presented in this manual are subject to change without prior
notice.
In this document, for danger to life or injury the following symbol is used:
Read the warnings carefully and follow the instructions. Please also study the Operation safety
instructions and respect them when installing, operating and servicing the machine.
1.2. PRODUCT INTRODUCTION
Kemppi Mastertig MLS™ ACDC is a family of TIG welding machines designed for industrial
use, with characteristics especially suitable for welding materials like aluminium and stainless
steel. The equipment consists of power source, function panel and welding torch. The cooling unit
Mastercool 20 is used in water-cooled TIG welding. The welding torch can be either water-cooled
or gas-cooled.
Multipurpose power source Mastertig MLS™ 2300 ACDC of 230 A maximum current is designed
for demanding professional welding, suitable for electrode, TIG and pulsed TIG welding with
both direct and alternating current. The power source is controlled with IGBT transistors with a
frequency of approximately 65 kHz, and the operational functions with a microprocessor.
1.3. SAFETY INSTRUCTIONS
Kemppi welding devices conform to international safety standards. Safety is an important issue
in equipment design and manufacturing. Therefore, Kemppi welding solutions are unparalleled in
safety. There are, however, always certain hazards involved in using welding equipment. Therefore,
to ensure your personal safety and the safety of your working environment, carefully read the safety
instructions below and respect them.
Use of personal protective equipment
• The arc and its reflecting radiation damage unprotected eyes. Shield your eyes and
face appropriately before you start welding or observe welding. Also note the different
requirements for the darkness of the screen in the mask as the welding current changes.
• The arc radiation and spatters burn unprotected skin. Always wear protective gloves, clothing
and footwear when welding.
• Always wear hearing protection if the ambient noise level exceeds the allowable limit (e.g.,
85 dB).
General operating safety
• Exercise caution when handling parts heated in welding. For example, the tip of the welding
torch, the end of the welding rod and the work piece will heat during gouging to a burning
temperature.
• Never wear the device on the shoulder during welding and never suspend it by the carrying
strap during welding.
• Do not expose the machine to high temperatures, as this may cause damage to the
machine.

4 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
• Keep the torch cable and earthing cable as close to each other as possible throughout their
length. Straighten any loops in the cables. This minimises your exposure to harmful magnetic
elds, which may interfere with a pacemaker, for example.
• Do not wrap the cables around the body.
• In environments classied as dangerous, only use S-marked welding devices with a safe idle
voltage level. These work environments include, for example, humid, hot or small spaces
where the user may be directly exposed to the surrounding conductive pieces.
Spatter and re safety
• Welding is always classied as hot work, so pay attention to re safety regulations during
welding and after it.
• Remember that re can break out from sparks even several hours after the welding work is
completed.
• Protect the environment from welding spatter. Remove ammable materials, such as
ammable uids, from the welding vicinity and supply the welding site with adequate re
ghting equipment.
• In special welding jobs, be prepared for hazards such as re or explosion when welding
container-type work pieces.
• Never direct the spark spray or cutting spray of a grinder toward the welding machine or
ammable materials.
• Beware of hot objects or spatter falling on the machine when working above the machine.
• Welding in ammable or explosive sites is absolutely forbidden.
General electric safety
• Only connect the welding machine to an earthed electric network.
• Note the recommended mains fuse size.
• Do not take the welding machine inside a container, vehicle or similar work piece.
• Do not place the welding machine on a wet surface and do not work on a wet surface.
• Do not allow the mains cable to be directly exposed to water.
• Ensure cables or welding torches are not squashed by heavy objects and that they are not
exposed to sharp edges or a hot work piece.
• Make sure that faulty and damaged welding torches are changed immediately as they can
be lethal and may cause electrocution or re.
• Remember that the cable, plugs and other electric devices may be installed or replaced only
by an electrical contractor or engineer authorised to perform such operations.
• Turn off the welding machine when it is not in use.
Welding power circuit
• Insulate yourself from the welding circuit by using dry and undamaged protective
clothing.
• Never touch the work piece and welding rod, welding wire, welding electrode or contact tip
at the same time.
• Do not put the welding torch or ground cable on the welding machine or other electric
equipment.
Welding fumes
• Ensure proper ventilation and avoid inhaling the fumes.
• Ensure sufcient supply of fresh air, particularly in closed spaces. You can also ensure the
supply of clean and sufcient breathing air by using a fresh-air mask.
• Take extra precautions when working on metals or surface-treated materials containing lead,
cadmium, zinc, mercury or beryllium.

Mastertig MLs™ 2300 aDCD / 0743 – 5© keMppi oy
Transportation, lifting and suspension
• Never pull or lift the machine by the welding torch or other cables. Always use the lift points
or handles designed for that purpose.
• Only use a transport unit designed for the equipment.
• Try to transport the machine in an upright position, if possible.
• Never lift a gas cylinder and the welding machine at the same time. There are separate
provisions for gas cylinder transportation.
• Never use a welding machine when suspended unless the suspension device has been designed
and approved for that particular purpose.
• Do not exceed the maximum allowed load of suspension beams or the transportation trolley
of welding equipment.
• It is recommended that the wire coil be removed during lifting or transportation.
Environment
• Protect welding machines from heavy rain and direct sunshine even if it were suitable for
outdoor use.
• Always store the machine in a dry and clean space.
• Protect the machine from sand and dust during use and in storage.
• The recommended operating temperature range is -20 to +40 °C. The machine’s operation
efciency decreases and it becomes more prone to damage if used in temperatures in excess
of 40 °C.
• Place the machine so that it is not exposed to hot surfaces, sparks or spatter.
• Make sure the airow to and from the machine is unrestricted.
• This electromagnetic compatibility (EMC) of professional equipment is usually designed for
industrial use. Such class-A equipment is not intended for use in residential locations where
the electrical power is provided by the public low-voltage supply system. The machine may
interfere with sensitive home electronic devices.
Gas bottles and pneumatic devices
• Adhere to the instructions for handling pneumatic devices and gas bottles.
• Make sure that gas bottles are used and stored in properly ventilated spaces. A leaking gas
bottle may replace the oxygen in the inhaled air, causing suffocation.
• Before use, make sure that the gas bottle contains gas suitable for the intended purpose.
• Always x the gas cylinder securely in an upright position, against a cylinder wall rack or
purpose-made cylinder cart.
• Never move a protective gas bottle when the ow adjuster is in place. Put the valve cover
in place during transportation.
• Close the cylinder valve after use.

6 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
1
2
1
2
3
56
4
Front of machine
1. Function panel
2. Remote control connector
3. TIG torch control connector
4. Shield gas and current connector for TIG torch
5. (+) connector for electrode holder
6. (–) connector for earth cable
Markings for (+/–) poles on the machine front are
embossed.
Rear of machine
1. Mains switch
2. Snap connector for gas
2. INSTALLATION
2.1. REMOVAL FROM PACKAGING
The equipment is packed in durable packages designed especially for it. However, it is necessary
to check the equipment before using it to make sure that the equipment or any part of it has not
got damaged during transportation. Also check that the delivery corresponds to your order and
that you have received all necessary instructions for installing and operating the equipment. The
packaging material is recyclable.
2.2. LOCATING THE MACHINE
Place the machine on a horizontal, stable and clean ground. Protect the machine from rain and
direct sunshine. Check that there is enough space for cooling air circulation in front of and behind
the machine.
2.3. SERIAL NUMBER
Serial number of the machine is marked on the rating plate. The serial number is the only proper
means of identifying parts for a specic product. It is important to make correct reference to the
serial number of the product when making repairs or ordering spare parts.
2.4. INSTALLATION AND MAIN PARTS

Mastertig MLs™ 2300 aDCD / 0743 – 7© keMppi oy
1. 2.
TorchInstalling gas-cooled torch Installing water-cooled torch
2.5. INSTALLATION OF THE PANEL
1. Fasten the cable connectors of the function panel to the power source (2 pieces).
2. Place the bottom edge of the panel behind the securing clips on the machine. Remove the
xing pin from the top edge with, for example, a screwdriver. Then gently push the upper
part of the panel into place. Make sure that the cables do not get damaged, continue gently
pushing the upper part of the panel until it clips into place. Finally, push the xing pin back
into its place.
2.6. MAINS CONNECTION
Only an authorised electrician is allowed to install mains cable and plug!
The machine comes equipped with a three-metre power cord with a Schuko plug. Only an authorised
electrician is allowed to replace the plug. The fuse and cable sizes are given in the Technical data
at the end of this manual.
This equipment’s electromagnetic compatibility (EMC) is designed for use in an
industrial environment. Class A equipment is not intended for use in residential location
where the electrical power is provided by the public low-voltage supply system.

8 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
1. 3.2.
2.7. WELDING CABLE CONNECTIONS
The welding cables must be made of at least 16 mm² copper cable.
2.7.1. Choosing welding polarity in MMA welding
You can select the polarity electronically from the control panel, i.e. you do not have to switch the places of
the (+) and (-) connectors. Connect always the negative connector to the work piece.
2.7.2. Earthing
If possible, always fasten the earth clamp of return current cable directly onto work piece.
1. Clean contact surface of earth clamp from paint and rust.
2. Fasten clamp properly, so that contact surface is as large as possible.
3. Check that clamp is fastened rmly.
2.8. COOLING UNIT TO MASTERCOOL 20
Cooling liquid is injurious! Avoid also contact with skin or eyes. In case of injury, seek
for medical advice.
Cooling unit Mastercool 20 together with TIG torch Kemppi TTC-W range enables TIG welding
with water-cooled torch.
The cooling unit is installed beneath the power source with screws. Electrical connections are on
the bottom of power source. Fill the reservoir with a 20 – 40 % mixture of glycol and water, or
with any other suitable antifreeze. The capacity of the reservoir is 3 litres.
Mastercool 20 Installation of cooling unit:
Electrical connection
for the cooling unit:
1. 230 V
2. Control connector
3. Equipment earth
Only an authorised
electrician is allowed to
install electrical connection!

Mastertig MLs™ 2300 aDCD / 0743 – 9© keMppi oy
A C F
G
B
E
D
2.9. SHIELD GAS
Handle gas bottle with care. There is a risk for injury if gas bottle or bottle valve is
damaged!
Use inert gases such as argon, helium or argon-helium mixture as shield gas for TIG welding. Make
sure that the gas ow regulator is suitable for the gas type used. The ow rate is set according
to the welding current, joint form and the size of the electrode. A suitable ow rate is normally
8 – 10 l/min. If the gas ow is not suitable the welded joint will be porous. Spark ignition becomes
more difcult if the gas ow is too high. Contact your local Kemppi dealer for choosing gas and
equipment.
Parts of gas ow regulator
A Gas bottle valve
B Pressure regulation screw
C Connecting nut
D Hose spindle
E Jacket nut
F Gas bottle pressure meter
G Gas hose pressure meter
2.9.1. Installation of gas bottle
Always fasten gas bottle properly in vertical position in a special holder on the wall or
on a carriage. Remember to close gas bottle valve after having nished welding.
The following installation instructions are valid for most gas ow regulator types:
1. Step aside and open the bottle valve (A) for a while to blow out possible impurities from
the bottle valve. Note! Watch out for the gas ow.
2. Turn the press regulation screw (B) of the regulator until no spring pressure can be felt.
3. Close needle valve if there is one in the regulator.
4. Install the regulator on bottle valve and tighten connecting nut (C) with a wrench.
5. Install hose spindle (D) and jacket nut (E) into gas hose and tighten with hose clamp.
6. Connect one end of the hose with the regulator and the other end with the power source.
Tighten the jacket nut.
7. Open bottle valve slowly. Gas bottle pressure meter (F) shows the bottle pressure. Note! Do
not use the whole contents of the bottle. The bottle should be lled when the bottle pressure
is 2 bar.
8. Open needle valve if there is one in the regulator.
9. Turn regulation screw (B) until hose pressure meter (G) shows the required ow (or pressure).
When regulating ow amount, the power source should be switched on and the gun switch
pressed simultaneously.
Close bottle valve after having nished welding. If the machine will be out of use for a long time,
unscrew the pressure regulation screw.

10 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
3. OPERATION
Welding in places presenting an immediate re or explosion hazard is forbidden!
Welding fumes may cause injury, take care of sufcient ventilation during welding!
3.1. WELDING PROCESSES
3.1.1. MMA welding
With Mastertig MLS™ ACDC power sources you can use all electrodes suitable for direct and
alternating current welding between current limits of the power source. Both function panels (ACS,
ACX) can be used for electrode welding when MMA welding is selected.
3.1.2. TIG welding Alternating Current
The Mastertig ACDC MLS™ power sources are specially designed for TIG welding aluminium
with alternating current (AC). We recommend using WC20 electrodes (grey) for AC welding.
The table is only given as a guide.
The table and the panel scale are based on the use of WC20 (grey).
3.1.3. TIG Welding with Direct Current
DC welding is typically used when welding different grades of steel. We recommend using WC20
electrodes (grey) for DC welding.
A directive electrode selection table for DC welding.
Welding current range Electrode Gas nozzle Gas ow rate
DC WC20
number ø mm
Argon
A ø mm l/min
5 ...80 1,0 4/5 6,5 / 8,0 5...6
70 ...140 1,6 4 / 5 / 6 6,5 / 8,0 / 9,5 6...7
140 ...230 2,4 6 / 7 9,5 / 11,0 7...8
Welding current range AC Electrode Gas nozzle Gas ow rate
min. min. maks. WC20
ø mm number ø mm
Argon
A A A l/min
15 25 90 1,6 4 / 5 / 6 6,5 / 8,0 / 9,5 6...7
20 30 150 2,4 6 / 7 9,5 / 11,0 7...8
30 45 200 3,2 7 / 8 / 10 11,0 / 12,5 / 16 8...10
40 60 350 4,0 10 / 11 16 / 17,5 10...12

Mastertig MLs™ 2300 aDCD / 0743 – 11© keMppi oy
1 2 3
3.1.4. Synergetic Pulsed TIG welding
The ACX panel includes the synergetic TIG process, in which you only need to adjust the welding
current while other pulse parameters are programmed. Pulsing frequency is high, which guarantees
concentrated arc and increased welding speed.
3.1.5. Long Pulsed TIG welding
This method gives you the possibility to adjust all pulse parameters. Weld pool control is also
easier. Long pulsed TIG welding is included in the ACX panel.
3.1.6. Spot welding function
In spot welding function you can to adjust the duration of the welds in the range 0-10 s.
3.1.7. MicroTack™ function
MicroTack welding is an efcient way to connect thin materials together using low heat input,
which decreases distortions in base material.
3.1.8. TIG-welding with mixed AC-DC current (MIX)
Especially joining materials of different thicknesses can best be made out by using mixed current.
Adjust values with SETUP-function if needed.
3.2. OPERATION FUNCTIONS
3.2.1. Power source
Always switch the machine on and off from main switch. Do not use the mains plug
for switching!
Never watch the arc without a proper face shield designed for arc welding! Protect
yourself and the surroundings against welding arc and hot spatters!
3.2.2. Function panels
Before welding starts, welding settings suitable for the work piece are chosen with the function
panel.
The Kemppi Multi Logic System, MLS™, allows you to select the function panel based on the
purpose of use: the ACS panel for AC TIG welding with basic functions, or the ACX panel with
pulsed TIG, 4T-LOG or MINILOG control of welding current and memory channel functions.
The current display accuracy is 3 % ± 2 A, and the voltage display accuracy is 3 % ± 0.2 V.
3.2.2.1. Indicator lights
1. Power On
2. Thermal overload of power source
3. Wrong mains voltage, over or under-voltage

12 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
1.
4.
5.
6.
8.
9.
7.
11.
10.
3.
2.
12. 13. 14. 15. 16.
17.
3.2.2.2. ACS welding panel – basic functions
1. Selection button and indicators for TIG welding and current type
2. Selection button and indicators for MMA welding and current type
3. Current and voltage display, display for other welding parameters
4. QUICK SETUP button for MMA and TIG adjustments (e.g. balance adjustment)
5. Selection of the torch switch function 2T/4T
6. HF/contact TIG (WATER FILL) button
7. Remote control selection button (setting the limits for the adjustment range: LO/HI)
8. Welding parameter selection buttons (arrow buttons)
9. RETURN button / returns to welding current
10. GAS TEST button
11. Potentiometer for welding parameter adjustment
12. Pre-gas 0.0 - 10.0 s
13. Upslope 0.0 - 10.0 s
14. Hot Start current 100 – 150 % (100 %: not in use)
15. Welding current
16. Downslope 0.0 - 15.0 s
17. Post-gas 1.0 - 30.0 s

Mastertig MLs™ 2300 aDCD / 0743 – 13© keMppi oy
1. MMA
Select MMA welding by pressing the MMA selection button. The indicator light next to the button
will light up when MMA is selected. The current type indicator light indicates which current is
selected: AC, DC-, DC+. Change the current type by pressing the MMA button again, and the
indicator light will indicate the selected current.
Press the QUICK SETUP button if you wish to adjust the dynamics or ignition pulse to MMA
welding. Navigate with the arrow buttons and adjust with the potentiometer. Quit by pressing again
QUICK SETUP- or RETURN-button.
1. Dynamics (“Arc” –9 … 0 … +9)
You will see the numerical value corresponding to the MMA dynamics in the display.
Factory setting for all electrode types is zero. You can change the value by turning the pulse
potentiometer. If numerical value is adjusted negative (-1...-9) the arc is softened, and the
amount of spatter decreases when welding at the upper end of the recommended current
range of the electrode. On the positive side (1...9) the arc is rough.
2. Ignition pulse (Hot –9 … 0 … +9)
You will see on the display the numerical value corresponding to the MMA hot start pulse.
You can adjust the value by turning the potentiometer. A positive value corresponds to a
more powerful pulse, with zero being the default setting.
2. TIG welding
Select TIG welding by pressing the TIG button. You can change the current type by pressing the
selection button again (AC, MIX, DC-, DC+). Selecting DC+ requires holding down the button.
According to selected current mode you can adjust parametres by using QUICK SETUP -funktion.
Quit from QUICK SETUP -function by pressing QUICK SETUP -button. At the same time you
can see recommended diameter for elektrode.
AC TIG (alternating current TIG)
Intended for welding aluminium. You can adjust, for example, the balance and frequency of
the alternating current with the QUICK SETUP and arrow buttons. The following welding
parameters can be adjusted:
1. Balance (bAL -50 … 0, factory setting –25%)
A positive balance value breaks up aluminium oxide more effectively but heats the electrode
more than the workpiece (the tip blunts).
A negative balance value increases heat generation and penetration in the base metal, while
decreasing oxide break-up.
If you wish to increase electrode temperature when welding with a blunt-headed electrode,
adjust the balance in the positive direction, and if you wish to decrease electrode temperature
when welding with a sharp electrode, adjust the balance correspondingly in the negative
direction.
At the factory setting, the electrode tip remains almost sharp.
A sharp electrode allows welding with a narrower arc, achieving a narrower weld and deeper
penetration than with a blunted electrode. Narrow welding is especially useful when llet
welding.
Welding with a blunted electrode produces a wide arc, which also widens the area of oxide
break-up. Application areas include repair welding and casting.

14 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
2. Frequency (FrE 50 … 250 Hz, factory setting 60 Hz)
Raising the frequency will make the arc slightly more stable and narrow, but it will increase
the noise caused by arc.
3. Selection of AC waveform, sine or square wave (SinuS/SquArE)
The waveform affects the noise level and penetration of the arc. A sine waveform generates
a lower noise level, while a square wave has better penetration (factory setting).
4. Hot Start time for the 2T function (H2t 0.1 s…5.0 s, factory setting 1 s)
Pre-heating timer for the 2T switch function. The workpiece can be pre-heated (Hot Start) with
both AC and DC currents. The time set here remains in effect for DC TIG current types.
3. MIX TIG (mixed current AC/DC-)
With mixed current frequency and balance of alternating current are determined by adjustments
made for AC-current. Adjust by choosing sections 4. – 5. if needed.
The following QUICK SETUP parameters can be adjusted:
1. AC-time (AC 10 ... 90 %, factory setting 50 %)
2. Cycle time (CYc 0.1 ... 1.0 s, factory setting 0.6 s)
3. DC-current (DC(-) 50 ... 150 %, factory setting 100 %)
4. Balance (bAL -50 … 0 … +10 %, factory setting –25 %)
5. Frequency (FrE 50 … 250 Hz, factory setting 60 Hz)
6. Selection of AC waveform, sine or square wave (SinuS/SquArE)
7. Hot Start time for the 2T function (H2t 0.1 s…5.0 s, factory setting 1.0 s). Can be seen only on the
2T function.
Factory setting is marked with a dot after the numeric value.
Growing DC-current increases penetration but decreases cleaning effect.
4. DC- (or DC+) (direct current)
No parameters to adjust. You can see recommended diameter for elektrode by pressing QUICK
SETUP -button. Diameter depends on current adjustment.

Mastertig MLs™ 2300 aDCD / 0743 – 15© keMppi oy
HF/contact ignition in TIG welding (water ll)
TIG arc can be started either with high frequency (HF) or without (contact ignition). HF ignition
is chosen by pressing the HF CONTACT button to turn on the HF light.
If you use water-cooled torch you can ll it with water by pressing the HF CONTACT button for
more than 2 seconds. The display reads ’COOLER’.
Welding torch switch 2 sequence function
Gas ow starts when the torch switch is pressed. Welding starts, and the current will rise to the Hot
Start current within the up-slope time, remain at that level for the set time (H2t) and then change
to the welding current. The Hot Start function can be disabled and green panel light switches off
when the Hot Start current is adjusted to 100 %. The current will then rise directly to the welding
current level within the up-slope time. Release the torch switch, and the current starts to drop,
and after the selected down-slope time the arc is broken. After this, the shield gas will ow for
the time selected.
Welding torch switch 4 sequence function
Gas ow starts when the torch switch is pressed. Release the torch switch. The ignition spark
ignites the arc, and the current will rise to the Hot Start current within the up-slope time. You can
switch from Hot Start current to welding current with a short press of the torch switch. You can
disable the Hot Start function by adjusting the Hot Start current to zero per cent. The current will
then rise directly to the welding current level within the up-slope time.
Press the torch switch down, and the welding continues. Release the torch switch, and the current
starts to drop and after the selected down-slope time the arc is broken. After this, the shield gas
will ow for the time selected.
Remote control
If you choose to adjust the welding current with a remote control unit you need to connect the unit
and select the remote control selection button. The PANEL light switches off, and you can select
the unit (R10, foot pedal control R11F, or torch control). The foot pedal control works only in 2T
mode. Hold the remote control selection button (LO/HI) down to adjust the limits of the remote
control’s adjustment range.
Adjustment of parameters
To select TIG welding parameters you only need to use two buttons: arrow-left and arrow-right.
Red panel light shows parameter you have chosen. Adjustment is done with the potentiometer.
When pressing the RETURN button, adjustment of parameters goes straight to welding current.
The display shows automatically numeric values and the units of the parameters. When you adjust
the parameters, you can see the value on the numerical display. After 10 seconds, the display will
return to the welding current.

16 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
2.
1.
3. 4. 7. 8.
9.
11.
5.
10.
6. 12. 13. 14.
3.2.2.3. Welding panel ACX
– pulsed TIG and MINILOG function with memory
1. 4T-LOG and MINILOG function selections
2. Search arc 5 – 90 % of welding current
3. Start-current 80 – 150 %
4. Minilog-current 10 – 150 % of welding current
5. Tail arc 5 – 90 % of welding current
6. Selection for spot, synergetic quick pulse and long pulse
7. Spot time 0,0 – 10,0 s
8. Pulse current 10 A – power source max.
9. Pulse ratio 10 – 70 % of pulse time
10. Frequency 0.2 – 250 Hz DC-TIG, 0.2 – 20 Hz AC-TIG
11. Base current 10 – 70 % of pulse current
12. MEMORY, memory function
13. Selection of channel in memory function
14. SAVE/memory values
If wanted in SETUP-function you can disable search arc and tail arc functions. Hot Start (Soft
Start)- and Minilog -currents can be disabled by adjusting the values to 100 per cent (the same as
the welding current).

Mastertig MLs™ 2300 aDCD / 0743 – 17© keMppi oy
Minilog
When torch switch is pressed gas ow starts. When you release the torch switch current goes through
upslope to Hot Start or Soft Start -current depending on adjustments and by pressing shortly again
to welding current. After another short press it goes to Minilog operation, and you can select from
two current levels: the welding current and the Minilog current. You can move from one to the
other by quickly pressing the torch switch. Press the torch switch for one second, release it and
current goes to downslope and tail arc. Arc is cut by short press of the switch.
4T-LOG
When torch switch is pressed current goes to search arc; after the switch is released current goes
to welding current within the upslope time. When the switch is pressed again, current goes to
downslope and then to the tail arc. Current stops when the switch is released.
Synergetic quick pulse
Press the PULSE button twice and the synergetic light turns on. Pulse parameters are calculated
automatically when average welding current is selected. Other pulse selections are not
necessary.
Long pulse
Long pulse method gives you the possibility to adjust all pulse parameters (pulsing frequency,
pulse ratio, pulse current and pause current). You can also adjust the welding current, in which case
you receive a new pulse current value. Pulse ratio and pause current percentage remain constant.
When you adjust the pulse ratio, pulse current or pause current, the new average welding current
value is shown on the display.
Spot welding function
The function can be used both in 2T and 4T mode. Enter the spot duration by pressing arrow button, and
when the led is lit you can choose the spot time needed by turning the pulse potentiometer.
TIG -Micro tack welding function (MicroTack™)
You can select the Micro Tack function with a long press of the SPOT arrow button. When this function is
activated, the machine automatically enables the DC- welding mode, 2T switch mode and contact ignition.
Also the upslope and downslope values are set to zero and SPOT led starts to blink. To inactivate the Micro
Tack you press briey the same arrow button.
This function can be used with HF ignition and 4T mode. The duration of the spot weld can be adjusted by
pressing Quick Setup button and selecting a value in the range 1-200 ms. The Micro Tack welding current
can be adjusted with the control knob, when the welding current led is on.
3.2.3. Saving welding settings
ACX panel has 10 memory channels for user settings. The selections are made in the MEMORY
eld. Not only welding parameters but also function selections can be saved in the memory. MMA
welding values can also be stored in memory channels. Proceed as follows:
1. Press MEMORY button and if the SET light starts blinking the channel is free. If a channel is
in use, the ON light will light up. Press again, and the SET light will be continuously lit.
2. Select memory channel by pressing CH button.
3. Select the parameters and press SAVE button.
4. Press MEMORY button twice. ON led is lit.
5. Start welding.
If the saved settings need to be adjusted the led has to be moved from ON to SET position in order
to select parameters. Press the SAVE button.
When the memory function is in OFF state (no lights on) it is also possible to save the currently used
panel parameters by pressing SET/SAVE, by choosing channel ja by pressing SET/SAVE again.
Channel is cleared if MEMORY and CH buttons are pressed simultaneously in SET mode.

18 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
3.2.4. Adopting the saved settings
1. Select MEMORY by pressing the button.
2. Select memory channel by pressing the CH button.
3. Start welding.
3.2.5. Remote control memory channels
Memory channels are selected by pressing simultaneously both REMOTE and CH button. With
the remote control you can retrieve saved settings on memory channels 1-5. The selected channel
is marked with a dot.
3.2.6. SETUP functions
A so called SETUP state is included for modifying panel functions. You can enter the SETUP state
by pressing the SETUP button longer than normally. Exit is performed in the same way. You can
select the function (see list below) by pressing the arrow buttons and then change the setting by
turning the potentiometer. See SETUP-function table on the next page.
3.2.7. Foot pedal control R11F
First read under 3.2.2.2. ”ACS Welding Panel – Basic Functions” point ”Remote control” for
installing the remote control ready for operation. Foot pedal R11F is used in TIG welding, and its
control range is adjustable. The minimum value of control range is set with the panel potentiometer
when the pedal is not pressed, display shows ”LO”. Control range maximum is set similarly by
pressing rst the PEDAL LO/HI button on the panel, display shows ”HI”. Welding is started with
a light press on the pedal, the arc ignites to the set minimum current. Welding current goes to
maximum when the pedal is pressed to the bottom. The arc is broken when the pedal is released.
Adjust again if necessary.
3.3. COOLING UNIT OPERATION MASTERCOOL 20
The operation of Mastercool cooling unit is controlled by the power source. The cooling unit pump
starts automatically when welding starts. Proceed as follows:
1. Start power source.
2. Check water level and input ow of the reservoir, add liquid if needed.
3. If you use a water-cooled torch you can ll it with water by pressing WATER FILL button
for more than 2 seconds.
The pump operates for 4 another minutes after welding has been nished to cool the water to the
same temperature as in the machine surrounds. This reduces the need of service.
Thermal overload
The thermal overload light is lit, the machine stops and display shows COOLER when temperature
control of the machine has detected cooling water overheating. The cooling unit fan cools down
the water, and when the light goes out welding can be started again.
Water ow signal
Display shows COOLER when water ow is blocked.
3.4. STORAGE
The machine must be stored in a clean and dry room. Protect the machine from rain and direct
sunshine in places where temperature exceeds +25 °C.

Mastertig MLs™ 2300 aDCD / 0743 – 19© keMppi oy
SETUP-function Display
*C = Common: applies to all memory
channels
Factory setting with a grey background
Upslope current
dependency (*C)
A1 ON The upslope time is determined by the current.
OFF The upslope time remains as set.
Downslope current
dependency (*C)
A2 ON The downslope time is determined by the
current (the user may set the slope gradient).
OFF The downslope time remains as set.
TIG Antifreeze (*C) A3 ON TIG Antifreeze on.
OFF TIG Antifreeze off.
MMA Antifreeze (*C) A4 ON MMA Antifreeze on.
OFF MMA Antifreeze off.
VRD (*C) A7 ON VRD mode: idle voltage < 35 V
OFF Normal idle voltage
2T downslope cut off A8 ON In 2T mode, cut off the downslope with a quick
push of the start button.
OFF Quick push has no effect.
Tacking automatics A9 ON If welding has lasted less than 3 seconds, no
downslope when welding is stopped.
OFF Tacking automatics off.
Limitation of rate of current
rise with high currents
A10 ON If the current is over 100 A and UpSlope is 0.0
sec., there is a 0.2-second slope from half the
welding current.
OFF Current rises directly to maximum.
MMA/TIG method selection
with remote control (C*)
A12 ON TIG = the start of remote control scale.
MMA = the end of the scale.
OFF Remote control as a normal current regulator.
SearchArc On/Off A13 ON SearchArc on.
OFF SearchArc off.
Current freeze function A14 ON During the downslope, the current can be
‘frozen’ at a certain level by pushing the start
button.
OFF Freeze function off.
Memory channel selection
with Up/Down buttons (C*)
A15 ON The Plus/Minus buttons on the remote control
can be used to select the memory channel.
OFF The buttons adjust the current.
Activation of the Plus/Minus
buttons (C*)
A16 ON The Plus/Minus remote control is always active.
OFF The Plus/Minus remote control is active only
when selected by pressing the REMOTE button.
Water cooler ow guard (C*) A17 ON Flow guard on.
OFF Flow guard off.
Water cooler automatic
control (C*)
A19 ON Automatic control on.
OFF Water cooler runs constantly.
Water cooler temperature
guard (C*)
A20 ON Water cooler temperature guard selected.
OFF Temperature guard off.
Automatic remote control
device recognition (C*)
A21 ON Automatic recocnition on, control cannot be
selected if it is not connected.
OFF Automatic recocnition On/Off. Controller can be
selected even if it is not connected.
Tail arc A22 ON* Tail arc on. * 4T LOG
OFF** Tail arc off. ** MINILOG

20 – Mastertig MLs™ 2300 aCDC / 0743 © keMppi oy
3.5. ERROR CODES
The machine always checks its operation automatically during start-up and reports any failures
detected. If failures are detected during start-up, they are shown as error codes on the control panel
display.
Err3: Overvoltage or undervoltage
The machine has stopped the welding because it has detected momentary voltage spikes or
continuous mains over- or under-voltage dangerous to the machine. Check the quality of the
supply network.
Err4: Power source overheating
The power source has overheated. The cause may be one of the following:
• The power source has been used for a long time at maximum power.
• The circulation of cooling air to the power source is blocked.
• The cooling system has experienced a failure.
Remove any obstacle to air circulation, and wait until the power source fan has cooled down the
machine.
4. MAINTENANCE
Watch out for mains voltage when handling electric cables!
Degree and circumstances of machine utilisation should be taken into consideration when planning
product maintenance. Careful use and preventive maintenance help to avoid unnecessary production
disturbances and breaks. Check the condition of the welding and connection cables daily. Do not
use damaged cables.
4.1. REGULAR MAINTENANCE
4.1.1. Every sixth months
NOTE! Disconnect the plug of the machine from the mains socket and wait for ca. 2 minutes
(capacitor charge) before removing the casing plate.
The following maintenance operations should be carried out at least every sixth months:
• Electric connections of the machine - clean any oxidised parts and tighten any loose
ones. NOTE! You must know the correct tension torques before you start repairing the
connections.
• Clean the inner parts of the machine from dust and dirt e.g. with a soft brush and a vacuum
cleaner. Do not use compressed air because there is the danger that the dirt is packed even
more tightly in the gaps of the cooling proles. Do not use a pressure washer.
Only an authorised electrician may repair the machine.
4.1.2. Service contract
KEMPPI service workshops make special service contracts with customers about regular
maintenance. All parts are cleaned, checked and if necessary, repaired. Also the operation of
welding machine is tested.