Kemppi LT 250 User Manual

MasterTig
LT 250
Operating manual
Bruksanvisning
Gebrauchsanweisung
Manual de instrucciones
Käyttöohje
Manuel d’utilisation
Gebruiksaanwijzing
Brugsanvisning
Instrukcja obsługi
Manual de utilização
EN
DA
DE
ES
FI
FR
IT
NL
NO
PL
PT
Инструкции по эксплуатации
Bruksanvisning
操作手册
RU
SV
ZH
OPERATING MANUAL
English
EN
CONTENTS
1. Preface ........................................................................................................... 3
1.1 General ....................................................................................................................................... 3
1.2 Product introduction ............................................................................................................ 3
2. Before you start using the unit ............................................................... 4
2.1 Unpacking ................................................................................................................................. 4
2.2 Positioning and location of the machine ...................................................................... 4
2.3 Power supply connection.................................................................................................... 4
2.4 Serial number ........................................................................................................................... 4
2.5 General view of the machine ............................................................................................. 5
2.6 Welding cable connections ................................................................................................ 6
3. Use .................................................................................................................. 7
3.1 TIG welding ............................................................................................................................... 7
3.2 Shielding gas ............................................................................................................................ 8
3.3 Connection for MMA welding ........................................................................................... 9
3.4 Operating functions ............................................................................................................10
3.4.1 Welding current regulation and remote control .........................................................10
3.4.2 MMA welding settings ..................................................................................................10
3.4.3 TIG welding function .....................................................................................................11
4. Setup features ........................................................................................... 12
5. Error codes ................................................................................................. 13
5.1 Troubleshooting ...................................................................................................................13
6. Maintenance .............................................................................................. 14
6.1 Daily maintenance ...............................................................................................................14
6.2 Storage .....................................................................................................................................14
6.3 Disposal of the machine ....................................................................................................14
7. Ordering numbers .................................................................................... 15
8. Technical data ............................................................................................16
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MasterTig LT 250
1. PREFACE
1.1 General
Congratulations on choosing the MasterTig LT 250 equipment. Used correctly, Kemppi products can signicantly increase the productivity of your welding and provide years of economical service.
This operating manual contains important information on the use, maintenance and safety of your Kemppi product. The technical specications of the equipment can be found at the end of the manual.
Please read the manual carefully before using the equipment for the rst time. For your own safety and that of your working environment, pay particular attention to the safety instructions in the manual.
For more information on Kemppi products, contact Kemppi Oy, consult an authorised Kemppi dealer, or visit the Kemppi web site at www.kemppi.com.
The specications presented in this manual are subject to change without prior notice.
Important notes
Items in the manual that require particular attention in order to minimise damage and personal harm are indicated with the ’NOTE!’ notation. Read these sections carefully and follow their instructions.
Disclaimer
While every eort has been made to ensure that the information contained in this guide is accurate and complete, no liability can be accepted for any errors or omissions. Kemppi reserves the right to change the specication of the product described at any time without prior notice. Do not copy, record, reproduce or transmit the contents of this guide without prior permission from Kemppi.
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1.2 Product introduction
MasterTig LT 250 is a high quality DC TIG and MMA welding source for industrial applications. MasterTig LT 250 requires no mains input voltage supply and is powered from the supply voltage provided by a parent power source. See item 2.3.
Before using or doing any maintenance work on the machine, read the operating manual and keep it for further reference.
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2. BEFORE YOU START USING THE UNIT
NOTE! Please read the separate safety instruction booklet provided before you commence welding. Pay
particular attention to the risks associated with re and explosion.
2.1 Unpacking
Always before using the equipment, make sure it was not damaged during transportation. Also check that you have received what you ordered and that there are instructions for it.
The packaging material of the products is suitable for recycling.
Transportation
The machine should be transported in an upright position.
NOTE! Always move the welding machine by lifting it from the handle. Never pull it from the welding
torch or other cables.
Environment
The machine is suitable for both indoor and outdoor use, but it should be protected from rain and sunshine. Store the machine in a dry and clean environment and protect it from sand and dust during use and storage. The recommended operating temperature range is -20 °C – +40 °C. Place the machine in such a way that it does not come in contact with hot surfaces, sparks and spatters. Make sure the air ow in the machine is unrestricted.
2.2 Positioning and location of the machine
Place the machine on a rm, dry and level surface. Where possible, do not allow dust or other impurities to enter the machines cooling air ow. Preferably site the machine above oor level; for example on a suitable carriage unit.
Notes for positioning the machine
• The surface inclination should not exceed 15 degrees.
• Ensure the free circulation of the cooling air. There must be at least 20 cm of free space in
front of and behind the machine for cooling air to circulate.
• Protect the machine against heavy rain and direct sunshine.
NOTE! The machine should not be operated in the rain as the protection class of the machine, IP23S,
allows for outside preserving and storage only.
NOTE! Never use a wet welding machine.
NOTE! Never aim metallic grinding spray/sparks towards the equipment.
2.3 Power supply connection
MasterTig LT 250 requires no mains input voltage supply and is powered by the supply output voltage from a parent welding power source. You can use either a Constant Current (CC) or Constant Voltage (CV) parent power source normally used for MMA or MIG/MAG welding, or a welding generator with a suitable output characteristic.
NOTE! The performance of the parent power source can limit the maximum output of MasterTig LT 250.
2.4 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.
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MasterTig LT 250
2.5 General view of the machine
7.
1.
2.
3.
4.
5.6.
Front of machine
1. Control 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.
8.
9.
10.
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Rear of machine
7. ON/OFF switch
8. Snap connector for gas
9. Shielding gas ow meter
10. Welding cables connectors from parent source
NOTE! MasterTig LT 250 is polarity protected. If the +/- power cables are connected in reverse the
machine will not function. This is evident by no power to the control panel.
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2.6 Welding cable connections
Connect parent power source
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NOTE! LT 250 may be powered from a variety of parent welding power supply sources, providing the
output voltage is 40 – 100 volts DC. Inadequate supply voltage will result in limited performance or failure to operate. Always connect both plus and minus welding cables from parent power source to LT 250 to avoid risk of malfunctioning or hazard.
Connect TIG torch
6
The welding torch is used to supply shielding gas and electrical arc energy to the weld piece. When you press the welding torch switch, the shielding gas begins to ow and the arc is established. The TIG torch is connected as shown.
Earth return cable
Connect the earth return cable to the positive pole in TIG welding and to the negative pole in MMA welding.
Before you start welding, clean the work piece surface and x the earth return clamp to the work piece in order to create a closed and interference free welding circuit.
MasterTig LT 250
3. USE
NOTE! Welding fumes may be dangerous to your health. Ensure that there is ample ventilation during
welding! Never look at the arc without a face shield specically designed for arc welding! Protect yourself and your surrounding area from the arc and hot welding spatter!
Prepare to weld
NOTE! Always wear protective clothing, gloves, face and eye shields suitable for welding. It is
recommended that you make practice welds before you commence welding your main work piece. If when igniting the arc or during welding, the electrode stick’s or freezes’ to the work piece, note that it will quickly heat up, and may start to glow red hot. To release the electrode, twist the electrode holder away from the work piece and start again. If this fails, switch o the machine at the main switch and then release the electrode after it has cooled down.
NOTE! The electrode and work piece will be very hot. Protect yourself and others at all times.
You can start welding after you have made the necessary preparation described throughout these instructions.
3.1 TIG welding
TIG welding electrodes and gas nozzles
In DC TIG welding we recommend the use of the WC20 (grey) type electrode, however other types are available.
The welding electrode size (diameter) is selected depending on the welding current/power to be used. An electrode with an insucient diameter compared to the welding current will melt, while excessive electrode size will make it more dicult to ignite the arc.
Generally speaking, a 1.6 mm tungsten electrode will cover currents up to 150 A, and 2.4 mm tungsten electrode up to 250 A DC current.
Before use, grind the tungsten electrode to a sharp point at approximately 1.5 times the diameter of the electrode. If the electrode touches the work piece during welding, re-sharpen the electrode.
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3.2 Shielding gas
In TIG welding, shielding gas is used to prevent atmospheric contamination of the molten weld pool. Normally, the shielding gas is argon (Ar), and the gas ow rate is approximately 8 – 12 litres per minute, but this can vary according to the welding current used and the size of gas nozzle.
The machine is delivered with a 4.5 m long shielding gas hose. Connect the supplied female snap connector of the shielding gas hose to the machine’s male hose connector, max. connection pressure 500 kPa (5 bar). Connect the free end of the shielding gas hose to the gas bottle, via a suitable and approved single stage regulator valve, where outlet ow rates can be adjusted.
NOTE! Never attempt to connect directly to a compressed gas cylinder. Always use an approved and
tested regulator and ow meter.
Connecting the gas hose to a typical welding regulator control valve
1. Connect the supplied shielding gas hose to machine and via a suitable coupling to the gas regulator control valve outlet and tighten the connector.
2. Open the valve of the bottle.
3. Measure the ow.
4. Adjust the ow by the knob (8 – 12 l/min).
NOTE! Use a suitable shielding gas for the welding application. Always secure the gas cylinder in an
upright position with either a specially made wall rack or cylinder trolley. Always close the cylinder valve after welding.
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MasterTig LT 250
3.3 Connection for MMA welding
Electrode holder and earth clamp
In MMA welding, the welding electrodes must be connected to the correct pole. Normally, the electrode holder is connected to the positive and the earthing cable to the negative connector.
It is also important to properly adjust the welding current so that the ller material and coating will melt properly and the welding is ecient. The table below presents the electrode sizes available for use with the MasterTig LT 250 welding machine and the corresponding welding current values.
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MMA Electrodes and corresponding current settings range
Electrode diameter 1.6 mm 2.0 mm 2.5 mm 3.25 mm 4.0 mm 5.0 mm
Fe-Rutile 30 – 60 A 40 – 80 A 50 – 110 A 80 – 150 A 120 – 210 150 – 250 A Fe-Basic 30 – 55 A 50 – 80 A 80 – 110 A 110 – 150 A 140 – 200 200 – 250 A
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3.4 Operating functions
2.
1.
10.
9.
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3.
4.
5. 6. 7.
1. Machine ’ON’ green light
2. Pre/Post gas, upslope/downslope and main current parameter indicator.
3. Welding parameter selector arrow keys.
4. Welding process selection button (MMA or TIG).
5. 2T or 4T TIG torch switch selection button. Select 2T for short welds or 4T for long welds.
6. Ignition method selection button.
7. Current adjustment selector: panel control, TIG Torch remote or foot pedal or hand remote.
8. Welding current and parameter value control knob.
9. Welding current and parameter value display: time and amperes.
10. Overheating indicator.
Switching the machine on
When you power on the machine, the green standby indicator and panel are lit. Make sure that there is enough space around the machine to allow the air to freely circulate and ow into and out o the machine. If the supply cables at the back of the LT 250 are connected in reverse order the machine will not work and the panel will not illuminate.
8.
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3.4.1 Welding current regulation and remote control
The welding current can be adjusted steplessly with the control knob, if panel adjustment (PANEL) is selected.
If you want to adjust the welding current with the remote control, connect the remote control to the machine and then select remote control with selector (7). The following remote control options are available: RTC10, RTC20, R10 and R11F. The remote foot pedal R11F can only be used with TIG welding in 2T operation mode.
3.4.2 MMA welding settings
MMA welding is selected when the indicator next to the MMA symbol is lit. If needed, press the process selection button to select the MMA process (4). The machine automatically sets suitable values to the ignition time, ignition pulse and arc dynamics.
MasterTig LT 250
3.4.3 TIG welding function
W006859
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Select the TIG welding process by pressing the MMA/TIG button.
Torch switch control in 2T mode and HF arc ignition
W006859
The shielding gas starts to ow when the torch switch is pressed and the welding arc is established automatically via HF ignition. The current starts to rise (if an upslope time is established) to the set welding current level. When you release the switch, the current starts to decrease. After the specied downslope time, the arc is disconnected and the set post-gas time begins.
Torch switch control in 4T mode and HF arc ignition
The shielding gas starts to ow when the torch switch is pressed. When the switch is released, the arc is automatically established via HF ignition. The current starts to rise (if an upslope time is established) to the set welding current level. When ready to end the welding cycle, press and release the torch switch again. The welding current starts to drop (if a downslope time is established) until the arc is extinguished and the set post-gas time begins.
HF or Contact ignition
W006859
The TIG arc can be established with or without an HF pulse. If the HF indicator is not lit, the arc can be established by lightly contacting the tungsten electrode
to the work piece. Press the torch trigger and then quickly lift the contact of the tungsten electrode from the work piece (2T function); the arc is established simultaneously and eectively.
For HF ignition, press the HF button so that the indicator is on (item 6). Press the TIG torch trigger and hold or release, depending on whether 2T or 4T is selected. The shielding gas ows and the HF (High Frequency arc) ignites the welding arc.
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Setting parameters
W006859
Select the welding parameters with the arrow keys (3) and adjust the parameter values with the control knob (8). When setting the parameters, the display (9) will show the parameter being adjusted as well as the numeric value that will be set for it. After three seconds, the display returns to normal state and shows the welding current value.
4. SETUP FEATURES
Conguring additional features
The machine has additional features that can be selected and adjusted with the SETUP feature. To activate and deactivate it, press both arrow buttons (3) simultaneously for at least 5 seconds.
In the SETUP mode, the display will show the name of the parameter to be adjusted and its numerical value. Select the parameter to be adjusted with the arrow buttons and change the parameter value with the control knob. The following parameters and values are available:
Name displayed
A 1/0 0 End current level selection, 1 = I min. / 0 = 15 % C 1/0 0 Forced stop during downslope with a brief pressing of the switch,
d 0/5 0 0 =Standard 4T switching logic / 5 = PROTIG TL switching logic E 5 % – 40 % 20 % Upslope start current level selection (% of the welding current) F 1/0 0 Restore factory settings *), 1 = Restore / 0 = No restore h 0.0 – 2.0 s 0 Minimum setting for pre-gas time J 0 – 10 s 1 s Minumum setting for post-gas time L 5 – 20 s 10 s Maximum setting for pre-gas time o 15 – 99 s 30 s Maximum setting for post-gas time S -3...5 0 Arc dynamics (Arc Force) t -9...0 0 Electrode ignition pulse (-9 = No pulse / 0 = Max pulse) U 1/0 0 Disable automatic remote control recognition. 0 = Enable automatic
*) Happens when exiting SETUP mode and value is 1.
Parameter values
Factory setting
Description
1 = On / 0 = O
recognition, 1 = Disable automatic recognition.
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MasterTig LT 250
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.
Error 4: 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.
Other error codes:
The machine can show codes not listed here. In the event of an unlisted code appearing, contact an authorised Kemppi service agent and report the error code shown.
5.1 Troubleshooting
Problem Cause
Panel display does not light. • Check parent power supply is functioning
• Check parent power supply is connected
• Check parent power supply cable connectors are correct and secure.
Poor welding results. Several factors aect the welding quality.
• Ensure that the parent power source is set to full power and that the voltage exceeds the minimum supply voltage level of 40 volts. (Inadequate supply voltage will result in an unstable power delivery or poor ignition).
• Ensure that the welding current selected is adequate for the selected electrode type and size.
• Ensure the cable connections are correct and secure.
• Ensure the process selection is correct.
• Check that the earth return clamp connection area is clean and that the cable and
clamp are not damaged.
• For TIG welding, check that the shielding gas ow is switched on and set correctly.
Poor ignition and arc quality in TIG welding may be a result of a poorly prepared tungsten electrode. Always maintain and grind a point on the TIG torch electrode tip before welding.
Overheating indicator is illuminated. Normally, this indicates that the device has reached its maximum designed operating
temperature. The thermostat has become active, switching the welding power o. Allow the unit to cool and the machine will soon automatically reset and allow welding to re-start.
• Ensure that cooling air has unrestricted ow.
• If the machine’s duty cycle has been exceeded, wait for indicator to turn o.
In certain circumstances, this light may also indicate irregularity in the supply voltage. Too low or high supply voltage.
If the machine’s malfunction is not eliminated with the above measures, contact Kemppi service.
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© Kemppi Oy / 1422
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EN
6. MAINTENANCE
All electromechanical devices require routine service maintenance depending on usage. This type of routine maintenance will prevent hazards and malfunctions.
We recommend that you schedule a service inspection of your welding machine every six months. An authorised Kemppi service agent will inspect and clean your machine, ensuring that all power connections are tight and secure. Power connections can become loose and oxidised with frequent and high changes in temperature.
NOTE! Disconnect the machine from the power supply before handling electric cables.
NOTE! Be careful when handling electric cables!
In maintaining the unit, take into consideration the rate of use and the environment it is used in. When the unit is used properly and serviced regularly, you will avoid unnecessary disturbances in use and production.
6.1 Daily maintenance
Perform the following maintenance daily:
• Clean electrode holder and TIG torch’s gas nozzle. Replace damaged or worn parts.
• Check TIG torch’s electrode. Replace or sharpen, if necessary.
• Check tightness of welding and earth cables connections.
• Check the condition of the parent and welding supply cables and replace damaged cables.
• See that there is enough space around the unit for ventilation.
6.2 Storage
Store the unit in a clean and dry place. Shield it from rain, and in temperatures exceeding +25 °C from direct exposure to sun.
6.3 Disposal of the machine
Do not dispose of electrical equipment with normal waste! In observance of European Directive 2002/96/EC on waste electrical and electronic
equipment, and its implementation in accordance with national law, electrical equipment that has reached the end of its life must be collected separately and taken to an appropriate environmentally responsible recycling facility.
The owner of the equipment is obliged to deliver a decommissioned unit to a regional collection centre, per the instructions of local authorities or a Kemppi representative. By applying this European Directive you will improve the environment and human health.
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MasterTig LT 250
7. ORDERING NUMBERS
Product Part number
Mastertig LT 250 6115100
Cables
Welding cable, 35 mm² 5 m 6184301 Welding cable, 35 mm² 10 m 6184302 Earth return cable, 35 mm² 5 m 6184311 Earth return cable, 35 mm² 10 m 6184312 Extension cable, 35 mm² 5 m 6183305 Extension cable, 35 mm² 10 m 6183310
Torches
TTC 160, 4 m 627016004 TTC 160, 8 m 627016008 TTC 220, 4 m 627022004 TTC 220, 8 m 627022008
Ancillary devices
TIG welding torch controls
RTC 10 6185477 RTC 20 6185478 Gas ow gauge AR/clock 6265136 Shielding gas hose (4.5 m) W001077 Carrying strap 9592160
Remote control units
R 10, length 5 m 6185409 R 10, length 10 m 618540901 R11F 6185407
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© Kemppi Oy / 1422
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EN
8. TECHNICAL DATA
MasterTig LT 250
Connection voltage range
Rated input power
Supply current, I
Supply current, I
Connection cable
Output 40 °C
Welding range
Open circuit voltage
Idle power
Efficiency at 100 % ED
Arc striking voltage
MMA welding electrodes
External dimensions (L × W × H)
Weight
Temperature class
Degree of protection
EMC class
Operating temperature range
Storage temperature range
Standars IEC 60974-1:2012 IEC 60974-10:2007 IEC 60974-3:2007
1max
1eff
DC 40 V – 100 V
8.6 kW/9.1 kVA TIG 155 A MMA 230 A TIG 90 A MMA 135 A
35 mm² TIG 35 % ED 250 A/20 V TIG 60 % ED 200 A/18 V TIG 100 % ED 160 A/16.4 V MMA 35 % ED 250 A/30 V MMA 60 % ED 200 A/28 V MMA 100 % ED 160 A/26.4 V TIG 5 A/1 V – 250 A/35 V MMA 10 A/1 V – 250 A/35 V
90 V TIG 8 W MMA 21 W TIG 80 % MMA 86 %
10 kV
1.6 – 5.0 mm
460 × 180 × 390 mm
12.6 kg
F
IP23S
A
–20 °C … +40 °C
–40 °C … +60 °C
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MasterTig LT 250
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