Kemppi MasterTig LT 250 Bedienungsanleitung

MasterTig

LT 250

Operating manual

Bruksanvisning

Gebrauchsanweisung

Manual de instrucciones

Käyttöohje

Manuel d’utilisation

Manuale d’uso

Gebruiksaanwijzing

Brugsanvisning

Instrukcja obsługi

Manual de utilização

Инструкции по эксплуатации

Bruksanvisning

操作手册

OPERATING MANUAL

English

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

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.

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.

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.

MasterTig LT 250

2.5 General view of the machine

10.

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.

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.

2.6 Welding cable connections

Connect parent power source

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

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.

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.

MasterTig LT 250

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