ESAB MEH 30 User manual

Valid for serial no. 025, 127, 345, 502, 519, 6260469 803 002 020704

MEH 30 Basic

MEH 44 Basic

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Bruksanvisning

Brugsanvisning

Bruksanvisning

Käyttöohjeet

Instruction manual

Betriebsanweisung

Manuel d’instructions

Gebruiksaanwijzing

Instrucciones de uso

Istruzioni per l’uso

Manual de instruções

Ïäçãßåò ÷ñÞóåùò

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Rätt till ändring av specifikationer utan avisering förbehålles.

Ret til ændring af specifikationer uden varsel forbeholdes.

Rett til å endre spesifikasjoner uten varsel forbeholdes.

Oikeudet muutoksiin pidätetään.

Rights reserved to alter specifications without notice.

Änderungen vorbehalten.

Sous réserve de modifications sans avis préalable.

Recht op wijzigingen zonder voorafgaande mededeling voorbehouden.

Reservado el derecho de cambiar las especificaciones sin previo aviso.

Ci riserviamo il diritto di variare le specifiche senza preavviso.

Reservamo--nos o direito de alterar as especificações sem aviso prévio.

Äéáôçñåßôáé ôï äéêáßùìá ôñïðïðïßçóçò ðñïäéáãñáöþí ×ùñßò ðñïåéäïðïßçóç.

SVENSKA 3..............................................

DANSK 11................................................

NORSK 19................................................

SUOMI 27................................................

ENGLISH 35..............................................

DEUTSCH 43.............................................

FRANÇAIS 52.............................................

NEDERLANDS 60.........................................

ESPAÑOL 69..............................................

ITALIANO 78..............................................

PORTUGUÊS 86..........................................

ÅËËÇÍÉÊÁ 95.............................................

ENGLISH

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TOCe

1 DIRECTIVE 36........................................................

2SAFETY 36...........................................................

3 INTRODUCTION 37...................................................

4 TECHNICAL DESCRIPTION 37.........................................

5 INSTALLATION 39....................................................

6 OPERATION 40.......................................................

7 MAINTENANCE 42....................................................

8 ORDERING OF SPARE PARTS 42......................................

DIAGRAM 105............................................................

SPARE PARTS LIST 107...................................................

ACCESSORIES 116.......................................................

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1 DIRECTIVE

DECLARATION OF CONFORMITY

Esab Welding Equipment AB, S--695 81 Laxå, Sweden, declares that Wire feed unit

MEH 30/44 from serial number 626 onwards, conforms to standard EN 60974--1, in

accordance with the requirements of directive (73/23/EEC) and appendix

(93/68/EEC) and standard EN 50199 in accordance with the requirements of direc -

tive (89/336/EEC) and appendix (93/68/EEC).

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Paul Karlsson

Managing Director

Esab Welding Equipment AB

695 81 LAXÅ

SWEDEN Tel: + 46 584 81000 Fax: + 46 584 12336

Laxå 1996--04--20

2SAFETY

WARNING

READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE INSTALLING OR OPERATING.

ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND OTHERS. TAKE PRECAU-

TIONS WHEN WELDING. ASK FOR YOUR EMPLOYER’S SAFETY PRACTICES WHICH SHOULD BE

BASED ON MANUFACTURERS’ HAZARD DATA.

ELECTRIC SHOCK -- Can kill

S Install and earth the welding unit in accordance with applicable standards.

S Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing.

S Insulate yourself from earth and the workpiece.

S Ensure your working stance is safe.

FUMES AND GASES -- Can be dangerous to health

S Keep your head out of the fumes.

S Use ventilation, extraction at the arc, or both, to take fumes and gases away from your breathing zone

and the general area.

ARC RAYS -- Can injure eyes and burn skin.

S Protect your eyes and body. Use the c orrect welding screen and filter lens and wear protective

clothing.

S Protect bystanders with suitable screens or curtains.

FIRE HAZARD

S Sparks (spatter) can cause fire. Make sure therefore that there are no inflammable materials nearby.

NOISE -- Excessive noise can damage hearing

S Protect your ears. Use earmuffs or other hearing protection.

S Warn bystanders of the risk.

MALFUNCTION -- Call for expert assistance in the event of malfunction.

PROTECT YOURSELF AND OTHERS!

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3 INTRODUCTION

The A10 -- MEH 30 and A10 -- MEH 44 are two feed units for MIG/MAG welding

using ESAB’s A10 wire advance system.

Both wire feed units are constructed in the same way and have the same

dimensions, excluding length.

The MEH 44 has been made larger to accomodate a larger wire feed mechanism

and a wire reel with an outer of 44 cm. The MEH 30 will accept wire reels up to 30

cm in diameter. Hence the designation 30 and 44. T he motors are controlled

electronically and are identical on both units, carrying the designation E. The letter M

stands for wire feed unit and H indicates the generation.

The MEH 30 has switches for 2/4 step trigger action and for normal/inch start. T he

MEH 44 also has a switch for reversing the feed motor to make it easier to remove

thicker wires from the welding hose. These controls are located on the dividing panel

behind the lid. The socket for connection of a remote control device is on the front

panel and the r emote control comes into action as soon as it is connected to the wire

feed unit.

For a wire feed unit to be complete it must be equipped either with a turnable,

counterbalance device or a carriage. A turnable or counterbalance device a llow the

wire feed unit to be mounted on a pivot on the power source. A carriage allows the

wire feed unit to be moved easily over the floor or work table.

A wire feed unit and turnable or carriage can also be fitted with a support device and

suspended over the work place.

ESAB’s accessories for the product can be found on page 116.

4 TECHNICAL DESCRIPTION

MEH 30 MEH 44

Length x Breadth x Height,mm 337x326x268 457x326x268

Weight,kg, 13.6 19

Casing

The wire feed unit has a casing of stove enamelled sheet and is divided vertically

into two sections. The first section, covered by a screwed lid, contains the circuit and

solenoid valve.

The second section is open at the r ear and the top and sides are covered by a lid.

The lid is hinged at the top and held by a manually operated catch at the bottom. this

section contains the wire feed mechanism, drive assembly and connection terminals

for the welding hose. Mounted on the dividing panel behind the feed mechanism are

switches for 2/4 step trigger action and for normal/inch start.

The MEH 44 also contains a switch for reversing the wire feed. The potentiometer

for setting the burn--back time can be reached through a hole in the dividing panel.

The wire is shielded from dust and contact by a polyester strip fastened to the rear

edge of the lid. In the baseplate is a grommet through which the welding cable

passes from the power source.

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Wire feed mechanism MEH 30

The wire feed mechanism is driven by a permanent magnet electric motor. The

motor is united to a worm gearbox with a feed roller on the output shaft. The gears

on the feed shaft drive a thrust roller. The wire is advanced by the rollers and power

is received from two driving rollers. Pressure is applied to the wire by a blade

attached to the bracket supporting the thrust r oller.

The blade spring is lever--shaped and allows the thrust roller to be moved out of the

way when changing the wire or cleaning the outlet nozzle. When the thrust roller is

released the same pressure is applied to the wire as before.This pressure can be

adjusted using the knob.

The connection plate on the wire feed unit is used for connecting welding current,

control current, shielding gas, and the wire, all in a single coupling. The wire outlet

nozzle is attached to the connection plate by a locking pin. No tools a re needed to

replace the nozzle. On the connection plate is a power relay which closes when

current flows in the welding circuit.

The feed roller and thrust roller have three grooves for different wire dimensions.

The rollers need not be changed when changing to thicker or thinner wire, just

moved sideways. The positions of the feed roller on the shaft is adjusted using one

or two shims. The thrust roller automatically adjust to the current position in relation

to the feed roller. T he feed mechanism is insulated from the casing.

MEH 44

The feed mechanism in the MEH 44 is largely constructed of the same components

as the MEH 30. T he connection plate, thrust roller and blade spring with adjusting

screw are all identical.

The main difference between the two feed mechanisms is that the MEH 44 has four

driving rollers. Two motors connected in series each drive one feed roller and one

thrust roller.Drive force is divided equally between the two pairs of roller. Any slip due

to differences in the diameters of the rollers is evended out in the motors.

The thrust r ollers are housed in a bogie mounted on a shaft. This is arranged so that

the thrust applied on each pair of rollers is the same. The bogie can easily be

removed once the blade spring is moved to the side. No tools are needed. Between

the two pairs of rollers is an intermediate nozzle that guides the wire. The wire feed

mechanism is insulated from the casing.

Regular equipment

The electronic components are on a circuit card mounted on the dividing panel.

Internal cables are connected to the card by multipin connectors. The control cable

is connected to a bolted terminal.

Turnable

The turnable is attached at the rear of the wire feed unit. It is delivered with an

insulated pivot which can be fitted in a hole on the top of the power source, allowing

the wire feed unit to be swung around as far as the gas bottle.

On top of the turnable is the brake hub for the wire reel. The brake hub can be fitted

in either of two holes for 30 or 44 cm reels.

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Carriage

The carriage has a pair of rubber wheels on a reinforced axle and is fitted to the rear

of the wire feed unit to allow it to be m oved easily. Two castors are included for fitting

under the front panel. The brake hub is mounted on a bracket on the top of the

carriage.

Suspension device

The suspension device is intended to allow the wire feed unit to be hung above the

work place. The device has a large oval hole for a lifting hook or the like and is

bolted to the turnable or carriage along with the brake hub.

Counterbalance device

The purpose of the counterbalance device is to support the welding hose and make

the welder’s job easier. The device is combined with a mast which holds the welding

hose. The mast can be pulled down into a horizontal position or lifted up into a

vertical position by the counterbalance device.

The counterbalance device has a rear section, an arm and a spring assembly. The

rear section is bolted to the casing of the wire feed unit and forms the attachment

point for the spring. T he arm is pivoted on the rear section and has a tube which fits

over the insulated pivot on the power source. The spring, a stiff flat spiral spring, is

attached at its centre to the arm by an adjusting screw.

The brake hub is positioned at the centre of rotion between the rear section and the

arm. This means that the lifting force remains the same whether the reel is full or

empty. The lifting torque can be adjusted by tightening or loosening the adjusting

screw with an allen key. In this way the counterbalance force can be adjusted for

various welding guns. The counterbalance device comes in two versions, one for the

MEH 30 and another for the MEH 44.

Mast

The mast consist of two pressed channels which are joined during assembly and

bolted below the wire feed unit using a clamp. T he spring assembly is fitted to the

top end of the mast and provides a smooth transition for the welding hose as it

leaves the mast. The welding hose is held in place by securing straps.

Since the mast is mounted on the wire feed unit the welding hose has a straight run

from the wire feed unit. This contributes to uniform wire feeding and reduced wear.

5 INSTALLATION

WARNING!

This product is intended for industrial use. In a domestic environment this product may cause radio

interference. It is the user’s responsibility to take adequate precautions.

NOTE!

Connection instruction MEH 44B

When the feed device is connected to equipment

with instruments that show the wire feed speed,

the blue cable R must be connected to B4 and

the red cable S to B5 on the printed circuit board.

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6 OPERATION

General safety regulations for the handling of the equipment can be found on

page 36. Read through before you start using the equipment!

To prevent the reel sliding off the hub: Lock the reel in place by turning

the red knob as shown on the warning label attached next to the hub.

WARNING!

Rotating parts can cause injury, take great care.

There is a risk of tipping if the wire feed unit is fitted with a counterbalance arm. Secure the

equipment, especially if used on an uneven or sloping surface.

Limit the angle of rotation of the wire feed unit using the straps supplied.

When moving the equipment, do NOT pull on the gun.

WARNING!

Connections

Voltage 42 V, 50--60 Hz

Input power 60 W during continuos welding

51 W during intermittent welding

Welding current Welding cable terminal connected to

terminal plate using M10 bolt.

Control connections Cable type LiYY 8x1.5 mm2 with a

23 pin plug connected to circuit card at a

screwed terminal, length 2 m.

Remote control On the front is a 12 pin socket for

connection to a remote control device.

As soon as a r emote control device is

connected it takes over control.

Gas connections Hose nipple, diameter 6 mm.

Welding gun Combined coupling for welding current,

control voltage, shielding gas and electrode.

Drive unit

Permanent magnet DC motor combined with worm gearbox.

Voltage MEH 30, 24 V, MEH 44, 12 V

Output r/min 94 r/m at 150 Ncm load.

Max permissible torque 450 Ncm

Shielding gas valve

2 way, direct action solenoid valve.

Operation Closed if no current to coil

Thread R 1/8”

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Electrical connection Spade connector

Gas pressure Max 1 MPa (10 kp/cm

)

Brake h u b

Designed for the following sizes of wire reel:

Outer diameter ⊘ 300 mm

Hub hole ⊘ 51.5 m m

Hub length 100 mm

Wires MEH30 ø mm MEH44 ø mm

Steel 0,6--1,6 0,8--2,4

Aluminium Grade 18 13 or harder 1,0--1,6 Grade 18 13 or harder 1,0--2,4

Stainless 0,6--1,2 0,8--1,6

Cored wires 0,9--1,6 0,9--2,4

Feed rollers

Four versions of cogged roller are available.

1 for steel, aluminium and stainless 0.6--1.2

2 for steel, aluminium and stainless 1.6--2.4

3 cored wire 1.2--2.0

4 cored wire 2.4

NOTE! A heavy duty (HD) version of r oller is available with a bearing for very heavy

applications.

Nozzles

Nozzles are available for the following wire dimensions.

Inlet nozzles

1 ⊘ 2.0 mm plastic for ⊘ 0,6--1,2 mm wire

2 ⊘ 4.0 mm plastic for ⊘ 1,6--2,4 mm wire

3 ⊘ 2.4 m m steel for ⊘ 1,2--2,0 mm cored wire

4 ⊘ 4.0 m m steel for ⊘ 2,4 mm cored wire (MEH 44)

Intermediate nozzles

1 ⊘ 1.6 mm plastic for ⊘ 0,8--1,2 mm wire

2 ⊘ 4.0 mm plastic for ⊘ 1,6--2,4 mm wire

3 ⊘ 2.4 m m copper for ⊘ 1,2--2,0 mm cored wire

4 ⊘ 4.0 m m copper for ⊘ 2,4 mm cored wire

Outlet nozzles

1 ⊘ 2,0 m m for ⊘ 0,.6--1,6 m m wire

2 ⊘ 3,5 m m for ⊘ 2,0--2,4 mm wire

For combinations of wires, feed rollers and nozzles, see tabel.

Wire feed speed

1.5--25 m /min, fully adjustable.

Accuracy of regulation

Less than 4% deviation from set value at a torque increase of 100--150 Ncm (MEH

30) and 100--200 Ncm (MEH 44).

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7 MAINTENANCE

Regular maintenance is important for safe, reliable operation.

Note!

All guarantee undertakings from the supplier cease to apply if the customer himself

attempts any work in the product during the guarantee period in order to rectify any

faults.

S Cleaning and replacement of the wire feed mechanism’s wear parts should take

place periodically to ensure trouble free wire feed.

S Note that an excessive pressure setting can result in abnormal wear on the pres-

sure roller, feed roller and wire liner.

8 ORDERING OF SPARE PARTS

Spare parts may be ordered through your nearest ESAB dealer, see the last page of

this publication. When ordering, please state product type, serial number, designa-

tion and spare part number in accordance with the spare parts list.

This facilitates d ispatch and ens ures correct delivery.

ESAB MEH 30, MEH 30, MEH 44 Basic, MEH 44 Basic User manual

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