Valid from Serial NO 519 XXX--XXXX
0455 659 001 95.09
MLC 30
101103105107109111102021110025108024042106023061104022041100020040060001
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 9................................................
NORSK 15................................................
SUOMI 21................................................
ENGLISH 27..............................................
DEUTSCH 33.............................................
FRANÇAIS 39.............................................
NEDERLANDS 45.........................................
ESPAÑOL 51..............................................
ITALIANO 57..............................................
PORTUGUÊS 63..........................................
ÅËËÇÍÉÊÁ 69.............................................
ENGLISH
TOCe
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1 DIRECTIVE 28........................................................
2SAFETY 28...........................................................
3 INTRODUCTION 29...................................................
3.1 Technical data 29.............................................................
3.2 TECHNICAL DESCRIPTION 30................................................
3.3 Wire feed unit MLC 30 30......................................................
4 INSTALLATION 31....................................................
5 OPERATION 32.......................................................
6 MAINTENANCE 32....................................................
7 ORDERING OF SPARE PARTS 32......................................
DIAGRAM 75............................................................
SPARE PARTS LIST 76...................................................
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1 DIRECTIVE
DECLARATION OF CONFORMITY
Esab Welding Equipment AB, S--695 81 Laxå, Sweden, declares that Wire feed unit
MLC 30 from serial number 519 onwards, conforms to standard EN 60974--1, in ac-
cordance with the requirements of directive (73/23/EEC) and appendix (93/68/EEC)
and standard EN 50199 in accordance with the requirements of directive
(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 1995--09--18
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 s tance 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 keep fumes and gases from your breathing zone and
the general area.
ARC RAYS -- Can injure eyes and burn skin.
S Protect your eyes and body. Use the correct 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 ear defenders or other hearing protection.
S Warn bystanders of the risk.
MALFUNCTION -- Call for expert assistance in the event of malfunction.
PROTECT YOURSELF AND OTHERS!
GB
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3 INTRODUCTION
The MLC 30 is a component of the A9 semi--automatic series ”push--pull” --system.
This means that a motor driven wire feed unit pushes the wire through the welding
hose to the gun, and from there the compressed air motor in the welding gun pulls
the wire out to the contact tip. The push--pull system ensures smooth, problem--free
wire feed, which is especially important when welding soft consumables such as alu-
minium and thin wires. It also permits the use of welding hoses up to 16 m in length.
It simplifies the work of the welder considerably and extends his working radius,
since the wire feed unit can also be separated from the power source.
Besides the drive motor, the wire feed unit comprises a connecting block for the
welding hose, brake hub for wire reels up to 300 mm in diameter, plus control de-
vices, i.e. solenoid valve for shielding gas, compressed air valve with filter regulator
and current relay.
The wire feed unit can be placed in a variety of positions. If equipped with a counter-
balance and/or turntable the MLC 30 can be made to swivel over the guide journal
on the power source. It can be fitted with a suspension device and suspended over
the work place. It can also be fitted with wheels (carriage) for free--standing use and
easy positioning on the floor or work bench.
MLC 30 is available in two versions for 42 V, 50/60 Hz or 115 V, 50/60 Hz.
3.1 Technical data
Connection data
Continuous A weighted
noise pressure level 58 dB
Voltage 42 V, 50/60 Hz, 115 V, 50/60 Hz (special version)
Power rating 85 VA
Control cable Conductor, type RDO 6x1 mm
2
Gas connection Hose nipple for Æ 6 mm hose
Air connection Coupling för 1/4” hose
Air pressure Max. 500 kPa (5 kg/cm
2
)
W elding current Max. 400 A a t 60 % duty cycle
Wire feed speed Max. 15 m/min. Adjusted at welding gun
Wire diameter Æ 0.6--1 .6 mm
Inlet nozzle Bore Æ 2,7 mm
Outlet nozzle Bore Æ 1,5 mm
Outlet nozzle must be removed with Æ 1,6 mm wire
Brake hub
intended for wire reel with:
External diameter Æ 300 mm
Hub diameter Æ 51.1 mm
Hub length 100 mm
Dimensions
Lxbxh 320x240x255 mm
Weight 10 kg
GB
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3.2 TECHNICAL DESCRIPTION
The MLC’s steel casing is divided vertically into two sections. One section, which is
protected by a screwed panel, contains the electrical and pneumatic regulating
equipment. The other section is covered at the top and side by a hinged panel. In the
closed position the panel is secured to the bottom panel by a snap lock. This section
contains the hub for the wire reel, wire feed mechanism with electric motor and con-
necting block for welding hose, shielding gas and compressed air, plus the gas
valve. In very dirty or dusty locations a reel guard with cover can be fitted to the
brake hub. This accessory is ordered separately. The bottom panel is fitted with a
grommet to allow passage of the welding cable out of the power source.
MLC 30 is fitted with a filter regulator. This drains automatically when the com-
pressed air system is switched off. The pressure is permanently set at 500 kPa
(5 kg/cm
2
).
3.3 Wire feed unit MLC 30
The motor driven wire feed unit is mounted on the output shaft of the electric motor
and comprises a driven feed roller and freewheeling pressure roller. The pressure
roller, which consists of a simple ball bearing, is mounted on a camshaft, which runs
in a needle bearing housed in the casing. Pressure is exerted on the wire by means
of torque applied to the camshaft by an adjustable spring mechanism.
The design of the wire feed unit insulates the welding wire from the outer casing.
The inlet and outlet nozzles are made of hardened steel. When welding with j1.6 mm
wire the outlet nozzle must b e removed from the wire feed unit. On the front panel is
a remote socket (M 26) to allow remote control of voltage. This requires a thyristor
regulated power source, e.g. LAH 315/500 or LUA 400.
IMPORTANT!
To prevent the reel sliding off the hub: Lock the reel in place
by turning the red knob as shown on the warning label atta-
ched next to the hub.
GB
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4 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.
The installation shall be executed by a professional.
Connecting the welding hose
1. Open the side of the wire feed unit that contains the wire feed mechanism. Undo
the locking screw on the connecting block.
2. Choose the appropriate inlet nozzle for the wire being used and push it securely
into the welding hose.
3. Connect the welding hose to the wire feed unit and tighten the locking screw on
the connecting block.
4. Remove the plastic cover from the gun housing, undo the locking screw and
push in the other end of the welding hose. Then tighten the locking screw.
5. Check that the welding hose connections are correctly positioned and that the
locking screws have been securely tightened. Refit the plastic cover.
Connecting the welding current
Connect the welding cable from the positive socket on the power supply to the cur-
rent terminal on the connecting block.
Connecting the compressed air
Remove the panel, which is secured to the casing by four screws. Insert the air sup-
ply hose through the g rommet in the opposite side of the casing (next to control
cable) and connect the compressed air hose to the nipple o n the filter regulator.
Tighten the air hose coupling.
NOTE!
If the wire feed unit is suspended the filter regulator must be set in the vertical posi-
tion. This prevents any water remaining in the compressed air system from reaching
the welding gun and causing operating problems.
Rotate the filter regulator anticlockwise so that it is directly opposite the hole in the
casing intended for this purpose. Then tighten the filter regulator.
Connecting the shielding gas
Connect the shielding gas directly to the nipple on the solenoid valve.
GB
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5 OPERATION
Replacing the wire
The wire conduit is made of plastic and can be damaged by sharp objects. Remove
any burrs or sharp edges from the tip of the wire using a file, before feeding the new
wire into the wire conduit.
1. Release the pressure roller springs.
2. Withdraw any remaining wire from the conduit. Remove the wire reel.
3. Fit the new wire reel.
4. Straighten out the first 5--10 cm of the wire and file off any sharp edges from the
tip of the wire.
5. Make sure the correct size inlet nozzle is fitted to the welding hose.
6. Guide the wire into the wire feed unit. Make sure it passes through the grooves
in the feed rollers, into the outlet nozzle and then into the inlet nozzle of the
welding hose. If welding with Æ 1,6 mm wire the outlet nozzle must first be
removed.
7. Re--tension the pressure roller springs.
8. Fit the correct contact tip to the welding gun.
9. Switch on the power source, press the gun trigger and allow the wire to advance
through the welding hose and out of the contact tip.
WARNING!
Rotating parts can cause injury, take great care.
6 MAINTENANCE
Cleaning
When necessary clean the wire feed mechanism in the wire feed unit and the wire
conduit in the welding hose using compressed air. Clean the grooves in the feed
roller and pressure roller.
You should also clean the inlet and outlet nozzles of the wire feed mechanism. Dis-
mantle as follows:
1. Undo the screw on the connecting block using an Allen key, then remove the
welding hose.
2. Undo the two stop screws that hold the inlet and outlet nozzles in place and
remove them.
3. Refit the nozzles after cleaning.
7 ORDERING OF SPARE PARTS
When ordering please state the machine model, serial number, part name and part
number. This simplifies dispatch and ensures correct delivery.
GB
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