Page is loading ...
0441 457 001 9704
MEI 20
W ire feed unit
Simplified service manual
LIST OF CONTENTS Page
SAFETY 3.................................................
TECHNICAL DESCRIPTION 4...............................
INSTALLATION 5...........................................
DIMENSION DRAWING 7....................................
CIRCUIT DIAGRAM 8.......................................
OPTIONAL EQUIPMENT 8..................................
SPARE PAR TS LIST 9.......................................
Rights reserved to alter specifications without notice.
-- 3 --cqa1d1ea
SAFETY
Users of ESAB welding equipment have the ultimate responsibility for ensuring that anyone who
works on or near the equipment observes all the relevant safety precautions.
Safety precautions must meet the requirements that apply to this type of welding equipment.
The following recommendations should be observed in addition to the standard regulations that apply
to the work place.
All work must be carried out by trained personnel well familiar with the operation of the welding equip-
ment.
Incorrect operation of the equipment may lead to hazardous situations which can result in injury to the
operator and damage to the equipment.
1. Anyone who uses the welding equipment must be familiar with:
S its operation
S its function
S relevant safety precautions
S welding
2. The operator must ensure that:
S no unauthorized person is stationed within the working area of the equipment when it is
started up.
S that no--one is unprotected when the arc is struck
3. The work place must:
S be suitable for the purpose
S be free from draughts
4. Personal safety equipment
S Always wear recommended personal safety equipment, such as safety glasses, flame--proof
clothing, safety gloves.
S Do not wear loose--fitting items, such as scarves, bracelets, rings, etc., which could become
trapped or cause burns.
5. General precautions
S Make sure the return cable is connected securely.
S Work on high voltage equipment shall only be carried out by a qualified electrician.
S Appropriate fire extinquishing equipment must be clearly marked and close at hand.
S Lubrication and maintenance must not be carried out on the equipment during operation.
WARNING
READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE INSTALLING OR OPERATING.
ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND OTHERS. TAKE PRECAUTIONS 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 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!
dqa1d001
-- 4 --
cqa1d1ea
TECHNICAL DESCRIPTION
MEI 20 is a wire feed unit for mechanized welding. It has been developed for connection to
the power sources MECHTIG 315 INVERTER, PROTIG 315 INVERTER, PROTIG and
PROWELDER 250.
It consists of the following units:
1. Tubular support
2. Feed unit
3. Drive motor
4. Bobbin holder
5. Cable
6. Wire conduit
The tube frame (1) is fitted with a handle, which is
positioned so that the wire feed unit balances when
lifted.
The MEI 20 is designed for wire diameters Ø 0.6 to Ø 0.8 mm.
The reel holder (4) will accept reels with an outer diameter of 200 mm and a width of 60 mm.
The cover, which is removed to check or change the wire, is held by snap fasteners.
A DC motor (3) with gearwheel drives the two feed rollers through a cog.
The motor is equipped with a tachometer generator which is connected to the power supply
for accurate control of feed speed. The feed rollers have two grooves for wire and each
groove is intended for a given wire size.
Two pressure rollers, which provide the necessary friction between the wire and the feed
roller, are mounted in a spring mechanism that allows the pressure to be adjusted.
A cable (5) is provided for connecting the MEI 20 to the power source.
The MEI 20 has no controls of its own. It is controlled by means of the MECHTIG 315 or
PROTIG 315 power source.
-- 5 --cqa1d1ea
Technical data
Motor:
Rated voltage
Gear ratio
Speed
Max power
48 V DC
159:1
70--5500 rpm
50 W
Wire bobbin:
Exterior diameter
Width
Width of hub
Hub hole, diameter
200 mm
60 mm
60 mm
51.5 mm
Length of wire conduit 4.2 m
Wire feed speed 0.1--2.6 m/min
Weight with bobbin 9.0 kg
Weight without bobbin 4.0 kg
For physical dimensions, see dimension drawing on page 7.
INSTALLATION
WARNING!
Rotating parts can cause injury so take great care.
Connecting the wire conduit
1. Unscrew the bolt on the output side of the wire feed unit.
2. Connect the wire conduit and tighten the bolt.
3. Make sure the wire conduit is f itted correctly and t hat the end bottoms in the socket.
4. Undo the quick connector on the wire feed hose.
5. Screw the holder onto the welding tool.
6. Push the teflon liner into the tapered hole in the holder. Screw the liner in place.
7. Screw the wire helix onto the holder on the tool. Screw the contact tip onto the wire
helix. Screw the contact tip holder onto the tool but do not fit the contact tip into the
holder yet.
-- 6 --
cqa1d1ea
8. Open the feed rollers and pull the wire through far enough so that it will reach the full
length of the wir e feed hose to the tool.
9. Straighten the end of the wire and file the end round.
10. Insert the wire through the quick connector and push it through the teflon liner, wire
helix and contact tip holder.
11. Refit the quick connector.
12. Fit the contact tip in the holder.
Changing the wire
1. Release the feed roller pressure spring.
2. Rewind any existing wire out of the wire feed unit and remove the wire reel.
3. Straighten the first 10--20 cm of the wire. File off any burrs or sharp edges on the wire
before feeding it through the wire feed unit. Make sure the wire passes correctly through
the grooves in the wire feed roller and through the contact tip / wire conduit.
4. Retension the spring.
5. Press the reel cover in place.
6. Start wire feed using the switch on the control unit / power source.
Wire feed unit Ordering numbers
Power source Feed unit with cable
PROTIG, PROWELDER 250 441 717--880
PROTIG 315 441 717--880
MECHTIG 441 717--882
dqa1m001
-- 7 --cqa1d1ea
DIMENSION DRAWING
-- 8 --
cqa1d1ea
CIRCUIT DIAGRAM
cqa1c001
OPTIONAL EQUIPMENT
cqa1o001
333 643-880 Quick-couplin g complete
1 334 213-880 Quick-coupling
2 334 704-001 Cable support
-- 9 --sMEI20
SPARE PARTS LIST
MEI 20
Edition 9704
Spare parts are to be ordered through the nearest ESAB agency as per the list on
the back of the cover. Kindly indicate type of unit, serial number, denominations and
ordering numbers according to the spare parts list.
-- 1 0 --sMEI20
-- 1 1 --sMEI20
Item
Qty Orderingno. Denomination Notes
441 348--880 Wire feed unit
1 1 441 300--880 Feed unit
2 1 441 349--880 Tubular support
3 1 441 346--001 Reel protection cap
4 1 441 347--001 Cover
5 1 152 177--001 Hub
6 1 2121 015--60 Screw M8x25
7 1 2195 043--05 Cup spring ø 16/8.2
8 2 152 122--001 Washer ø 35/9x3
9 1 2126 011--09 Nut M8
10 4 2188 122--01 End sleeve
11 1 441 455--880 Wire conduit
12 1 157 189--880 Cable PRO--TIG
1 442 357--880 Cable MECHTIG
13 1 441 718--880 Cable LTD 200
14 1 442 116--001 Protective bracket
15 1 442 117--001 Protecting plate
16 1 441 729--143 Tension spring
-- 1 2 --sMEI20
Item
Qty Orderingno. Denomination Notes
441 300 --880 Feed unit
01 1 441 299--880 Feed mechanism
02 1 441 306--001 DC motor
03 1 441 989--001 Housing
11 1 155 899--882 PC board
12 1 191 953--101 Cable 0.25 mm
2
13 1 441 988--880 Protective pipe
14 1 191 193--105 Tape
15 1 5385 000--07 Pin socket
16 1 2641 011--01 Cable lug
17 2 192 238--368 Allen screw M6x16
18 4 192 238--295 Allen screw
19 4 193 189--222 Screw M3x8
20 3 2122 045--46 Stop screw M5x12
21 2 441 608--004 Washer
22 2 334 210--001 Bushing
23 2 2151 000--13 Washer
24 1 192 883--017 Capacitor 0.1 ìF 400 V
25 1 193 189--220 Screw M3x6
26 1 442 116--001 Protective attachement
27 1 442 117--001 Guard plate
28 2 441 729--143 Draw spring
29 1 441 990--001 Guide nipple
-- 1 3 --sMEI20
-- 1 4 --sMEI20
Item
Qty Orderingno. Denomination Notes
441 299--880 Feed mechanism
1 1 367 907--026 Nut
2 1 367 907--024 Adjusting nut
3 1 367 907--025 Shaft, camps.
4 1 367 907--023 Adjusting screw
5 1 367 907--003 Inlet nozzle ø 2.5 PZ9803/25
6 2 367 907-011 Locking screw
7 1 367 907-010 Locking screw
8 1 367 907-002 Feed unit plate
9 1 441 990--001 Guider ø1.2
10 2 Locking screw
11 3 367 907--029 Allen screw
12 2 367 907--012 Shaft
13 4 367 907--013 Ball bearing
14 1 441 304--001 Pinion
15 2 369 557--001 Feed roller
ø0.6--0.8
2 369 557--003 Feed roller
ø1.0--1.2
2 369 557--007 Feed roller
ø1.2--1.6
16 2 367 907--014 Washer
17 3 367 907--015 Screw
18 1 367 907--017 Screw
19 2 367 907--021 Front spacer
20 2 367 907--019 Ball bearing
21 2 367 907--020 Rear spacer
22 2 367 907--016 Pressure arm, compl.
23 2 367 907--018 Locking washer
24 2 367 907--022 Pressure spring
1 367 907--008 Pressure arm, compl.
-- 1 5 --sMEI20
-- 1 6 --sMEI20
Item
Qty Orderingno. Denomination Notes
441 455--880 Wire conduit
1 1 441 456--880 Outlet tube
2 1 155 244--001 Housing
3 1 442 325--001 Wire guide
4 1 333 643--880 Snap--on connection
-- 1 7 --sMEI20
Item
Qty Orderingno. Denomination Notes
332 790--880 Wire nozzle, compl. PRB18--40, ø 0.8
332 790--881 Wire nozzle, compl. PRB 36--80, ø 0.8
332 790--882 Wire nozzle, compl. PRB 71--160, ø 0.8
332 790--883 Wire nozzle, compl. PRB 140--220, ø 0.8
01 1 332 861--001 Insulating bushing
02 1 154 485--001 Jointing nipple
03 1 332 791--001 Mount
04 1 332 792--001 Journal
05 1 333 420--880 Journal
06 2 190 509--321 Screw M5x6
07 1 332 793--001 Wire nozzle
08 1 2122 043--43 Stop screw M5x6
09 1 190 685--803 Hose L=98
10 1 190 685--803 Hose L=162
11 1 190 685--803 Hose L=202
12 1 190 685--803 Hose L=257
13 1 2192 068--20 Wire spiral
14 1 2192 068--21 Wire spiral
15 1 2192 068--19 Wire spiral
16 1 2192 068--23 Wire spiral
17 1 334 704--001 Cable support
ESAB Welding Equipment AB
SE--695 81 L AXÅ
SWEDEN
Phone +46 584 81 000
Fax +46 584 123 08
www.esab.com
001004
ESAB subsidiaries and representative offices
Europe
AUSTRIA
ESAB Ges.m.b.H
Vienna-- Liesing
Tel: +43 1 888 25 11
Fax: +43 1 888 25 11 85
BELGIUM
S.A. ESAB N.V.
Brussels
Tel: +32 2 745 11 00
Fax: +32 2 726 80 05
THE CZECH REPUBLIC
ESAB VAMBERK s.r.o.
Prague
Tel: +420 2 819 40 885
Fax: +420 2 819 40 120
DENMARK
Aktieselskabet ESAB
Copenhagen-- Valby
Tel:+4536300111
Fax:+4536304003
FINLAND
ESAB Oy
Helsinki
Tel: +358 9 547 761
Fax: +358 9 547 77 71
FRANCE
ESAB France S.A.
Cergy Pontoise
Tel:+33130755500
Fax:+33130755524
GERMANY
ESAB GmbH
Solingen
Tel: +49 212 298 0
Fax: +49 212 298 204
GREAT BRITAIN
ESAB Group (UK) Ltd
Waltham Cross
Tel: +44 1992 76 85 15
Fax: +44 1992 71 58 03
ESAB Automation Ltd
Andover
Tel: +44 1264 33 22 33
Fax: +44 1264 33 20 74
HUNGARY
ESAB Kft
Budapest
Tel:+3612044182
Fax:+3612044186
ITALY
ESAB Saldatura S.p.A.
Mesero (Mi)
Tel:+3902979681
Fax:+390297289181
THE NETHERLANDS
ESAB Nederland B.V.
Utrecht
Tel: +31 30 248 59 22
Fax: +31 30 248 52 60
NORWAY
AS ESAB
Larvik
Tel:+4733121000
Fax:+4733115203
POLAND
ESAB Sp.z.o.o
Warszaw
Tel: +48 22 813 99 63
Fax: +48 22 813 98 81
PORTUGAL
ESAB Lda
Lisbon
Tel: +351 1 837 1527
Fax: +351 1 859 1277
SLOVAKIA
ESAB Slovakia s.r.o.
Bratislava
Tel:+421744882426
Fax:+421744888741
SPAIN
ESAB Ibérica S.A.
Alcobendas (Madrid)
Tel: +34 91 623 11 00
Fax: +34 91 661 51 83
SWEDEN
ESAB Sverige AB
Gothenburg
Tel:+4631509500
Fax:+4631509222
ESAB International AB
Gothenburg
Tel:+4631509000
Fax:+4631509360
SWITZERLAND
ESAB AG
Dietikon
Tel: +41 1 741 25 25
Fax: +41 1 740 30 55
North and South America
ARGENTINA
CONARCO
Buenos Aires
Tel: +54 11 4 753 4039
Fax: +54 11 4 753 6313
BRAZIL
ESAB S.A.
Contagem--MG
Tel: +55 31 333 43 33
Fax: +55 31 361 31 51
CANADA
ESAB Group Canada Inc.
Missisauga, Ontario
Tel: +1 905 670 02 20
Fax: +1 905 670 48 79
MEXICO
ESAB Mexico S.A.
Monterrey
Tel: +52 8 350 5959
Fax: +52 8 350 7554
USA
ESAB Welding & Cutting Products
Florence, SC
Tel: +1 843 669 44 11
Fax: +1 843 664 44 58
Asia/Pacific
AUSTRALIA
ESAB Australia Pty Ltd
Ermington
Tel: +61 2 9647 1232
Fax: +61 2 9748 1685
CHINA
Shanghai ESAB A/P
Shanghai
Tel: +86 21 6539 7124
Fax: +86 21 6543 6622
INDIA
ESAB India Ltd
Calcutta
Tel: +91 33 478 45 17
Fax: +91 33 468 18 80
INDONESIA
P.T. Esabindo Pratama
Jakarta
Tel: +62 21 460 01 88
Fax: +62 21 461 29 29
MALAYSIA
ESAB (Malaysia) Snd Bhd
Selangor
Tel: +60 3 703 36 15
Fax: +60 3 703 35 52
SINGAPORE
ESAB Singapore Pte Ltd
Singapore
Tel: +65 861 43 22
Fax: +65 861 31 95
ESAB Asia/Pacific Pte Ltd
Singapore
Tel: +65 861 74 42
Fax: +65 863 08 39
SOUTH KOREA
ESAB SeAH Corporation
Kyung --Nam
Tel: +82 551 289 81 11
Fax: +82 551 289 88 63
THAILAND
ESAB (Thailand) Ltd
Samutprakarn
Tel: +66 2 393 60 62
Fax: +66 2 748 71 11
UNITED ARAB EMIRATES
ESAB Middle East
Dubai
Tel: +971 4 338 88 29
Fax: +971 4 338 87 29
Representative offices
BULGARIA
ESAB Representative Office
Sofia
Tel/Fax: +359 2 974 42 88
EGYPT
ESAB Egypt
Dokki--Cairo
Tel: +20 2 390 96 69
Fax: +20 2 393 32 13
ROMANIA
ESAB Representative Office
Bucharest
Tel/Fax: +40 1 322 36 74
RUSSIA--CIS
ESAB Representative Office
Moscow
Tel: +7 095 937 98 20
Fax: +7 095 937 95 80
ESAB Representative Office
St Petersburg
Tel: +7 812 325 43 62
Fax: +7 812 325 66 85
Distributors
For addresses and phone
numbers to our distributors in
other countries, please visit our
home page
www.esab.com
/
