LORCH MF-07 User manual

LORCH Schweißtechnik GmbH
PO Box 1160
D-71547 Auenwald
Tel: [phone] / 503-0
Fax: [phone] / 503-199
Website: www.lorch.biz
email: [email protected]
909.1930.1-01
Operation Manual
Wire feeder MF-07 (EU)

Publisher LORCH Schweißtechnik GmbH
PO Box 1160,
D-71547 Auenwald, Germany
Telephone: [phone] / 503-0
Telefax: +49 (0) 7191 / 503-199
Website: www.lorch.biz
email: [email protected]
Document number 909.1930.1-01
Issue date 13.06.2013
Copyright © 2012, LORCH Schweißtechnik GmbH
This documentation including all its parts is protected by copyright. Any use or
modication outside the strict limits of the copyright law without the permission of
LORCH Schweißtechnik GmbH is prohibited and liable to prosecution.
This particularly applies to reproductions, translations, microlming and storage and
processing in electronic systems.
Technical changes Our machines are in a constant state of further development, and the right is
reserved to make technical changes without notice.

- 3 -
06.13
Table of contents
1 Machine elements ..............4
2 Explanation of symbols .........5
2.1 Meaning of the symbols in the operation manual .
......................................5
2.2 Meaning of the symbols on the machine ......5
3 Safety precautions .............6
4 Ambient conditions.............7
5 General regulation of use........7
6 UVV inspection ................7
7 Noise emission ................7
8 Electromagnetic compatibility
(EMC) ........................7
9 Transport .....................8
10 Before start-up. . . . . . . . . . . . . . . . . 9
10.1 Connecting .............................9
10.2 Insert the welding wire spool ..............10
10.3 Thread the wire electrode in ...............10
10.4 Connecting the inert gas cylinder ...........11
11 Start-up......................12
12 Repair and maintenance........13
12.1 Check regularly.........................13
13 Troubleshooting ..............14
14 Technical data ................16
15 Disposal .....................16
16 Service ......................16
17 Declaration of conformity.......16
18 Ersatzteilliste / spare parts list /
Список деталей ..............18
19 Stromlaufplan / schematic /
Схематический ..............19

- 4 -
Machine elements
06.13
1 Machine elements
1 Protective cover wire coil
2Handle (hoisting point)
3Wire coil guiding spike
4Side panel
5Closure
6Feed unit
7Wire feed button
8Central socket
9Torch holder
10 Inert gas connection
11 Control cable connection
12 Welding current connection
13 Interpass hose package
2
1
3
7
8
4
5
6
9
10 11 12 13

- 5 -
Explanation of symbols
06.13
2 Explanation of symbols
2.1 Meaning of the symbols in the opera-
tion manual
Danger to life and limb!
If the danger warnings are disregarded,
this can cause slight or severe injuries or
even death.
Danger of property damage!
Disregarding danger warnings can cause
damage to workpieces, tools, and equip-
ment.
General note!
Indicates useful information about the
product and equipment.
2.2 Meaning of the symbols on the
machine
Danger!
Read the user information in the operation
manual.
Disconnect the mains plug!
Pull out the mains plug before opening the
housing. Explanation of symbols
i

- 6 -
Safety precautions
06.13
3 Safety precautions
Hazard-free working with the machine is
only possible if you read the operating and
safety instructions completely and strictly
observe them.
Please obtain practical training before
using the machine for the rst time. Fol-
low the accident prevention regulations
(UVV1)).
Remove all solvents, degreasers, and
other ammable materials from the work-
ing area before starting welding. Non-
movable ammable materials must be
covered. Only weld if the ambient air con-
tains no high concentrations of dust, acid
vapours, gases or ammable substances.
Special care must be taken during repair
work on pipe systems and tanks which
contain or have contained ammable liq-
uids or gases.
Never touch live parts inside or outside of
the housing. Never touch welding elec-
trodes or live welding current parts in a
machine that is on.
Do not expose the machine to rain; do not
clean with sprays or steam jets.
Always use a protection shield when weld-
ing. Warn anyone in the work area about
the dangers of arc rays.
Please use a suitable extraction system
for gases and cutting vapours.
Always wear breathing apparatus when-
ever there is a risk of inhaling welding or
cutting fumes.
If the power cable is damaged or severed
while working, do not touch the cable,
but immediately pull out the mains plug.
Never use a machine if the mains cable is
damaged.
Keep a re extinguisher near the welding
area.
Check the welding area for re after weld-
ing (see UVV*).
Never try to disassemble the pressure
reducer. Replace the pressure reducer if
faulty.
1) Only applicable for Germany. Can be ordered from
Carl Heymanns-Verlag, Luxemburger Str. 449, 50939
Köln.
The machine must be transported or set
up only on rm, level surfaces.
The maximum admissible angle of inclina-
tion for setting up or transporting is 10°.
Risk of injury due to crushing when reach-
ing into the wire feed rollers or feed unit
gears.
Ensure that neither your own limbs or
clothing nor those of other persons can
get into the operating area of the feed unit
when the burner or wire infeed button is
operated.
Service and repair work may only be carried out by a
trained electrician.
Ensure that there is good direct contact for the ground
cable immediately beside the weld point. Do not pass
the welding current through chains, ball bearings,
steel cables, grounding conductors, etc., as it could
cause these to melt.
Secure yourself and the welding machine when work-
ing in elevated or inclined areas.
The machine should be connected only to a properly
grounded mains supply. (Three-phase four-wire sys-
tem with grounded neutral conductor or single phase-
three-wire system with grounded neutral conductor)
socket and extension cable must have a functional
protective conductor.
Wear protective clothing, leather gloves and a leather
apron.
Protect the welding area with curtains or mobile
screens.
Do not use welding equipment to thaw out frozen wa-
ter pipes or lines.
In closed containers, under cramped conditions, and
in high electrical risk areas, only use machines with
the S sign.
When taking a break, switch off the machine and
close the valve on the gas cylinder.
Secure the gas cylinder with a chain to prevent it fall-
ing over.
Disconnect the mains plug from the mains before
changing the place of installation or making repairs
to the machine.
Please heed the safety regulations which apply to your
country. Subject to change.

- 7 -
Electromagnetic compatibility (EMC)
06.13
4 Ambient conditions
Temperature range of ambient air:
in operation: -10 °C ... +40 °C (+14 °F to +104 °F)
transport and
storage: -25 °C ... +55 °C (-13 °F to +131 °F)
Relative humidity:
up to 50 % at 40 °C (104 °F)
up to 90 % at 20 °C (68 °F)
Operation, storage and transport may only
be carries out within the ranges indicated!
Use outside of this range is considered
not used with its intended purpose. The
manufacturer is not liable for damages
cause by misuse.
Ambient air must be free of dust, acids, corrosive gases
or other damaging substances!
5 General regulation of use
The device is intended for feeding in welding wire (ller
material) in combination with a welding power source
under commercial and industrial usage conditions.
6 UVV inspection
Operators of commercially-operated welding systems
are obliged to have regular safety inspections of the
equipment carried out in accordance with EN 60974-4.
Lorch recommends inspections at 12 month intervals.
A safety inspection must also be carried out if modica-
tions or repairs have been made to the system.
Improper UVV inspections can destroy
the system. For more information on UVV
inspections of welding systems, please
contact your authorised Lorch service
centre.
7 Noise emission
The noise level of the unit is less than 70 dB(A),
measured under standard load in accordance with EN
60974-1 in the maximum working point.
8 Electromagnetic compatibility
(EMC)
This product is manufactured in conformance with the
current EMC standard. Please note the following:
The machine is intended for welding in both commer-
cial and industrial applications (CISPR 11 class A).
Use in other surroundings (for example in residential
areas) may disturb other electronic devices.
Electromagnetic problems during start-up can arise
in:
– mains cables, control cables, signal and telecom-
munication lines near the welding or cutting ma-
chine
– TV/radio transmitters/receivers
– Computers and other control devices
– Protection equipment such as alarm systems
– Pacemakers and hearing aids
– Measurement and calibration devices
– Equipment with too little protection against inter-
ference
If other equipment is disturbed, it may be necessary to
provide additional shielding.
The affected area may go beyond the boundaries of
the property concerned. This depends on the layout
of the building, and the other activities that may be
going on there.
Please use the machine in compliance with the manu-
facturer's instructions. The operator of the equipment is
responsible for the installation and use of the machine.
Furthermore, the owner is responsible for eliminating
the interference caused by electromagnetic elds (pos-
sibly with technical assistance by the manufacturer).

- 8 -
Transport
06.13
9 Transport
Danger of injury due to the device fall-
ing.
For transport using mechanical lifting
equipment (e.g. crane, ...) only handle 2
may be used as the hoisting point. Use
suitable load-bearing equipment.
Do not use a fork-lift truck or similar de-
vice to lift the machine by its housing.
2
Fig. 1: Hoisting points

- 9 -
Before start-up
06.13
10 Before start-up
When using a feed case, a welding power
source with internal controller for MIG
welding is required (e.g. Lorch MX 350
(EU)).
Please observe the operating manual of
the welding power source!
10.1 Connecting
Switch off the welding power source at the
main switch before carrying out the follow-
ing work:
For attachment and detachment of
torches, hose pack, additional case or an
auxiliary drive.
Failure to observe these points may result
in malfunctions in or damage to electronic
components.
14 15 16
ÂUnscrew the two screws of clamp 14 and remove
clamp 14 and the cable feedthrough 13.
Clamp 14 and the cable feedthrough 13 are no longer
required.
ÂRemove the cable feedthrough 16 from the wire run-
off plate.
The cable feedthrough 16 is no longer required.
9
10 11 12 13
ÂPush the connections of the interpass hose package
13 of the welding power source through the opening
of the wire runoff plate.
ÂFasten the interpass hose package 13 on the wire runoff
plate by turning the hexagon. Use a suitable open ended
spanner for this,
ÂConnect the wiring power source of the interpass hose
package of the wiring power source to the wiring current
connection 12.
ÂConnect the control cable of the interpass hose package
of the wiring power source to the socket of control cable
11.
ÂConnect the inert gas line power source of the interpass
hose package of the wiring power source to the inert gas
connection 10.
8
ÂConnect the main plug of the torch to the central
socket 3.
i

- 10 -
Before start-up
06.13
10.2 Insert the welding wire spool
Injury and re hazard through glowing
welding seams or parts!
Overhanging wires on the welding wire spool
can cause short-circuits with the side panel
or the base of the equipment.
When inserting the welding wire spool, ensure
that it is wound correctly and that there are no
overhanging wires.
1
4
5
ÂOpen the protective cover 1 by reaching through the
opening and pulling the protective cover 1 diagonally
downwards (arrow).
ÂFold the protective cover 1 all the way up.
2220 321
Fig. 2: Wire coil guiding spike
ÂUnscrew the retaining nut 20 from the wire coil guid-
ing spike 3.
ÂPush the welding wire spool onto the wire coil guiding
spike 3 and ensure that the carrier mandrel 22 locks
in position.
For small welding wire spools, use an adaptor (order
number 620.9650.0).
ÂSet the wire brake 25 so that, when the torch switch
is released, the welding wire spool just does not run
on.
10.3 Thread the wire electrode in
Risk of injury due to crushing when reach-
ing into the wire feed rollers or feed unit
gears.
Ensure that neither your own limbs or cloth-
ing nor those of other persons can get into
the operating area of the feed unit when the
burner or wire infeed button is operated.
ÂUnlock fastener 5 and open the left side panel 4.
ÂUnscrew the contact tip of the torch .
The wire diameter not visible on the wire
feed rollers is set!
Example: For 1.0/0.8 mm wire feed roller,
a wire diameter of 0.8 is set, if 1.0 is vis-
ible!
The diameter of the wire electrode must agree with
the embossed gure on the back of the wire feed roll-
ers 27.
ÂIf necessary, check the set diameter, by removing the
wire feed rollers 27 and checking the embossed g-
ure on the back.
24
24
26
27 27
8
25 25
Fig. 3: Thread the wire electrode in
ÂFold the tilt lever 24 all the way forward.
9The swivel arms 25 fold up.
27 27
26 8
24 24
25 25
Fig. 4: Thread the wire electrode in

- 11 -
Before start-up
06.13
ÂThread the wire electrode through the inlet nozzle 26
and the central socket 8.
ÂFold the swivel arm 25 down and secure in position
with the tilt levers 24.
ÂSwitch on the welding power source at the main
switch.
7
ÂPress the wire feed button 7.
ÂAdjust the contact pressure using the regulation
screws on tilt lever 24 so that wire feed rollers 27 just
slip when the welding wire spool is stopped.
ABC
A B C
correct Contact pressure
too high
Wrong wire feed
roller
Fig. 5: Wire feed rollers
The wire must not be jammed or deformed.
ÂAdjust the contact pressure of the wire feed rollers
27 on the side of the inlet nozzle 26 to be less than
on the side of the central socket 8 in order to keep
the wire electrode under tension in the wire feed unit.
ÂPush the wire feed button 7 until the wire protrudes
from the torch neck by about 20 mm.
ÂScrew the contact tip matching the wire thickness into
the torch and cut off the protruding end of the wire.
10.4 Connecting the inert gas cylinder
34 31
33
36
35
32
30
Fig. 6: Gas connection
ÂPlace the inert gas cylinder 36 in a suitable location
and secure to prevent it from falling over.
The cylinder can be secured using a wall bracket or
cylinder trolley.
ÂBriey open the gas cylinder valve 35 several times
in order to blow out any dirt particles that are present.
ÂConnect the pressure reducer 30 to the inert gas cyl-
inder 36.
ÂScrew the inert gas hose 32 to pressure reducer 30
and open the gas cylinder valve 35.
Setting the inert gas quantity
ÂPress the "Gas test" button 41.
9Inert gas ows out.
9The ow meter 31 indicates the gas quantity, and
the content pressure gauge 34 indicates the cylinder
content.
ÂAdjust the inert gas quantity at the setting screw 33.
Rule of thumb:
Gas volume = wire diameter x 10 l/min.

- 12 -
Start-up
06.13
11 Start-up
When using a feed case, a welding power
source with internal controller for MIG
welding is required (e.g. Lorch MX 350
(EU)).
Please observe the operating manual of
the welding power source!
7
40 41 42
Fig. 7: Control panel
7Wire feed button
for manual wire feed.
40 Welding voltage rotary knob
for adjusting the welding voltage
41 Gas test
the gas test is carried out for approx. 30 sec.
when the button is pressed.
42 Wire feed rotary knob
Manual mode: the wire feed is set manually.
Synergic mode: The wire feed is automatically
adjusted to the set welding voltage.
The rotary knob can be used to correct the wire
feed with "+" or "-".
ÂSet the desired MIG operating mode at the welding
power source.
ÂUse the rotary knob 40 to set the desired welding
voltage.
ÂUse the rotary knob 42 to set the desired wire feed or
wire speed correction.
i

- 13 -
Repair and maintenance
06.13
12 Repair and maintenance
The machine requires a minimum of care and mainte-
nance. Only a few items need to be checked to ensure
trouble-free long-term operation.
12.1 Check regularly
Check the following points for damage before start-
ing up the welding machine,
– Welding torch and connections
– Inert gas connections
Blow out the welding machine every two months.
ÂSwitch the welding power source off.
ÂDisconnect the mains plug of the welding power
source.
ÂBlow out the feed case with dry, low pressure com-
pressed air. Avoid blowing directly on the electronic
components from a short distance, to prevent dam-
age.
Never make repairs or technical chang-
es yourself.
In this case the manufacturer's warranty
is no longer valid and the manufacturer
accepts no product liability for the equip-
ment.
If you experience problems or need re-
pairs, contact a dealer authorised by
Lorch.
i

- 14 -
Troubleshooting
06.13
13 Troubleshooting
Fault Possible cause Rectication
Torch becomes too hot The torch is clogged by dirt in the cool-
ant system
Flush the torch with water hoses out in
the opposite ow direction
Contact tip not tightened properly check
Torch switch has no function when
actuated
Union nut from torch hose pack to cen-
tral socket is not correctly tightened
Tighten the union nut
Open circuit in control cable in the torch
hose pack
Check and replace if necessary
Thermal protection has triggered Allow the equipment to cool down at
no-load
Wire sticking or burnt onto contact tip Wire electrode jammed on the reel Check and replace if necessary
Burr at start of wire Trim the end of the wire
Wire feed irregular or failed completely Incorrect contact pressure on wire feed
unit
Set as described in the operating in-
structions
Torch faulty Check and replace if necessary
Guide tube in the central socket is
missing or dirty
Insert the guide tube or clean it
Welding wire reel badly wound Check and replace if necessary
Surface rust on wire electrode Check and replace if necessary
Torch internal coil clogged with abra-
sion dust
Unscrew the torch from the equipment,
remove contact tip from torch and blow
out the coil with compressed air
Torch internal coil exed Check and replace if necessary
Wire brake setting too hard Set as described in the operating in-
structions
Equipment switches off Duty cycle exceeded Allow the equipment to cool down at
no-load
Insufcient cooling of components Check air inlet and outlet on the equip-
ment
Cooler or hoses burst or pump is dam-
aged.
Coolant system has frozen up due to
lack of antifreeze
Inform Service
Arc or short circuit between contact tip
and gas nozzle
A spatter bridge has formed between
the contact tip and the gas nozzle
Remove using suitable special pliers
Unstable arc Contact tip does not match the wire
diameter or contact tip is worn
Check and replace if necessary
Control panel is completely dark Phase missing Check the equipment at a different
power socket. Check the supply cable
and mains fuse
Inert gas missing Gas cylinder empty Replace
Torch faulty Check and replace if necessary
Pressure reducer dirty or faulty Check and replace if necessary
Gas cylinder valve faulty Replace gas cylinder
Inert gas does not switch off Gas valve dirty or sticking Remove torch and pressure reducer,
blow out the gas valve in the opposite
ow direction with compressed air

- 15 -
Troubleshooting
06.13
Fault Possible cause Rectication
Inert gas feed insufcient Inert gas quantity set incorrectly at the
pressure reducer
Set the inert gas quantity as described
in the operating instructions
Pressure reducer dirty Check the pressure reducing nozzle
Torch or gas hose blocked or leaking Check and replace if necessary
Inert gas blown away by draughts Eliminate the draughts
Welding power is reduced Phase missing Check the equipment using a different
power socket; check the supply cable
and the mains fuses
Insufcient ground contact at workpiece Create a good clear ground connection
Ground cable not correctly inserted at
the equipment
Lock the ground connector at the equip-
ment by turning clockwise
Torch faulty Repair or replacement
Ground cable connector becomes hot The connector was not locked by turn-
ing clockwise
check
Wire feed unit has increased wire abra-
sion
The wire feed rollers do not match the
wire diameter
Fit the correct feed rollers
Incorrect contact pressure on wire feed
unit
Set as described in the operating in-
structions
Welding voltage and welding current
value blink on the V/A display when
welding and/or after welding (Hold dis-
play)
The set standard values were not
achieved and the installation overload
limit was activated.
Check and if necessary, correct the set
welding parameters.
Welding voltage, welding current: De-
viation between the set values and the
values measured during welding.
Depending on the actual welding pro-
cess, principally a deviation is possible
during short arc welding.
None:
This is a sign of the machine's "internal
control," stabilise the welding process
and increase the attainable quality of
welding.
Tab. 1: Troubleshooting

- 16 -
Declaration of conformity
06.13
14 Technical data
Machine type Case
MF-07
Welding
Welding range (l 2max) A 350
Welding current at ED 100 % 40°C A 270
Welding current at ED 60 % 40°C A 350
weldable wires steel Ø mm 0.8 - 1.2
weldable wires aluminium Ø mm 0.8 - 1.2
weldable wires CuSi Ø mm 0.8 - 1.2
Wire feed rate m/min 2.0 - 15.0
Mains
Supply voltage U1 VDC 24
Current consumption I1
(max. current) A 5
Machine
Protection class (in accordance
with EN 60529) IP2X
Standard EN 60974-5
Dimensions and weights
Dimensions (LxWxH) mm 480 x 200 x
270
Feeder weight kg 10
Standard equipment
Feed unit Roll-
ers 4
Tab. 2: Technical data
ED = Switch-on duration
15 Disposal
Only for EU countries.
Do not dispose of electric tools together
with household waste material!
In accordance with European Council Directive
2002/96/EC on
electrical and electronic equipment waste and its imple-
mentation in accordance with national law, electric tools
that have reached the end of their service life must be
collected separately and returned to an environmentally
compatible recycling facility.
16 Service
Lorch Schweißtechnik GmbH
PO Box 1160
D-71547 Auenwald,
Germany
Tel. [phone]
Fax [phone]
17 Declaration of conformity
We herewith declare that this product was manufac-
tured in conformance with the following standards or of-
cial documents: EN 60974-1:2012, EN 60974-2:2013,
EN 60974-10:2007 CL.A in conformance with the guide-
lines 2014/35/EU, 2014/30/EU, 2011/65/EU.
2016
Wolfgang Grüb
Managing Director
Lorch Schweißtechnik GmbH

- 17 -
Declaration of conformity
06.13

- 18 -
Ersatzteilliste / spare parts list / Список деталей
06.13
18 Ersatzteilliste / spare parts list / Список деталей
Lorch Schweißtechnik GmbH Postfach 1160 D-71547 Auenwald Germany
Tel. [phone] Fax [phone] [email protected] www.lorch.biz
1/106.09.2012
Ersatzteilliste / spare parts list / Список деталей
990.4473.7-00 Vorschubkoffer MF-07 (EU)
wire feeder MF-07 (EU)
Блок подачи проволоки MF-07 (EU)
Pos Mat.Nr. Bezeichnung designation Название
1 620.9341.0 Vorschubeinheit VE 42-30 ZK wire feed unit VE 42-30 ZK
Механизм подачи VE 42-30 ZK
2 620.8963.0 Vorschubrolle 1,0/1,2 ST Typ
30 ZK
feed roll 1,0/1,2 ST Typ 30 ZK Ролик под.1,0/1,2 ST Typ 30 ZK
3 620.8963.1 Vorschubrolle 0,8/1,6 ST Typ
30 ZK
feed roll 0,8/1,6 ST Typ 30 ZK Ролик под.0,8/1,6 ST Typ 30 ZK
4 620.8963.2 Vorschubrolle 1,0/1,2 AL Typ
30 ZK
feed roll 1,0/1,2 AL Typ 30 ZK Ролик под.1,0/1,2 AL Typ 30 ZK
5 620.8963.3 Vorschubrolle 0,8/1,6 AL Typ
30 ZK
feed roll 0,8/1,6 AL Typ 30 ZK Ролик под.0,8/1,6 AL Typ 30 ZK
(E) Ersatzteil / spare part / Запасные части
(T) Tauschteil / replacement part / Обменные части
Gültigkeit / Validity / действительность
Type Serial no. from Serial no. to
--- --- ---
4...52...3
1 2...5 2...5

- 19 -
Stromlaufplan / schematic / Схематический
06.13
19 Stromlaufplan / schematic / Схематический
geändert am/von
changed to/of
Stromlaufplan / shematic-diagram
erstellt am/von
provided to/of 16.05.2012
S00.0069.7-00
F. Becker
Koffer MF-07 (EURO)
Wirespeed
Voltage
N
N
+
-
Motor
M
QF
Solenoid valve
1
2
3
4
5
6
R1
10K/2W
Torch
S2
Inching
S3
:
R2
R3
4,7K/2W
RV24YN20S/15A502
R4
D2
IN 4007
D1
IN 4007
RV24YN20S/B502
R5
7Gas test
S1

Lorch Schweißtechnik GmbH Im Anwänder 24 - 26 D-71549 Auenwald Germany
Tel.: [phone] Fax: [phone] [email protected] www.lorch.biz