Rtech MIG251 Bedienungsanleitung
www.r-techwelding.co.uk
email: salesdept@r-techwelding.co.uk
Tel: 01452 733933 Fax 01452 733939
R-TECH MIG251
MIG WELDER
OPERATION INSTRUCTIONS
Version 2023-11
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3
Thank you for selecng the R-Tech MIG251 Digital Inverter MIG Welder.
The MIG251 Digital has many benets over tradional MIG welders, including EASY SETUP,
innite power control and spool gun opon for easy aluminium welding.
We want you to take pride in operang our MIG251 Digital as much pride as we have taken in
making this product for you. Please read all informaon in this manual before operaon
PLEASE EXAMINE CARTON AND EQUIPMENT FOR DAMAGE IMMEDIATELY
When this equipment is shipped, tle passes to the purchaser upon receipt from the courier. Con-
sequently all claims for material damaged in shipment must be made by purchaser against the
transportaon company used.
Please record your equipment idencaon below for future reference. This informaon can be found
on data plate at rear of machine.
Product: MIG251 Digital MIG Welder
Serial No.
Date of Purchase
Where Purchased
Whenever you request replacement parts or informaon on this equipment please always supply
informaon you have recorded above
Pay parcular aenon to the safety instrucons we have provided you for your protecon The level of
seriousness to be applied to each secon is explained below
This statement appears where the informaon must be followed exactly to avoid serious per-
sonal injury.
CAUTION
This statement appears where the informaon must be following to avoid a minor personal inju-
ry or damage to this equipment.
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Introducon
The R-Tech MIG251 welder is a member of our eld acclaimed family of welding machines.
Premium features include
Digital screen with EASY SET
35% Industrial duty cycle
Inverter power source - more ecient
Quite fan cooling system
Spool gun opon
MMA Sck welder
Lightweight and portable
Euro type torch ngs for easy torch tment/replacement
EASY SETUP MIG and MMA
Professional MIG weld sengs built in using 0.6/0.8/1.0mm wire, ux cored wire and MMA sengs
for 6013/7018 electrode.
Simple to use easy navigaon - no complicated menus - all sengs on single screen.
Trim control to ne tune weld power and wire speed.
MANUAL MIG MODE
Innite welding voltage to allow ne tuning of weld characteriscs
2T, 4T Trigger modes
Burnback control
Spool gun facility - Easy aluminium welding
Welding Capability – Duty Cycle
The R-Tech MIG251 Digital is rated at 250 Amps at 35% duty cycle on a ten minute basis.
If the duty cycle is exceeded a thermal protector will shut machine o unl the machine cools.
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Safety Precauons
Read enre secon before starng installaon.
Warning!
Electric Shock can kill – Only qualied personnel should perform this installaon. Turn o input power at
the fuse box before working on this equipment. Do not touch electrically live parts. Always connect the
machine to an earthed mains supply as per naonal recommended standards.
Select suitable locaon
Place the welder where clean cooling air can freely circulate in and out of the front & rear louver vents.
Dirt, dust or any foreign material that can be drawn through vents into welder must be kept to a mini-
mum. Failure to observe these precauons can result in excessive operang temperatures which can lead
to plant failure.
Grinding
Do not direct grinding parcles towards the welder.
An abundance of conducve material can cause plant failure.
Transport & unloading
Never underesmate the weight of equipment, never move or leave suspended in the air above people.
Use recommended liing/handling equipment at all mes.
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Electrical installaon
WARNING ELECTRIC SHOCK CAN KILL
Electric Shock can kill – Only qualied personnel should perform this installaon. Turn o input power at
the fuse box before working on this equipment. Do not touch electrically live parts. Always connect the
machine to an earthed mains supply as per naonal recommended standards.
Machine grounding and Interference Protecon
This welder must be grounded to earth. See naonal electrical codes for proper grounding methods.
The high frequency generator being similar to a radio transmier may cause interference to radio, TV and
other electronic equipment. These problems may be the result of radiated interference.
Proper grounding methods can reduce or eliminate this.
Radiated interference can develop in the following ways
1. Direct interference from welder power source
2. Direct interference from the welding leads
3. Direct interference radiated from feedback into power lines
4. Interference from re-radiaon by un-grounded metallic objects.
Keeping these contribung factors in mind, installing equipment as per following instrucons should
minimize problems.
1. Keep the welder input power lines as short as possible and enclose as much of them as possible in met-
al conduit or equivalent shielding. There should be a good electrical contact between this conduit and
ground (Earth).
2. Keep the work and electrode leads as short as possible. Tape the leads together where praccal.
3. Be sure the torch and earth leads rubber coverings are free from cuts and cracks that allow welding
power leakage
4. Keep earth lead connecon to work in good condion – Clean area on workbench where earth clamp is
situated on a regular basis.
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Electrical installaon cont.
Input Connecons
Make sure the voltage, phase and frequency of input power is as specied on machine rang
plate located at rear of machine.
Have a qualied electrician provide suitable input power as per naonal electrical codes. Make
sure machine is earthed / grounded.
Make sure fuse or circuit breaker is correct rang for machine. Using fuses or circuit breakers
smaller than recommended will result in ‘nuisance’ shut o from welder inrush currents even if
welding at low amperages.
Failure to follow these instrucons can cause immediate failure within the welder and void ma-
chines warranty.
Turn the input power OFF at the mains switch & fuse box before working on this equipment. Have
a qualied electrician install & service this equipment.
Allow machine to sit for 5 minutes minimum to allow the power capacitors to discharge before
working inside this equipment. Do not touch electrically live parts
The MIG251 Digital MIG Welder requires a 240V 50/60Hz supply. It requires a 32A supply.
It comes with a 2.5 metre mains cable aached.
Connect wires according to naonal coding.
Brown wire – Live
Blue wire – Neutral
Green/Yellow Wire – Earth (Ground)
Connecng to an Engine Driven Generator
If connecng this machine to an engine driven generator please ensure the following
Minimum Generator KVA Output – 7.0 KVA connuous Generator to be ed with AVR
(automac voltage regulaon) DO NOT USE ON A GENERATOR WITHOUT AVR
Connecng to a generator without the above minimum requirements
will invalidate your warranty.
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Input 240V AC 50/60Hz Input amperage 32A
Gross weight 20 KG
Dimensions 600L x 270W x 480H (mm)
Insulaon IP21S
MIG Current range MIG 30A - 250A
No load voltage 80VDC
Duty cycle 35% @ 250A
Trigger modes Manual mode 2T,4T
MIG EASY SET Wire diameter 0.6, 0.8, 1.0mm
Material thickness selector 0.8, 1.0, 1.5, 2.0, 3.0, 4.0, 5.0, 6.0, 8mm
MIG Manual mode Welding voltage 13.0 - 27V
Wire feed speed 1.5 - 15.0 m/min
Spool gun opon Yes
Burnback control 0.0s - 2.0s
Wire diameter 0.6, 0.8, 1.0mm
MMA EASY SET Electrode size 2.5, 3.2, 4.0mm
Electrode type 6013, 7018
Material thickness 1.5 - 10.0mm (See page 19)
MMA Manual mode Amperage range 20 - 200A
Electrodes Mild / Stainless Steel / Dissimilar
Technical specicaons
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Connecons
Front panel connecons
MIG mode + posive
connector for earth
lead for gasless ux
cored wire only.
MMA mode - connect
electrode holder.
7 pin socket for
spool on gun.
MIG mode - connect
earth lead (negave)
when welding with
GAS.
MMA mode - connect
Earth lead
Euro torch connector. Connect Euro type MIG torch to euro torch connector, align torch connector to machine con-
nector and then turn retaining ring clockwise to secure. Ensure torch is secured ghtly to avoid weld power problems
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Rear panel connecons cont..
Gas connector & Extra earth connecon
3/8 BSP male connector
for gas input
Extra earth connecon, used if you experience
local interference (not normally used)
On/O
switch
Mains input cable - comes
with 2.5m cable ed.
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