Rtech MTS251TFT User manual

www.r-techwelding.co.uk
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R-TECH MTS251TFT
DIGITAL MIG - MMA - DC TIG WELDER
OPERATION INSTRUCTIONS
Version 2023-12-V1

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3
Index
Page
Introducon 4
Safety Precauons 6
Electrical Installaon 7
Technical Specicaons 9
Connecons 11
Controls & Sengs 14
MIG EASY SETUP 19
MIG Manual Mode 20
DC TIG EASY SETUP 22
DC TIG Manual Mode inc. spot/tack 23
Memory Storing 28
MMA STICK EASY SETUP 29
MMA STICK Manual Mode 30
Fault Finding 32
Safety Informaon 33

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Thank you for selecng the R-Tech MTS251-TFT Digital MIG, DC TIG & MMA Welder.
The MTS251-TFT has many benets over tradional welders, including colour screen with easy
navigaon & EASY SETUP, 20 memory stores, MIG welding with oponal spool on gun, DC HF
TIG pulse welding with spot and tack funcons, remote foot pedal opon and an industrial 35%
duty cycle.
We want you to take as much pride in operang our MTS251-TFT Digital as much pride as we
have in making this product for you. Please read all informaon in this manual before operaon
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
transportaon company used.
Please record your equipment idencaon below for future reference. This informaon can be found
on data plate at rear of machine.
Product: MTS251-TFT
Serial No.
Date of Purchase
Where Purchased
Whenever you request replacement parts or informaon on this equipment please always supply
informaon you have recorded above
Pay parcular aenon to the safety instrucons we have provided you for your protecon The level of
seriousness to be applied to each secon is explained below
This statement appears where the informaon must be followed exactly to avoid serious per-
sonal injury.
CAUTION
This statement appears where the informaon must be following to avoid a minor personal inju-
ry or damage to this equipment.

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Introducon
The R-Tech MTS251-TFT digital MIG - MMA - DC TIG welder is a member of our eld acclaimed family of
welding machines. Premium features include
Large TFT Screen
35% Industrial duty cycle
Inverter power source - more ecient
Electronic HF for fast arc starng in DC TIG and low interference
EASY SETUP MIG - MMA - DC TIG
Professional weld sengs built in
Sengs from 1.0 to 8mm pre-installed for easy setup
Simple to use easy navigaon - no complicated menus - all sengs on single screen.
MANUAL MODE DC TIG
Full control of every weld parameter you could ever need
Pre-ow gas, start amps, slope up me, main amps, slope down me, end amps and post ow gas
2 Start modes - HF Fast start & LIFT
2T, 4T, foot pedal & torch switch control modes
4TS trigger mode, Ideal for pipe welding, switch from start to main amps as required
DC Pulse up to 150Hz
20 professional memory stores
Spot welding - Spot weld feature with sch funcon
Fast Tack welding - Tack weld feature with stch funcon
Welding Capability – Duty Cycle
The R-Tech MTS251-TFT 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 unl the machine cools.

6
Safety Precauons
Read enre secon before starng installaon.
Warning!
Electric Shock can kill – Only qualied personnel should perform this installaon. 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 naonal recommended standards.
Select suitable locaon
Place the welder where clean cooling air can freely circulate in and out of the front & rear louvre 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 precauons can result in excessive operang temperatures which can lead
to plant failure.
Grinding
Do not direct grinding parcles towards the welder.
An abundance of conducve material can cause plant failure.
Transport & unloading
Never underesmate the weight of equipment, never move or leave suspended in the air above people.
Use recommended liing/handling equipment at all mes.

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Electrical installaon
WARNING ELECTRIC SHOCK CAN KILL
Electric Shock can kill – Only qualied personnel should perform this installaon. 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 naonal recommended standards.
Machine grounding and High Frequency Interference Protecon
This welder must be grounded to earth. See naonal electrical codes for proper grounding methods.
The high frequency generator being similar to a radio transmier 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-radiaon by un-grounded metallic objects.
Keeping these contribung factors in mind, installing equipment as per following instrucons 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 praccal.
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 connecon to work in good condion – Clean area on workbench where earth clamp is
situated on a regular basis.

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Electrical installaon cont.
Input Connecons
Make sure the voltage, phase and frequency of input power is as specied on machine rang
plate located at rear of machine.
Have a qualied electrician provide suitable input power as per naonal electrical codes. Make
sure machine is earthed / grounded.
Make sure fuse or circuit breaker is correct rang 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 instrucons 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 qualied 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 MTS251-TFT requires a 240V 50/60Hz supply. It requires a 32A supply. It comes with a 2.5
metre mains cable aached.
Connect wires according to naonal coding.
Brown wire – Live
Blue wire – Neutral
Green/Yellow Wire – Earth (Ground)
Connecng to an Engine Driven Generator
If connecng this machine to an engine driven generator please ensure the following
Minimum Generator KVA Output – 10 KVA connuous Generator to be ed with AVR (automac
voltage regulaon) DO NOT USE ON A GENERATOR WITHOUT AVR
Connecng to a generator without the above minimum requirements will in- validate your war-
ranty.

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Input 240V AC 50/60Hz Input amperage 32A
Gross weight 28 KG
Dimensions 470H x 280W x 640L (mm)
Insulaon IP21S
MIG Operaon Current range DC 30A - 250A
No load voltage 85V
Duty cycle 35% @ 250A, 60% @200A
MIG EASY SETUP - Programs for Wire Type - Mild steel .6mm 0.8, 1, 1.2, 1.5, 2mm
Wire Type - Mild steel .8mm 0.8, 1, 1.2, 1.5, 2, 3, 4mm
Wire Type - Mild steel 1.0mm 0.8, 1, 1.2, 1.5, 2, 3, 4, 5, 6, 7, 8mm
Wire Type - Stainless steel .6mm 0.8, 1, 1.2, 1.5, 2mm
Wire Type - Stainless steel .8mm 0.8, 1, 1.2, 1.5, 2, 3, 4mm
Wire Type - Stainless steel 1.0mm 0.8, 1, 1.2, 1.5, 2, 3, 4, 5, 6, 7, 8mm
Wire Type - Flux cored steel .8mm 1.5, 2, 3, 4, 5mm
Wire Type - Flux cored steel 1.0mm 1.5, 2, 3, 4, 5, 6, 8mm
Wire Type - Aluminium .8mm 1.5, 2, 3, 4mm (for spool gun)
MIG Manual sengs Pre-ow gas me 0 - 10s
Upslope 0 - 1s
Inductance 0 - 100
Spot me .5 - 15s
Stch me 0 - 15s
Burnback 0 - 2s
Downslope 0 - 1s
Post ow gas me 0 - 10s
Trigger modes Manual mode 2T,4T
Spool gun mode Yes
Technical specicaons

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DC TIG Operaon Current range DC 10A - 250A
No load voltage 78V
Duty cycle 35% @ 250A, 60% @200A
Arc starng modes HF, Li
Trigger modes Manual mode 2T,4T,4TS, REMOTE PEDAL,2T+F, 4T+F
Trigger modes EASY SETUP 2T,4T, REMOTE PEDAL, 2T+F, 4T+F
TIG EASY SETUP DC - Programs for Metal type Steel
Metal thickness programs 1.6 Tungsten 1, 1.2, 1.5, 2, 3mm
Metal thickness programs 2.4 Tungsten 1, 1.2, 1.5, 2, 3, 4, 5, 6, 8mm
TIG DC Manual sengs Pre-ow gas 0 - 10 seconds
Up-slope / Downslope me 0 - 10 seconds
Start / End amps 10A
Post-ow gas me 0 - 10 seconds
DC Pulse amps 3 - 95%
DC Pulse width (me) 5 - 95%
DC Pulse Hz 0.5 - 150 Hz
Memory sengs YES - 20
TIG DC Manual SPOT Mode Spot weld me 0.1 - 10 seconds
Spot weld stch me 0 - 5 seconds
TIG DC Manual TACK Mode Tack weld me 10ms - 250ms
Tack weld sch me 10ms - 250ms
MMA EASY DC - Programs for Rod types mild steel 6011, 6013, 7014, 7018
Rod diameter 2.4, 3.2, 4.0mm
2.4mm thickness programs 1.5, 2, 3, 4, 6mm
3.2 mm thickness programs 3, 4, 5, 6, 8mm
4 mm thickness programs 4, 5, 6, 8, 10mm
MMA Manual DC Amp range 10 - 200A
Duty cycle MMA 35% @ 200A, 60% @160A
An sck YES
Hot start me 0 - 2 seconds
Hot start % 0 - 100%
Arc Force 0 - 100%
Cellulosic Rods YES
Technical specicaons