CARBONE MTS250PHF User manual

MTS250PHF IGBT INVERTER
DC-MMA/TIG/CO2
WELDING MACHINE
(Suitable for 1x110V or 1x220V)
Operators’s Manual
Safety, Setup and General Use Guide
REV.2 0 00144-16
Issue Date: May. 10, 2016
Manual No.: 0-1534
EMPRESAS CARBONE S.A.
Calle 5ta. Rio Abajo, Panamá, Panamá
Telefonos: (507) 3916309 / 3916313
www.empresascarbone.com

Dear Customer,
Thank you for selecting the our machine. We appreciate you as a customer and hope that you
will enjoy years of use from your welder.
Please go directly to the our website to register your unit and receive your warranty information. Your
unit registration is important should any information such as product updates or re-calls be issued. It is also
important so that we may track your satisfaction with our products and services. If you are unable to register
by website, contact our directly through the sales department through the main customer service number in
your country. Your unit will be registered and warranty will be issued and in full effect. Keep all information
regarding your purchase. In the event of a problem you must contact technical support before your
welder can be a candidate for warranty service and returned.
Please review the current online warranty statement and information found on the website of the
our division located in or nearest to your country. Print it for your records and become familiar of its
terms and conditions.
We offers full technical support, in several different forms. We have online support available through
email, and a welding support forum designed for customers and noncustomer interaction. Technical advisors
are active on the forum daily. We also divide our support into two divisions: technical and welding
performance. Should you have an issue or question concerning your unit, please contact performance/
technical support available through the main company headquarters available in your country. For best
service call the appropriate support line and follow up with an email, particularly if off hours, or you cannot
reach a live person. In the event you do not reach a live person, particularly during heavy call volume times,
holidays, and off hours, leave a message and your call will normally be returned within 24 hours. Also for
quick answers to your basic questions, join the company owned forum available through the website.
Should you need to call or write, always know your model name, purchase date and welder manu-
facturing inspection date. This will assure the quick and accurate customer service. REMEMBER: Be as
specific and informed as possible. Technical and performance advisors rely upon you to carefully
describe the conditions and circumstances of your problem or question. Take notes of any issues
as best you can. You may be asked many questions by the advisors to clarify prob-lems or issues
that may seem very basic. However, diagnosis procedures MUST be followed to begin the warranty
process. Advisors can't assume anything, even with experienced users, and must cover all aspects
to properly diagnose the problem. Depending upon your issue, it is advisa-ble to have basic tools
handy such as screwdrivers, wrenches, pliers, and even an inexpensive test meter with volt/ohm
functions before you call.
Let us know how we may be of service to you should you have any questions.

We want you to take pride in operating our machine as much pride as we have taken in making this
product for you. Please read all information in this manual before operation
PLEASE EXAMINE CARTON AND EQUIPMENT FOR DAMAGE IMMEDIATELY
When this equipment is shipped, title passes to the purchaser upon receipt from the courier. Consequently
all claims for material damaged in shipment must be made by purchaser against the transportation company
used.
Please record your equipment identification below for future reference. This information can be
found on data plate at rear of machine.
：
Product MTS250PHF
Serial No. ___________________________________
Date of Purchase _____________________________
Where Purchased _____________________________
Whenever you request replacement parts or information on this equipment please always supply information
you have recorded above
This product is covered by 1 years parts and labour warranty, you are responsible for costs of shipping unit
to us, we will cover cost of returning item to you. External items, torch, earth lead etc are covered by 3
months warranty. Any faults/damage found caused by customer will be charged prorata.
Pay particular attention to the safety instructions we have provided you for your protection The level of
seriousness to be applied to each section is explained below
WARNING
This statement appears where the information must be followed exactly to avoid serious personal injury.
CAUTION
This statement appears where the information must be following to avoid a minor personal injury or damage
to this equipment.

We are dedicated to providing you with the best possible equipment and service to meet the demanding
jobs that you have. We want to go beyond delivering a satisfactory product to you. That is the reason we
offer technical support to assist you with your needs should an occasion occur. With proper use and care
your product should deliver years of trouble free service.
Safe operation and proper maintenance is your responsibility.
We have compiled this operator's manual, to instruct you in basic safety, operation and maintenance of
our product to give you the best possible experience. Much of welding and cutting is based upon
experience and com-mon sense. As thorough as this welding manual may be, it is no substitute for either.
Exercise extreme caution and care in all activities related to welding or cutting. Your safety, health and even
life depends upon it. While accidents are never planned, preventing an accident requires careful planning.
Please carefully read this manual before you operate machine.
This manual is not only for the use
of the machine, but to assist in obtaining the best performance out of your unit. Do not operate the unit
until you have read this manual and you are thoroughly familiar with the safe operation of the unit. If you feel
you need more information please contact our Support.
The warranty does not cover improper use, maintenance or consumables. Do not attempt to alter or
defeat any piece or part of your unit, particularly any safety device. Keep all shields and covers in
place during unit operation should an unlikely failure of internal components result in the possible presence
of sparks and explosions. If a failure occurs, discontinue further use until mal-functioning parts or
accessories have been repaired or replaced by qualified personnel.
Note on High Frequency electromagnetic disturbances:
Certain welding and cutting processes generate High Frequency (HF) waves. These
waves may disturb sensitive electronic equipment such as televisions, radios, computers, cell
phones, and related equipment. High Frequency may also interfere with fluorescent lights.
Consult with an electrician if disturb-ance is noted. Sometimes, improper wire routing or poor
shielding may be the cause.
HF can interfere with pacemakers.See EMF warnings in following safety sec-tion for
further information. Always consult your physician before entering an area known to have
welding or cutting equipment if you have a pacemaker.
MOVING PARTS can cause injury.
Moving parts, such as fans, rotors, and belts can cut fingers and hands and catch loose
clothing.
Do not put your hands near the engine fan. Do not attempt to override the governor or idler by
pushing on the throttle control rods while the engine is running.
SAFETY PRECAUTIONS

These safety precautions are for protection of safety and health. Failure to follow these
guidelines may result in serious injury or death. Be careful to read and follow all cautions and
warnings. Protect yourself and others.
Welding and cutting processes produce high levels of ultraviolet (UV) radiation that can
cause severe skin burn and damage.There are other potential hazards involved with welding
such as severe burns and respiratory related illnesses. Therefore ob-serve the following to
minimize potential accidents and injury:
Use appropriate safety glasses with wrap around shields while in the work area, even
under welding helmets to protect your eyes from flying sparks and debris.When chip-ping
slag or grinding, goggles and face shields may be required.
When welding or cutting, always use an approved shielding device, with the correct
shade of filter installed. Always use a welding helmet in good condition. Discard any broken
or cracked filters or helmets. Using broken or cracked filters or helmets can cause severe eye
injury and burn. Filter shades of no less than shade 5 for cutting and no less than shade 9 for
welding are highly recommended. Shades greater than 9 may be required for high amperage
welds. Keep filter lenses clean and clear for maxi-mum visibility. It is also advisable to consult with your eye
doctor should you wear contacts for corrective vision before you wear them while welding.
Do not allow personnel to watch or observe the welding or cutting operation unless fully
protected by a filter screen, protective curtains or equivalent .protective equip-ment. If no
protection is available, exclude them from the work area. Even brief expo-sure to the rays from
the welding arc can damage unprotected eyes.
Always wear hearing protection because welding and cutting can be extremely noisy. E
ar protection is necessary to prevent hearing loss. Even prolonged low levels of noise has
been known to create long term hearing damage. Hearing protection also further protects
against hot sparks and debris from entering the ear canal and doing harm.
Always wear personal protective clothing. Flame proof clothing is required at all times.
Sparks and hot metal can lodge in pockets, hems and cuffs. Make sure loose clothing is tucked
in neatly. Leather aprons and jackets are recommended. Suitable welding jackets and coats
may be purchased made from fire proof material from welding supply stores. Discard any
burned or frayed clothing. Keep clothing away from oil, grease and flammable liquids.
Leather boots or steel toed leather boots with rubber bottoms are required for ade-quate
foot protection. Canvas, polyester and other man made materials often found in shoes will
either burn or melt. Rubber or other non conductive soles are necessary to help protect from
electrical shock.
Flame proof and insulated gauntlet gloves are required whether welding or cutting or
handling metal. Simple work gloves for the garden or chore work are not sufficient. Gauntlet
type welding gloves are available from your local welding supply companies. Never attempt to
weld with out gloves. Welding with out gloves can result in serious burns and electrical shock.
If your hand or body parts comes into contact with the arc of a plasma cutter or welder, instant
and serious burns will occur. Proper hand protection is required at all times when working
with welding or cutting machines!
SAFETY PRECAUTIONS

WARNING! Persons with pacemakers should not weld, cut or be in the welding area
until they consult with their physician. Some pacemakers are sensitive to EMF radiation and
could severely malfunction while welding or while being in the vicinity of someone welding.
Serious injury or death may occur!
Welding and plasma cutting processes generate electro-magnetic fields and
radiation. While the effects of EMF radiation are not known, it is suspected that there may be
some harm from long term exposure to electromagnetic fields. Therefore, certain pre-cautions
should be taken to minimize exposure:
* Lay welding leads and lines neatly away from the body.
* Never coil cables around the body.
* Secure cables with tape if necessary to keep from the body.
* Keep all cables and leads on the same side the body.
* Never stand between cables or leads.
* Keep as far away from the power source (welder) as possible while welding.
* Never stand between the ground clamp and the torch.
* Keep the ground clamp grounded as close to the weld or cut as possible.
Welding and cutting processes pose certain inhalation risks. Be sure to follow any
guidelines from your chosen consumable and electrode suppliers regarding possible need for
respiratory equipment while welding or cutting. Always weld with adequate ventilation. Never weld
in closed rooms or confined spaces. Fumes and gases re-leased while welding or cutting may be
poisonous. Take precautions at all times.
Any burning of the eyes, nose or throat are signs that you need to increase ventilation.
* Stop immediately and relocate work if necessary until adequate ventilation is ob-tained.
* Stop work completely and seek medical help if irritation and discomfort persists.
WARNING! Do not weld on galvanized steel, stainless steel, beryllium, titanium, cop-per,
cadmium, lead or zinc without proper respiratory equipment and or ventilation.
WARNING! This product when used for welding or cutting produces fumes and gas-es
which contains chemicals known to the State of California to cause birth defects and in some
§
cases cancer. (California Safety and Health Code 25249.5 et seq.)
WARNING! Do not weld or cut around Chlorinated solvents or degreasing areas. Release
of Phosgene gas can be deadly. Consider all chemicals to have potential deadly results if welded
on or near metal containing residual amounts of chemicals.
Keep all cylinders upright and chained to a wall or appropriate holding pen. Certain
regulations regarding high pressure cylinders can be obtained from OSHA or local regulatory
agency. Consult also with your welding supply company in your area for further recommendations.
The regulatory changes are frequent so keep informed.
All cylinders have a potential explosion hazard. When not in use, keep capped and closed.
Store chained so that overturn is not likely. Transporting cylinders incorrectly can lead to an
explosion. Do not attempt to adapt regulators to fit cylinders. Do not use faulty regulators. Do
not allow cylinders to come into contact with work piece or work. Do not weld or strike arcs on
cylinders. Keep cylinders away from direct heat, flame and sparks.
SAFETY PRECAUTIONS

WARNING! Electrical shock can kill. Make sure all electrical equipment is properly
grounded. Do not use frayed, cut or otherwise damaged cables and leads. Do not stand, lean
or rest on ground clamp. Do not stand in water or damp areas while weld-ing or cutting. Keep
work surface dry. Do not use welder or plasma cutter in the rain or in extremely humid
conditions. Use dry rubber soled shoes and dry gloves when welding or cutting to insulate
against electrical shock. Turn machine on or off only with gloved hand. Keep all parts of the
body insulated from work, and work tables. Keep away from direct contact with skin against
work. If tight or close quarters ne-cessitates standing or resting on work piece, insulate with
dry boards and rubber mats designed to insulate the body from direct contact.
All work cables, leads, and hoses pose trip hazards. Be aware of their location and
make sure all personnel in area are advised of their location. Taping or securing ca-bles with
appropriate restraints can help reduce trips and falls.
WARNING! Fire and explosions are real risks while welding or cutting. Always keep
fire extinguishers close by and additionally a water hose or bucket of sand. Periodi-cally check
work area for smoldering embers or smoke. It is a good idea to have someone help watch for
possible fires while you are welding. Sparks and hot metal may travel a long distance. They
may go into cracks in walls and floors and start a fire that would not be immediately visible.
Here are some things you can do to reduce the possibility of fire or explosion:
* Keep all combustible materials including rags and spare clothing away from area.
* Keep all flammable fuels and liquids stored separately from work area.
* Visually inspect work area when job is completed for the slightest traces of smoke or embers.
* If welding or cutting outside, make sure you are in a cleared off area, free from dry tender and
debris that might start a forest or grass fire.
* Do not weld on tanks, drums or barrels that are closed, pressurized or anything that held
flammable liquid or material.
Metal is hot after welding or cutting! Always use gloves and or tongs when handling hot
pieces of metal. Remember to place hot metal on fire-proof surfaces after han-dling. Serious
burns and injury can result if material is improperly handled.
WARNING! Faulty or poorly maintained equipment can cause injury or death. Prop-
er maintenance is your responsibility. Make sure all equipment is properly maintained and
serviced by qualified personnel. Do not abuse or misuse equipment.
Keep all covers in place. A faulty machine may shoot sparks or may have exploding parts.
Touching uncovered parts inside machine can cause discharge of high amounts of electricity.
Do not allow employees to operate poorly serviced equipment. Always check
condition of equipment thoroughly before start up. Disconnect unit from power source before
any service attempt is made and for long term storage or electrical storms.
Further information can be obtained from The American Welding Society (AWS) that
relates directly to safe welding and plasma cutting. Additionally, your local welding supply
company may have additional pamphlets available concerning their products. Do not operate
machinery until your are comfortable with proper operation and are able to assume inherent
risks of cutting or welding.
SAFETY PRECAUTIONS

TABLEOFCONTENTS
Page
SAFETY PRECAUTIONS................................................. .
Installation.....................................................Section A
Technical Specifications...............................................A-1
Output Amps %duty cycle ...............................................A-2
Select Suitable Location...............................................A-3
Stacking ..............................................................A-3
TRANSPORT - UNLOADING ............................................A-3
Tilting. ..............................................................A-3
Environmental Area ....................................................A-3
Machine Grounding and High Frequency Interference Protection .........A-4
Input Connections ...................................................A-4
Reconnect Procedure....................................................A-5
220/230/240V Input.....................................................A-5
110/115/120V Input.....................................................A-5
Attachment Plug Installation, Engine Driven Generator..................A-5
Output Connections.....................................................A-6
Output and Gas Connection for TIG Welding..............................A-6
Work Cable Connection .................................................A-6
Output and Gas Connection for MIG Welding..............................A-6
Quick Disconnect Plug .................................................A-6
Shielding Gas Connection...............................................A-6
Output Connection for Stick Welding ...................................A-7
Operation.......................................................Section B
Safety precautions.....................................................B-1
Product Description....................................................B-2
Welding Capability.....................................................B-2
Limitations ...........................................................B-2
Control Panel .....................................................B-3
Controls and Settings, ....... ....................................... B-3
Operating steps........................................................B-8
Welding in MIG mode ................................................ .B-8
Welding in TIG mode ................................................ .B-14
Welding in MMA mode ................................................ .B-20
Maintenance .....................................................Section C
Safety Precautions ....................................................C-1
Routine and periodic Maintenance.......................................C-1
Troubleshooting .................................................Section D
How to Use Troubleshooting Guide ......................................D-1
Input Filter Capacitor Discharge Procedure ............................D-1
Troubleshooting Guide........................ ... ........ ...........D-2
Wiring Diagram...................................................Section E
Main circuit wiring Diagram............................................E-1
Accessories......................................................Section F
Parts Lists(COMPONENT LISTS)..................................... Appendix

A-1 INSTALLATION A-1
TECHNICAL SPECIFICATIONS -
max. rated Output Amps @% Duty Cycle (Based on a 10 minute cycle) (Example; 250A@35% for MIG&TIG
and 200A@35% for DC Stick)
MODEL MTS250PHF
Voltage 1 xAC110V 50/60Hz 1 xAC220V 50/60Hz
Rated Input current 39 A 40 A
Rated Input power 4.3KVA 9KVA
INPUT
Fuse rating 40A 40A
No-load Voltage 60V
current Adjusting Range 10~150A 10~250A
Rated Output Current 150A 250A
down/up slope time adjusting
Range 0-10s
pulse freq. 0.5~500Hz
base/pulse ratio 5~95%
base/pulse amps 3~95%
TIG
Rated Duty Cycle 35%
No-load Voltage 60V
current Adjusting Range 10~120A 10~200A
Rated Output Current 120A 200A
MMA
Rated Duty Cycle 35%
No-load Voltage 60V
down/up slope time adjusting
Range 0-1s
pulse freq. 10~250Hz
base/pulse ratio 10~90%
base/pulse voltage 10~100%
Voltage Adjusting Range 15.5~22V 15.5~30V
Rated Output Current 150A 250A
Current Range 30~150A 30~250A
Rated Duty Cycle 35%
wire speed Adjusting Range 60~400IPM 60~600IPM
MIG
Suitable wire 0.024'',0.030'',0.035'',0.045''
Pre gas Flow Time 0~10s
Post gas Flow Time 0~10s
Efficiency ≥80%
Mass 30kg
Protection Class of enclosure IP21S

A-2 INSTALLATION A-2
Chart gives max. rated Output Amps @% Duty Cycle (Based on a 10 minute cycle) (Example; 250A@35%
for MIG&TIG and 200A@35% for DC Stick)
TIG&MIG
STICK(MMA)
(1)
Wiring and protection based on the IEC60974.1 National Electric Code: Use a Super Lag type fuse or circuit
breaker with a delay in tripping action. Models with NEMA 6-50P plug may be used with a 50 amp protected
6-50R receptacle, or with a maximum 70 amp protected 6-50R receptacle if dedicated for the welder.
120 140 160 180 200 220 240 260
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
OUTPUT AMPS
OUTPUT AMPS %DUTY CYCLE
Using standard input cable for protected input supply

A-3 INSTALLATION A-3
SAFETY PRECAUTIONS
Read entire installation section before starting installation.
ELECTRIC SHOCK can kill.
·Only qualified personnel should
perform this installation.
·Turn the input power OFF at the
disconnect switch or fuse box
before working on this equipment.
·Do not touch electrically hot parts.
·Always connect the MACHINE to a power
supply grounded per the National Electrical
Code and any local codes.
SELECT SUITABLE LOCATION
Place the welder where clean cooling air can freely
circulate in and out through the rear louvers. Dirt,
dust or any foreign material that can be drawn into
the welder should be kept at a minimum. Failure to
observe these precautions can result in excessive
operating temperatures and nuisance shut-downs.
GRINDING
Do not direct grinding particles towards the welder.
An abundance of conductive material can cause
maintenance problems.
STACKING
The machine cannot be stacked.
TRANSPORT - UNLOADING
Never underestimate the weight of the
equipment.
Never make the cargo pass or leave it
suspended over people or things.
Neither let the equipment or the single unit fall,
nor put it down with force.
Once it has been removed from the packing, the
power source can be used to move it in the
hand or on the shoulder.
Never lift welder with gas cylinder attached.
Never lift welder above personnel.
TILTING
Each machine must be placed on a secure, level
surface, either directly or on a recommended
undercarriage. The machine may topple over if this
procedure is not followed. 10o
ENVIRONMENTAL RATING
The welding machine power source carries an
IP21s environmental rating. It may be used in
normal industrial and commercial environments.
Avoid using it in environments which have falling
water such as rain.
Read and follow "Electric Shock Warnings" in the
Safety section if welding must be performed under
electrically hazardous conditions such as welding in
wet areas or on or in the workpiece.
FALLING
EQUIPMENT
cause injury

A-4 INSTALLATION A-4
MACHINE GROUNDING AND HIGH
FREQUENCY INTERFERENCE
PROTECTION
This welder must be grounded! See your local and
national electrical codes for proper grounding
methods.
The high frequency generator, being similar to a
radio transmitter, may cause radio, TV and
electronic equipment interference problems. These
problems may be the result of radiated interference.
Proper grounding methods can reduce or eliminate
radiated interference.
Radiated interference can develop in the following
four ways:
1 Direct interference radiated from the welder.
2 Direct interference radiated from the welding
leads.
3 Direct interference radiated from feedback into the
power lines.
4 Interference from re-radiation of "pickup" by
ungrounded metallic objects.
Keeping these contributing factors in mind, installing
equipment per the following instructions should
minimize problems.
1 Keep the welder power supply lines as short as
possible and enclose as much of them as possible
in rigid metallic conduit or equivalent shielding for a
distance of 50 feet (15.2m). There should be good
electrical contact between this conduit and the
welder case ground. Both ends of the conduit
should be connected to a driven ground and the
entire length should be continuous.
2 Keep the work and electrode leads as short as
possible and as close together as possible. Lengths
should not exceed 25 ft (7.6m). Tape the leads
together when practical.
3 Be sure the torch and work cable rubber
coverings are free of cuts and cracks that allow high
frequency leakage.
4 Keep the torch in good repair and all connections
tight to reduce high frequency leakage.
5 The work piece must be connected to an earth
ground close to the work clamp, using one of the
following methods:
a) A metal underground water pipe in direct contact
with the earth for ten feet or more.
b) A 3/4" (19mm) galvanized pipe or a 5/8"
(16mm)solid galvanized iron, steel or copper rod
driven at least eight feet into the ground.
The ground should be securely made and the
grounding cable should be as short as possible
using cable of the same size as the work cable, or
larger. Grounding to the building frame electrical
conduit or along pipe system can result in
reradiation, effectively making these members
radiating antennas.
6 Keep cover and all screws securely in place.
7 Electrical conductors within 50 ft (15.2m) of the
welder should be enclosed in grounded rigid
metallic conduit or equivalent shielding, wherever
possible. Flexible metallic conduit is generally not
suitable.
8 When the welder is enclosed in a metal building,
the metal building should be connected to several
good earth driven electrical grounds (as in 5 (b)
above) around the periphery of the building.
Failure to observe these recommended installation
procedures can cause radio or TV and electronic
equipment interference problems and result in
unsatisfactory welding performance resulting from
lost high frequency power.
INPUT CONNECTIONS
Be sure the voltage, phase, and frequency of the
input power is as specified on the rating plate,
located on the rear of the machine.
Have a qualified electrician provide input power
supply to the receptacle or cord in accordance with
all local and national electrical codes. Use a single
phase line or one phase of a two or three phase
line.
Choose an input and grounding wire size according
to local or national codes. Refer to the Technical
Specifications page at the beginning of this section.
Fuse the input circuit with the recommended super
lag fuses or delay type circuit breakers.

A-5 INSTALLATION A-5
Using fuses or circuit breakers smaller than
recommended may result in "nuisance" shut-off
from welder inrush currents even if not welding at
high currents.
1Also called "inverse time" or "thermal/magnetic" circuit
breakers; circuit breakers which have a delay in tripping action
that decreases as the magnitude of the current increases.
INPUT RECONNECT PROCEDURE
On multiple input voltage welders, be sure the
machine is connected per the following instructions
for the voltage being supplied to the welder.
Failure to follow these instructions can cause
immediate failure of components within the welder
and void machine's warranty.
Multiple voltage models are shipped connected for
the highest voltage. To change this connection refer
to the following instructions.
ELECTRIC SHOCK can kill.
Turn the input power OFF at the
disconnect switch or fuse box
before working on this equipment.
. Have a qualified electrician
install and service this
equipment.
. Turn the input power OFF and unplug the
machine from the receptacle
before working on 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 hot parts.
. Machine must be plugged into a receptacle
that is grounded according to the National
Electrical Code and local codes.
. Do not remove or defeat the purpose of the
power cord ground pin.
RECONNECT PROCEDURE
The Inverter machine auto reconnects to either
115V or 230V supply.
Fuse the input circuit with time delay fuses or delay
type1 circuit breakers. Using fuses or circuit
breakers smaller than recommended may result in
“nuisance”shut-offs from welder inrush currents
even if not welding at high currents.
The Inverter machine is recommended for use on
an individual branch circuit.
1Also called“inverse time”or“thermal/magnetic”
circuit breakers.
These circuit breakers have a delay in tripping
action that decreases as the magnitude of the
current increases.
220/230/240V INPUT
The equipment is provided with a 230/115V cable,
6.6ft.(2m) in length with a 230V 6-50P attachment
plug.
The Inverter machine performs best when
connected to 230VAC inputs. This input allows full
output of the machine (250 amps).
110/115/120V INPUT
A suitable 115V attachment plug must be installed
on the power cord to use the inverter machine with
a 115V input supply. The rated output of the inverter
machine is available when connected to a 30A
branch circuit. When connected to a branch circuit
with lower amp rating, lower welding current and
duty cycle must be used. An output guide is
provided below. The values are approximate and
must be adjusted downward if the fuse or circuit
breaker trips off. Other loads on the circuit and
fuse/circuit breaker characteristics will affect the
available output. Do not exceed these welding
conditions:
ATTACHMENT PLUG INSTALLATION
Connect the white (neutral) wire under terminal
clamp with silver screw, and black (hot) wire under
terminal clamp with brass screw. Connect green
wire under terminal clamp with green screw.
. Failure to wire as instructed may cause
personal injury or damage to equipment.
To be installed or checked by an
electrician or qualified person only.
In all cases, the green or green/yellow grounding
wire must be connected to the grounding pin of the
plug, usually identified by a green screw.
Attachment plugs must comply with the Standard
for Attachment Plugs and Receptacles,.
The product is considered acceptable for use only
when an attachment plug as specified is properly
attached to the supply cord.
For use on engine drives, keep in mind the above
input draw restrictions and the following precaution.

A-6 INSTALLATION A-6
ENGINE DRIVEN GENERATOR
The Inverter machine can be operated on engine
driven generators as long as the 220/230/240 volt
auxiliary meets the following conditions:
. The AC waveform peak voltage is below 400 volts.
. The AC waveform frequency is between 45 and
65Hz.
The following Lincoln engine drives meet these
conditions when run in the high idle mode:
●Ranger 250,305 ●. Commander 300, 400, & 500
Some engine drives do not meet these conditions
(e.g. Miller Bobcats, etc). Operation of the Inverter
machine is not recommended on engine drives not
conforming to these conditions. Such drives may
deliver unacceptably high voltage levels to the
Inverter machine power source.
CONNECTIONS FOR TIG (GTAW) WELDING
TIG TORCH CONNECTION
Refer to Included Equipment in the Operation
Section of this manual for TIG welding
equipment which is included with the machine
The TIG Torch Twist-Mate and work cable
Twist-Mate Connectors are supplied with the welder.
To connect the cables, turn the Power Switch
“OFF”. Connect the torch cable Twist-Mate plug
into the DC(-)
Electrode Receptacle on the front of the welder and
turn it clockwise until snug,(Do not Over tighten).
This is a quick connect terminal
To avoid receiving a high frequency shock, keep
the TIG torch and cables in good condition.
WORK CABLE CONNECTION
Next, connect the work cable to the “+”output
terminal in the same way.
To minimize high frequency interference, refer to
Machine Grounding and High Frequency
Interference Protection section of this manual for
the proper procedure on grounding the work clamp
and work piece.
CONNECTIONS FOR MIG WELDING
SHIELDING GAS CONNECTION
Obtain the necessary inert shielding gas (usually
argon). Connect the cylinder of gas with the
pressure regulator and flow gage. Install the gas
hose between the regulator and gas inlet (located
on the rear of the welder).
CYLINDER could explode if damaged.
Keep cylinder upright and chained to a
support.
Keep cylinder away from areas
where it could be damaged.
Never allow the torch to touch
the cylinder.
Keep cylinder away from live
electrical circuits.
Maximum inlet pressure 60 psi.
A cylinder is loaded by leaning it slightly sideways
and rocking it up on the platform, being careful not
to allow the Under-Storage Cart to roll. Secure the
cylinder in place with the provided chain. Unload by
following these steps in reverse.
ADJUSTABLE FOOT CONTROL CONNECTION
A Adjustable foot control receptacle is provided on
the case front of the welder for connecting a remote
control to the machine.
workpiec
GAS
Cylinder
torch
0
4
12
1
3
1
5
1
6
19 2
6
01
0
3
0
5
0
6
0
7
0
8
09 10
11

A-7 INSTALLATION A-7
CONNECTIONS FOR STICK (SMAW) WELDING
A. POSITIVE CONNECTION B . NEGATIVE CONNECTION
STICK ELECTRODE CABLE AND WORK CABLE
CONNECTION
Refer to Field Installed Options in Accessories
Section of this manual for STICK welding
equipment which is available for use with the
inverter machine. An electrode holder with
Twist-Mate cable and Twist-Mate connector are
available separately for use with the inverter
machine.. Turn the Power Switch "OFF". Connect
the Twist-Mate quick connect plug into the
Electrode and turn it clockwise until it is tight. The
work cable and work clamp are factory connected.

B-1 OPERATION B-1
Read and understand this entire section
before operating the machine.
SAFETY PRECAUTIONS
ELECTRIC SHOCK can kill.
· Do not touch electrically
live parts or electrode with
skin or wet clothing.
· Insulate yourself from
work and ground.
· Always wear dry insulating gloves.
Read and follow "Electric Shock Warnings" in the
Safety section if welding must be performed under
electrically hazardous conditions such as welding in
wet areas or on or in the workpiece.
FUMES AND GASES can be dangerous.
· Keep your head out of
fumes.
· Use ventilation or exhaust
at the arc, or both, to
remove fumes and gases
from breathing zone and general area.
WELDING SPARKS can cause fire or
explosion
· Keep flammable material
away.
· Do not weld on containers
that have held combustibles.
RC RAYS can burn.
Wear eye, ear and body
protection.
Only qualified personnel
should operate this equipment. Observe
additional Safety Guidelines detailed in
the beginning of this manual.

B-2 OPERATION B-2
PRODUCT DESCRIPTION
The MTS250PHF is a versatile and compact MIG/Stick welder
capable of delivering professional quality welds. Operating on
an input of 110V or 220V 50/60Hz (1 phase), the CC/CV IGBT
inverter welder is perfectly suited for many MIG and Stick
welding tasks anywhere power is available. The MTS250PHF
can be used with .023”-.045” wire and features an 8” diameter
spool capacity. (Requires additional drive rollers.) The welder
is equipped with these standard features:
1) GMAW Process (MIG). The digitally controlled MIG
components precisely control arc functions and give real-time
feed back about the welding output parameters. The welder is
also spool gun ready for economical welding of Stainless and
Alu-minum wires if needed. (Spool gun is optional.) It also may
be used with flux core wire when equipped with the optional
flux core drive wheel.
2) SMAW (Stick). In stick mode the welder delivers a smooth
DC low spatter arc. Professional, high-quality welds are
obtainable with ER 7018, 7014, 309L, 316, 6011 and many
specialty rods that are designed for use with any stick welder.
3) Arc Force Control. Used with both MIG and Stick functions,
the arc force control adjusts the quality of the arc. In MIG
mode, the arc force control is used to adjust the current rise
time. This determines how wet or stiff the arc feels and the
pinch point of the wiring as it feeds into the puddle. In Stick
mode, the arc force is used to adjust the amp reaction by
adjusting how much the amps are boosted when the arc is
held close and voltage drops below 20 Volts. This helps
prevent rod sticking. Just as in MIG mode, in Stick mode, the
Arc force helps change the way the arc feels and re-acts. This
feature is sometimes referred to as “dig”.
4) Burn Back Control. Burn back control is used to control
the length of the wire stick out after the trigger is released. It
helps prevent sticking of the wire to the weld and saves the
user from having to trim the wire before restarting.
Either coated (copper or other coatings) or uncoated
steel wire may be used for welding steel as long as it
remains rust-free and clean.
.NOTE: For flux core use, special drive rolls with a
serrated design may be purchased from our company.
PROCESS LIMITATIONS
The machines are not recommended for arc gouging due to
it's limited output capacity, and are also not recommended for
pipe thawing.
RECOMMENDED QUIPMENT/INTERFACE
(See Installed Options in Accessories Section for more details)
The machines will be available as a basic Machine (Only) and
in Factory Basic module will also be available as with
Domestic,.
(SEE PACKING LIST,PLEASE)
EQUIPMENT LIMITATIONS
The machines are protected from over loads beyond the
output ratings and duty cycles, per the Specifications in the
Installation Section, with Thermostat protection of the output
power coils and rectifiers.
WELDING CAPABILITY(Duty Cycle)
The machine is rated at 250Amps, 26.5V, at 3% duty cycle on
a ten minute basis. It is capable of higher duty cycles at lower
output currents. See rated output graph, on specification sheet
located in the Installation Section. If the duty cycle is
exceeded, a thermal protector will shut off the output until the
machine cools.

B-3 OPERATION B-3
CONTROLS AND SETTINGS
FIGURE B.1 CONTROL PANEL
FRONT PANEL
1Voltage/MMAarcforce/updownslope/post/preflowtimeet.Displaymeter
a、ThemeteronthefrontpanelcanindicatetheactualweldingvoltageorpresetMIGvoltage.The
indicatingnumberhastheprecisionof0.1V.Themeterindicatesthepresetduringnowelding.
b、displayMIGup&downslopetime/post&preflowtime/MIGburnbacktime/hotstarttime
c、displayMMAarcforce/MIGinductance/pulsetimeon/hotstartcurrent/(base/pulse)percent
2Current/wirespeed/pulsefreq.Displaymeter
Thecurrentindicatingmeteronthefrontpanelindicatestheactualweldingcurrentduringthewelding，
indicatesthepresetcurrentduringnowelding.
3Powerindicating
Iftheindicatinglightisonthecontrolcircuitconnectsthepoweralready.
4second:unitofTIG/MIGup&downslopetime/post&preflowtime/MIGburnbacktime/hotstart
timepercent:unitofMMAarcforce/MIGinductance/pulsetimeon/hotstartcurrent/(base/pulse)
5in/min:unitofwirespeed
hz/pps:unitofpulsefreq.
6unitofcurrent
7MIG(std.syn.pulse)ProcessSelector
8unitofvoltage
9DataDisplayAdjustmentKnob
Adjustthecorrespondingvaluesaccordingtotheselectedparametersled.
Whileledlighting,thisadjusts.



B-4 OPERATION B-4

10DutyCycle/OvercurrentWarning.
Whenthedutycyclehasbeenexceededoran
overcurrent,conditionhasoccurred,theL.E.D.will
light.Allowtheunittocoolwhilerunninguntil
thelightgoesofforfor10minutesbefore
resettingthewelder.Ifconditionpersistscheck
forloosewiresorvoltagesupplyproblems.

11MMAProcessSelector
12MemorychanelLED
13CH(chanel)/SAVEProcessSelector
ledofthe"CH(chanel)"lightingwhenyoupress
orpress"3s"untiltheledof"SAVE"you
havesavedthedata.
14STICKmodeSelector
152T/4TTorch/PEDALSwitch&remotebox
Selector
16MIGinductance/MIGpreflow/MIG
up‐slope/MIGwirespeed(STICKamps)/MIG
Volts/MIGpulsevolts/pulsetimeon/base/pulse
ratio/pulsefreq./MIGdown‐slope/MIGpostflow
/MIGburnbacktimeparametersled
Ineachmode,thefunctionofthecontrolchanges.
IntheMIGmode,thecontrolisusedtoadjust
thearcvoltage/upslope/downslope/pre
flow/postflowtime.InStickmode,thecontrol
isusedtovarytheautomaticarcforcecurrent
response.Whenusedforstickweldingthearc
forceisalsoknownas“dig”.Whenweldinginstick
mode,thecurrentisincreasedasthevoltsfalloff
duetoashortarclength.Thishelpsmaintainthe
arcbyprovidingmorewattage.
17WireAlloySelector.
Selectyourwiretypeaccordingtothebasic
categoriesofFe(Steel),Ss(StainlessSteel)orAl
(Aluminum).Thisinputmustbemadeto
properlyusetheSynergicfunctionto
automaticallyadjusttheVoltsneededtoweldat
theselectedwirespeed.
18WireDiameterselector:
Selectyourwirediameteraccordingofthetype
wireyouareusing.Selectingthecorrectwire
diameteriscriticaltooptimumSynergicfunction
ofthewelder,automaticallycompensatingthe
voltagewhilethewirespeedisadjusted.This
willallowforfull,independentcontrolofMIGwire
speedandvoltage.
19TIGstartSelector
20TIGProcessSelector

B-5 OPERATION B-5
SIDE VIEW