Inverter Fusion MMA 250 User manual

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MMA INVERTER WELDER
Instruction Manual
MMA 250

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CONTENTS
GUARANTEE………………………………………………………………………………….3
INTRODUCTION………………………………………………………………………………3
SAFETY PRECAUTIONS…………………………………………………………………….4
TECHNICAL DATA……………………………………………………………………………5
INSTALLATION………………………………………………………………………………..6
Connection…………………………………………………………………………………6
Checking…………………………………………………………………………………...7
OPERATION…………………………………………………………………………………...7
Instructions………………………………………………………………………………...7
Duty Cycle…………………………………………………………………………………7
CAUTION………………………………………………………………………………………8
Working Environment……………………………………………………………………..8
Safety Tips…………………………………………………………………………………8
MAINTENANCE……………………………………………………………………………….9
TROUBLESHOOTING………………………………………………………………………..9
WARRANTY………………………………………………………………………………10-11

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INTRODUCTION
The introduction of the inverter welders is considered as a revolution in the welding industry.
The features of the MMA series is: perfect functions and satisfying all kinds of welding
needs, especially places requiring welding of high quality, e.g. pipes, boilers or vacuum
compressing container.
1. Maintenance for the machine is one year, excluding other spare parts.
2. During the maintenance period, all maintenance is for free except intentional
damage.
3. Customers are not allowed to unfold and refit or change the parts. Any damage
caused to the machines is not the responsibility of Inverter Fusion Ltd.
SAFETY
Caution
•You may be faced with dangers during the course of welding, so please read the
manuals carefully before commencing operation.
•Please use welding tools of high quality.
•Operators should be qualified for welding.
Electric-shock
•Do not touch live electrical parts
•Check and be sure that the input power cable earth wire is properly connected to the
earth in the mains input plug.
GUARANTEE
We give our unreserved guarantee that the Inverter Welding and Cutting Power
Source series comply with IEC60974 international safety standard.
Maintenance for one year since the date of purchase.

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•Insulate yourself from work and ground using dry insulating mats or covers big
enough to prevent any physical contact with the work or ground.
Smoke
•Avoid a prolonged period in the smoke
•When welding, make sure you are in a well-ventilated area to avoid breathing in the
smoke.
Arc-emission
•Wear suitable welding mask and clothing to protect your eyes and skin.
•Use a suitable screen or curtain.
•The welding splash may cause fire, so ensure that there are no flammable things
near to the work place.
Noise
•Use approved earplugs or earmuffs if noise level is high.
•Warn others nearby about noise hazard.
一、
一、一、
一、
二、
二、二、
二、

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TECHNICAL DATA
DATA 250 MMA
Input power voltage （
（（
（ V 、
、、
、 Hz ）
））
） Three phase
AC380 ± 10% 50/60
Rated input current （
（（
（ A ）
））
） 15
Rated output voltage (V) 30
Output current adjustment （
（（
（ A ）
））
） 20-250
ARC force （
（（
（ A ）
））
） 0-100
Duty cycle % 60
No-load voltage （
（（
（ V ）
））
） 54
No-load loss （
（（
（ W ）
））
） 60
Efficiency % 85
Power factor 0.93
Insulation class B
Protection class IP21
Weight （
（（
（ kg ）
））
） 15
Size （
（（
（ mm ）
））
） 480 x 210 x 310

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INSTALLATION
Connection of the power wires
1）The machine is equipped with primary power wire, according to the input voltage;
please connect the primary wire to the suitable voltage class.
2）The primary wire should be connected to the corresponding socket to avoid
oxidization.
3）Use multimetres to see whether the voltage value varies in the given range.
Connection of output wires
1) Each welder has two sockets, connect the plug to the socket on the front panel, and
tighten it and make sure that it is fully connected, or it may cause damage to both the
plug and socket.
2) The electrode holder wire is connected to the positive terminal, while the work
piece is connected to the negative terminal.
3) If the work piece is too far away from the machine（50-100m) and the secondary

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wire is too long, the section of the cable should be bigger to reduce a decrease in
the voltage in the cable.
Checking
1）Whether the machine is connected to standard to earth.
2）Whether all the connections are fully connected.
3）Whether the output of the electrode holder and earth cable is short-circuited.
4）Whether the pole of the output is correct.
5）The welding splash may cause fire, so make sure there are no flammable
materials nearby.
OPERATION
Operation instructions
1. Turn on the power switch, and the meter indicates the set current value, and
the fan begins to spin.
2. According to practical need, adjust the “welding current knob”and “the
arc-leading pulse knob”to the welding requirement.
3. Generally, the welding current of each wire is:
Ф
ФФ
Ф2.5: 70-100A; Ф
ФФ
Ф3.2: 110-160A;
Ф
ФФ
Ф4.0: 170-220A; Ф
ФФ
Ф5.0: 230-280A.
4. Place the switch on“OFF”when not use the remote control, or you cannot adjust
the current on the panel board.
Allowed duty cycle
1. Strictly work in conformity with the required duty cycle.
2. If work over duty cycle, the machine may suddenly stop working. That’s the
inner thermal parts work because of over-loading. In this circumstance, you
do not need to cut off the power supply, leave the fan to lower the temperature.
Generally, it will recover within 5 or 10 minutes.

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Working Environment
1. Under comparative dry environment, the moisture≤80%
2. The environment temperature should be between -10°C and +40°C
3. Avoid working in the sun or rain
4. Avoid working in the environment where there is much dust or corrosive gas.
Safety Tips
1) Good air circulation
This machine is small in size, and big in current output so the natural air circulation
cannot satisfy its need, and we add special fans for cooling.
NOTE: make sure the two terminals and the vents are not blocked and covered, and
the machine should be placed 0.3m away from the surroundings; please always
improve the circulating condition, because it’s very important for the normal working of
the welding machine.
2) No over-load working
Over-loading is prohibited; otherwise the machine may stop suddenly during the
welding. Under this circumstance, it is not necessary to cut the power, allow the fan to
lower the temperature. Recovery of the machine will commence once the temperature
has fallen.
3) No over-voltage
For the power voltage range of the machine see the Technical Data table on page 5.
In the case of over voltage, the inner voltage will complement by itself, and guarantee
the welding current will not surpass the allowed value. Please be more careful if the
parts are damaged because of over-voltage.
4) Earth
Each machine has a screw for the earth connection, please choose a 10mm²cable to
connect the case of the machine to its earth to avoid breakdown caused by static
electricity or electricity-leaking.
5) Electric Shock
Do not touch the output terminal when working, or it may cause electric shock.

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MAINTENANCE
1) Clear the dust at regular intervals with clean and dry compressed air; if the working
conditions have heavy smoke and pollution, the welding machine should be cleaned once a
month.
2) Avoid water and rain. In the event of the welder getting wet check the connection
between the case and the connection. Only when this is clear can you recommence the
welding.
3) If the machine is not going to be used for a long time, put it into the original packing in dry
conditions.
TROUBLESHOOTING
If you have any problems in setting up or operating, please first consult this manual.
If you are still having difficulties after reading this manual, please contact Inverter Fusion
Ltd direct.

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PRODUCT WARRANTY
September 2010
This limited warranty supersedes all previous Inverter Fusion Limited warranties and
applies to sales of Inverter Fusion Limited equipment in the UK.
Warranty
Subject to the following terms and conditions, Inverter Fusion Limited warrants to the
original retail purchaser that new Inverter Fusion Limited equipment sold in the UK is free of
defects in material and workmanship at the time of its despatch from Inverter Fusion
Limited for the warranty period advertised for the product at the time of sale.
Within the warranty period as listed, Inverter Fusion Limited will repair or replace any
warranted parts or components that fail due to such defects in material or workmanship,
provided the warranty has been registered at the time of purchase.
Inverter Fusion Product Warranty shall not apply to:
• Consumable items and accessories supplied by Inverter Fusion Limited but
manufactured by others. These items will be covered by the manufacturer’s warranty,
if any.
• Electrodes, contactors and relays.
• Equipment that has been modified or repaired in any way
• Equipment that has been improperly installed, misused, improperly operated, or
used in a manner that does not comply with an industry standard.
• Equipment that has been used for a purpose outside the specifications for that
equipment
• Equipment that has not been maintained in a condition that would make it suitable
for use.
• Equipment which has been used in conjunction with parts or consumables which
affect the equipment operation which are deemed by Inverter Fusion Ltd to be of
inferior quality or no fit for that purpose
In the event of a valid warranty claim being made on any Inverter Fusion Limited product,
the exclusive remedies shall be, at the discretion of Inverter Fusion Limited, either the
repair or replacement of the product
To the extent permitted by Law, the remedies provided herein are the sole and exclusive
remedies.
Inverter Fusion Limited liability under this warranty shall not exceed the cost of correcting

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the defect. In no event shall Inverter Fusion Limited be liable for direct, indirect, special,
incidental or consequential damages (including loss of profit), whether based on contract,
tort, or any other legal theory.
Any express warranty not provided herein and any implied warranty, guarantee, or
representation as to the performance, and any remedy for breach of contract, tort or any
other legal theory which, but for this provision, might arise by implication, operation of Law,
Custom of Trade, or course of dealing, including and implied warranty or merchantability for
a particular purpose, with respect to any and all equipment furnished by Inverter Fusion
Limited, is excluded and disclaimed by Inverter Fusion Limited.
Warranty Registration
In order for any warranty to be valid, the Warranty Registration Card enclosed must be
completed and returned at the time of purchase in order to register the warranty with
Inverter Fusion Limited. Alternatively the warranty may be registered via the company’s
website www.inverterfusion.com
Warranty Claims Procedure
In the event of a claim, the claimant must first contact Inverter Fusion Limited for a warranty
claim authorization number. Following this, the Warranty Claim form, as printed on the
reverse side of this page should be completed with all the details as requested and
forwarded to Inverter Fusion Limited at the address below along with the faulty product and
a copy of the original purchase receipt. The claimant will be responsible for all carriage,
insurance and transportation costs in returning the product to Inverter Fusion Limited.
Upon receipt and inspection of the product, if valid the product will be repaired or replaced
at the discretion of Inverter Fusion Limited. In the event of a repair being required that is not
considered to be a warranty issue, the claimant will be contacted for his further instruction.
Following the completion of any authorized warranty claim work, the product will be
returned to the original claimant at the cost of Inverter Fusion Limited. (UK Customers Only)
Failure to comply with the above procedure could invalidate or delay the completion of any
warranty work.
Improper use, abuse or any attempt to repair the product by an unauthorized third party will
invalidate any warranty claim.
Inverter Fusion Ltd
Heathpark Way
Heathpark Industrial Estate
Honiton
Devon EX14 1BB