Operator’s Manual
Inverter DC MMA Welder
MMA-160FI MMA-250FI
IMPORTANT: This operational manual kindly show you how to install, dedug,
operate and maintain the welder. Read this instructions carefully and you will
understand how to use it to reduce the risk of error operation.
Warning!
This machine should be operated and maintained by full-time staffs or
professionals. You are not allowed to operate and repair it unless read this manual
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CONTENT
1 Brief Introduction ----------------------------------------------------------------------------------------- 3
2 Safety --------------------------------------------------------------------------------------------------------- 3
2.1 Self-Protection --------------------------------------------------------------------------------------------- 3
2.2 Cautions ---------------------------------------------------------------------------------------------------- 4
2.3 Safety Precaution for Installation and Location ------------------------------------------------------ 4
2.4 Security Check -------------------------------------------------------------------------------------------- 5
3 Technical Description ------------------------------------------------------------------------------------- 5
3.1 Environment ----------------------------------------------------------------------------------------------- 5
3.2 Input Power ------------------------------------------------------------------------------------------------ 6
3.3 Equipment Principle -------------------------------------------------------------------------------------- 6
3.4 Equipment Structure -------------------------------------------------------------------------------------- 6
3.5 Guide for Marking Models ------------------------------------------------------------------------------ 7
3.6 Parameter --------------------------------------------------------------------------------------------------- 7
3.7 Standard ---------------------------------------------------------------------------------------------------- 8
3.8 Symbol Chart ---------------------------------------------------------------------------------------------- 8
4 Installation -------------------------------------------------------------------------------------------------- 8
4.1 Connection ------------------------------------------------------------------------------------------------- 8
4.2 Power Source Connection ------------------------------------------------------------------------------ 9
4.3 Electrode Polarity ---------------------------------------------------------------------------------------- 9
4.4 Workpiece Connection ---------------------------------------------------------------------------------- 10
5 Operation Instruction ----------------------------------------------------------------------------------- 10
5.1 Procedure ------------------------------------------------------------------------------------------------- 11
5.2 Electrode Replacement --------------------------------------------------------------------------------- 11
5.3 Slag Removal -------------------------------------------------------------------------------------------- 12
5.4 Maintenance ---------------------------------------------------------------------------------------------- 12
6 Basic Trouble Shooting ---------------------------------------------------------------------------------- 13
7 Parts List --------------------------------------------------------------------------------------------------- 14
8 Interconnection Diagram ------------------------------------------------------------------------------- 15
9 Accessories ------------------------------------------------------------------------------------------------- 15
10 Transportation and Storage -------------------------------------------------------------------------- 16
11 Quality Warranty --------------------------------------------------------------------------------------- 16
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1 Brief Introduction
INARC welder uses imported IGBT as main electric components. It is supplemented by a
specially developed main PCB board. In addition, the uniform regulation of welding
current has been designed to guarantee the arc reach good welding process adaptability.
What’s more, its perfect dynamic protection features ensure that it is safe and reliable
when use. It is ideal for using low carbon steel, alloy steel etc.
INARC Features:
60% high duty cycle.
Lower cost operation, more portable, more compact, superior output.
Excellent arc properties and solution droplet transfer.
With the protections of over-heating, over-current.
Digital display function.
Plastic handle makes it beautiful and easy to carry.
Convenient quick connection for the output makes it quick, safe, simple and stable.
NOTES: The above description may be modified without prior notice such as
omissions, unclear statements about this welder.
2 Safety
2.1 Self-Protection
* The user must comply with occupational safety and health rules and wear appropriate
labor protective equipment. Try to avoid injury on eye and skin.
* It is safe to cover your head with face mask while welding, only do the observation on
the arc through the window of the mask.
* Don’t expose any part of the body at the same time to the welding positive and negative
output terminals without insulated protection.
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2.2 Cautions
* INARC Inverter DC Arc welder is a kind of electronic product which makes its
components more easily damaged. While replacing or modulating, the strength should
not be too much in order to avoid causing damage to the device.
* Check the connection to see if it is correct or reliable each time before working.
Besides, ensure the grounding outlet device correct.
* While using, as smoke is harmful to human’s health, the operation must be carried out
in the ventilation and exhaust facilities.
* Prohibit non-professionals to change or replace the welder.
* Since the welder owns strong electromagnetic and radio frequencies, the people with
cardiac pacemakers affected by the interference electromagnetic, electrical frequency are
not allowed to stay nearby.
* When it works, please pay attention to its rated duty cycle. Do not overload.
2.3 Safety Precaution for Installation and Location
* In some areas, where something may fall from the sky, personal safety precaution
should be taken.
* In some areas around construction site, something like the dust, acid, corrosive gases or
other substance in the air cannot exceed the standard value except those generated while
welding.
* It is should be equipped in the open air where there is no direct sunlight, anti-rain,
temperature range from -10℃ to +40℃ and low humidity place.
* 50cm space is needed to ensure good ventilation.
* No metal impurities are tolerant inside the welder.
* In some areas, there is no severe vibration.
* Make sure no interference will be caused to the surrounding in the welding area.
* Whether the power supply capacity is sufficient to allow the welder to work normally
or not. And a safety protection device should be equipped in the input power.
* Prevent it from dumping if the welder is put in the place of over 10°incline.
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2.4 Security Check
The following items must be checked up by the operator each time before access to the
power source.
* Make sure the power socket is reliably grounded.
* Make sure the output terminals are well connected without short circuit.
* Make sure output and input cables are perfect with no exposure.
The welding machine must be inspected by professionals at regular time (not exceed 6
months). The contents as follow:
* Whether the electronic components are loosed or not and dust removal must be
conducted.
* Whether the panel mounted on the device should be able to guarantee the normal
implementation of the machine.
* Whether the input cables are damaged or not. If yes, safe handling must done.
Warning!
Disconnect the power source before servicing it. Contact with the manufacturer or
agent immediately to acquire the service and support skills when users do not have
the ability to repair it.
3 Technical Description
3.1 Environment
* Working temperature: -10℃~40℃.
* Transportation and storage: -25℃~55℃.
* Relative air humidity: 40℃≤50%; 20℃≤90%.
* The dust, acids, corrosive gases and substance in the ambient air must be lower normal
level except those from welding process.
* Altitude must be less than 1km.
* Keep good ventilation at a distance of 50cm around.
* Put it in somewhere the speed of wind not less than 1m/s.
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