Duralloy 140MMA MINI User manual

duralloy.net.au
140MMA MINI
OPERATION MANUAL
Part No : DA140M

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CONTENTS
1. SAFETY ........................................................................................................... 3
2. Summary .................................................................................................... 4
3. Electrical principle drawing ......................................................................... 4
4. Parameters ................................................................................................ 5
5. Operation control and connectors .............................................................. 6
6. Installation & Adjustment ............................................................................ 6
6.1 Installation ........................................................................................ 6
6.2 Operation .......................................................................................... 6
6.3 Welding Table .......................................................................................... 7
7. Operation Notices ...................................................................................... 8
7.1 Installation ........................................................................................... 8
7.2 Safety ................................................................................................... 7
8. Maintenance .............................................................................................. 9
9. Troubleshooting & Service ....................................................................... 10

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1. Safety
Welding may damage your body or others, so please take protection measure in
operation.
Only ones who are trained professionally can install, operate, maintain and
repair the equipment.
Do not maintain and repair the machine when the machine is connected with
power.
Electric shock can kill.
Never touch electrical parts.
Wear dry, hole-free gloves and clothes to insulate yourself.
Insulate yourself from work and ground using dry insulation. Make certain the
insulation is large enough to cover your full area of physical contact with work
and ground.
Ensure to install the equipment correctly and ground the work or metal to be
welded to a good electrical (earth) ground according the operation manual.
Ensure to operate the equipment in safe position.
Fumes and gasses can be dangerous!
Welding may produce fumes and gases hazardous to health. Avoid breathing
these fumes and gases. When welding, keep your head out the fume.
Using enough ventilation and/or exhaust at the arc to keep fumes and gases
away from the breathing zone.
Welding sparks can cause fire or explosion.
Remove fire hazards from the welding area. If this is not possible, cover them
to prevent the welding sparks from starting a fire. Remember that welding
sparks and not materials from welding can easily go through small cracks and
openings to adjacent areas.
Do not weld enclosed tanks or containers.
Prohibit to use welder to unfrozen.
Have a fire extinguisher readily available.
Hot parts can lead to burn.
Do not touch the hot parts.
Please use the torch after cooling or use the welding blow lamp.
The people with heart-pacemaker should be away from the welding arc.
Rotating parts may be dangerous.
Far away from rotating parts. (Like fan)
Keep the parts of machine in the safe position.

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2. Summary
140MMA MINI welder is a MMA arc welder which adopts the insulated gate
bipolar transistor (IGBT) power module.
It can change work frequency to medium frequency so as to replace the
traditional large transformer with the cabinet medium frequency transformer.
Thus, it is characterized with portable, small size, light weight, low consumption
and noise etc.
140mini has excellent performance: constant current output makes welding arc
more stable; fast dynamic response speed reduces the impact form the arc
length fluctuation to the current.
There are also some automatic protection functions for under, over current, over
heat, etc. inside the welders, when the problems listed before occurred, the
alarm on the front panel is lit and at the same time the output current will be cut
off. It can self-protect and prolong the using life and greatly improved the
reliability of the welders.
140MMA MINI is east to strike an arc, with little spatter and good weld bead.
140MMA MINI is designed for DIY, architecture.

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3. Electrical principle drawing
4. Parameters
Model
DA140M
Power Supply Voltage (V)
1~240±10%
Frequency(HZ)
50
Rated Input Power(KW)
5.8
Rate Input Current(A)
10/25A
Duty Cycle(40 ℃ 10min)
15% 140A
60%70A
100% 54A
No Load Voltage(V)
65
Welding Current Range(A)
10~140
Efficiency (%)
≥85%
Power Factor
0.76
Net Weight(Kg)
2
Protection Class
IP21S
Insulation Class
H
Dimensions(mm)
210*100*137
Electrode Diameter
φ1.6~φ3.2
Electrode Type
Rutile & SS Electrodes
*EN60974-1
Circuit Schematic of INARC Welder
(Figures for reference are subject to change without notice.)

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5. Operation control and connectors.
(1) Welding current adjustment knob: Turn this knob to adjust the output current.
(2) Alarm light: alarm indicator, lights that occurred over voltage, over current,
or overheating inside the machine, is protected.
(3) Current digital display
(4) Power switch: Turn Machine on/off.
(5) Power Access client: Primary power Lead.

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6. Installation & Adjustment
Note: Please follow steps in strictly accordance with installation!
Turn Off power at Mains power point!
The equipment protection level is IP21s. Do not use it in the rain!
6.1 Installation
6.1.1 Connect machine to 10 amp 240v power outlet.
6.1.2 Ensure Power Point is in good condition.
6.1.3 With a multi meter measure the input voltage is within the fluctuation range.
6.1.4 Ensure Ground Cable is fitted securely to the front panel.
6.1.5 Ensure Electrode lead is fitted securely to front panel. (+)
6.1.6 Ensure Earth is well attached and grounded to the job. (-)
6.2 Operation
1. To operate the machine, turn the power switch, so that the power switch is
in the “ON” position, then the power indicator light & fan comes on, the device
is ready to use.
2. Please note, choose correct polarity selection based on the electrodes to be used.
3. Ensure Welding leads are kept in good condition, damaged leads or earth
clamp can affect weld performance.
6.3 Welding Table
Note: The following table applies to low-carbon steel, other materials, please refer to
related information.
Electrode diameter (mm)
Recommended
welding current(A)
Recommended welding
voltage(V)
1.0
20~60
20.8~22.4
1.6
44~84
21.76~23.36
2.0
60~100
22.4~24
2.5
80~120
23.2~24.8
3.2
108~148
23.32~24.92
4.0
160~200
26.4~28
5.0
180~260
27.2~30.4

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7. Operation Notices
7.1 Installation
1. Welding environmental temperature should be between -10
℃
to 40
℃
.
2. Welding should be done in relatively dry environments, with air humidity of not
more than 90%.
3. Avoid areas containing dust or corrosive gas whilst welding.
4. Avoid sunlight or rain, do not let water or rain infiltrate the welding machine.
7.2 Safety
When the Welding machine has encountered over-voltage, over current and over
temperature protection circuit, when the primary voltage, output current and the internal
temperature exceeds the set temperature, the welding machine will automatically stop
working; so you need to note the following:
(1) To ensure good ventilation!
The machine is equipped with internal cooling fan ensure that there is adequate air flow
around the machine.
(2) Do not exceed duty Cycle!
Operators should ensure to use the machine within its normal range of operation,
continually putting the machine in overload will reduce life of the equipment in the longer
term.
(3) Ensure machine is connected to correct voltage!
The machine should only be connected to 15Amp 240v Power supply

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8. Maintenance
The following operations require the operator has sufficient electrical expertise and
comprehensive Safety knowledge, precaution should be used when opening the
machine case as electrical parts are LIVE!!
(1) Periodic inspection of welding internal circuit connections, make sure
connections are correct and have good connection, (especially the joints or
components). If any rust clean off rust layer and the oxide film, reconnect, and
tighten.
(2) Do not allow hands, hair and tools near live components inside the machine,
such as: fans, so as not to hurt or cause damage to the person or machine.
(3) Regularly with a clean dry compressed air to clean dust from the machine,
compressed air pressure should be at reasonable levels in order to avoid
damage to the welding components inside.
(4) Avoid water or water vapor entering into the welding machine, if there is such a
case, the internal welding machine should be dried. & tested by an authorized
repairer prior to use
(5) Regular inspections for damage of the welding cable, if any, replace the cable.
(6) If not using welding machine, welding machine should be back in the box and
kept in a dry environment.

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9. Troubleshooting & Service
The following operations require the operator has sufficient electrical expertise and
comprehensive Safety knowledge. Proper precautions should be adhered to if
opening the machine case as parts are electrically live!
Common Faults and repair method:
Symptom
Solution
Power indicator does not light, fan does not
turn, no welding output.
1. Make sure the power switch is turned on.
2. Confirm that the power input cable are
connected with electricity.
Symptom
Solution
Inconsistent weld output
1. The current potential is damaged, should
be replaced.
2. faulty connections, such as lead plugs to
be checked.
Power indicator light on & fan operating with
no welding output.
1. Check all connections inside the
machine.
circuit output connections is faulty.
2. the alarm indicator light
(1)that access to protected status
because of overheating, in which case,
To ma i nt ai n po wer, so th at t he
temperature dropped to the machine fan
Reasonable temperature, until light goes
out, you can continue working;
(2)Check the thermal switch is damaged,
such damage, to be Replaced
Earth Clamp overheating
Welding clamp rated current is too small, the
replacement of larger size welding clamp.
Manual welding spatter
Output polarity is incorrect, reverse polarity

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10. Warranty Information
Duralloy Welding Equipment.
1 year Warranty*
Duralloy Industrial Supply warrants the original retail purchaser that the Duralloy Welding and Cutting
machines purchased will be free from defects in materials and workmanship for a period of 1 years*
from the date of purchase by the customer. If a defect in material or workmanship becomes evident
during this period, Duralloy Industrial Supply will at its option;
• Repair the product (or pay for the repair of the product)
• Replace the product
In case of warranty claim the product should be returned to the original place of purchase, with proof
of purchase.
Any handling and transport costs (or other expenses) incurred in claiming warranty are not covered
by this warranty. The warranty schedule is:
• Duralloy Power source only* - 1 year
• Duralloy Regulator - 3 months
• MIG Torches - 3 months
• TIG Torches - 3 months
• Plasma Torches - 3 months
• Ancillary Equipment - 3 months
The Obligation of Duralloy Industrial Supply under this warranty is limited to the circumstance set out
above and is subject to:
• The customer being able to provide proof of purchase of the relevant equipment.
• A defect in either material or workmanship.
• The customer returning the product to Duralloy Industrial supply or an authorized repair agent.
• The product not having been altered or tampered with.
• The product not having been used outside the normal operating parameters of this equipment.
• The product to be in good condition and not damaged which may cause a fault
All goods come with a guarantee that cannot be excluded under the Australian Consumer laws. You
as a consumer are entitled to a replacement or a refund for a major failure .You are also entitled to
have the goods repaired or replaced if the products fail to be of acceptable quality:
This Warranty Provided by:
Duralloy Industrial Supply - (ABN - 81 831 839 268)
2 Hollylea Road Leumeah NSW 2560
1300 369 456