USER MANUAL
ARC 250G/315G/400G
USER MANUAL
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YF-10G A/0
CONTENTS
Safety warning
2
Machine description
3
Technical parameters table
4
Installation instruction
5
Operation instruction
7
Panel function instruction
8
Notes or preventive measures
10
Questions to be run into during welding
11
Maintenance
12
Troubleshooting and fault finding
13
USER MANUAL
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YF-10G A/0
SAFETY WARNING
On the process of welding or cutting, there will be possibility of injury, so please take protection
into consideration during operation. For more details please review the Operator Safety Guide,
which complies with the preventive requirements of the manufacturer.
Electric shock——May lead to death！！

Set the earth fitting according to applying standard.

Forbidden to touch the bare electric parts and electrode with uncovered skin, wet gloves or clothes.

Make sure you are insulated from the ground and the workshop.

Make sure you are in safe position.
Gases and fumes——May be harmful to health!

Keep your head out of the gases and fumes.

When arc welding, ventilators or air extractors should be used to avoid breathing gases.
Arc rays——Harmful to your eyes, burn your skin.

Wear suitable protective mask, light filter and protective garment to protect eyes and body.

Prepare suitable protective mask or curtain to protect looker-on.
Fire

Welding spark may cause fire, make sure there is no tinder stuff around the welding area.
Noise——Excessive noises will be harmful to hearing.

Use ear protector or others means to protect ear.

Warn looker-on that noise is harmful to hearing.
Malfunction——When trouble happens, contact with authorized professionals.

If trouble happens during installation and operation, please follow this manual instruction to check up.

If you fail to fully understand the manual, or fail to solve the problem with the instruction, you should contact the
suppliers or the service center for professional help.
WARNING!
Creepage protecting switch should be added when using the machine!!!
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YF-10G A/0
MACHINE DESCRIPTION
The welding machine is a rectifier adopting the most advanced inverter technology.
The development of inverter welding equipment profits from the development of the inverter power supply theory and
components. The inverter welding power source utilizes high-power component single tube IGBT to transfer 50/60Hz
frequency up to 15KHz, then reduce the voltage and commutate, and output high-power voltage via PWM technology.
Because of the great reduce of the main transformer’s weight and volume; the efficiency increases by 30%. The
appearance of inverter welding equipment is considered to be a revolution for welding industry.
The welding power source can offer stronger, more concentrated and more stable arc. When stick and work piece get
short, its response will be quicker. It means that it is easier to design into welding machine with different dynamic
characteristics, and it even can be adjusted for specialty to make arc softer or harder.
The welding machine has the following characteristics: effective, power saving, compact, stable arc, good welding pool,
high no-load voltage, and good capacity of force compensation and multi-use. It can weld stainless steel, alloy steel,
carbon steel, copper and other color metal. It can apply to electrode of different specifications and materials, including
acidity, alkalinity, and fiber. It can apply in high altitude, the open air and inside and outside decoration. Compared with
the same products of home and abroad, it is compact in volume, light in weight, easy to install and operate.
The welding machine is most suitable for welding tube, boiler, vacuum pressure vessel or the higher quality for welding,
which can gain perfect welding quality. In addition, this series machine have enough no-load voltage and the ability of
output, ideal for long cable welding.
Thanks for purchasing our product and hope for your precious advice. We will be dedicated to produce the best products
and offer the best service.
WARNING！
The machine is mainly used in industry. It will produce radio wave, so the worker should make fully
preparation for protection.
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YF-10G A/0
TECHNICAL PARAMETERS TABLE
Model
Parameters
Power voltage(V)
ARC 250G
ARC315G
ARC 400G
Three Phase
Three Phase
Three Phase
AC 400V±15%
AC 400V±15%
AC 400V±15%
±
Frequency (Hz)
50/60
50/60
50/60
Rated input current (A)
14.4
19.7
27.6
No-load voltage(V)
66
69
68
Output current(A)
20-250
20-315
40-400
Rated output voltage(V)
20,8-30
20,8-32.6
21,6-36
Duty cycle (%) 0-100
60
60
60
Efficiency
85
85
85
Power factor
0.93
0.93
0.93
Insulation grade
F
F
F
Housing protection
IP21
IP21
IP21
Weight (Kg)
17.5
20
22
Dimensions (mm)
455×202×372
grade
USER MANUAL
485×234×425
4
515×262×468
YF-10G A/0
INSTALLATION INSTRUCTION
The machine is equipment with power voltage compensation equipment. When power voltage moves between±10% of
rated voltage, it still can work normally.
When use long cable, in order to prevent voltage form going down, bigger section cable is suggested. If cable is too long,
it may affect the performance of the power system. So we suggest you to use configured length.
1.
Make sure intake of the machine not blocked or covered, lest cooling system could not work.
2.
Use inducting cable whose section is not less than 6 mm² to connect the housing to the ground. The way is from the
ground-connecting screw at the back to the earth device.
3.
Correctly connect the arc torch or holder according to the sketch. Make sure the cable, holder and fastening plug
have been connected with the ground. Put the fastening plug into the fastening socket at the “-”polarity and fasten it clockwise.
4.
Put the fastening plug of the cable to fastening socket of “+” polarity at the front panel, fasten it clockwise, and the
earth clamp at the other terminal clamps the work piece.
5.
Please pay attention to the connecting polarity, DC welding machine has two connecting ways: positive connection
and negative connection. Positive connection: holder connects with “-” polarity, while work piece with the “+”polarity.
Negative connection: work piece with the “-”polarity, holder with the “+” polarity. Choose suitable way according to
working demands. If unsuitable choice, it will cause unstable arc, more spatters and conglutination. If such problems
occur, please change the polarity of the fastening plug.
6.
According to input voltage grade, connect power cable with power supply box of relevant voltage grade. Make sure
there is no mistake and make sure the voltage difference among permission range. After the above job, installment
is finished and welding is available.
If distance of work piece and machine is too far (500-100m), and the cables (torch cable and
earth cable) are too long, please choose cable of bigger section to minimize the reduction
of the voltage.
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YF-10G A/0
Installation instruction of ARC 250G:
Power Supply
(3phase ~ 400V)
Connected to
the ground
Earth Clamp
Workpiece
Electrode Holder
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YF-10G A/0
OPERATION INSTRUCTION
1.
Open the power switch, screen will show set current volume and ventilator is beginning to revolve.
2.
Adjust knobs of welding current and arc-striking push, make welding function complies with demands.
3.
Generally, welding current is adequate to welding electrode according with as following:
Specification
Current
4.
φ2.5
φ3.2
70-100A
110-140A
φ4.0
170-220A
φ5.0
230-280A
Knob of arc-striking drive is use to adjust welding function, specially in low current arrange, that is cooperated with
knob of welding current adjustment, they may adjust current of arc striking and be out of control of knob of welding
current adjustment .So machine can grain powerful energy and push current can achieve effect that may.
5.
If the anti-shock device is installed in the machine. When the switch of back panel is put "ON" position, the VRD
indicator is lit, and when the switch is put "OFF" position, the VRD indicator is off, then the no-load voltage is 60-70V.
Switch of VRD is put inside the machine, with the "on" condition. the no-load voltage changes to be less than 15V,
which is safe for people.
6.
If welding machine has been coordinated remote control device:
1)
Make sure the switch position of remote control device before operation .If switch is on “OFF” Position that is
out of remote control. Switch is on “ON” position that is using remote control device.
2)
Insert plug of remote control in socket of remote control correctly and tighten firmly in order to prevent poor
contact.
3)
If remote control device is not be used, make sure the switch is on “OFF” position, or welding current will not be
adjusted on panel.
7.
Hot initiation: Heavy current, perfect effect, striking easier.
WARNING!
Before connecting operation please make sure all the power is turned off. The right order is
to connect the welding cable and ground cable to the machine first, and make sure they are
firmly connected and then put the power plug to the power source.
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YF-10G A/0
PANEL FUNCTION INSTRUCTION
Front Panel Instruction of ARC 250G:
1
VRD switch
2
VRD indicator led
3
Abnormal indicator led
4
Current meter
5
Hot start adjustment knob
6
ARC force adjustment knob
7
Current selection knob
8
Positive output terminal
9
Negative output terminal
Front Panel Instruction of ARC 315G:
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1
Current meter
2
ARC force adjustment knob
3
Hot start adjustment knob
4
VRD indicator led
5
Abnormal indicator led
6
VRD switch
7
Remote control switch
8
Current selection knob
9
Positive output terminal
10
Remote control socket
11
Negative output terminal
YF-10G A/0
Front Panel Instruction of ARC 400G:
1
Remote control switch
2
VRD switch
3
VRD indicator led
4
Abnormal indicator led
5
Current meter
6
Hot start adjustment knob
7
ARC force adjustment knob
8
Current selection knob
9
Positive output terminal
10
Remote control socket
11
Negative output terminal
The panel picture above is for reference only. If any difference with the real machine, please follow with the real machine.
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YF-10G A/0
NOTES OR PREVENTIVE MEASURES
1. Environment
1） The machine can perform in environment where conditions are dry with a dampness level of max 90%.
2）
Ambient temperature is between -10 to 40 degrees centigrade.
3）
Avoid welding in sunshine or drippings. Do not let water enter the gas.
4）
Avoid welding in dust area or the environment with corrosive gas.
5）
Avoid gas welding in the environment with strong airflow.
2. Safety norms
Our welding machine has installed protection circuit of over voltage, over current and over heat. When voltage,
output current and temperature of machine are exceeding the rated standard, welding machine will stop working
automatically. Because this will be damage to welding machine, user must pay attention to following.
1） The working area is adequately ventilated！
Our welding machine is powerful machine, when it is being operated, it generated high currents, and natural
wind cannot satisfy with machine cool demands. So there is a fan inside the machine for its cooling demands.
Make sure the intake is not in block or covered, There should be 0.3 meter distance from welding machine to
objects of environment. User should make sure the working area is adequately ventilated. It is important for the
performance and the longevity of the machine.
2） Do not over load！
The operator should remember to watch the max duty current (Response to the selected duty cycle) Welding
current should not exceed max duty cycle current. Over-load current will damage and burn up the machine.
3） No over voltage！
Power voltage can be found in diagram of main technical data. Automatic compensation circuit of voltage will
assure that welding current keeps is in allowable range. If power voltage is exceeding allowable range limits, it
can damage the components of machine. The operator should understand this situation and take preventive
measures.
4） There is a grounding screw behind welding machine, with a grounding marker on it. Before operation, welding
crust must be grounded reliably with cable which section is over 6 square millimeter, in order to prevent from
static electricity, and accidents because of electricity leaking.
5） If welding time is exceeding duty cycle limited, welding machine will stop working for protection. Because
machine is overheated, temperature control switch is on “ON’’ position and the indicator light is red. In this
situation, you don’t have to pull the plug, let the fan cool the machine. When the indicator light is off, and the
temperature goes down to the standard range, it can weld again.
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YF-10G A/0
QUESTIONS TO BE RUN INTO DURING WELDING
Fittings, welding materials, environment factor, supply powers maybe have something to do with welding. User must try
to improve welding environment.
A. Arc-striking is difficult and easy to pause:
1. Make sure quality of tungsten electrode is high.
2. If the electrode is not dried, it will cause unstable arc, welding defect increases and the quality is down.
3. If use extra-long cable, the output voltage will decrease, so please shorten the cable.
B. Output current is not to rated value:
When power voltage departs from the rated value, it will make the output current not matched with rated value; when
voltage is lower than rated value, the max output may lower than rated value.
C. Current is not stabilizing when machine is being operated:
This may be caused by the following factors:
1. Electric wire net voltage has been changed.
2. There is harmful interference from electric wire net or other equipment.
D. Too much spatter during MMA welding:
1. Maybe current is too heavy while welding rod diameter is too small:
2. Output terminal polarity connection is wrong. The positive connection should be applied at the normal technique, that
is to say, welding rod connects with the negative polarity while the work piece with the positive polarity. So please
change the polarity.
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YF-10G A/0
MAINTENANCE
1. Remove dust by dry and clean compressed air regularly, if welding machine is operating in environment where is
polluted with smokes and pollution air, the machine needs to be cleaned once a month.
2. Pressure of compressed air must be within the reasonable range in order to prevent damaging to small components
of inner-machine.
3. Check internal circuit of welding machine regularly and make sure the circuit connections are connected correctly
and tightly (especially plug-in connector and components). If scale and rust are found, please clean it, and connect
again tightly.
4. Prevent water and steam from entering into the machine. If that happens, please blow it dry and check insulation of
machine.
5. If welding machine will not be used for long time, it must be put into the packing box and stored in dry and clean
environment.
WARNING！
Connected welding machine to dynamotor directly will damage machine. The heavy voltage
pulse which is produced by dynamotor will burn out machine when machine connected
to dynamotor, only can use asynchronous dynamotor whose frequency and voltage both are
steady. Because of connecting welding machine to dynamotor directly lead to damage
and malfunction, which is not in guarantee.
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YF-10G A/0
TROUBLESHOOTING AND FAULT FINDING
Notes: The following operations must be performed by qualified electricians with valid certifications. Before
maintenance,please contact with us for professional suggestion.
Fault symptom and solution of ARC 250G//315G/400G:
Fault symptom
Meter doesn’t display, fan doesn’t
work, no welding output.
Solution
1. Make sure power switch is off.
2. Make sure the power source connecting to input cable is working alright.
3. Make sure the input voltage is 3 phase.
Meter is normal, fan is working,
no welding output.
1. Check if all kinds of components of machine are poor contact.
2. Check if connector of output terminal is broken or damaged.
3. Check if the control board is damaged (contact with the supplier or
manufacturer).
Abnormal indicator is on, fan is
1. IGBT is damaged.
working, meter is normal
2. Rectifier of quick recovery is damaged.
3. Control board is broken.
4. The feedback circuit is in fault. Please contact with the supplier or manufacturer.
Too much spatter during MMA
Output terminal polarity connection is wrong. So please change the polarity.
welding
Erratic welding output current or
1. The potentiometer is damaged.
out of control of potentiometer.
2. All kinds of connectors are poor contact, especially plugs. Check them.
1. Power switch is broken.
Power switch doesn’t work
2. Three phase rectifier bridge is broken, replace it.
3. Check if there is any short circuit of inner-machine.
If the welding machine doesn’t work after the above examination and repair, please contact the local dealer or after-sales
service department of our company.
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YF-10G A/0