HUAYUAN LG-125HA User manual

LG-125HA
PLASMA CUTTING MACHINE
MANUAL
INSTRUCTION
(PLEASE READ IT CAREFULLY BEFORE OPERATION)

Safety Depends on You
HUAYUAN arc welding and cutting equipments are designed and built with ample safety consideration. However,
proper installing and operating can ensure your safety.
DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT CASUALLY WITHOUT READING THIS MANUAL
THROUGHOUT.
Special Notes (Very Important):
1. Pay attention to avoiding the machine falling down when it is placed on the gradient ground.
2. It is forbidden to unfreeze the pipeline by the cutter.
3. The shield rank of this series of cutter is IP21S, so working in rain is not suitable.
4．The cutter has external static characteristic with rated duty cycle 100%, which means the machine can work
continuously at the rated cutting current. The machine has the function of thermal protection. When the internal
temperature exceeds a set temperature, thermal protection moves on and the abnormity indicator lamp on the
panel turns ON, then there is no output in cutter. The machine can become normal and work only after the
internal temperature drops down and the abnormity indicator lamp on the panel turns OFF.
Purchase Date：
Serial Number：
Machine Model：
Purchase Place：

Cautions
Arc and arc rays can hurt.
All performing welding workers ought to have health qualification from the authority organization to prevent you and
others from arc radiation and burn. It should be prevented for children to enter into dangerous area as well.
Be careful reading the following important items and the welder safety byelaw from the authority organization. Be sure
that qualified professionals perform all installation, maintenances and repair procedures.
1 Electric shock: The welding circuits are not insulated when welding. If you touch the two output
electrodes of the machine with your bare skin at the same time, it will lead to electric shock,
sometimes even fatal dangers. Users need to follow the items below to avoid electric shocks:
If possible, lay some insulating materials, which are dry and large enough, in your working field. Otherwise,
use the automatic or semiautomatic welding machine, DC welding machine as possible as you can.
Components in the automatic and semiautomatic welding machine such as the welding wire reel, feed
wheel, contact tip and welding head are all electric components. .
Always be sure the machine has been connected perfectly to the work piece with the work cables and
should be as close as possible to the working area.
The work piece should be grounded perfectly.
Make sure that the insulating material of the electrode holder, the grounding clamp, the welding cable and
the welding head are not affected by damp, mildewed or spoilt, and be replaced momentarily.
Never dip the electrode in water for cooling.
Never touch electric components of two welding machines at the same time, because this voltage is
supposed to be two times of welding voltage while the grounding mode is not clear.
While working high above the ground or other places having the risk of falling, please be sure to wear safety
belt to avoid losing balance caused by electric shock.
2 Arc: Use an arc welding mask to protect your eyes and skin from sparks and the rays of the arc, pay
special attention to the filter glass, which must be conformable to the national standard.
Use clothing made from durable flame-resistant material or sailcloth to protect your skin
from hurting by the arc rays.
Remind other nearby personnel before working lest arc rays hurt them by accident.
3 Fumes and Gases: Welding may produce fumes and gases hazardous to health. Avoid breathing
these fumes and gases. While working in limited room, use enough ventilation and/or exhaust to keep
fumes and gases away from the breathing zone, or use the respirator. Do not weld at the same time
when using of degreasing, cleaning or spraying operations. The heat and rays of the arc can react with
these gases to form phosgene, a highly toxic gas,
Some protective gases used in welding might displace the oxygen in the air, and can lead to hurt or even
death.
Read and understand the manufacturer’s instructions for this equipment, and validate the health
certification of consumptive materials, make sure they are innocuous.
4 Spatter: Spatter can cause fire or explosion.
Remove fire hazards from the welding area. Remember that spatter from welding can
easily go through small cracks and touch fire hazards. Protect all kinds of lines going though
welding area, including hydraulic lines in the wild.
Where compressed gases are to be used in the field, special precautions should be used to prevent
explosion.
When welding stops, make certain that no live part is touching the work piece or the work stage. Accidental
contact can create a fire hazard.
Do not weld containers or lines, which are not proved to be innocuous.
It is very dangerous to heat, cut or weld tanks or containers at entry holes. Does not start work until the
proper steps have been taken to insure that there is no flammable or toxic gas.
Spatter might cause burn. Wear leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your
hair to prevent from burning by spatter. Wear the ear shield when performing sideways or face up welding.

Always wear safety glasses with side shields when being in a welding area.
The welding cables should be as close to the welding area as possible, and the short, the better. Avoid
welding cables going through the building framework, lifting chains, AC or DC cables of other welding machines
and appliances. The welding current is strong enough to damage them while having short circuit with them.
5 Cylinder: Damage of it might cause explosion.
Make sure that the gas in the storage cylinder is qualified for welding, and the
decompression flow-meter, the adapter and the pipe are all in good condition.
Make sure that the installation of cylinder is by the wall and bundled tightly by a chain.
Be sure to put the cylinder in the working space with no crash or shake, and far from welding area.
It is forbidden to touch cylinder with the welding clamp or the work cables.
Avoid facing the cylinder while installing the decompression flow-meter or the gasometer.
When not working, please tighten the valve.
6 Power: (For electrically powered welding and cutting equipment) Turn off input power before
installation, maintenances and repair, so that avoid accident.
HUAYUAN welding equipment is Ι class safeguard equipment; please install the equipment
in accordance with the manufacturer’s recommendations by specific persons.
Ground the equipment perfectly in accordance with the manufacturer’s recommendations.
7 Power:(For engine driven welding and cutting equipment)
Work in ventilated place or outdoors.
Do not add fuel near to fire or during engine starting or welding. When not working, add fuel
after engine is cooling down; otherwise, the evaporation of hot fuel would result in dangers. Do
not splash fuel out of the fuel tank, and do not start the engine until complete evaporation of the
outside fuel.
Make sure that all the safeguard equipment, machine cover and devices are all in a good
condition. Be sure that arms, clothes and all the tools do not touch all the moving and rotating
components including V belt, gear and fan etc.
Sometimes having to dismantle some parts of the device during maintenance, but must keep
safety awareness strongly every time.
Do not put your hand close to fans and do not move the brake handle while operating.
Please remove the connection between the engine and the welding equipment to avoid sudden starting
during maintenance.
When engine is hot, it is forbidden to open the airtight cover of the radiator water tank to avoid hurt by the
hot vapor.
8 Electromagnetic: Welding current going though any area can generate electromagnetic, as well as the
welding equipment itself.
Electromagnetic would affect cardiac pacemaker, the cardiac pacemaker users should
consult one’s doctor first.
The effect of electromagnetic to one’s health is not confirmed, so it might have some negative effect to
one’s health.
Welders may use following method to reduce the hazardous of electromagnetic:
a. Bundle the cable connected to the work piece and the welding cable together.
b. Do not enwind partially or entirely your body with the cable.
c. Do not place yourself between the welding cable and the ground (work piece) cable, if the welding cable is by your
left side, then the ground cable should be by your left side too.
d. The Welding cable and the ground cable are as short as possible.
e. Do not work near to the welding power source.
9 Lift Equipment: carton or wooden boxes package the welding machines supplied by HUAYUAN.
There is no lifting equipment in its wrapper. Users can move it to the prospective area by a fork-lift
truck, and then open the box.
If having rings, the machine can be transited using rings. While HUAYUAN Welding Machine
Manufacture reminds users, there is possible risk to damage the welding machine. It is better to
push the welding machine moving in use of its rollers unless special situations.

Be sure that the appurtenances are all removed off when lifting.
When lifting, make sure that there is no person below the welding machine, and remind
people passing by at any moment.
Do not move the hoist too fast.

10 Noise: HUAYUAN Welding Machine Manufacture reminds users: Noise beyond the limit (over 80
db) can cause injury to vision, heart and audition depending on oneself. Please consult local medical
institution. Use the equipment with doctor’s permission would help to keeping healthy.

CONTENT
1Summary.......................................................................................................................................................1
1.1 Model Instruction.........................................................................................................................................1
1.2 Features .......................................................................................................................................................1
1.3 Applications..................................................................................................................................................1
1.4 Symbol instructions......................................................................................................................................1
2Operation Environment.................................................................................................................................2
3Specifications and parameter........................................................................................................................2
3.1 Main technical parameters ..........................................................................................................................2
3.2 Plasma gas requirement ..............................................................................................................................3
3.3 Static External Characteristic Curve (Figure 1).............................................................................................3
4Panel and functions.......................................................................................................................................4
5System constitute..........................................................................................................................................5
5.1 Some Necessary Equipment Of Cutting........................................................................................................5
5.2 The cutting system connection please see the （ figure 3 ） ........................................................................5
6Installation and operation.............................................................................................................................6
6.1 Flitting and Lifting ........................................................................................................................................6
6.2 Installation and connection..........................................................................................................................6
6.3 Usage ...........................................................................................................................................................8
7Working principal ..........................................................................................................................................8
8Protection instruction..................................................................................................................................10
9Maintenance ...............................................................................................................................................10
10 Trouble shooting and repairing ...................................................................................................................10
11 Accessories..................................................................................................................................................12

1
1Summary
1.1 Model Instruction
LG-125 HA
1.2 Features
This type is especially used on CNC cutting tools and cutting robots；
It’s inverter type with light weight;
The cutting current can be accurately preset;
The high frequency arc pilot device is taken out of the machine, which avoid disturb to the control system;
Expanded metal cutting function, which is specially suitable for automatic machine cutting;
Stable cutting current, immunity to the voltage fluctuation;
100% rated duty cycle, which ensures the machine can work at the maximum current without stopping.
Protection function of over-voltage, low-voltage and overload.
1.3 Applications
It’s used for cutting carbon steel, alloy steel, nonferrous metals and so on;
1.4 Symbol instructions
There are below symbols on this machine.
Read the manual
Gas output
Voltage input
Negative pole
Air pressure
voltage input
Over-heating
Voltage output
Product Classification Code
Rated cutting current
Cutting
Plasma cutting machine

2
Voltage input
abnormal
Power on
Cutting
Power off
Gas checking
Grounding terminal
Current adjusting
Gas input
Cutting ground
cable
Gas/electricity output
Controlling signal
Guiding arc
Expanded metal
cutting
Plate metal cutting
2Operation Environment
To get a good cutting performance, please operate this machine as below environmental requirement
1. Please use the machine in a clear place without any of dust, corrosive gas and inflammables and explosives; Do not
use it in open air and rain;
2. Required air relative humidity should ≤90％(at 20℃)，40℃≤50％(at 40℃)；
3. Environment temperature range should be at-10℃～40℃;
4. Keep the machine away from the wall of some other closure things at least 30cm, two machines distance at least
30cm.
5. Use it under altitude lower than 1000m.
3Specifications and parameter
3.1 Main technical parameters
Name
Unit
Parameter
Rated input voltage
V/Hz
3～380/415V 50/60Hz
Rated input current
A
36.7
Rated input power
KW
18.0
Rated input capacity
KVA
24.1
No-load voltage
V
320
Power factor
-
0.74

3
Efficiency
%
89.5
Rated duty cycle
%
100（40℃）
Rated cutting current/voltage
A/V
125/130
Current adjusted range
A
30～125
Arc pilot type
-
Not-contact type
Plasma gas
-
Air
Gas pressure
Mpa
0.4～0.6
Quality cutting thickness (low
carbon steel)
mm
25(580mm/min)
The maximum cutting thickness
(low carbon steel)
mm
32(400mm/min)
The maximum cutting capacity
(low carbon steel)
mm
38(300mm/min)
Insulation grade
-
F
Cooling mode
-
Air cooling
Protection grade
-
IP21S
Dimension (L*W*H)
mm
670×320×600
Power source net weight
kg
49
3.2 Plasma gas requirement
Pressure range：0.4MPa～0.6MPa
Proof pressure of the gas supply pipe：≥1MPa
Inner diameter of gas supply pipe：Φ5.5
Rate of gas flow：≥280L/min
The gas should not be input into the plasma cutting machine without filtering the water.
3.3 Static External Characteristic Curve (Figure 1)
Figure 1
320 V
U
1 25 A I
199 V

4
4Panel and functions
As figure 2
1. Digital current meter: when it;s not cutting, it displays the preset cutting current. When it’s cutting, it displays the
real cutting current.
2. Power light: It indicates if the machine is on power;
3. Gas pressure light: a light which indicate the compressed air pressure, it lights when the air pressure is higher than
0.2Mpa and lights out when pressure is lower than 0.15Mpa;
4. Start lights: it lights when the machine is on or on cutting process;
5. Overheating lights: it lights when the machine inner temperature is too high(When the cooling fan is broken or the
machine work over the capacity);
6. Power abnormal light: it lights when the input power is abnormal or overload;
7. Current adjusting knot: it adjust the cutting current;
8. Gas control switch: when pressed on gas checking” ”, the gas valve open, to check the gas flow; when pressed
on cutting” “, the valved will be controlled automatically;
9. Cutting mode switch: when pressed on cutting” “, it cuts metal plates; when pressed on cutting” “, it cuts
metal nets;
10. Ground cable plug: it connects the ground cable;
11. The control plug of ignition controller: it connects the control signal of the ignition controller.
12. Negative pole output: it connects with the negative pole input plug of the ignition
controll
绝 缘 等 级 ： F 防 护 等 级 ： IP 21 S
X
I2
U2
100%
f1f2
成 都 华 远 电 器 设 备 有 限 公 司
地 址 ： 成 都 市 武 侯 区 武 侯 科 技 园 武 兴 四 路 5 号
出 厂 编号 :
冷 却 方 式 ： 风 冷
U1=380 V
3 ～ 5 0Hz
3 ～
R
G B15 57 9. 1- 20 13
弧 压 输 出
V
控 制 讯 号
3 ～ 380V
V
Th i s s w it c h i s o n l y u s e d f o r P r o t e ct i o n ！
此 开 关 仅 作 保 护 用
请 另 配 电 源 开 关 ！
7
10
1 1 1 2 1 3
1 4 1 5
1 6
17
18
19
重 量 ： 40kg
型 号 : L G- 13 0 HA
A
V
电 源 气压
V
启动 过热
V
欠 压
8
23456
9
连 续
断续
切 割
试气
A切割电 流
1
名 称 ： 逆 变 式 机 用 等 离 子 切 割 机
3 0A /9 2 V -1 2 5A /1 3 0V
125A
130V
U0=318 V
I1m ax =37A I 1ef f =37A
Figure 2
13. Gas output: it connects with the gas input plug of the ignition controller;
14. Power switch: control the power of the plasma cutting machine;
15. Power input terminal: to connect 3 phase 380V input power;

5
16. The air regulating and filtering device: to adjust the air pressure and filter the water and grease in the air;
17. Connector of arc voltage output: output 1:1 arc voltage , plug 1 is positive and plug 2 is negative, connect it to the
CNC control system with cabtyre cables which is ≥500VDC.
18. Controlling signal: to connect with the CNC cutting machine.
Plug 1 and 2 is the signal outputs of arc striking, it is in short circuit after arc stroke, and it can control the
signals which is lower than 125VAC/0.3Aand 30VDC/1A;
Plug 3 and 4 is the control connector to start the plasma cutting machine, this connector can only be
controlled by one group of switches.
19. The protection grounding terminal: to connect the protection grounding cables.
5System constitute
LG-125HA is constituted by one LG-125HA plasma power source and a QFK-C arc strike ignition, the arc strike ignition is
installed on the walking part of the CNC machine tool, and it is connected with the plasma power source by control cables.
5.1 Some Necessary Equipment Of Cutting
No.
1
2
3
4
5
6
7
8
Name
Plasma
power
source
Arc strike
ignition
General
control
cables
Plasma
cutting
torch
Distribu
tion box
Input power
cables
Work piece
cable
Compressed
air
Model
LG-125HA
QFK-C
QFK-C
HYC-
125A
3phase
380V
≥6mm2×4
≥35mm2
≥280L/min
Note：Note: “The input power cable” is prepared by user according to their actual requirement.
5.2 The cutting system connection please see the （figure 3）
Figure 3

6
6Installation and operation
6.1 Flitting and Lifting
1. Before moving the plasma, make sure the power is off and take out of the power line;
2. When moving, the plasma should never be lie down or inclined;
3. When lifting, it must be lifted vertically;
4. When transported, it must be fixed by foam, and make sure the rain-proof.
6.2 Installation and connection
1. The installation environment must accord with the “二” operation environmental requirement;
2. Check if all the equipment is prepared according to contents in “五”, and install the machine by figure 3;
3. Please cut off the power before installation and connection;
4. If the plasma is put on a slant place, make sure it will not topple and fall;
5. The installation grade of this plasma is IP21S, that means it can not use in rain.
6. Power supply requirement
Voltage fluctuation ≤±15％;
Frequency fluctuation ≤±1％;
The sectional area of cables/lines, the fuse capacity reference table:
Item
Specification
The sectional area of copper power
supply cable (mm2)
6～10
The sectional area of copper grounding
cable (mm2)
4～6
The air break capacity (A)
63
The fuse capacity (A)
80
7. The installation of power supply cable
Firstly cut off the power, then connect the power cable with the distribution box, make sure the right voltage
and connect it carefully;
8. The connection of the grounding cable
Reliably connect the ground cable of green-yellow line to the ground, and make sure to use the right cable
which accord with the specification of above reference table.
9. The installation and connection of the arc strike ignition (refer to figure 3):
The arc strike ignition can be installed on the walking part of CNC machine tool or some other fixed position,
the dimension and size of the arc ignition please check the figure 4, use can install it by actual operation
environment;
Install it on a horizontal position;
Connect the ignition with the plasma power source by the control cables, refer to the figure 3;
Connect the ground cable with ignition terminal and machine tool;
The connection of cutting torch: firstly, connect the M16 nut that on the torch with the brass mouthpiece on
ignition which marked with “gas/electric output”, and screw up the nut; then connect the arc striking line of

7
the torch with binding posts on ignition which marked with”arc striking”, and screw up the nut;
Figure 4 the dimension and size of the arc ignition
10. The connection of compressed air and the operation of pressure regulating filter(The function of pressure
regulating filter, please check the figure 5)
Figure 5
The pressed air must accord with the requirement as in “三” of 2, connect the air hose with the inlet valve on
plasma. The operation of pressure regulating filter: when regulate the pressure, pull up the regulating screw first,
then rotate it, rotate left to reduce the air pressure and rotate right to increase the air pressure, after regulating,
press the screw return.

8
The pressure regulating filter should be checked and discharged water regularly. It must be discharged water
when the water lever arrive to 2/3 of filter cup, or the cutting performance can not be ensured. When discharging
water, cut off the air valve, and press on knob on “check air” on panel, when gas pressure meter indicate on 0,
water will be discharged automatically.
11. The connection of the CNC machine tool: please refer to the 17th and 18th of “四”, connect the control signal of
machine tool and the plasma, the arc voltage signal line should be connected to the CNC control system with
cabtyre cables which is ≥500VDC.
12. The connection of cutting ground cable
13. Connect the quick coupling terminal of grounding cable with connector of “grounding cable” on plasma, screw up,
connect the other terminal of grounding cable with workpiece.
6.3 Usage
1. After complete installation and connections, turn on the power, then the power light will light up.
2. Start the gas supply equipment and open the gas supply switch, then the gas pressure indicator light will light up.
If the gas pressure is lower than 0.2Mpa, the indicator light will not light up, and the gas supply should be checked.
3. Turn the switch on panel to “gas checking”, regulate the pressure regulating filter to get the right pressure, then
turn the switch on “cutting”;
4. Check the indicator lights on panel, only if same as the below table, the machine can cut.
Indicator light
Power
Gas pressure
Overload
Input fault
Status
Light on
Light on
Light off
Light off
5. Start cutting at the edge of the workpiece plate, the distance between nozzle and workpiece should be in a range
of 2~5mm, the axis of nozzle should be vertical with the workpiece. The cnc machine tool send the starting signal,
the compressed gas sprayed out from nozzle, after pre-gas, high frequency is produced and then the arc stroke,
the machine start walking and cutting.
7Working principal
IGBT is chosen to the main component of the inverter switch in the main circuit. The AC power is rectified to
20KHz high frequency current by full-bridge power frequency. The high frequency current is step-down by high
frequency transformer, rectified by recovery diode and filtered by reactor, then output the cutting current. The
control circuit control the output current by controlling the width of driving pulse. The cutting current ampere of
real-time is obtained by electric current transducer cascaded on output terminal, as a negative feedback control
signal, it will be compared with current adjusting signal, then input it to the special PWM modulation integrated
circuit, output controlled driven pulse to control the IGBT to get a constant current , then get a constant current
external characteristic. The arc striking is non-contact type.
For main circuit diagram please check the attached Figure 1, and for Principal block diagram Please check the
figure 6 below:

9
Figure 6 Principal block diagram
List of some common Components
No.
Code
Name
Model
Remarks
1
V1
Rectifier bridge module
MDS100-12
2
V2、V3
IGBT module
2MBI100VA-120-50
3
V4～V9
Diode module
DBA200UA60
4
TA1、TA2
Hall sensor
HAS 100-S/SP50
5
QF1
Air switch
DZ47-63/3P D63
6
R5
Resistance
RXG7-10Ω/50W
7
YV1、YV2
Gas valve
DF2-2（3）-B/AC36V
8
EV1
Cooling fan
200FZY6-S
9
RP1
Potential-meter
B502
10
KT1
Temperature Potential-
meter
JUC-6F-75℃always close
11
BP1
Pressure controller
YKC 0.2/0.15
12
AP1
Main control board
LGK7-AP1
13
AP2
Driving board
LGK7-AP2
14
AP3
High frequency board
HFAP1-A3
15
AP5
Arc starting board
PK06-A1

10
16
AP6
Arc striking board
PL06-A1
17
Air pressure regulating
filter
GFR-200-08
18
XS6
Ten cores socket
WS24K10Z
8Protection instruction
Pressure protection
1. When the gas pressure is lower than 0.2 MPa, the protection circuit woks and plasma will stop working;
2. When cutting, if the pressure is lower than 0.15 MPa, the cutting arc will stop;
Note: the cutting pressure could only be adjusted when press the switch to “Air checking” on panel!
Over-heating protection
When environmental temperature is higher than 40℃or anything abnormal of cooling fan, working on rated
cutting current, if the plasma is over-heating, the over-heating protection circuit start to work and cutting stop.
Voltage Input fault protection
Any phase default or 20% higher or lower than standard voltage, the protection circuit works, and plasma stop
working.
9Maintenance
1.The machine should not be used or store in the sun;
2.The machine should not be used or store in the wet;
3.The air hole should not be covered when using;
4.The cover should be opened at least once a year to clear the inner impurities and sundries;
5.Regularly check all the insulation of cables, anything broken, it should be repaired soon;
6.Regularly check all the connections of machine, if anything loosen, it should be tighten soon;
7.Regularly clear the water and dirties in pressure regulating filter.
Note: when repair or maintenance, let a professional electrician remove the power line in distribution box,
then open the cover.
10 Trouble shooting and repairing
There is high voltage inside the machine, only professional electrician could repair the machine;
If anything wrong, please firstly check:
1、If the distribute voltage is normal and stable;
2、If the input fault indicator on panel light on, then check the power switch of distributor, fuse and power line, if
anything broken, the plasma stops;

11
3、Check if there is anything broken on connections, torch nozzles and electrodes;
4、Check if there are any connection faults on machine tools control signals,
5、Check if the ground cable is connected well;
6、Check if water in pressure regulating filter is discharged;
7、If the gas pressure indicator on panel is light off, check if the gas hose is connected well and check if the pressure is
normal;
8、If the over-heating indicator on panel light on, check the temperature relay;
9、Open the cover and check the fuse beside the controlling transformer;
Trouble shooting and repairing
Troubles/problems
Possible reasons
Trouble shooting
1．Turn power on, the
power indicator light
off, digital meter light
off
1．Default phase;
2．Switch of power supply damaged;
3．1.5A power controlling fuse
damaged;
1．Check the 3 phase power supply;
2．Change a new power switch;
3．Change a new power fuse;
2．No arc striking,
input fault indicator
lights on
1．Default phase;
2．Over voltage of under voltage;
Check the power supply voltage;
4．No arc striking or
arc stops when cutting,
the over-heating
indicator lights on
1．Environmental temperature is too
high;
2．The cooling fan is broken;
3．The temperature relay is damaged;
1．Stop the machine and rest for a while;
2．Check the power of fan or change a new
cooling fan;
3．Change a new temperature relay;
5．Machine Can not
start, gas pressure
indicator lights off
1．No gas pressure;
2．Gas pressure is too low;
1．Connect the gas supply;
2．Adjust the gas pressure;
6．No arc striking, gas
pressure indicator lights
on, input fault indicator
lights off, over-heating
indicator lights off
1．Poor connection of grounding cable;
2．The gas pressure is too high;
3．The torch nozzles and electrodes are
broken;
4．The torch is broken;
5．The nozzle contacts with the
workpiece;
1．Connect the ground cable well;
2．Lower the pressure;
3．Change nozzles and electrodes;
4．Change torch;
5．Lifting the torch to a proper 2~5mm
distance;
7．Poor cutting quality
1．Wrong gas pressure;
2．Too thick workpice plate;
3．The torch nozzles and electrodes are
broken;
4．The plasma arc is not vertical with
1．Adjust the gas pressure;
2．Choose a proper thickness to cut;
3．Change nozzles and electrodes;
4．Adjust the torch angle;

12
workpiece；
5．Wrong cutting speed;
5．Adjust the cutting speed;
8．Too short working
life of nozzle and
electrode
1．The gas pressure is too low;
2．The nozzle is too close with the
workpiece;
1．Adjust the gas pressure;
2．Adjust to a proper 2~5mm distance;
11 Accessories
No.
Choose
Name
Qty
1
□
LG-125HA power source
1
2
□
QFK-C1arc striking ignition
1
3
□
General controlling cables
1
4
□
Cutting torch
1
5
□
Ground cables
1
6
□
Electrode
2
7
□
Nozzle
4
8
□
Swirl ring
1
9
□
Fuse
2
10
□
Operation manual and certificate
1
Note: The real packing list please refer to the items which are marked □
√.

13
1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
LG-125HA主电路原理图 HYLG125HA-06-001
QF1
C5
40 U/14 00VDC
V2
SKM10 0GB1 28D V3
SKM10 0GB1 28D
R1
R2
C17
C6
5U/500 VAC
TM1
TA2
V4 V7
L4
C2C1
CBB22 /100n/630V
C3 XS2
XS3
L1
L3
C7
FU1 1.5A
EV1 风扇
D40
V1
＋15V
1
Out
3
-15V
2
0V
4
TA1
TC1
18 V 18 V 8V
38 0V 22 0V 41 5V
过热 欠压
28 3839
37
电源
29
HL4 HL5HL1
KT1
3635
59
30 31 32 33 34
46 45 44 43
PA1
65 66 . 67 68 .
G2 E2 G1E1
G4 E4 G3E3
G1 G2
G3 G4
G1G2
G3G4 E1E2
E3E4
E1 E2
E3 E4
1 2 3 4
5
6
7
8
9 10 11
18 .
12
72
73
75 76
74 22
23
25
24
AP2
60 . 62
626059
61
切割电流
53
5216
17
50
15
AP1
检气
切割
68 .
17
15 V
11 0V 36 V
40 41 42
RP1
5K
V5 V6
13
BP1
气压开关
58 57
启动
HL3
气压
HL2
54 55
51
63 64
13
71
C8 C9 27
AP4
TC 2
38 0V 41 5V
L5
7 8
6.
SA 2
99
16
81 82 83 84
43 A 44A 45 A46A G
43 44 45 46 4177 78
＋15V
1
Out
3
-15V
2
0V
4
TA2
RV1
R5
R6 R7
2
3
14
5
C5
77 78
C25
13 18
36 VAC
THF1
YV1 YV2
17
99
18
68 15
AP5
68 90
68 B
90 B
27
25
27 A
25
27 B 25
起弧控制器
气电输出
3 1 7 6 4
18 17 9968 15
31 5 7 6
C18 C19
53 51 63 64
引弧成功
启动信号
数控 接口
64 63
51
53
1 2 3 4
24
25
弧压信号（XS4）
FU2 1.5A
80 79 SA1
连续 断续
引导弧电缆
E
V8
6463
13 18
53
51
13
18
41
AP6
设计 肖春茂 时间 修改 时间 审核 时间 图号 共1 张第1 张
图纸名称
成都华远电器设备有限公司
2014.10.31 批准 时间
起弧控制器接口（十芯插座）
27 27 27
8 9 10
27 27
27
27 27
18
8 9 10 5
18
4
V9
27
27
XS6
XS5
XS1
90 68 .
98 .99 .
AP3
C14

14
The final explanation rights reserved to Huayuan Company!
If there is any changes in the manual instruction, forgive not to inform
separately!
Chengdu Huayuan Electric equipment Co.,Ltd.
Address: Wuhou National Science Park, Chengdu, China
Postcode: 610045
Telephone:[phone]
Fax:[phone]
E-mail: [e-mail] [email protected]
www.hwayuan.com