MODEL: ARC200(Z104)/ARC200(Z276)ARC140(Z269)/

ARC200D(Z225)/ARC250D(Z226)/ARC250(Z227)

INVERTER WELDEROPERATOR’S MANUAL

FORWARD

SHENZHEN JASIC TECHNOLOGY CO., LTD.

Address: No. 3, Qinglan 1st Road, Pingshan District, Shenzhen, Guangdong, China

Postcode: 518118

Tel: 0755-29651666Fax: 0755-27364108

Website: http://www.jasictech.com E-mail: sales jasictech.com

Version A0:

SAFETY

Precautions for installation

Beware of electric shock!

Install grounding device according to application standard.

Do not touch live parts with naked skin, wet gloves or wet clothes.

Be sure you are insulated from ground and workpiece.

Cover the cover plate of the machine before power on to avoid anelectric shock.

Confirm the safety of your working position.

Beware of fire hazard!

Please install the machine on non-combustible materials to avoida fire.

Make ensure there are no inflammables near the welding positionto avoid a fire.

Beware of explosion !

Do not install the machine in an environment with explosive gasto avoid an explosion.

Replacing the components can be dangerous.

Only professionals can replace the components of the machine.

Make sure the connecting wires inside the machine are correctly connected after replacing the PCBs, and then the machine can be run. Otherwise, there is a risk of damage toproperty.

Make sure there are no foreign bodies such as wire leads, screws, gaskets and metal barsfalling into the machine inside when replacing the components.

Precautions for operation

Smoke-may be harmful to your health!Keep your head away from the smoke to avoid inhalation of waste gas in welding.Keep the working environment well ventilated with exhaust or ventilationequipment when welding.

Arc radiation-may hurt your eyes and burn your skin!

Use proper welding mask and wear protective clothing to protect youreyes and body.Use proper mask or curtain to protect onlooker from being injured.

Magnetic field can make cardiac pacemaker a bit wonky!

Stay away from the welding source to reduce the affect of magnetic filed.

Improper use and operation may result in a fire or an explosion!

Welding spark may result in a fire, so please make ensure there are noinflammables near the welding position, and pay attention to fire safety.Ensure there is fire extinguisher nearby, and make sure someone hasbeen trained to operate the fire extinguisher.Do not weld closed container.Do not use this machine for pipe thawing.

Hot workpiece can cause severe scald!Do not touch hot workpiece with bare hands.

Cool the welding torch for a while after continuously working.

Excessive noise does great harm to people’s hearing!Wear ear covers or other hearing protectors when welding.

Give warning to onlooker that noise may be potentially hazardous tohearing.

Moving parts may injure your body!

Please keep away from moving parts (like fan).

Each door, panel, cover, baffle plate, and protective device the like should be closed and located correctly.

Seek professional support when trouble strikes!

When trouble strikes in installation and operation, please inspectaccording to related contents in this manual.

If you still cannot understand fully, or you still cannot solve the problem,

Precautions for discard

Pay attention to the following when discarding the welding machine:

Burning the plastic parts such as the front panel may produce poisonous gas.

Dispose it as industrial waste.

Burning the electrolytic capacitors in the main circuit or on the PCBs may cause an explosion.

People with cardiac pacemaker should consult the doctor before carryingout welding.

please contact the dealer or the service center of JASIC to obtain professional support.

TABLE OF CONTENTS

1

ARC200(Z104)

ARC200(Z276) ARC200D(Z225) ARC250D(Z226)

ARC250(Z227)

65.1 8 6 8 7 9.6 8

Rated input current(A) 24.3 26 40.8 32.2 24.8 37.4 29.7 14

6 7.1 9.4 7.1 9.4 11.3 9.58.2

Rated output (A/V)

Rated duty cycle(%)

No-load voltage(V)

Efficiency (%)

40%40%

6062

F

0.7 0.7 0.7 0.7 0.7 0.7

IP21S

85 85 85858585

40%40%30%40%

67 70 70 62 6060

20 200~ 20 180~ 20 230~ 20 250~20 0~16

0 60~0 60~0 60~

20 200~

0 100~

20 170~20 140~

1. GENERAL DESCRIPTION

1.1 Model coding

ARC XXX (XXXX)X

Product code

Vacancy: single voltage

D: double voltage

Code for rated output current

Inverter DC MMA welder

Figure 1 1: Model coding-

1.2 Technical parameters

Table 1 1: General technical parameters-

ItemsModels

Air cooling

Single phase AC230V 50Hz-

ARC140(Z269)

Rated inputpower (KW)

Cooling mode

Insulation grade

Power factor

Rated inputcapacity KVA( )

Rated inputpower supply

Weldingcurrent range (A)

Arc forcecurrent range(A)

AC230V 50Hz

140/25.6 170/26.8 200/28.0 160/26.4 180/27.2200/28.0 230/29.2 250/30.0

Enclosure ingress protection

Single-phase

AC380V 50Hz

3-phaseSingle-phase

AC230V 50Hz

Single-phase

AC380V 50Hz

Single-phase

AC380V 50Hz

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2

L

ARC200(Z104)

ARC200(Z276)

ARC200D(Z225)

ARC250D(Z226)

Weight Kg( )

ARC140(Z269)

ARC250(Z227)

430 168 312* *312 143 256* * 430 168 312* * 430 168 312* * 430 168 312* * 430 168 312* *

5.04.8 8.0 9.6 9.6 9.6

1.3 Size and weight

Table 1-2: Overall size and weight of the machine

Model

Overall size(L*W*H)

Figure 1-2: Appearance and size of the machine Unit: mm( )

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W

L

H

Z104

OC

H

W

H

W

ARC140 (Z269) 1

DKJ16-25(black) 2

1

ARC200 (Z104)

DKJ35-50(black)

ARC200(Z276)

DKJ35-50(black)

10046173

10004613

10046171

10004614

10046174

10004614

10047281

10047281

10047281

第一章 产品概述

33

1.4 Composition and configuration of the welding machine system

1) Composition

Figure 1-3: Composition of the welding machine system

2 Configuration)

Table 1-3: Configuration of ARC200 Z269( )

Name

Welding machine

Quick plug

Operator’s manual

Table 1-4: Configuration of ARC200 104) (Z

Table 1-5: Configuration of ARC200 276) (Z

Material code Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

1

2

1

Name

Welding machine

Quick plug

Operator’s manual

Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

1

2

1

Name

Welding machine

Quick plug

Operator’s manual

Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

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Material code

Material code

Material code

ARC200D(Z225)

ARC250D(Z226)

ARC250(Z227)

10004614

10046196

10004614

10046195

10004614

10046188

10047281

10047281

10047281

4

Table 1-6: Configuration of ARC200D 225 (Z )

Table 1-7: Configuration of ARC250D 226 (Z )

Table 1-8: Configuration of ARC250 227 (Z )

1.5 Functions and characteristics of the welding machine

ARC series are inverter welding machines made by our company with advanced invertertechnology. These machines are mature models and with stable performance. This seriesincludes several single-voltage and double-voltage models.

1

2

1

Name

Welding machine

Quick plug

Operator’s manual

Material code Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

1

2

1

Name

Welding machine

Quick plug

Operator’s manual

Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

1

2

1

Name

Welding machine

Quick plug

Operator’s manual

Specification Quantity pcs ( ) Remark

Standard configuration

ARC series

Standard configuration

Standard configuration

DKJ35-50(black)

DKJ35-50(black)

DKJ35-50(black)

Great reduction in magnetic and resistance loss obviously enhances the welding efficiencyand energy saving effect.

Advanced VMOS or IGBT inverter technology

High inverter frequency greatly reduces the volume and weight of the welding machine.

Working frequency is beyond audiorange, which almost eliminates noise pollution.

Leading control mode

Advanced control technology meets various welding applications and greatly improves thewelding performanceIt can be widely used in acid and basic electrode welding.

Easy arc ignition, little spatter, stable current and good shaping.

Common characteristics of MMA welding machines

Portable, energy saving, with excellent dynamic characteristics and high efficiency, stablearc, molten pool easy to control, higher no-load voltage, better compensation of power andarc force, able to meet various welding requirements, applicable to aerial work, field work,indoor and outdoor decoration, etc.

Characteristics of double-voltage models It adopts automatic switching mode for voltage.

Unique circuit design prolongs the service life of the capacitor and IGBT.

New air duct design balances the temperature inside the machine and prolongs the servicelife of the components and machine.

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Material code

5

U2(V)

U0

I2(A)

q(%)

40

0

20

60

80

100

50 100 150 200 250 I2(A)

1.6 System characteristics

Figure 1-5: Duty cycle

Figure 1-6: Output characteristic curves

1) Duty cycle

ARC140(Z269)

ARC200(Z104)

ARC200D(Z225)

ARC250D(Z226)

ARC200(Z276)

ARC250(Z277)

2) Output characteristics

External characteristic of maximum output

External characteristic of minimum output

Relationship with ratedload

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6

1 Output cable 2 Rubber sleeve3 Copper sleeve 4 Bolt

1 2 3 54 5 Copper connector

2. INSTALLATION AND CONNECTION

2.1 Installation requirements

In order to ensure personal safety and avoid electric shock, please ground the machine reliablyby connecting the ground wire (yellow-green wire) of the machine to the grounding device inthe switching box.

Insert the plugs with the cable of the electrode holder and the cable of the earth clamp respectivelyinto the quick sockets on the front panel of the machine, and tighten them to clockwise.

Operator can choose DCEN connection according to workpiece and electrode applicationrequirement. Generally, DCEP connection is recommended for basic electrode, while there isno special requirement for acid electrode.

DCEN: Connect the electrode holder to “-” outputterminal, and the workpiece to “+” output terminal.

DCEP: Connect the electrode holder to “+” outputterminal, and the work clamp to “-” output terminal.

Figure 2-1: Connection of output cable

Figure 2-2: Connection of quick plug

1) Connection of input cable

A primary power supply cable is available for this welding machine. Connect the power supplycable to the rated input power. The primary cable should be tightly connected to the correctsocket to avoid oxidization. Check whether the voltage value varies in acceptable range with amulti-meter.

The cross section of the leads used in the switching box should meet the requirements of themaximum input capacity of the machine.

2) Connection of output cable

3) Connection of welding instruments

4

1

2

3 5

1

24

3 5 1 Output cable 2 Rubber sleeve3 Copper sleeve 4 Bolt

5 Electrode holder

Figure 2-3: Connection of electrode holder

1 Output cable 2 Copper clip3 Bolt 4 Nut

5 Iron clip

Figure 2-4: Connection of earth clamp

2. IN

STA

LLAT

ION

AN

D C

ON

NE

CTI

ON

7

1.0 20 ~ 60

1.6 44 ~ 84

2.0 60 ~ 100

2.5 80 ~ 120

3.2 108 ~ 148

4.0 140 ~ 180

5.0

7.0

180 220 ~

220 ~ 260

20.8 ~ 22.4

21.76 23.36 ~

22.4 ~ 24.0

23.2 ~ 24.8

23.32 ~ 24.92

24.6 ~ 27.2

28.8 ~ 30.4

27.2 ~ 28.8

4) Preset the welding current according to the type and size of the electrode, clip the electrodeand then welding can be carried out by short circuit arc starting. For welding parameters, pleaserefer to the table below.

Table 2-1: Welding parameters table (for reference only)

Electrode dia. (mm) Recommended welding current (A) Recommended welding voltage (V)

Note: This table is suitable for mild steel welding. For other materials, consult related materialsand welding process for reference.

2.2 Precautions

2. INS

TALLATIO

N A

ND

CO

NN

EC

TION

8

1 2

1

2

3

4

5

3. OPERATION

3.1 Operation method

3.2 Panel functions of ARC140 (Z269)

Figure 3-1: Front panel of Z269

Figure 3-2: Back panel of Z269

1

2

3

4

5

No. Part name Function

Powerindicator

To indicate the machine is powered onwhen it illuminates.

“+” terminal

output To connect the welding output cable.

Overheatingindicator

Currentcontrol knob To adjust the output current value.

“-” terminal

output To connect the welding output cable.

31

2

3

No. Part name Function

Powerswitch

To control the ON/OFF of the inputpower of the machine.

Cable For power supply input.

Cooling fanFor heat dissipation through forcedair cooling.

To indicate the temperature inside the machineis too high and the machine is under overheatingprotection status when it illuminates.

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1 04

Z104

Fault

1

2

3

No. Part name Function

Powerswitch

To control the ON/OFF of the inputpower of the machine.

Cable For power supply input.

Cooling fanFor heat dissipation through forcedair cooling.

9

1

2

3

4

5

6

1

2

3

1

2

3

4

5

No. Part name Function

Powerindicator

To indicate the machine is powered onwhen it illuminates.

“+” terminal

outputTo connect the welding output cable.

Currentcontrol knob

To adjust the output current value.

“-” terminal

outputTo connect the welding output cable.

6

Digital meter To display the welding current.

Abnormityindicator

To indicate the machine is underovercurrent or overheating protectionstatus when it illuminates.

Figure 3-3: Front panel of Z104

Figure 3-4: Back panel of Z104

3.3 Panel functions of ARC200 Z104 ( )

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OC

10

1

2

3

4

5

6

7

1

3

2

1

2

3

4

5

No. Part name Function

“+” terminal

output

To connect the welding output cable.

Currentcontrol knob

To adjust the output current value.

“-” terminal

output

To connect the welding output cable.

6

Digital meter To display the welding current.

1

2

3

No. Part name Function

Powerswitch

To control the ON/OFF of the inputpower of the machine.

Cable For power supply input.

Cooling fanFor heat dissipation through forcedair cooling.

3.4 Panel functions of ARC200 Z276 ( )

7

Figure 3-6: Back panel of Z276

Figure 3-5: Front panel of Z276

Arc forcecontrol knob

To adjust the arc force current value.

Overheatingindicator

To indicate the temperature inside the machineis too high and the machine is under overheatingprotection status when it illuminates.

Overcurrentindicator

To indicate the machine is under overcurrentprotection status when it illuminates.

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PE

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220V

380V

Z225

1

2

3

No. Part name Function

Powerswitch

To control the ON/OFF of the inputpower of the machine.

Cable For power supply input.

Cooling fanFor heat dissipation through forcedair cooling.

11

3.5 Panel functions of ARC200D Z225 RC250D 226) ( )/A (Z

Figure 3-7: Front panel of Z225 226/Z

Figure 3-8 Back panel of Z225 226: /Z

1

2

3

4

5

No. Part name Function

“+” terminal

output

To connect the welding output cable.

Currentcontrol knob To adjust the output current value.

“-” terminal

output

To connect the welding output cable.

6

Digital meter To display the welding current.

7

Arc forcecontrol knob

To adjust the arc force current value.

Overheatingindicator

To indicate the temperature inside the machineis too high and the machine is under overheatingprotection status when it illuminates.

1

2

3

4

5

6

7

8

2

3

1

Voltageindicator

To indicate 220V is used when itilluminates.

8

Voltageindicator

To indicate 380V is used when itilluminates.

3. O

PE

RA

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200

Z227

12

1

2

3

1

2

3

4

5

6

7

Figure 3-9: Front panel of Z227

Figure 3-10: Back panel of Z227

1

2

3

4

5

No. Part name Function

“+” terminal

output

To connect the welding output cable.

Currentcontrol knob

To adjust the output current value.

“-” terminal

output

To connect the welding output cable.

6

Digital meter To display the welding current.

7

Arc forcecontrol knob

To adjust the arc force current value.

Overcurrentindicator

To indicate the machine is under overcurrentprotection status when it illuminates.

1

2

3

No. Part name Function

Powerswitch

To control the ON/OFF of the inputpower of the machine.

Cable For power supply input.

Cooling fanFor heat dissipation through forcedair cooling.

3.6 Panel functions of ARC250 Z227 ( )

Powerindicator

To indicate the machine is powered onwhen it illuminates.

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PE

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4. MAINTENANCE

4.1 Daily maintenance

WARNING

The power of the switching box and the welding machine should be shut down beforedaily checking (except appearance checking without contacting the conductive body)to avoid personal injury accidents such as electric shock and burns.

Table 4-1: Daily checking of the welding machine

Items Checking requirements Remarks

Front panel

Back panel

Cover

Chassis

Routine

Whether any of the components are damagedor loosely connected;

Whether the output quick sockets are tightened;Whether the abnormity indicator illuminates.

Whether the input power cable and buckle arein good condition;

Whether the air intake is unobstructed.

Whether the bolts are loosely connected.

Whether the screws are loosely connected.

Whether the machine enclosure has color fadingor overheating problems;

Whether the fan sounds normal when the machineis running;

Whether there is abnormal smell, abnormalvibration or noise when the machine is running.

Earth cable

Welding cable

Whether the grounding wires (including workpieceGND wire and welding machine GND wire) break off.

Whether the insulating layer of the cable is worn,or the conductive part of the cable is exposed;

Whether the cable is drawn by an external force;

Whether the cable connected to the workpieceis well connected.

Items Checking requirements Remarks

Table 4-2: Daily checking of the cables

If unqualified, check the interiorof the machine, and tighten orreplace the components.

If unqualified, tighten or replacethe components.

If abnormal, check the interiorof the machine.

If unqualified, tighten or replacethe components.

4. M

AIN

TE

NA

NC

E

Use appropriate methodsaccording to the work sitesituation to ensure safetyand normal welding.

14

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NC

E

4.2 Periodic check

WARNING

Periodic check should be carried out by qualified professionals to ensure safety.Thepower of the switching box and the welding machine should be shut downbefore periodic check to avoid personal injury accidents such as electric shockand burns. Due to the discharge of capacitors, checking should be carried out5 minutes after the machine is powered off.

Tips:

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Table 5-1: Troubleshooting for ARC200 104 (Z )

Malfunction Phenomena Cause and Solution

The power indicator/meterdisplay does not illuminate;the fan does not work; nowelding output.

The power indicator/meterdisplay illuminates;the fan does not work;no welding output.

The fan works; the outputcurrent is unstable or cannotbe controlled by potentiometerwhen welding.

no welding output.

The fan works;the abnormity indicatorilluminates;no welding output.

The electrode holder becomesvery hot.

Excessive spatter in MMAwelding.

5. TROUBLESHOOTING

The fan works; the powerindicator and meter displayare normal;

b. The power switch is continuously switched on and off in a short time, which leads to overvoltage protection. Shut down the machine and restart it after 5~10 minutes, and then it will recover.

d. The 24V relay on the power PCB is damaged or not closed. Check the 24V power supply and the relay. Replace the relay if necessary.

a. Make sure that the mains voltage is normal.b. Check if the connecting wires on the control PCB are reliably connected.c. Check if the current adjustment potentiometer is damaged, and replace it if necessary.d. Replace the control module on the top PCB.

c. Check if the driving MOSFET Z24/9Z24 for VT7-VT10 on the top PCB is damaged, and replace it if necessary.d. The control circuit fails. Please contact your distributor or JASIC.

( )

a. The rated current of the electrode holder is smaller than its actual working current. Replace it with a bigger rated current.b. Check if the screw or wire of the electrode holder is reliably connected.

The output polarity connection is incorrect. Exchange the polarity.

e. Power it on, and switch the digital multimeter to DC 1000V. Check if there is 310V DC at both terminals of the DC bus CON4 on the top PCB. If there is, replace the top PCB. Otherwise,

replace the bottom PCB.

a. Make sure that the mains voltage is normal.

b. Make sure that the input cable is reliably connected to the power switch, and that the power switch can be switched on or off normally.

c. Check whether any of the silicon bridge, MOS tube or rectifier diode are damaged, and whether the gate resistor is burned out. Replace them if necessary.

d. Check whether the connecting wires on PCBs are reliably connected.

a. The 220V input power is unstable (the input cable is too thin and too long), which leads to overvoltage protection. Replace the input cable with a larger diameter and tighten the joint. Shut down the machine and restart it after 5~10 minutes, and then it will recover.

c. The wire connecting the power switch with the power PCB breaks is loosely connected. Tighten it.

a. Open circuit or poor contact problems exit at the joints of output terminals.b. There is about DC 310V from the power PCB to CON4 (VH-07) on the top PCB. Check if the silicon bridge breaks or is not well connected. 2) Check if any of the 5 big electrolytic capacitors (470uF/400V) have leakage problem, and replace them if necessary.

b. Overheating protection occurs. It will recover automatically after 5~10 minutes.

d. The feedback circuit (wire) fails.

c. The inverter circuit fails. Pull out the power supply socket (near the fan VH-07) for the main transformer on the top PCB, and restart the machine. 1) If the abnormity indicator still illuminates, some of the MOSFETs on the top PCB

is damaged. Replace it if necessary.

Some of the secondary rectifier diodes of the transformer may be damaged. Replaceit if necessary.

2) If the abnormity indicator does not illuminate:The transformer on the center PCB may be damaged. Check the inductance andQ value of the primary of the main transformer. The primary of the transformer isparalleled. For a single main transformer, L=1.5~2.4mH, Q>40. Replace the maintransformer when the inductance and Q value is small.

a. Overcurrent protection occurs. Shut down the machine, and restart it after the abnormity indicator does not illuminate, and then it will recover .

16

The power indicator doesnot illuminate;the fan does not work;no welding output.

a. Check if the connecting wires on PCBs are reliably connected.b. Open circuit or poor contact problems exit at the joints of output terminals.

Notes:

[4] The center PCB for ARC140 269 is PD-47, and the top PCB for ARC200 276 is PD-53. (Z ) (Z )

a. Make sure that the mains voltage is normal.b. Make sure that the input cable is reliably connected to the power switch, and that the power switch can be switched on or off normally.c. Check whether any of the silicon bridge, IGBT or rectifier diode are damaged, and whether the gate resistor is burned out. Replace them if necessary.d. Power it on, and switch the digital multimeter to DC V. Check if there is 310V DC at both terminals of the DC bus on the top PCB If there is, replace the top PCB. Otherwise, replace the bottom PCB

[1] [2]. [3].

a. Make sure that the mains voltage is normal.

b. Check if the connecting wires on the control PCB are reliably connected.c. Check if the current adjustment potentiometer is damaged, and replace it if necessary.d. Replace the control PCB→rectifier PCB.

c. The protection indicator illuminates: Pull out the thermal switch, and check if the protection indicator still illuminates. If so, replace the control PCB. Otherwise,the machine is under overheating protection. In this condition, it is unnecessary to pull out the power plug, and it will recover automatically after 5~10 minutes when the machine is cooled down.d. The protection indicator does not illuminate and there is no output: Pull out

the thermal switch, and check if there is no-load voltage. If there is, the thermal switch is damaged. Otherwise, connect the metal part of 7815 with the black probe and connect the metal part of IRF9Z24 or IRFZ24 with the red probe, the check if the voltage is about 8.4V. If it is, replace the center PCB Otherwise, replace the top PCB.

[4].

Table 5-2 Troubleshooting for ARC140 269 RC200 276: (Z )/A (Z )

Malfunction Phenomena Cause and Solution

the output current is unstableor cannot be controlled bypotentiometer when welding.

The fan works;

the power indicator is normal;The fan works;

no welding output.

The electrode holder becomesvery hot.

a. The rated current of the electrode holder is smaller than its actual working current. Replace it with a bigger rated current.b. Check if the screw or wire of the electrode holder is reliably connected.

Excessive spatter in MMAwelding.

The output polarity connection is incorrect. Exchange the polarity.

[1] The DC bus for ARC140 (Z269) is P8, and the DC bus for ARC200 (Z276) is P9.

[2] The top PCB for ARC140 (Z269) is PM-48, and the top PCB for ARC200 ( 276) is PM-47.Z

[3] The bottom PCB for ARC140 (Z269) is PZ-75, and the top PCB for ARC200 (Z276) is PZ-86.

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Table 5-3: Troubleshooting for ARC200D 225 RC250D 226 RC250 227 (Z )/A (Z )/A (Z )

The power indicator doesnot illuminate;the fan does not work;no welding output.

The power indicatorilluminates;the fan does not work;no welding output.

the output current is unstableor cannot be controlled bypotentiometer when welding.

the power indicator isnormal;no welding output.

The 220V indicator illuminateswhen connecting the machineto AC 380V (only for Z225 andZ226)

Malfunction Phenomena Cause and Solution

The fan works;

The fan works;

Excessive spatter in MMAwelding.

a. Make sure that the power switch is closed.

b. Make sure that the input voltage is normal.

a. The wire connecting the power switch with the power PCB breaks is looselyconnected. Tighten it.

b. The 24V relay on the power PCB is damaged or not closed. Check the 24V power supply and the relay. Replace the relay if necessary.

a. Check if the current adjustment potentiometer is damaged, and replace it if necessary.b. Check all joints (esp. connectors) for reliable connection.

a. The mains voltage is below AC 310V. Check if there is any high-power machine working nearby, which leads to the low mains voltage.b. Check if the chip for judging voltage switching IC5 on the top PCB is damaged, and replace it if necessary.

a. Delay circuit is added for this machine to improve the reliability, so there is no output within 5 seconds after the machine is powered on, while the fan and power indicator appear normal. If there is still no output after 10 seconds or a longer time after the machine is powered on, do the following checking.

b. Check if the connecting wires inside the machine are reliably connected.

c. Open circuit or poor contact problems exit at the joints of output terminals.

1) Themachine is under overheating protection. In this condition, it is unnecessary to pull out the power plug, and it will recover automatically after 5~10 minutes when the machine is cooled down.

e. The protection indicator does not illuminate: Shut down the machine, and check with a multimeter whether the two output terminals are short circuited. If so, check if any of the diode or transformer on the center PCB is damaged or short circuited. Replace them if necessary.

d. The overheating protection indicator illuminates:

2) Check if the thermal switch is damaged, and replace it if necessary.

The output polarity connection is incorrect. Exchange the polarity.

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