Hong Kong Easyweld Easytig 160S User manual

1
EasyTig
Operation Manual
Model: Easytig 160S/ 200S/ 180A/ 200A/
200ADS/ 200P/ WS 00/ WS400/ WSM 00/
WSM400
Hong Kong Easyweld Limited

2
CONTENTS
- Warning
- General Description 4
- Main Parameter 5
- Installation and Operation 7
- Speed-Read Table 11
- Problem Possibly Occur 12
- Caution 1
- Maintenance 1
- Troubleshooting 14
\
EC DECLARRATION OF CONFORMITY
Hereby we declare that our machines for industrial and professional use as
stated below
Type: EasyTig 160S, 200S, 180A, 200A, 200ADS,
Conform the EMC Directives: 7 /2 /EEC and 89/ 6/EEC
European Standard: EN/1EC60974
Please read and understand this instruction manual carefully before the
installation and operation of this equipment.
The contents of this manual may be revised without prior notice and without
obligation. This revised instruction manual is issued on 1st November 2008.

3
WARNING
Welding and cutting is dangerous to the operator, people in or near the working area, and
the surrounding, if the equipment is not correctly operated. Therefore, the performance of
welding/cutting must only be under the strict and comprehensive observance of all
relevant safety regulations. Please read and understand this instruction manual carefully
before the installation and operation.
• The switching of function modes is possibly damaging to the
equipment, while the welding operation is performed.
• Do disconnect the electrode-holder cable with the equipment,
before the performance of welding.
• A safety switch is necessary to prevent the equipment from
electric-leakage.
• Welding tools should be of high quality.
• Operators should be qualified.
Electric Shoc : It may be fatal
• connect the earth cable according to standard regulation.
• Avoid all contact with live components of the
welding circuit, electrodes and wires with bare hands. It is
necessary for the operator to wear dry welding gloves while he
performs the welding task.
• The operator should keep the working piece insulating from
himself/herself.
Smo e and Gas generated wile welding or cutting:
harmful to people’s health.
• Avoid of breathing the smoke and gas of welding or cutting.
• Keep the working area in good ventilation.
Arc light-emission: harmful to people’s eyes and s in
• Wear the welding helmet, anti-radiation glass and work
clothes while the welding operation is performed.
• Measures also should be taken to protect people in or
near the working area.
Fire hazard
• The welding splash may cause fire, thus remove flammable
material away from the working place.
• Have a fire extinguisher nearby, and have a train fire person
ready to use it.
Noise: Possibly harmful to peoples’ hearing.
• Surface noise is generated while welding/cutting, the
hearing aids is necessary in some cases.
Machine Fault:
• Consult this instruction manual.
• Contact your local dealer or supplier for further advice.

4
GENERAL DESCRIPTION
This welding machine is manufactured with advanced inverter technology. With high-power
component MOSFETS and by adopting PWM technology, the inverter convert the DC voltage, which
is rectified from input AC voltage, to high 100KHz frequency AC voltage; as a consequence, the
voltage is transformed and rectified. Therefore, it result the much more small-sized of the main
transformer and lighter in weight of the inverter welder, which rates the performance of welding by
0%. The high frequency oscillation, which enables the output of the high frequency DC, is
employed in the arc-starting system. The features of this product are as following: stable output,
reliable, completely portable, efficient and low noise generated while welding is performed.
-TIG welding is available for EasyTig 160S/200S.
Both MMA and TIG are welding are available for EasyTig 180A/200A/200ADS/200P and WS 00/WS
400/WSM 00/WSM 400.
TIG 160S, TIG 200S, TIG 180A, TIG 200A and TIG 200ADS are models of registered design plastic
products, the cover of which are made of anti-combustible ABS material. It possesses more
advantages compared to machines of iron case, such as beautiful design, excellent insulation, and
waterproof.
During the performance of MMA welding, this welding machine is featured with the stability of
output, and the availability of arc force modulation. In case of normal arc input voltage, the
stability of welding current output is not frustrated with variation of arc length therefore it results in
stable performance of welding operation, of which the arc is of elasticity. In case of unavailable
length of arc and low input voltage, welding output current increases while arc voltage decreases,
as a consequence, the length of arc, which is not sufficient, will automatically compensate and the
modulation of arc force is accessible. In case that the input arc voltage is too low to maintain arc,
the output of this welding equipment descends steeply which avoid the splash generated due to
over current input. During the performance of TIG welding, this welding equipment is featured with
the stability of output current and that the welding current output does not vary with variation of
the length of arc. In case of short circuit of electrode, the voltage automatically decreases to OV,
which limits the impairment of electrode and pollution to environment.
Guarantee of maintenance for main engine is one year, excluding other spare parts.
During the guarantee maintenance period, all maintenance is free of charge, excluding the
deliberated damage to this welding equipment.
Only qualified technician are authorized to carry out the repairs task of this welding machine in
case of machine fault.
Bloc Diagram

5
MAIN PARAMETER
Type EasyTig
160S
EasyTig
200S
EasyTig
180A
EasyTig
200A/200
ADS
TIG200P
Input volt (V) Single Phase AC22OV±15%
Frequency (Hz) 50/60 50/60 50/60 50/60 50/60
Input current (A) 15 21 18 21 18
No-load volt (V) 4 4 60 60 54
Output current (A) 10~160 10~200 10~180 10~200 10~200
Rated Input (KVA) .2 4.5 4.5 4.5 4.5
Post-flow Time (S) , 8 , 8 , 8 , 8 1~5
Valley-down current ---- ---- ---- 18-162A(2
00ADS)
----
Duty cycle 60% 60% 60% 60% 60%
No-load loss (W) 5 5 40 40 40
Arc-starting HF HF HF HF HF
Efficiency 85% 85% 85% 85% 85%
Power factor 0.9 0.9 0.9 0.9 0.9
Insulation class B B B B B
Protection class IP2 IP2 IP2 IP2 IP21
Weight (kg) 7 7 7 7 15
Dimension (mm) 95x16 x290
95x16 x290 95x16 x290 95x16 x290 425x205x 55
Circuit diagram (Single phase input)

6
MAIN PARAMETER
Type WS 300 WS 400 WSM 300 WSM 400
Input voltage (V) phase AC 80V±15%
Frequency (Hz) 50/60 50/60 50/60 50/60
Rated Input (KVA) 8. 1 12 1
No-load voltage (V) 54 64 55 60
Peak current (A) 10~ 00 10~400 10~ 00 10~400
Valley current (A) - - 10~ 00 10~400
Up Slope (S) - - 0~10 0~10
Down Slope (S) - - 0~10 0~10
Pulse Frequency (Hz) - - 25~250 25~250
Post-flow time (S) 1~10 1~10 1~10 1~10
Rated voltage (V) 22 22.6 22 22.6
Duty cycle 60% 60% 60% 60%
No-load loss (W) 40 80 40 80
Arc-starting HF HF HF HF
Efficiency 85% 85% 85% 85%
Power factor 0.9 0.9 0.9 0.9
Insulation class F F F F
Protection class IP21 IP21 IP21 IP21
Weight (kg) 2 2 2 2
Dimension (mm) 500x26 x421 562x 0 x467 500x26 x421 562x 0 x467
Circuit diagram (Three phase input)

7
INSTALLTION & OPERATION
It is important to note that any extension of mains cables or torch cables will
possibly affect the welding performance of this welding equipment, due to the fact
that the resistance of the cable will reduce input voltage, which is decided by the
length of the cable. The assembled length of main cables and torch cables is
recommended.
1
9
8
4
7
3
2
a
2
a
2b
2b
2c
‘
+
’
2c
‘
+
’
9
4
15
18
5
1
6
17
6
Easytig 200P
0A/
Easytig 200ADS with
2T/2T Function
1
4
‘
-
’
‘
-
’
1
3
1
1
2
a
2
a
2
c
2
c
/
‘
+
’
11
6
11
6
5
17
17
4
Easytig 160S/ 200S
0A/
Easytig 180A/ 200A
2
b
‘ - ’
2
b
5
10
11

8
GENERAL
1. Connection of Input cables
1.1 Primary cable is available for this welding equipment. Connect the primary
cable with power supply of required input voltage.
Please note:
Input voltage for EasyTig 160S, 200S, 180A, 200A, 200ADS, 200P is of
220V and single phase.
Input voltage for WS 00/ WS 400/ WSM 00/ WSM 400 is of 80V and
three phase.
1.2 The input cable should be well connected with the power supply switch or
the cable oxidization. Check with multi-meter whether the input voltage
varies in the given range, during the performance of welding. Please refer
to “main parameter”
2. Connection of Output Cables
2.1 TIG Welding Equipment: (Available for EasyTig 160S, 200S)
a. Plug the torch into the one-knob connector, and fasten the screw in clockwise
direction.
b. Connect pilot-plug of the torch into the pilot-socket on the panel board, and
fasten the screw.
c. Plug the fast-plug of earth clamp to the socket on the panel board, and
fasten it in the clockwise direction. Connect earth clamp with work piece.
Gas supply: At the back of the machine connect the gas tube to the copper
nozzle. The gas supply system, which includes a gas bottle, an air regulator and
a gas hose, should be well connected in order to keep gas output, which is of
critical importance for TIG welding operation. Connect earth cable with earth
terminal of this welding equipment to prevent possible occurrence of static
electricity and electric leakage.
‘
-
’
6
2
b
2
a
12
2
c
/
‘
+
’
2
b
‘
-
’
2
c
/
‘
+
’
2
a
1
1
7
5
19
17
4
4
18
14
7
17
6
8
15
19
11
1
6
13
WS300/ WS400
WSM300/ WSM400
4

9
2.2 MMA & TIG welding equipment : (Available for EasyTig 180A, 200A,
200ADS, 200P, WS 300, WS 400, WSM 300, WSM 400)
‘-’. Connect Torch welding cable into the fast-plug socket.
a. Connect Torch Gas hose fitting into the connection point on the panel
board.
b. Connect pilot-plug of the torch into the pilot-socket on the panel board,
and fasten the screw
c. Connect the fast-plug of earth clamp to the socket on the panel board, and
fasten it in the clockwise direction. Connect earth clamp with work piece.
d. For the MMA welding connection:
Connect the terminal of electrode-holder to plug ‘+’ and connect the
terminal of earth clamp to plug ‘-’. Possible damage to plug and socket
occurs due to the incorrect operation, over current output or excessively
long period of welding operation.
Please pay attention to the connection of the poles. Two modes of connection for
MMA welding are available: Positive connection and negative connection.
- Positive connection mode is generally available with acid welding rod.
Connect work piece to ‘+’ and electrode holder to ‘-’
- Negative connection mode is generally available with stainless steel, fiber
materials rod. Connect work piece to ‘-’, and electrode to ‘+’.
OPERATION
3. Power Supply Switch
In case that power switch is on, the built-in fan is functioning or the current
meter displays the current value.
4. Function Switch
Function switch enables the option between MMA and TIG welding according to
practical welding task requirement.
4a. TIG Instruction:
- Opt with TIG mode.
- Release gas and set parameters of required volume of gas output.
- The built-in fan functions. Press the button of welding torch, electromagnetic
valve functions and electricity is releasing, and there is gas output.
- According to the thickness of work piece, modulate welding current output.
- The distance between the tungsten and the work piece should be limited in the
range of 2-4mm. Press the torch button, arc starts, and welding operation is
accessible.
4b.MMA Instruction: (Available for EasyTig 180A/ 200A/ 200ADS/ 200P/
WS 300/ WS 400/ WSM 300/ WSM 400)
- Opt with MMA welding mode
- Modulate current output according to the thickness of work piece
- Modulate Arc force according to practical application (only available for WS 00 &
WS 400); Arc force is available for the improvement of welding performance
particularly in case of low input current.
5. Welding Current Adjust
- In case of option of MMA welding mode, “pulse exchange “and “down-slope
“ are unavailable.
- Modulating welding output current according to the thickness of the work piece.
6. Pilot lamp

10
Pilot lamp is on, in case that this welding equipment is of overheating protection
status. Overheating arises if this welding equipment is overloaded. This welding
equipment automatically restarts when the temperature inside of this welding
equipment has fallen, and pilot lamp is off.
7. Current meter (Only available for EasyTig 200P, WS 300, WS 400, WSM
300, WSM 400)
The digital meter displays the welding current.
8. Pulse Switch (Only available for WSM 300 & WSM 400)
8.1 Opt TIG welding mode.
8.2 Modulate “pulse exchange”, no pulse mode at “MIDDLE”, medium pulse
frequency mode at” UP” (for parameter of frequency please refer to Main
Parameter), and low pulse frequency mode at “DOWN”
8. Press down control button of welding torch, the electric valve functions,
there is electric release, and there is gas output from the nozzle.
9. (2T/4T) Switch (Optional)
In “2T” mode, for the first time press the button of welding torch, there is
welding current output. Second time, no welding current output; in “4T” mode,
for first and second time, there is welding current output, for the third time there
is not welding output current.
10. Slope-down Time Adjust
The adjustable range of slope-down time is from 0 to 10 seconds.
11. Gas post-flow
The gas post-flow time is the period from extinction of arc to the interruption of
the gas supply. The time can be adjusted from 1—10 seconds to avoid possible
oxidation of tungsten electrode.
12. Arc Force Current
Arc Force improves the performance of arc starting.
13. Pulse Frequency Adjust (See the following curve of current)
14. Valley Current Adjust (Peak or valley current are not available in MMA
welding mode)
Modulate volley value as practical application required.
15. Pea Current Adjust
Modulate peak current as practical application required.
16. Pulse Width Adjust
17. Power Lamp
Green light lamp is on when power is on.
18. Arc Start Current
19. Arc End Current
Push
Releas
e
Push
Release

11
SPEED-READ TABLE
Parameter for Stainless Plate TIG Welding (for reference only)
Plate
Thickness(
mm)
Connector Tungsten
Diameter
(mm)
Wire
Diameter
(mm)
Current Type Welding
Current
Gas Volume
(L/min)
Welding
speed
(cm/min)
1.0 Butt Joint 2 1.6 DC positive 7~28 ~4 12~47
1.2 Butt Joint 2 1.6 DC positive 15 ~4 25
1.5 Butt Joint 2 1.6 DC positive 5~19 ~4 8~ 2
Parameter for Titanium and its Alloy TIG Welding (for reference only)
Plate
thickness
(mm)
Slope
shape
Welding
Layers
Tungsten
Diameter
(mm)
Wire
Diameter
(mm)
Welding
Current
Gas Volume (L/min) Nozzle
Diamet
er
0.5 1 1.5 1.0 0~50 8~10 6~8 14~16 10
1.0 1 2.0 1.0~2.0 40~60 8~10 6~8 14~16 10
1.5 1 2.0 1.0~2.0 60~80 10~12 8~10 14~16 10~12
2.0 1 2.0~ .0 1.0~2.0 80~110 12~14 10~12 16~20 12~14
2.5
I-Shape
d
1 2.0~ .0 2.0 110~120 12~14 10~12 16~20 12~14
.0 1~2 .0 2.0~ .0 120~140 12~14 10~12 16~20 14~18
4.0 2 .0~4.0 2.0~ .0 1 0~150 14~16 12~14 20~25 18~20
5.0 2~ 4.0 .0 1 0~150 14~16 12~14 20~25 18~20
6.0 2~ 4.0 .0~4.0 140~180 14~16 12~14 25~28 18~20
7.0 2~ 4.0 .0~4.0 140~180 14~16 12~14 25~28 20~22
8.0
Y-Shap
ed
~4 4.0 .0~4.0 140~180 14~16 12~14 25~28 20~22
10 4~6 4.0 .0~4.0 160~200 14~16 12~14 25~28 20~22
20 12 4.0 4.0 200~240 12~14 10~12 20 18
22 12 4.0 4.0~5.0 2 0~250 15~18 18~20 18~20 20
25 15~16 4.0. .0~4.0 200~220 16~18 20~26 26~ 0 22
0
Double
Y-Shap
ed
17`18 4.0 .0~4.0 200~220 16~18 20~26 26~ 0 22
Parameter for Stainless Pulse TIG Welding (for reference only)
Current (A) Duration Time (S) Plate
thickness
(mm)
Pulse Base
Value
Pulse Base
Value
Pulse
Frequency
(Hz)
Welding
Speed
(cm/min)
0. 20~22 5~8 0.06~0.08 0.06 8 50~60
0.5 55~60 10 0.08 0.06 7 55~60
0.8 85 10 0.12 0.06 5 80~100
CAUTIONS
Possible threaten to the safety, and even life of operator and people in
or near wor ing area, and damage to this welding equipment occurs, in
case of any disconnection of cable and plug during the welding
operation.

12
Parameter for Aluminum and its Alloy TIG Welding (for reference only)
Plate
thickness
(mm)
Slope
shape
Welding
Layers
Tungsten
Diameter
(mm)
Wire
Diameter
(mm)
Pre-Tempe
rature (C)
Welding
Current
Gas
Volume
(L/min)
Nozzle
Diamet
er
1.5 1/0 2 1.6~2.0 - 50~80 7~9 8
2
I-Shape
d 1/0 2~ 2~2.5 - 50~80 8~12 8~12
1/0 2~ - 150~180 8~12 8
4 1~2/1 4 - 180~200 10~15 8~12
5 1~2/1 4 ~4 - 180~240 10~15 8~12
8 2/1 5 4~5 100 260~ 20 16~20 10~12
10 ~4/1~2 5 4~5 100~150 280~ 40 16~20 14~16
12 ~4/1~2 5~6 4~5 150~200 00~ 60 18~22 14~16
16 4~5/1~2 6 5~6 200~220 40~ 80 20~24 16€20
20
Y-Shap
ed
4~5/1~2 6 5~6 200~260 60~400 25~ 0 20~22
16~20 2~ /2~ 6 5~6 200~260 00~ 80 25~ 0 16~20
22~25
Double
Y-Shap
ed
2~ /2~ 6~7 5~6 200~260 60~400 0~ 5 20~22
PROBLEMS POSSIBLY OCCUR
The phenomena following listed possibly occur due to the factors, such as spare
parts, input gas, environment, and power supply. Thus necessary measures should
be taken to avoid the following listed occurrences
-Blac Welding Point
The occurrence of black welding point should possibly occur due the failure of
protective gas output. The failure of protective gas output may be due to the
following factors: sufficiency of gas pressure, impurity of gas source, and
ventilation condition.
Compensate the gas output failure.
-Difficult in Arc-starting and to halt frequently
In case of unqualified tungsten, the performance of electricity releasing is
affected.
With the un-peaked tungsten terminal, it is difficult in arc starting and unstable
of current output.
-Unstable Welding Current during the welding operation.
The possible causation may include the unstable input voltage and the
disturbance of electromagnetic noise of other electric equipment

13
CAUTIONS
1. Wor ing Environment
1.1The location in which this welding equipment is installed should be of little
dust, corrosive chemical gas, flammable gas or materials etc, and of
maximum 80% humidity;
1.2Avoid the operation of welding in the open air unless the working area
sheltered from the sun shining, rain water and snow etc; the temperature of
working environment should be maintained within -10°C to +40°C;
1. The minimum distance of this welding equipment and wall should be 0cm.
1.4 Keep the working environment in good ventilation.
2. Safety Tips
2.1 Ventilation
This welding equipment is small-sized, compact in structure and of excellent
performance in current output. Fans are to abstract heat generated by this
welding equipment while the operation of welding is carried out.
Cautions: Maintain good ventilation of the louvers of this welding equipment.
The minimum distance between this welding equipment and any other
objects in or near the working area should be 0 cm. Good ventilation is of
critical importance for the normal performance and service life of this welding
equipment.
2.2 Welding operation is forbid while this welding equipment is of over-load.
A sudden halt may occur while the welding operation is carried out while this
welding machine is of over-load status. Under this circumstance, it is
unnecessary to restart this welding equipment. Keeps the built-in fan working
to bring down the temperature inside this welding equipment.
2. Over-voltage is forbid.
Regarding the power supply voltage range of the welding machine, please
refer to “Main parameter” table. This welding equipment is of automatic
voltage compensation, which enables the maintaining of the voltage range
within the given range. In case that the input voltage exceeds the stipulated
value, it is possibly damaging to the components of this welding equipment.
2.4 An earth terminal available for this welding equipment. Connect with the
earth cable to avoid the static and electric shock.
2.5 It is strongly forbid to contact the output terminal when the welding
operation is performed. An electric shock possibly occurs.
MAINTENANCE
Exposure to extremely dusty, damp, or corrosive air is damaging to the welding
machine. In order to prevent any possible failure or fault of this welding equipment,
clean the dust at regular intervals with clean and dry compressed air of required
pressure.
Please note that: lack of maintenance can spell to the unavailability and
cancellation of the guarantee; the guarantee of this welding equipment will be no
longer available in case that it has been attempted to take the machine apart or
open the factory-made sealing of the machine.

14
TROUBLESHOOTING
CAUTIONS: Only the qualified technicians are authorized to undertake the repair
task of this welding equipment in case of machine fault
.
EasyTig 160S, 200S, 180A, 200A, 200AD, 200P
Fault Symptoms Rectification
1. While this
welding
equipment is
operated; the
pilot lamp is
off, no output,
the built-in fan
unavailable.
1. Possible function failure of power switch. Compensate it
if necessary.
2. Possible unavailability of input. Compensate it if
necessary.
. Possible short circuit of input cable, Compensate it if
necessary.
2. While this
welding
equipment is
operated , the
pilot lamp is
on, no output,
the built-in fan
unavailable.
1. Possible misconnection with input of 80V, and
occurrence of over voltage protection status. Reconnect
with input of 220V, and restart.
2. Possible unstable input due to the un-available input
cable or possible connection unavailable spells it’s being
of over-voltage protection status.
. Frequently switching on and off of this welding
equipment in a short period leads this equipments being
of over-voltage protection. Switch off this welding
machine and wait for at least minutes, then restart
this welding equipment.
4. Possible unavailability of the connection of switch and
bottom board. Reconnect it.
5. The 24 V relay of bottom PCB is possibly damaged.
Replace it if necessary.
. While this
welding
equipment is
operated, the
built-in fan
functions, the
fault indicator
is off, no HF
electricity
releasing, arc
starting
unavailable.
1. The normal voltage of positive and negative pole of
board VH-07 should be DC 08V.
1.1Possible short circuit occurs, and possible
unavailability of connection of silicon bridge with the
PCB.
1.2 Possible electricity leakage of capacitors, replace
them if necessary.
2. A green light indicator of secondary power supply of top
PCB should be on. Otherwise, it indicates that the
secondary power supply is not functioning. Check the
connection whether is available. If fault cannot be
rectified, please contact the supplier for further advice.
. Possible unavailability of connection inside this welding
equipment occurs. Check and reconnect if necessary.
4. Possible malfunction of control circuit occurs. Check
otherwise contact the supplier for further advice.
5. Possible damage of the welding torch. Replace it if
necessary.

15
Fault Symptoms Rectification
4. While this
welding
equipment
is operated,
fault indicator
is off, HF
electricity
releasing is
available, and
welding current
output is
unavailable.
1. Possible disconnection of welding torch cable.
2.
Possible disconnection of earth cable, or unavailability of
connection of the earth cable and work piece.
. The connection between positive output terminal or the
gas or electricity output terminal and this welding
equipment is possibly unavailable. Reconnect them if
necessary.
5. While is this
welding
equipment is
operated, the
fault indicator
is off, no
electricity
releasing, and
the arc starting
available.
1. The cable connection between the transformer of arc
starting and power PCB is possibly unavailable. Check
and reconnect it.
2. Possible oxidization of electricity releasing parts occurs.
Or the distance is larger than the maximum distance
available. Remove the oxidization of the electricity
releasing parts and adjust the distance of the electricity
releasing parts to range of 1mm.
. Possible damage to MMA/TIG switch. Replace them if
necessary.
4. Components of HF arc starting circuit are possibly
damaged. Check and replace them if necessary.
6. While this
welding
equipment is
operated, fault
indicator is on,
and there is no
output.
1. It is possible of over-current protection status. Switch
off the power supply, wait till the fault indicator is off,
and restart this welding equipment.
2. It is possible of over-heating protection status. Wait till
the fault indicator is off, and the welding operation will
be available.
. Possible fault with Inverter circuit. Disconnect the power
supply plug (VH-07) of transformer of MOS PCB. And
restart this welding equipment.
.1 If the fault indicator is still on. Turn off the power
supply of this welding equipment. Disconnect the
power supply plug (VH-0 ) of HF arc starting.
.1.1
If the fault indicator is on, MOFESTS of top PCB is
possibly defective. Replace it, if necessary.
.1.2 Possible damage of transformer of center PCB.
Replace it if necessary.
.2 If the fault indicator is off.
.2.1 Possible damage of transformer of center PCB.
Replace it if necessary. Measure the inductance
value and Q value. L=0.9-1 .6mH Q> 5. If both
of the inductance value and Q value are
comparatively low, replace them.
.2.2 Possible damage of secondary rectifier of
transformer. Replace it if necessary.
4. Possible damage of feed back circuit. Replace it if
necessary.

16
Fault Symptoms Rectification
7. Unstable
current output
during the
welding
operation and
the
potentiometer
is unavailable.
1. Possible damage of 1K resistance. Replace it if
necessary.
2. The connection of this welding equipment is not
available.
8. Excessive plash
generated
during welding
operation. It is
difficult to weld
with alkaline
rod.
1. Misconnection of earth cable and welding torch cable.
2. Reconnect them.

17
WS 300/ WS 400/ WSM 300/ WSM 400
Fault Symptoms
Rectification
1. While this
welding
equipment is
operated, the
built-in fan is
not
functioning. No
display of
digital meter,
no welding
output.
1. Possible failure of connection of power supply, check and
reconnect if necessary.
2. If power supply is available of input, possible damage of
four thermal resistance. Check and replace them if
necessary.
. Possible malfunction of power PCB.
.1 Possible damage of Rectifier Bridge.
.2 Power PCB is damaged.
. Check connection of input.
4. Possible failure of secondary power supply. Please
contact dealer or supplier for further advice.
2. While this
welding
equipment is
operated, the
built-in fan
functions, fault
indicator is off,
no HF
electricity
releasing, arc
starting
unavailable.
1. Check all the connections inside the machine.
2. Something wrong with the control circuit, find out the
reason and contact the manufacture.
. The control cable on the torch is broken.
. While this
welding
equipment is
operated, fault
indicator is off,
HF electricity
releasing is
available, and
welding current
output is
unavailable.
1. Possible disconnection of welding torch cable.
2. Possible disconnection of earth cable, or unavailability of
connection of the earth cable and work piece.
. The connection between positive output terminal or the
gas or electricity output terminal and this welding
equipment is possibly unavailable. Reconnect them if
necessary.
4. While this
welding
equipment is
operated, the
fault indicator
is off, no
electricity
releasing, and
the arc starting
available.
1. The cable connection between the transformer of arc
starting and power PCB is possibly unavailable. Check
and reconnect it.
2. Possible oxidization of electricity releasing parts occurs.
Or the distance is larger than the maximum distance
available. Remove the oxidization of the electricity
releasing parts and adjust the distance of the electricity
releasing parts to range of 1mm.
. Possible damage to MMA/TIG switch. Replace them if
necessary.
4. Components of HF arc starting circuit are possibly
damaged. Check and replace them if necessary.

18
Fault Symptoms
Rectification
5. While this
welding
equipment is
operated, the
fault indicator
is on, and
there is no
output.
1. It is possible of over-current protection status. Switch off
the power supply, wait till the fault indicator is off, and
restart this welding equipment.
2. It is possible of over-heating protection status. Wait till
the fault indicator is off, and the welding operation will
be available.
. Possible fault with Inverter or HF arc starting PCB.
Disconnect the power supply plug (VH-
07) of transformer
of Inverter. And restart this welding equipment. The
same measure should be taken in order to locate the
fault for the welding equipment of one Inverter or two
Inverters.
a) If the fault indicator is still on. Switch off the
power supply of this welding equipment.
Disconnect the power supply plug (VH-0 ) of HF
arc starting.
i. If the fault indicator is on, MOFESTS of top
PCB is possibly defective. Replace it, if
necessary.
ii. If the fault indicator is off, possible damage of
transformer of arc starting PCB. Replace it if
necessary.
b) Reconnect the power supply of Inverter of fault.
Disconnect the
power supply of main transformer,
and restart this welding equipment.
i.
In case that the fault indicator is off, it can be
concluded that
there is possible fault of
transformer of middle PCB.
Possible damage of
transformer of middle PCB. Replace it if
necessary. Measure th
e inductance value and Q
value.
ii. Possible damage of secondary rectifier of
transformer. Replace it if necessary.
4. Possible damage of feed back circuit. Replace it if
necessary.
6. Insufficient
current output
during the
welding
operation and
the variable
resistance is
unavailable.
1. The length or thickness of secondary cables is not
available.
2. This welding equipment is of remote control mode.
. Possible damage of variable resistance. Replace it.