Stealth DIGI-ARC140ST DV User manual

IGBT INVERTER • DC MMA / LIFT TIG • WELDING MACHINE
Part No. 9020
DIGI-ARC140ST DV
OPERATING
INSTRUCTIONS
Suitable for
110V or 240V

SAFETY PRECAUTIONS
Follow these precautions carefully. Improper use of any welder can result in injury or death.
1. ONLY CONNECT MACHINE TO A POWER SOURCE FOR WHICH IT WAS DESIGNED.
THE SPECIFICATION PLATE ON THE MACHINE LISTS THIS INFORMATION. WHEN
WELDING OUTDOORS ONLY USE AN EXTENSION CORD INTENDED FOR SUCH USE.
2. ONLY OPERATE MACHINE IN DRY LOCATIONS AND ON CEMENT OR MASONRY FLOOR.
KEEP AREA CLEAN AND UNCLUTTERED.
3. KEEP ALL COMBUSTIBLES AWAY FROM WORK SITE.
4. DO NOT WEAR CLOTHING THAT HAS BEEN CONTAMINATED WITH GREASE OR OIL.
5. KEEP CABLES DRY AND FREE FROM OIL AND GREASE AND NEVER COIL AROUND
SHOULDERS.
6. SECURE WORK WITH CLAMPS OR OTHER MEANS – DON’T OVER-REACH WHEN
WORKING.
7. NEVER STRIKE AN ARC OVER A COMPRESSED GAS CYLINDER.
8. DON’T ALLOW THE INSULATED PORTION OF THE ELECTRODE HOLDER TO TOUCH
THE GROUND WHILE CURRENT IS FLOWING.
9. SHUT OFF POWER AND UNPLUG MACHINE WHEN REPAIRING OR ADJUSTING.
INSPECT BEFORE EVERY USE. ONLY USE IDENTICAL REPLACEMENT PARTS.
10. FOLLOW ALL MANUFACTURER’S RULES ON OPERATING SWITCHES AND MAKING
ADJUSTMENTS.
11. ALWAYS WEAR PROTECTIVE CLOTHING WHEN WELDING. THIS INCLUDES: LONG
SLEEVED SHIRT (LEATHER SLEEVES), PROTECTIVE APRON WITHOUT POCKETS, LONG
PROTECTIVE TROUSERS, BOOTS AND GLOVES WHEN HANDLING HOT MATERIALS.
12. ALWAYS WEAR A WELDER’S HELMET WITH PROTECTIVE EYE PIECE WHEN WELDING.
WEAR A PROTECTIVE CAP UNDERNEATH THE HELMET.
13. WHEN WELDING OVERHEAD, BEWARE OF HOT METAL DROPPINGS. ALWAYS PROTECT
THE HEAD, HAND, FEET AND BODY.
14. KEEP A FIRE EXTINGUISHER CLOSE BY AT ALL TIMES.
15. DO NOT EXCEED THE DUTY CYCLE OF THE MACHINE. THE RATED CYCLE OF A
WELDING MACHINE IS THE PERCENTAGE OF A TEN MINUTE PERIOD THAT THE
MACHINE CAN OPERATE SAFELY AT A GIVEN OUTPUT SETTING.
16. KEEP ALL CHILDREN AWAY FROM WORK AREA. WHEN STORING EQUIPMENT, MAKE
SURE IT IS OUT OF REACH OF CHILDREN.
17. GUARD AGAINST ELECTRIC SHOCK. DO NOT WORK WHEN TIRED. DO NOT LET BODY
COME IN CONTACT WITH GROUNDED SURFACES.
STEALTH DIGI-ARC140ST DV

Power Supply Voltage
No-load Voltage
Current Adjusting Range
Rated Output Current
Rated Duty Cycle
Weight
MMA
Protection Class of Enclosure
MODEL: DIGI-ARC140ST DV
1 MAIN USE AND RANGE
STEALTH DIGI-ARC140ST DV inverse arc machine is a welding machine incorporating
IGBT and features performance and high efficiency. The welding current is infinitely and
independently adjustable. All ferrous metal, copper and stainless steel material can be
omni-bearing welded in all positions. The machine has outstanding feature of minimum
welding current – up to 15A. Protection measures of the welder are excellent. The machine
is reliable,light weight and easy to use. It is particularly suitable for plant and mine, build,
decoration and maintenance sectors.
2 OPERATING CONDITION AND WORK SURROUNDING
2.1 OPERATING CONDITIONS
Voltage of power source: single phase, AC 110V or 240 V ± 10%
Frequency: 50/60Hz
Reliable grounding protection
2.2 WORK SURROUNDINGS
2.2.1 Relative humidity: ≤90% (average monthly temperature ≤20ºC)
2.2.2 Ambient temperature: –10ºC - 40ºC
2.2.3 The welding site should have no harmful gas, chemicals, moulds and
inflammable matter, explosive and corrosive medium.
2.2.4 Operating in rain is not allowed.
3 TECHNICAL SPECIFICATIONS
STEALTH DIGI-ARC140ST DV
1 x AC110V~50/60Hz
70V
35%
4.5kg
IP21S
15-80A
80A
15-140A
140A
1 x AC110V~50/60Hz

STEALTH DIGI-ARC140ST DV
4 PRODUCT DESCRIPTION
• Before welding, the operator should read the operating instructions.
•Check the machine appearance for deformation and damage.
•For the safety of the equipment the operator must make an appropriate earth according
to the power supply system.
•The welding operation should be carried out in a dry and well ventilated area.
•Check the machine output connection.
•The machine should not be moved or the cover opened when the power is on and
during the welding operation.
•The machine should be maintained, operated and managed by a qualified person.
•Confirm the power source is single phase and 110V or 240V ± 10% and distribution
board current is 5KVA.
•DO NOT connect with 380V power.
5 PANEL FUNCTION DIAGRAMS
FRONT PANEL BACK PANEL
1. Power switch
2. MMA/TIG switch
3. Protect indicating light
4. Current regulator
5. Output +
6. Output –
7. Current indicator
8. Cooling Fan
9. Incoming line of the power
10. Safety earthing column
connect the protection grounding of the welder.
d. Welding operation should be carried out in dry and good ventilating area. The
surrounding objects should be not less than 0.5m away from the welder.
e. Checking the welder output connector for tightness.
f. The welder can not be moved or the cover can not be opened during the power
is on and welding operation is carried out.
g. The welder should be cared,used and managed by specialized person.
±
h. Confirming that the power source is single phase and 110V or 240V 10%. Current
of the distribution board: 5KVA .
It can not be connected with 380V power absolutely.
5. SKETCH OF THE PANEL FUNCTION
FRONT PANEL BACK PANEL
1. power switch 2. MMA/TIG switch 3. protect indicating light
4. current regulator 5. output"+" 6. output"-"
7. indication of current 8. fan 9.incoming line of the power
10.safety earthing column
6.METHOD OF THE OPERATION
6-1. hand welding with electrode(MMA)
①
.Put switch"2" (MMA/TIG switch) onto the position "MMA".
Selecting empiric formula: I=40*d ,d is dia. of the electrode.
②Notice positive and negative connection during welding.
A negative connection B positive connection
8
19
7
+
-
●
2
3
4
5
6
+
-
HOLDER
WORKPIECE
+
-
HOLDER
WORKPIECE
10

STEALTH DIGI-ARC140ST DV
6 MACHINE OPERATION
6.1 HAND WELDING WITH ELECTRODE (MMA)
6.1.1 Put switch 2(MMA/TIG switch) to position MMA.
6.1.2 Select empiric formula: I = 40*d, d is diameter of the electrode.
6.1.3 Note positive and negative connection during welding.
A – Negative connection B – Positive connection
connect the protection grounding of the welder.
d. Welding operation should be carried out in dry and good ventilating area. The
surrounding objects should be not less than 0.5m away from the welder.
e. Checking the welder output connector for tightness.
f. The welder can not be moved or the cover can not be opened during the power
is on and welding operation is carried out.
g. The welder should be cared,used and managed by specialized person.
±
h. Confirming that the power source is single phase and 110V or 240V 10%. Current
of the distribution board: 5KVA .
It can not be connected with 380V power absolutely.
5. SKETCH OF THE PANEL FUNCTION
FRONT PANEL BACK PANEL
1. power switch 2. MMA/TIG switch 3. protect indicating light
4. current regulator 5. output"+" 6. output"-"
7. indication of current 8. fan 9.incoming line of the power
10.safety earthing column
6.METHOD OF THE OPERATION
6-1. hand welding with electrode(MMA)
①
.Put switch"2" (MMA/TIG switch) onto the position "MMA".
Selecting empiric formula: I=40*d ,d is dia. of the electrode.
②Notice positive and negative connection during welding.
A negative connection B positive connection
8
19
7
+
-
●
2
3
4
5
6
+
-
HOLDER
WORKPIECE
+
-
HOLDER
WORKPIECE
10
6.2 DC ARGON ARC WELDING (LIFT TIG)
6.2.1 Put switch 2(MMA/TIG switch) onto the position TIG.
6.2.2 Connect gas inlet pipe of the welding torch to argon bottle.
6.2.3 Test gas: open the argon bottle switch and switch on the flow meter, select
suitable argon flow.
6.2.4 Regulating the current knob 4. Select suitable welding current according
to thickness of the workpiece to be welded.
6.2.5 When the welding operation is finished, turn off argon bottle switch and cut off
input power of the welder.
7. SYSTEMATIC BLOCK DIAGRAM
8. TROUBLES AND PROBLEM SOLVING
+
Input
Rectifier
&Filter
Inverse
Circuit
55KHz
output
Rectifier
&Filter
single
phase
AC INPUT -
Control Circuit
trouble causes problem solving
power lamp is not lit 1. No electricity at input
2. switch of welder power fails
1. Checking incoming line
2. Replace the switch
Fan not rotating
1. Fan power line is off
2. Enclosure blocks the fan
due to deformation
3.The fan fails
4. Welder fails
1. Reconnect the line
2. reform the enclosure
3. replace
4. Maintenance in manufactu
rer or service center
Warning lamp lights
No output of welder
1. Overheat protection
2. Short interval of welder
switching on and off
3. Short between output + and
output - or Welding electrode
sticking on the workpiece
4.Welder fails
1. Welding after cools
2. Extending on-off time
3. move electrode
4.Maintenance in manufactur
er or service center
Output current
decreased
1. Input voltage is low
2. Input line is too thin
1. AC voltage
stabilizer(over 5KVA)
2. Power line is thickened
Current can not be
regulated
1. Connecting line of the
potentiometer is off
2. Potentiometer for current
regulation fails
1. Reconnecting the line
2. Replace potentiometer
7 SYSTEMATIC DIAGRAM

STEALTH DIGI-ARC140ST DV
Problems Causes Solutions
Power lamp not lit 1. No electricity input 1. Check incoming line
2. Machine switch fails 2. Replace switch
Fan not rotating 1. Fan power line is off 1. Reconnect the line
2. Fan enclosure is blocked 2. Unblock the enclosure
3. Fan fails 3. Replace the fan
4. Machine fails 4. Return to manufacturer or
service centre
Warning lamp lights 1. Over heat (yellow lamp lights) 1. Welding after cooling
2. Over current (Green lamp lights) 2. Input voltage too low or the
machine fails
No output of welder 1. Over current protection 1. Over load using
2. Welder fails 2. Maintenance in manufacturer
or service centre
Output current 1. Input voltage is low 1. Stabilise over 5KVA
decreased 2. Input line is too thin 2. Thicken power line
Current cannot be 1. Connecting line of the 1. Reconnect the line
regulated potentiometer is off
2. Potentiometer for current 2. Replace potentiometer
regulation fails
TROUBLESHOOTING

STEALTH DIGI-ARC140ST DV
WARNING
AVISO DE
PRECAUCION
ATTENTION
WARNUNG
ATENÇÃO
Spanish
French
German
Portuguese
Japanese
Chinese
Korean
Arabic
READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BE
USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.
SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS
CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.
LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A
ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.
LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HER-
STELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.
●Do not touch electrically live parts or
electrode with skin or wet clothing.
●Insulate yourself from work and
ground.
●No toque las partes o los electrodos
bajo carga con la piel o ropa moja-
da.
●Aislese del trabajo y de la tierra.
●Ne laissez ni la peau ni des vête-
ments mouillés entrer en contact
avec des pièces sous tension.
●Isolez-vous du travail et de la terre.
●Berühren Sie keine stromführenden
Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!
●Isolieren Sie sich von den
Elektroden und dem Erdboden!
●Não toque partes elétricas e elec-
trodos com a pele ou roupa molha-
da.
●Isole-se da peça e terra.
●Keep flammable materials away.
●Mantenga el material combustible
fuera del área de trabajo.
●Gardez à l’écart de tout matériel
inflammable.
●Entfernen Sie brennbarres Material!
●Mantenha inflamáveis bem guarda-
dos.
●Wear eye, ear and body protection.
●Protéjase los ojos, los oídos y el
cuerpo.
●Protégez vos yeux, vos oreilles et
votre corps.
●Tragen Sie Augen-, Ohren- und Kör-
perschutz!
●Use proteção para a vista, ouvido e
corpo.

STEALTH DIGI-ARC140ST DV
WARNING
AVISO DE
PRECAUCION
ATTENTION
WARNUNG
ATENÇÃO
Spanish
French
German
Portuguese
Japanese
Chinese
Korean
Arabic
LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS
PRÁTICAS DE SEGURANÇA DO EMPREGADOR.
●Keep your head out of fumes.
●Use ventilation or exhaust to
remove fumes from breathing zone.
●Los humos fuera de la zona de res-
piración.
●Mantenga la cabeza fuera de los
humos. Utilice ventilación o
aspiración para gases.
●Gardez la tête à l’écart des fumées.
●Utilisez un ventilateur ou un aspira-
teur pour ôter les fumées des zones
de travail.
●Vermeiden Sie das Einatmen von
Schweibrauch!
●Sorgen Sie für gute Be- und
Entlüftung des Arbeitsplatzes!
●Mantenha seu rosto da fumaça.
●Use ventilação e exhaustão para
remover fumo da zona respiratória.
●Turn power off before servicing.
●Desconectar el cable de ali-
mentación de poder de la máquina
antes de iniciar cualquier servicio.
●Débranchez le courant avant l’entre-
tien.
●Strom vor Wartungsarbeiten
abschalten! (Netzstrom völlig öff-
nen; Maschine anhalten!)
●Não opere com as tampas removidas.
●Desligue a corrente antes de fazer
serviço.
●Não toque as partes elétricas nuas.
●Do not operate with panel open or
guards off.
●No operar con panel abierto o
guardas quitadas.
●N’opérez pas avec les panneaux
ouverts ou avec les dispositifs de
protection enlevés.
●Anlage nie ohne Schutzgehäuse
oder Innenschutzverkleidung in
Betrieb setzen!
●Mantenha-se afastado das partes
moventes.
●Não opere com os paineis abertos
ou guardas removidas.
Specialised Welding Products Ltd
Unit 1, Farringdon Industrial Centre, Farringdon, Nr Alton, Hampshire GU34 3DD, UK
tel: [phone] • fax: [phone] • email: [email protected]