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.
②
Notice positive and negative connection during welding.
A negative connection B positive connection
8
1
9
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 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
