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Inverter Welding Machine
6 Input cable
7 Power switch
8 Cooling fan
Technical Data
Model
PMI140-C1
Rated voltage
190-250V~ / 50Hz
Rated power
4000 W
tening socket of “+” polarity at the front
panel, fasten it clockwise, and the earth
clamp at the other terminal clamps the
work piece.
►Please pay attention to the connecting
polarity,DC welding machine has two
connecting ways: positive connection and
negative connection. Positive connection:
holder connects with “-”terminal, while
work piece with the “+” terminal. Negative
connection: work piece with the“-” terminal,
holder with the “+” terminal. Choose suit-
able way according to working demands.
If unsuitable choice, it will cause unstable
arc, more spatters and conglutination. If
such problems occur, please change the
polarity of the fastening plug.
►According to input voltage grade, connect
power cable with power supply box of rele-
vant voltage grade. Make sure there is no
mistake and the voltage of power supply
does not exceed permission range. After
the above job, installation is finished and
welding is available.
If distance of work piece and machine
is too far (500-100m), and the ca-
bles(torch cable and earth cable) are
too long, please choose cable of bigger sec-
tion to minimize the reduction of the voltage.
Operation instruction
►Open the power switch, screen will show
set current value and ventilator is begin-
ning to run.
►Adjust knobs of welding current and
arc-striking push, make welding function
complies with demands.
►Generally, welding current is adequate to
welding electrode according with as follow-
ing:
Specification
Current
φ2.5
70-100 A
φ3.2
110-160 A
φ4.0
170-220 A
φ5.0
230-280 A
Electrode diameter
Ø1.6-3.2 mm
(1/16"-1/8")
Welding current
10-140 A
Weight
3.5 kg
Contents of delivery
Inverter welding machine
1 pc
Cable with electrode holder
1 pc
Cable with grounding terminal
1 pc
Carrying strap
1 pc
Instruction manual
1 pc
Note
Technical errors and typographical errors may
be made in the text and numerical designa-
tions of the instructions.
Since the product is constantly being im-
proved, P.I.T. reserves the right to make
changes to the specifications and product
specifications specified here without prior no-
tice.
Installation instruction
The machine is equipped with power voltage
compensation equipment. When power volt-
age fluctuates between±10% of rated voltage,
it still can work normally.
When use long cable, in order to prevent volt-
age form going down, bigger section cable is
suggested. If cable is too long, it may affect
the performance of the power system. So we
suggest you to use configured length.
►Make sure intake of the machine not
blocked or covered, lest cooling system
could not work.
►Ground the cables with section area no
less than 6mm2 to the housing, the way is
connecting screw in the back of the power
source to ground device, or make sure
ground terminal of power socket is firmly
connected. Both ways can be used for ab-
solute safety.
►Correctly connect the arc torch or holder
according to the sketch. Make sure the
cable, holder and fastening plug have
been connected with the ground. Put the
fastening plug into the fastening socket at
the “-”polarity and fasten it clockwise.
►Put the fastening plug of the cable to fas-
Attention! Remember that the nature of the
weld depends not only on the amperage, but
also on other parameters such as the diam-
eter and quality of the electrodes, arc length,
welding speed and position of the welder, as
well as the condition of the electrodes, which
must be stored in the packaging and protect-
ed from dampness.
►To start welding, you need to touch the
welding point with the end of the electrode,
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