Ter Welding Smart Welder MMA 140, User Manual, Page: 14 / 25

3 Installation
The welding equipment is equipped with power voltage compensation device. It keeps the machine
work normally when power voltage fluctuating ±15% of rated voltage.
When using long cable, in order to reduce voltage drop, big section cable is suggested. If the cable
is too long, it will affect the performance of arcing and other system function, it is suggested to use
the recommend length.
 Make sure the intake of the machine is not covered or blocked to avoid the malfunction of the
cooling system.
 Use ground cable whose section no less than 6mm 2 to connect the housing and earth. The
method is to connect the grounded interface in the back to the earth device, or make sure the
earth end of power interface has been reliably and independently grounded. Both ways can be
used together for better security.
Installation Procedures
a) Make sure cable with electrode holder and quick plug connected well. Connect the quick plug
to the socket “-” of the machine, and fasten it clockwise tightly.
b) Connect the quick plug at one end of the cable into the socket “+” of the machine, and fasten it
clockwise, the other end clamps the workpiece.
c) Please pay attention to the connecting terminal, 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 suitable way according to the working situation.
If unsuitable choice is made, it will cause unstable arc, more spatters and conglutination. If
such problems occur, please change the polarity of the fastened plug. It should adopt negative
connection when welding with alkaline electrode, while positive connection when welding with
acid electrode.
This procedure shall be operated by electrician!
Connect proper power cable to the distribution box with corresponding capacity according to the
input voltage and current (See technical parameter table). Do not connect to the inappropriate
voltage and make sure that the difference of power supply is within permitted range.
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