JAVAC NBM-500L Manual page 4

CONNECTION OF THE WELDING CABLES
 Electrode welding (MMA)
With the machine disconnected from the supply, connect the
welding cables to the out terminals (positive and negative) of
the welder, connecting them to the gripper and the earth,
with the correct polarity provided for the type of electrode to
 MIG-MAG / MIG PULSED / MIG DUAL PULSED welding
DIRECT-POLARITY welding
To start MIG-MAG welding, make the connections shown in
Figure 3
, more precisely (with the machine switched off):
connect the generator - feeder connecting cable as shown in
Figure 3
. Gas cylinders are supplied with a pressure reducer
to adjust pressure of the gas used for welding;
• connect up the earthing system cable to the rapid coupling
marked by a - (negative) symbol and then the relevant
earth clamps to the piece being welded or to its support in
an area free from rust, paint and grease. Using particularly
long earthing cables reduces the voltage and causes
be used. Choosing the indications supplied by the electrode
manufacturer, the welding cables must be as short as pos-
sible, close to one other, and positioned at floor level or
close to it.
Figure 2
some problems from increased resistance and inductance
of the cables that could cause faulty welding. Follow in-
structions to avoid these problems:
- use earthing and extension cables with appropriate sec-
tion;
- lay out the cables as a flat as possible to prevent them
from coiling up.
• screw the torch power cable to the centralized attachment
on the front panel of the wire-feeder and connect up the
delivery and return water tubes to their rapid couplings
located on the wire-feeder.
Figure 3