Connection To The Electrical Supply; Power Supply; Control Apparatus; Connection Of Welding Cables - CEA RAINBOW 180 Manual De Instrucciones

1
Fig. A
Connection to the
electrical supply
Before connecting the welder to the
electrical supply, check that the machine's
plate rating corresponds to the supply
voltage and frequency and that the line
switch of the welder is in the "O" position.
Only connect the welder to power supplies
with grounded neutral.
This system has been designed for nominal
voltage V.230 50/60Hz. It can however work at
V.220 and V.240 50/60Hz without any problem.
Connection to the power supply must be
carried out using the tripolar cable supplied with
the system, of which:
• 2 conducting wires are needed for
connecting the machine to the supply
• the third, which is YELLOW GREEN in colour
is used for making the "EARTH" connection.
Connect a suitable load of normalised
plug (2p + e) to the power cable and
provide for an electrical socket complete
with fuses or an automatic switch. The
earth terminal must be connected to the
earth conducting wire (YELLOW-GREEN)
of the supply.
Table 2 shows the recommended load values
for retardant supply fuses chosen according
to the maximum nominal current supplied to
the welder and the nominal supply voltage.
NOTE 1: any extensions to the power cable
must be of a suitable diameter, and absolutely
not of a smaller diameter than the special cable
supplied with the machine.
TABLE 2
Model
I Max nominal 20% (*)
2
Installation power
Nominal current "gl" class fuses
U1=220 V - 230 V - 240 V
Supply connection cable
Section (Length)
Earth cable
Section
(*) Service factor
6
5
4
3
2
Note 2: It is not advisable to plug up
the welder to motor-driven generators,
as they are known to supply an
unstable voltage

Control apparatus

Pos. 1 Supply switch. In the "O" position the
welder is off.
Pos. 2 Rapid connection attachments of the
electrode holder and earth holder gripper.
Pos. 3 THERMOSTAT yellow signal light.
When this light comes it means that the
overheat cut-off has come on, because the
work cycle limit has been exceeded. Wait
for a few minutes before starting to weld
again.
Pos. 4 Welding current adjust potentiometer.
Pos. 5 SUPPLY green signal light. If this light
comes on it means that the welder is on
and ready for operation.
Pos. 6 Selector 3 weld procedures
• ELECTRODE
For basic electrode welding with "arc
force" and "hot start" device.
• Cr-Ni ELECTRODE
For stainless steel welding with special
soft-arc characteristics.
C
• TIG
For TIG welding with thermal controlled
(TCS) "lift" type striking reducing
tungsten inclusions to a minimum and
allowing to also strike on sharp edges.
RAINBOW 180
A 180
kVA 4,6
A 20
2
mm 3 x 2,5
mm 2 25
Fig. B
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 be
used (FIG. B).
Choosing the indications supplied by the electrode
manufacturer, the welding cables must be as short
as possible, close to one other, and positioned at
floor level or close to it.
PART TO BE WELDED
The part to be welded must always be
connected to earth in order to reduce
electromagnetic emission. Much attention must
be afforded so that the earth connection of the
part to be welded does not increase the risk of
accident to the user or the risk of damage to
other electric equipment.
When it is necessary to connect the part to be
welded to earth, you should make a direct
connection between the part and the earth
shaft. In those countries in which such a
connection is not allowed, connect the part to
be welded to earth using suitable capacitors,
in compliance with the national regulations.
WELDING PARAMETERS
Table 3 shows some general indications for the
choice of electrode, based on the thickness of
the parts to be welded.
The values of current to use are shown in the
table with the respective electrodes for the
welding of common steels and low-grade alloys.
These data have no absolute value and are
indicative data only. For a precise choice follow
the instructions provided by the electrode
manufacturer.
The current to be used depends on the welding
positions and the type of joint, and it increases
according to the thickness and dimensions of
the part.
The current intensity to be used for the different
types of welding, within the field of regulation
8
Connection of the
welding cables