Description Of Protective Devices; Thermal Protection; Description Of The Equipment; Mma Welding - Cebora 254-bi-welder Manual De Instrucciones

Drooping characteristic.
SMAW. Suitable for welding with covered electrodes.
TIG Suitable for TIG welding.
U0. Secondary open-circuit voltage
X. Duty cycle percentage. % of 10 minutes during
which the welding machine may run at a certain
current without overheating.
I2. Welding current
U2. Secondary voltage with current I2
U1. Rated supply voltage
The machine has an automatic supply voltage selector.
1~ 50/60Hz 50- or 60-Hz single-phase power supply
I1 max. This is the maximum value of the absorbed current.
I1 eff. This is the maximum value of the actual current
absorbed, considering the duty cycle.
IP23C Protection rating for the housing.
Grade 3 as the second digit means that this
equipment may be stored, but it is not
suitable for use outdoors in the rain, unless
it is protected.
C: The additional letter C means that the equipment
is protected against access to the live parts of the
power circuit by a tool (diameter 2.5 mm ).
S
Suitable for hazardous environments.
NOTES: The welding machine has also been designed for
use in environments with a pollution rating of 3.
(See IEC 664).

2.3 DESCRIPTION OF PROTECTIVE DEVICES

2.3.1 Thermal protection

This equipment is protected by a thermostat. When the ther-
mostat is tripped, the machine stops delivering current but
6
the fan continues to run. The yellow led (B) lights to indicate
when it is tripped.
Do not shut off the welding machine until the led has gone off.
2.3.2 Protection against incorrect supply voltages.
If the voltage is greater than 270V when the switch (F) is tur-
ned on, the yellow led will flash briefly twice, with a brief
pause between flashes, and the machine will not deliver cur-
rent (Art. 254 is not equipped with this protection).
In this situation the electric circuits are protected, but the fan
may burn out after a few minutes.
If the voltage low during welding, the yellow led flashes every
0.5 seconds and the machine does not deliver current.
2.3.3 Motor-driven generators
These must have a power equal to or greater than 6KVA, and
must not deliver a voltage greater than 260V.
3 INSTALLATION
This must be carried out by skilled personnel. All connections
must be carried out according to current regulations, and in
full observance of safety laws (regulation CEI 26-10 - CENE-
LEC HD 427).
• Make sure that the supply voltage matches the voltage indi-
cated on the specifications plate.
• When mounting a plug, make sure it has an adequate capa-
city, and that the yellow/green conductor of the power supply
cable is connected to the earth pin.
WARNING! Extension cords of up to 30m must have a cross-
section of at least 2.5 mm2.
3.1

DESCRIPTION OF THE EQUIPMENT

A) Current adjustment.
B) Yellow led (see 2.3).
C) Power ON led.
D) Output terminal (-).
E) Output terminal (+).
F) Switch.
G) Mains cable.
H) Connector (Art.262)

3.2 MMA WELDING

• This welding machine is suitable
for welding all types of electrodes,
with the exception of cellulosic
(AWS 6010).
• Make sure that the switch (F) is in
position 0, then connect the wel-
ding cables, matching the polarity
required by the manufacturer of
the electrodes you will be using.
VERY IMPORTANT: Connect the
terminal of the grounding cable to
the workpiece, making sure that
contact is good to ensure smooth
equipment operation and avoid
voltage dips with the workpiece.
• Do not touch the torch or electro-
de clamp simultaneously with the
mass terminal.