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ELECTRICAL CONNECTIONS
1) Connection to the electricity main
• Feeder line
;
The feeder line of the machine must follow a well defined route without interruptions. Run the line through the precut hole at the
bottom of the right panel on the machine. It is advisable to use a cable gland, to secure the line to the machine structure. Now
route the line inside the compressor compartment until it reaches the hole in the bottom of the electric panel. Here again, make
sure you use an adequately sized cable clamp,
use a high temperature cable or sheath, not place the cable or sheath on
the compressors.
Connect the conductors straight to the input terminals of the main circuit-breaker of the machine.
• Powering system
;
The power cables of the feeder line of the machine must come from a symmetric threephase voltage system complete with neu-
tral conductor and separate protection conductor.
V= 400V ± 10%
f= 50 Hz
• Protection on supply side
;
An automatic switch must be installed on the supply side of the side in order to protect against any overcurrents and indirect con-
tacts that could occur when the machine is operating.
It is advisable to install an automatic current limiter switch in order to limit the effective short-circuit current in the connecting point
of the machine. This allows a protection device with a lower breaking capacity than that required in the connection point to be
sized like the main circuit-breaker of the machine.
The line and switch must be coordinated in compliance with the current laws governing electrical safety matters, regarding the
type of installation and environmental conditions in which the machine must operate.
• Protection conductor
(ground wire);
The protection conductor from the feeder line must be connected straight to the ground screw identified by code "
PE
", which
ensures the equipotential connection of all metal grounding points and structural parts of the machine.
• Neutral conductor
:
The neutral conductor in the feeder line must be connected to the neutral conductor identified by the letter "
N
" corresponding to
the fourth pole of the main panel circuit-breaker (if possible).
2) Electric panel
• Protection degree
:
The electric panel casing is made of galvanised sheet metal and has an
IP54
protection degree in corre spondence to the door,
which can be directly accessed from outside. The other parts of the casing guarantee a protection degree that is at least equi-
valent to
IP22
, as established by the current laws in force: this has been achieved since the panel has further protection against
the penetration of solid foreign bodies and atmospheric agents thanks to the machine structure in which it is housed.
• Starting and stopping function
:
The red handle on the panel door directly acts on the main circuit-breaker. The handle also acts as a door lock since it ensures
that the machine is only powered when the door is shut. The stopping function carried out by the main circuit-breaker is classi-
fied as type "0" since the machine is stopped by immediately cutting off the power supply.
• Emergency function
:
The handle also acts as an emergency stop since it can be directly accessed removing the cover panel and is also evident owing
to its red colour.
3) Reference standards
•
The provisions established by the following Directives have been complied with to ensure the safety of the electrical products
placed on the European Union market:
-
Low Voltage Directive
2006/95 EEC
which also includes the following harmonized standards:
CEI EN 60335-1
and
60335-2-40
.
Classification:
CEI EN 60204-1
. Safety of machinery. Electrical equipment of machines. Part 1:
General rules.
-
Directive
2004/108/EEC
concerning "
Electromagnetic compatibility
".
