Airwell SLS 2702 [17/77] Installation
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Airwell SLS 2702 [17/77] Installation

Airwell SLS 2702 [17/77] Installation
Page 16
Installation
4.6 Power supply
Before carrying out any operations on the
electrical system, make sure that the unit is
deenergised.
It is important that the appliance is ground-
ed.
The company in charge of the installation
shall conform to the standards applicable to
outdoor electrical connections.
Itelco-Industry may not be held liable for any dam-
age and/or injury caused by failure to comply with
these precautions.
The unit conforms to EN 60204-1.
The following connections shall be provided:
I
A 3-phase and grounding connection for the pow-
er supply circuit.
I
The electrical distribution system shall meet the
power absorbed by the appliance.
I
The disconnecting and magnetothermal switches
must be sized to control the starting current of the
unit.
I
The power supply lines and the insulation devices
must be designed in such a way that every line in-
dependent.
I
It is recommended to install differential switches,
to prevent any damage caused by phase drops.
I
The fans and compressors are supplied through
contactors controlled from the control panel.
I
Each motor is provided with an internal safety
thermal device and external fuses.
I
The power supply cables must be inserted into
dedicated openings on the front of the unit, and
the will enter the electrical board through holes
drilled on the bottom of the board.
4.7 Electrical connections
The unit must be installed on site according to the
Machinery Directive (98/37/EC), the Low Voltage Di-
rective (73/23/EC), the Electromagnetic Interference
Directive (89/336/EC) and the usual procedures and
standards applicable in the place of installation. The
unit must not be operated if its installation has not
been carried out according to the instructions provid-
ed in this manual.
The power supply lines must consist of insulated cop-
per conductors, dimensioned for the maximum ab-
sorbed current.
Connection to terminals must be performed accord-
ing to the diagram of connections (User’s Terminal
Box) provided in this manual and according to the
wiring diagram which accompanies the unit.
Before connecting the power supply lines,
check that the available voltage value does
not exceed the range specified in the Elec-
tric Data (Chapter 8).
For 3-phase systems, check also that the unbalance
between the phases does not exceed 2%. To perform
this check, measure the differences between the volt-
age of each phase couple and their mean value dur-
ing operation. The maximum % value of these differ-
ences (unbalance) must not exceed 2% of the mean
voltage.
If the unbalance is unacceptable, contact the Energy
Distributor to solve this problem.
Supplying the unit through a line whose un-
balance exceeds the permissible value will
automatically void the warranty.
The twin units SLS twin units are provided with two
switchboards positioned at the ends of the units. A
switchboard is identified as “Master” and includes
the control panel (keyboard - display), the other as
auxiliary “Slave”. Each switchboard must be con-
nected to the relative power supply line. A single
point for power supply can be provided using a
shunt board (supplied as an accessory).
SLS1-en.qxp 29-06-2007 15:37 Pagina 16

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