Power Supply; Electrical Connections - comatec AQWL Installations- Und Wartungshandbuch

4.6 Power supply

Before carrying out any operations on the
electrical system, make sure that the unit is
deenergised.
DANGER
It is important that the appliance is grounded.
DANGER
The company in charge of the installation shall
conform to the standards applicable to outdoor

electrical connections.

DANGER
The manufacturer may not be held liable for any damage and/or
injury caused by failure to comply with these precautions.
The unit conforms to EN 60204-1.
The following connections shall be provided:
A 3-phase and grounding connection for the power supply
n
circuit.
The electrical distribution system shall meet the power absorbed
n
by the appliance.
The disconnecting and magnetothermal switches must be sized to
n
control the starting current of the unit.
The power supply lines and the insulation devices must be
n
designed in such a way that every line independent.
It is recommended to install differential switches, to prevent any
n
damage caused by phase drops.
The fans and compressors are supplied through contactors
n
controlled from the control panel.
Each motor is provided with an internal safety thermal device
n
and external fuses.
The power supply cables must be inserted into dedicated
n
openings on the front of the unit, and the will enter the electrical
board through holes drilled on the bottom of the board.
4 - Installation (continued)
16
4.7 Electrical connections
The unit must be installed on site according to the Machinery
Directive (2006/42/EC), the Low Voltage Directive (2006/95/EC),
the Electromagnetic Interference Directive (2004/108/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 provided in this manual.
The power supply lines must consist of insulated copper
conductors, dimensioned for the maximum absorbed current.
Connection to terminals must be performed according 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 Electric Data (Chapter
8).
WARNING
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 voltage of each phase couple and their mean
value during operation.
The maximum % value of these differences (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
unbalance exceeds the permissible value will
automatically void the warranty.
WARNING