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5 - ELECTRICAL CONNECTIONS
5.6 - Field-installed control wiring
IMPORTANT: Connecting the interface circuits on-site creates
certain safety risks; any modification to the electrical box
must ensure the equipment remains compliant with local
regulations. In particular, precautions must be taken to
prevent accidental electrical contact between the circuits
supplied by different sources:
■ The choice of routing and/or insulation characteristics of
the conductors ensures double electrical insulation.
■ The conductors should be fixed together inside the
electrical box to prevent contact between the end of the
conductor and a live part in case of accidental disconnection.
Refer to the 30KAV-ZE SmartVu™ control manual and the certified
wiring diagram supplied with the unit for the field control wiring for
the following features:
■ Remote on/off switch,
■ Capacity limit external switch,
■ Remote dual setpoint,
■ Operating and alarm feedback,
■ Evaporator pump control,
■ Setpoint offset,
■ Various interlocks on the Energy Management Module (EMM)
board option,
■ Control of the variable speed evaporator pump,
■ Refrigerant leakage detection signal (option).
Connections to the customer communication bus
The CCN bus is connected using the connectors specifically
provided inside the electrical box. Two connectors are provided
to allow both permanent and service connections.
The permanent Ethernet bus and USB service socket are
connected using the connector integrated into the touchscreen
interface.
A shielding clamp for the cable from the system is provided near
the permanent bus connectors.
5.7 - Customer and service power reserves
After all possible options have been connected, the CT transformer
ensures the availability of a 1 A power reserve at 24 VAC for the
on-site control cabling.
As an option, the second CT transformer also supplies the 230 V
50 Hz circuit provided to charge a laptop battery, maximum
of 0.80 A. This is connected using a CEE7/17 standard, type E
socket. An earth leakage switch provides this circuit with additional
protection. Its cut-off setting is 10 mA.
5.8 - Fan motors
The fan motors are axial Flying Bird fans equipped with a rotating
shroud and made of composite recyclable material. Each motor
is fixed with transverse supports.
All the fans in the same refrigerating circuit run together at the
same rotation speed. The fan speed is controlled by an algorithm
that continuously optimises the condensing temperature to obtain
the best energy efficiency (EER) for the units, whatever the
operating conditions.
5.8.1 - AC motors
The standard units are equipped with AC motors, controlled by
one or more variable speed drives. The motors are three-phase,
with lifetime lubricated bearings and class F insulation (IP55 level).
In case of a locked rotor or an overload, the motors of each circuit
are electrically protected by the circuit's variable frequency drives
(VFD). Each VFD follows an overcurrent curve, which varies
according to the frequency from 5 to 50 Hz and the number of
fans controlled.
If a fan fails to operate (in open circuit), the lack of current is
detected, generating an alert on the user interface. Refer to the
control manual for the description of alarms specific to this option.
5.8.2 - EC motors
On 30KAV-ZE units with option 17, and on 30KAVPZE units, the
fans are driven by EC motors (electronically commutated motors).
These are motors with permanent magnets, equipped with their
own embedded electronics which enables the speed to be varied
and also provides protection.
These motors are more efficient than asynchronous motors.
The speed is controlled by analogue voltage in the range 0-10Vdc.
The motors for each refrigerating circuit are controlled by the same
0-10 Vdc control signal. They are supplied with a three-phase
400V AC power supply, and the order of phases has no impact
on the direction of rotation, as this is factory-set.
5.8.3 - Distribution of fans within the unit
The distribution of fans for the refrigerating circuits and their
description is given below (simplified representation on the
machine seen from above):
11
21
A
A
12
22
A/B
B
WARNING: The fan listed as 12 may be allocated to circuit A
or to circuit B, depending on the machine. It may be powered
by the variable drives from one or other of these circuits:
Refer to the wiring diagram for the unit.
31
41
A
A
32
42
B
B
33
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