Carel Heos, User Manual

Page: 14 / 60

14
ENG
Heos +0300078EN - rel. 1.6 - 23.11.2017
2.9 Installation
For installation, proceed as follows, with reference to the wiring diagrams:
•
before performing any operations on the control board, disconnect
the main power supply by turning the main switch in the electrical
panel OFF.
•
avoid touching the control board with bare hands, as any electrostatic
discharges may damage the electronic components;
•
suitable electrical protection must be ensured by the manufacturer of
the showcase or by appropriate installation of the controller;
•
for safety devices (e.g.: residual current circuit breakers), comply with
the following requirements:
-
IEC 60364-4-41
-
Normative in vigore nel paese
-
standards in force in the country where the product is installed
-
connection technical requirements established by the electricity
company
•
if use a B or B+ residual current circuit breaker when the compressors
are controlled by inverter; these protection devices must always be
installed always upstream of the AC/A/F (see the fi gure below)
Type
AC/A/F
Wh
I
Δn
≥300 mA
S
Type
AC/A/F
I
Δn
≤100 mA
Type
B/B+
I
Δn
≥30 mA
kHz
NO
OK
Fig. 2.q
The diff erential protection device, inside a TT,TN network, can be used for
several showcases as shown in the example below.
Fig. 2.r
Attention: the size and the tripping current of the diff erential
switch must be properly sized in accordance with the network type (TT,
TN-C, TN-S) and the number of inverters connected.
•
connect any digital inputs, Lmax=10 m;
•
connect the temperature and pressure probe, Lmax=10 m;
•
connect the electronic expansion valve cable to connector J12;
•
connect the inverter serial communication cable (if used) to terminal
J11;
•
connect the optional PGDe terminal (needed for commissioning) to
connector J15;
•
connect the optional PLD terminal to connector J10;
•
connect power supply to controller and the inverter, if used;
•
program the controller using the guided commissioning procedure:
see the chapter on Commissioning”.
•
Program the individual controllers using the Wizard (also used to assign
the pLAN address) and then connect the controllers in the same pLAN
Master/Slave group together, using connector J14. For connection, use
a shielded cable and make sure that the maximum distance between
consecutive controllers is 100 m (minimum cable size AWG22);
•
connect the electrical loads to the relay outputs only after having
programmed the controller. Always carefully evaluate the maximum
capacity of the output relays, as specifi ed in the Technical specifi cations;
•
connect the supervisor serial line to the card inserted on connector
J13.
Important: avoid installing the controllers in environments with
the following characteristics:
•
relative humidity greater than 90% or with condensation;
•
strong vibrations or knocks;
•
exposure to water sprays;
•
exposure to aggressive and polluting atmospheres (e.g.: sulphur
and ammonia fumes, saline mist, smoke) to avoid corrosion and/or
oxidation;
•
strong magnetic and/or radio frequency interference (therefore avoid
installing the devices near transmitting antennae);
•
exposure of the controllers to direct sunlight and to the elements in
general.
Important: the following warnings must be observed when
connecting the controllers:
•
incorrect power connections may seriously damage the controller;
•
use cable ends suitable for the corresponding terminals. Loosen each
screw and insert the cable ends, then tighten the screws and gently
tug the cables to check they are suffi
ciently tight;
•
separate as much as possible the probe and digital input cables from
cables to inductive loads and power cables, so as to avoid possible
electromagnetic disturbance. Never run power cables (including the
electrical panel cables) and probe signal cables in the same conduits;
•
do not run probe signal cables in the immediate vicinity of power
devices (contactors, circuit breakers, etc.);
•
reduce the path of probe cables as much as possible, and avoid spiral
paths that enclose power devices.
Important: Class A software: the safety devices providing overload
and high pressure protection must control the compressor directly, and
consequently need to be wired in series with compressor contactor
control signal.
Note: when connecting the serial network:
•
connect the shield to the GND terminals on all controllers;
•
do not earth the shield on the electrical panel;
•
use a shielded twisted cable AWG20-22 (e.g. Belden 8761 or, in the
event of particularly demanding environments from a point of view of
electromagnetic disturbance, Belden 3106A);
•
For the supervisor serial network (J13): connect a 120 Ω terminating
resistor between the Tx/Rx+ and Tx/Rx- terminals on the last controller
in the network (the one furthest away from the supervisor). Do connect
any resistors to the pLAN Master/Slave network connectors (J14).