Assembly And Installation Instructions; Power Supply Connections; Installation; Installation Warnings - Carel pAD Manuel D'utilisation

3.1

Assembly and installation instructions.

Disconnect the power supply before working on the device during
assembly, maintenance and replacement.
The spacing of the mounting holes is designed so that the device can be fitted to a flush-
mounted sockets, compliant with standards CEI C.431 - IEC 670. If a socket is not
available, use the mounting holes on the shell as a template for drilling the wall, and
then use the screws and wall plugs supplied.
The connection cables must run through the hole in the centre of the rear shell of the
device, and must be fastened to the terminals on the shell.
Inside view of the rear shell
To access the connection terminals, release the rear shell by levering the locking tab. The
device must be flipped open, with the "hinge" at the top of the instrument and lifting the
bottom. When closing, make sure that the pins on the board are inserted into the
corresponding terminals, and that the cables do not get in the way.
Bottom view
Adopt precautions against electrostatic discharges when handling the board.
Do not touch or nearly touch the electronic components on the boards to
avoid electrostatic discharges from the person handling the board to the
components.
3.2

Power supply connections

Observe the following warnings:
•
The power supply terminals on the device are marked G and G0. The
connection is made using 2-pin screw terminals fastened to the rear shell of
the instrument. Use cables with a cross-section from 0.5 to 1.5 mm
•
A dedicated 250 mAT fuse must be installed externally, between the
power supply and terminal G;
•
use a class 2 safety transformer with a minimum rating of 4 VA.
•
If the transformer or power supply used for the device is the same used for
the controllers connected in the serial line, then terminal G0 on the pAD
must be connected to the G0 line of the controllers.
pAD +030220870 - rel. 1.2 18.01.2013

3. INSTALLATION

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•
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3.3
pAD uses an RS485 serial interface for communication with the controllers, via 3-pin
plug-in terminals.
Use a shielded twisted pair cable, AWG20-22, with the total length of the network not
exceeding 500 m. The capacitance between the wires must not be greater than 90 pF/m.
To reach the maximum length, use a bus layout with branches that do not
exceed 5 m.
Further limits to the length may be required in environments with
considerable electrical disturbance. See the controller manual to determine
the connections.
Protocols supported:
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•
3.4
Avoid installing the boards in environments with the following characteristics:
• relative humidity greater than the value specified;
• strong vibrations or knocks;
• exposure to water sprays;
• exposure to aggressive and polluting atmospheres(e.g.: sulphur and ammonia fumes,
saline mist, smoke) so as to avoid corrosion and/or oxidation;
• strong magnetic and/or radio frequency interference (for example, near transmitting
antennae);
• exposure to direct sunlight or the elements in general;
• large and rapid fluctuations in the room temperature;
• environments where explosives or mixes of flammable gases are present;
• exposure to dust (formation of corrosive patina with possible oxidation and reduction
of insulation).

Further information

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Important: if a terminal of the power supply needs to be earthed, use
terminal G0 (and NOT terminal G), both on the pAD the other powered
devices.
When pAD has a DC power supply, the controllers connected via the serial
interface must also have a DC power supply. If the controllers connected
do not allow DC power, (see the manual for the controllers) then the pAD
cannot have a DC power supply.
The power supply or the power transformer used must guarantee double
or reinforced insulation between the high voltage mains and the terminal.

Serial interface

pLAN protocol via RS485. The pLAN network is made up of a series of
controllers and terminals that interact with each other, exchanging variables
and information. The physical limit is 32 units, with a maximum of 30 pAD
devices.
Carel / Modbus via RS485 (in the models where available)

Installation warnings

A power supply other than the one specified may seriously damage
the system.
Important: if the device is used in a way that is not specified by the
manufacturer, the protection of the device may be compromised.
Use cable ends suitable for the corresponding terminals. Loosen
each screw and insert the cable ends, then tighten the screws. When
the operation is completed, slightly tug the cables to check they are
sufficiently tight.
To clean the display use a soft cloth. Do not use water.
Operation at particularly low temperatures may cause a visible
decline in the response speed of the display. This should be
considered normal and does not indicate a malfunction.
The terminal must be fastened to the wall in such a way as to allow
the recirculation of air through the slits on the rear shell. Avoid places
where the room temperature measurement may be altered, for
example outside walls, near doors leading to the outside or in direct
sunlight.
Separate the cables running to the device from cables that supply
inductive loads and power cables, so as to avoid possible
electromagnetic disturbance. Never use the same conduits for the
power cables (including other electrical cables) and serial
communication cables. Do not install the communication cables in
the immediate vicinity of power devices (contactors, circuit breakers
or similar).
ENG