Carel ADPB003000, User Manual

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pAD +030220873 - rel. 1.2 18.01.2013 25
3. INSTALLATION
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
2
.
•
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.
•
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.
3.3 Serial interface
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:
•
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)
3.4 Installation warnings
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).