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Direct Digital Controller
52
Direct Digital Controller fw 4.013 – Ed. 01/2013
4 INSTALLATION
4.1 CONNECTING THE DIRECT DIGITAL CONTROLLER
Before proceeding with operations for the creation of the electrical system, the professionally
qualified personnel concerned is urged to read carefully the “Warnings” contained in Section 1,
“GENERAL WARNINGS”, of this manual:
they provide important indications regarding installation safety
and references to current norms.
Incorrect installation may cause damage to persons, animals or things, for which the manufacturer
may not be deemed responsible.
4.1.1 GENERAL INFORMATION
The connection of the
Direct Digital Controller (DDC)
requires:
Power supply to the Direct Digital Controller;
Connection of the DDC and all units via a CAN-BUS cable.
BEFORE CARRYING OUT ANY OPERATION TO CONNECT THE DIRECT DIGITAL CONTROLLER,
DISCONNECT THE POWER SUPPLY FROM THE UNITS BY MEANS OF THE MAIN POWER SWITCH
PROVIDED BY THE ELECTRICAL INSTALLATION TECHNICIAN.
Power supply of the Direct Digital Controller
The Direct Digital Controller must be supplied by a 230/24 V.a.c safety
transformer - 50/60 Hz power no less than 20 VA (not supplied); in
particular, this transformer must comply with standard EN 61558-2-6.
Use a 3 x 0, 75 mm 2 electrical connecting cable and make the
connections on the terminals of the 4-pole connector located at the
bottom left of the rear of the DDC, respecting the polarity as in the
diagram on the right
-
terminal 1 = 24 V;
-
terminal 2 = 0 V;
-
terminal 3 = ground.
The maximum length for this cable is 1 m.
Warning
: in any case, terminal 3 of the DDC’s 4-pole connector must
be connected to a safety ground (RCO < 1
Ω
).
The Direct Digital Controller is additionally equipped with a backup
battery which, in the absence of electrical power, is able to preserve
values set in memory.
The duration of the backup battery is
approximately 7 years
, after which it is necessary to replace it (by
contacting a
ROBUR Technical Assistance Centre
).
Connecting the Direct Digital Controller to the units
The Direct Digital Controller must be connected to the units via a CAN-BUS cable, to create a data
communication network, characterised by a series of “n” nodes as indicated in the examples in Figure 11 or
Figure 12.
WARNING
Respect the polarity:
1 = 24 Vac
2 = 0 Vac
Obligatory ground
DIRECT DIGITAL
CONTROLLER (rear
view)
NOTE
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