Robur ACF 60-00 - DDC Connection

Installation, Start-Up, Adjustment and Maintenance Manual
43
5.5 DDC CONNECTION
Connection with ACF60-00 UNIT
For the connection of DDC (available as accessory) with ACF60-00 units, consult the instructions, figures and diagrams
only contained in this subparagraph. For further details and/or information refer to the specific “DDC installation,
programming and use manual”.
To well manage one or more units connected to the same hydronic system, it is important to use the DDC,
available as accessory. In such a case, it is necessary to:
- Connect the DDC to the power supply (see “DDC: Electric supply wire connection”)
- Use a CAN-BUS wire to connect the units and the DDC (see “Connection of DDC to the unit”)
DDC: Electric supply wire connection
The DDC should be electrically supplied through a safety
transformer 230 /24 V.a.c. – 60 Hz. With minimum power equal
to 20 VA.
Use an electric supply wire (min. 2 x 18 AWG) and the 4
terminals connector of the DDC (placed at bottom left, back
side) to make the connection as in Figure 19, respecting the
following polarity:
- terminal 1 = 24 V;
- terminal 2 = 0 V;
- terminal 3 = ground
Warning: in all cases terminal 3 of the DDC terminals
connector should be connected to one safety ground (≤ 0,1Ω).
The DDC is also equipped with a plug battery which, in case of
black out, stores in its memory the programmed values; the
plug battery lasts approximately 7 years, then it should be
changed by authorized Service Engineer (TAC).
Figure 19– ELECTRICAL SUPPLY WIRE
CONNECTION
Connection of DDC to the unit
The connection between DDC and the unit (or more units) is made through a CAN-BUS wire, in a way to
create a parameters communication network, characterized by one series of “n” nodes (see Figure 20 and
Figure 21, pag. 44). The parameters communication network can connect max 3 DDC.
Every single object (ACF60-00 unit or DDC) at its connection to the communication network is intended to be a node. Every network
is composed by 2 terminal nodes and of a certain number of intermediate nodes.
NOTE
WARNING