77/213
Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 8 Connection to load controllers 01.12.2009
8.7 Prioritization of power sources
To simplify configuration of the system, the power source need not be selected. The
system automatically detects the available power sources and selects them. If several
sources are used, they are selected according to the following priorities:
Parameter 942 Priority Active power source
1 highest Chapter Controller-on-contact X5-03, terminal 1
When the input is activated, the other output
sources is assessed according to their priorities.
When the input is deactivated, the burner is off
1 2 Chapter Output with curve settings
2 3 Chapter Manual output
3 4 Chapter Load controller via the building automa-
tion system
4 5 Chapter External load controller via analog input
X64 terminal 1 / terminal 2
5 6 lowest Chapter External load controller via contacts X5-
03, terminal 2 / terminal 3
The active power source can be read out via parameter 942.
8.7.1 Emergency operation with several load controllers
By making use of the prioritization described above, it is also possible to implement
emergency operation. Should the building automation and control system fail (provided
parameter 148 is set to undefined (--)), the unit switches automatically over to the exter-
nal load controller.
A load controller via analogue input or, if existing via contacts can be connected.
8.7.2 Manual control
If the external load controller via analogue input or via contacts is not used, a simple
manual output adjustment via switch can be implemented by cutting the connection to
the load controller for switching from automatic to manual operation. In that case, the
system switches to the external load controller via contact. An OPEN / CLOSED switch
or stage 2 / stage 3 can then be connected to its terminals.
To Next Page
Loading...
Need help?
General
