
Application manual
KNX room temperature controller EK-EQ2-TP
Release 3.00 - Updating: 27/06/2017
Application Manual
© SBS S.p.A. - All rights reserved
Page 88
Operation
=
temperature dependent
the ventilation handled manually by the user will be anyway interrupted
when the desired conditions are achieved.
The communication between the controller and the actuator can be made indifferently either via the
communication objects of type [1.1] DPT_Switch (168-169-170, Speed 1-2-3 fan) or a single object [5.1]
DPT_Scaling (167 speed continuous fan). It should be highlighted that the object (167, continuous fan
speed), with ON / OFF speed control, does not vary in a continuous manner but assumes only discrete
values, respecting the hysteresis of the ON / OFF windows defined by the thresholds , according to the
following table.
Fan speed in automatic
Communication objects fan speed, [1.1]
DPT_Switch
Communication objects continuous fan
speed, [5.1] DPT_Scaling
V1
V2
V3
Control type: 3 speed
OFF
0
0
0
0 %
1
1
0
0
33,3 %
2
0
1
0
66,7 %
3
0
0
1
100 %
Control type: 2 speed
OFF
0
0
-
0 %
1
1
0
-
50 %
2
0
1
-
100 %
Control type: 1 speed
OFF
0
-
-
0 %
1
1
-
-
100 %
During the changeover, before activating the new speed value, the other ones must be disabled to prevent
damage to the drive of the fan: all the communication objects both binary and continuous are therefore
updated to the OFF (0%) value, before being updated to the next speed value by the internal regulator.
9.1.1.5
Fan-coil with continuous speed control
In this type of control independent 1 Bit communication objects are not used. A single 1 Byte (DPT 5.001
percentage) communication object is used: this implies that, before activating a speed value, it is not
necessary to disable the other ones.
The definition of the hysteresis levels must be carried out directly on the actuator device of the fan-coil. The
application program provides the
Proportional Band
parameter that assumes the same value both for heating
and cooling: this parameter determines the slope of intervention of the fan. The
Minimum change value to
send [%]
parameter is defined in order to limit the telegram traffic on the bus.
0%
T
set
100%
Proportional band
(T set
– T room)
T room
T
set
T room
Min change of value to be sent [%]
0%
100%
Proportional band
(T room
– T set)
Min change of value to be sent [%]