Art. No. SC 1000 KNX
Behaviour when
command value = 100%
(Clipping mode)
keep 100% until setpoint
= actual, then 0%
keep 100% as required,
then adjust downwards
If with a PI control the calculated
command value of the controller
exceeds the physical limits of the
actuator, in other words if the calculated
command value is greater than 100%,
then the command value is set to the
maximum value (100%) and thus
limited. With PI control the command
value can reach the value "100%" if
there is a large deviation of the room
temperature from the setpoint
temperature or the controller requires a
long time to adjust to the setpoint with
the heating or cooling energy that is
being applied. The controller can
evaluate this state in a particular manner
and react to it in various ways. This
parameter defines the functions of the PI
controller when the command value is
100%.
"keep 100% until setpoint = actual, then
0%" setting:
The controller keeps the maximum
command value until the room
temperature (actual value) reaches the
setpoint temperature. After that is
reduces the command value down to
0% all at once (controller reset). The
advantage of this control behaviour is
that in this way sustainable heating up of
undercooled rooms or effective cooling
of overheated rooms will be achieved by
overshooting the setpoint. The
disadvantage is the in some
circumstances the overshooting of the
room temperature may be found
disturbing.
Setting "keep 100% as required, then
adjust downwards":
The controller maintains the maximum
command value only as long as it is
necessary. After that it adjusts the
command value downwards according
to the PI algorithm. The advantage of
this control characteristic is the fact that
the room temperature does not exceed
the setpoint temperature at all, or only
slightly. The disadvantage is that this
control principle increases the tendency
to oscillate about the setpoint.
h Room temperature control (RTC) -> Controller general -> Setpoints
Overwrite setpoints in
device after ETS
programming
operation?
Yes
No
The temperature setpoints programmed
in the room temperature controller by
the ETS during commissioning can be
changed via communication objects.
This parameter can be used to define
whether the setpoints present in the
Page 296 of 347
Software "Smart Control 501511"
Parameters
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