Operation Manual

Continuous valve actuator CHEOPS control
theben
As of: Jul-11 (Subject to change without notice) Page 70 of 71
7 Glossary
7.1 Basic set point value
The basic set point value is the standard temperature for comfort mode and the reference
temperature for reduction in standby and night modes.
The programmed basic set point value (see "Basic set point value after download of
application" is stored in Object 0 and can be changed at any time by sending a new value
to Object 0 (EIS5).
After reset (bus returned), the last used basic set point value is restored.
7.2 Hysteresis
On Cheops control, the hysteresis determines how far the temperature should drop below the
set point value before the control switches on the additional step again.
Example with set point value (additional step) 20
o
C, hysteresis 0.5 K and starting temperature
19
o
C.
The additional step is switched on and does not switch off again until the set point value (20
o
)
is reached.
The temperature falls and the additional step does not switch on again until 20°C-0.5K= 19.5°
is reached.
Without hysteresis, the controller would switch on and off continuously provided the
temperature is within the set point value range.
7.3 Continuous and switching control
With a continuous actuating value, the valve is brought to any position between 0% and
100%. This achieves in a pleasant and precise control.
A switching control has only 2 statuses, On or Off, i.e. in our case, valve fully open or fully
closed.