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Continuous drive actuator CHEOPS drive
theben
As of: Jul-11 (Subject to change without notice) Page 7 of 41
1.4 Application options
Cheops drive is used in combination with a continuous room temperature controller.
This involves the actuating value of the room temperature controller (RTC) being combined
with Object 0.
In order to avoid unnecessary energy loss if a window is open, the heating output should be
reduced in this case, which necessitates the use of window contacts. Because Cheops drive is
often positioned near a window, it is possible to use the external interface in this case. In this
case, Object 5 is combined with the frost protection or window object of the room
temperature controller. To create a simple solution, Object 5 can also be combined with
Object 1. In this case, when the window is opened, the valve moves to a pre-defined position.
A switch for presence reporting can be connected via the second input of the external
interface. In this case, Object 6 is combined with the comfort object of the room temperature
controller.
Object 4 is controlled by a timer or a switch. Cheops drive switches to summer mode via a 1
on this object, i.e. the valve remains closed.
RTC actuating values are ignored, which prevents unnecessary heating, in the morning for
instance, before the set point temperature is not yet reached.
Cheops drive can monitor the RTC function and for this purpose regularly expects actuating
value messages from the RTC. Should these messages fail, an alarm message can be sent via
Object 7. These can be evaluated for maintenance purposes in the central controller.
If a heating boiler with control for needs-driven forward control, the objects 3 (maximum
position of all Cheops drive and the corresponding input of the boiler control are connected to
a common group address.
1.5 Special features
Monitoring the actuating value
Cheops drive can control the function of the room temperature controller. To do this, the
time delay between 2 actuating value messages is monitored and an alarm message triggered
on actuating value failure.
Determining the maximum actuating value (= maximum position)
To adapt the forward flow temperature, Cheops drive can send an acknowledgement to the
heating boiler regarding the current power requirement.
This can reduce its temperature if the requirement drops.
Window and presence contact inputs
Cheops drive has 2 external inputs, one for a presence contact and
one for a window contact. These inputs can be sent on the bus and used to initiate frost
protection or comfort mode.
7


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