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Continuous drive actuator CHEOPS drive
theben
As of: Jul-11 (Subject to change without notice) Page 31 of 41
5.4 Monitoring the actuating value
5.4.1 Application
Should the room temperature controller (RTC) fail, despite the last sent actuating value being
0%, all valves remain closed, irrespective of the continued temperature characteristic curve.
This can result in considerable damage, if for example, cold air enters the room when the
outdoor temperature is below zero.
To avoid this situation, Cheops drive is able to guarantee the following functions:
monitor the correct function of the room temperature controller
start an emergency program on actuating value failure
send the status obtained from actuating value monitoring
5.4.2 Principle
Cheops drive monitors whether, within the configured time value, at least
1 actuating value message is received and assumes a pre-defined position should the actuating
value fail.
5.4.3 Practice
The RTC is configured for cyclical sending of the actuating value.
On Cheops drive, the monitoring time is set to a value that is at least twice the cycle time of
the RTC.
If the RTC sends an actuating value every 10 minutes, the monitoring time must be at least 20
minutes.
After an actuating value failure, normal operation is resumed as soon as a new actuating value
is received.
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