Operation Manual

Continuous valve actuator CHEOPS control
theben
As of: Jul-11 (Subject to change without notice) Page 57 of 71
5.6 Limit of actuating value
To control the temperature, Cheops control sets an actuating value of between 0% and 100%.
For practical reasons, it is not usually necessary to use the entire bandwidth of between 0%
and 100%).
5.6.1 Minimum actuating value
The unpleasant whistling noise that some valves can generate at low actuating value, can be
avoided by specifying a minimum actuating value.
If, for instance, this response is determined at below 8%, a minimum actuating value of 10%
is specified.
On receipt of a actuating value below the specified limit value, Cheops control can respond in
one of 2 ways ("Response on under-running the minimum actuating value in heating
operation"):
• Either move to immediately to 0% ("0%")
• or stop at the position of the minimum actuating value and do not close valve
completely until actuating value 0% is received (0%=0% otherwise minimum
actuating value)