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Continuous drive actuator CHEOPS drive
theben
As of: Jul-11 (Subject to change without notice) Page 19 of 41
Continued:
Designation
Values
Meaning
Minimum actuating value
0%
5%
10%
15%
20%
25%
30%
40%
Smallest valve position to be
approached
This parameter
prevents the valve whistling if
the flow rate is too low.
Behaviour at minimum
actuating value underflow
0%
0 % = 0 % otherwise min.
actuating value
Cheops drive runs to 0% for
every actuating value that lies
below the minimum value
For every actuating value that
lies below the minimum
value, Cheops drive runs to
the position of the predefined
minimum actuating value.
The valve does not close fully
until an actuating value of 0%
is reached.
Maximum actuating value
60%
70%
75%
80%
85%
90%
95%
100%
Highest valve position to be
approached.
Hint: Because most valves do
not change their flow between
60% and 100%, the
positioning frequency can be
reduced by indicating a
maximum actuating value of
60%.
Drive to new valve position
position always accurate
At change of act. value >1 %
At change of act. value >2 %
At change of act. value >3 %
At change of act. value >5 %
At change of act. value >7 %
At change of act. value >10 %
At change of act. value >15 %
The valve is re-positioned
each time the control variable
is changed.
The valve is never re-
positioned until the control
variable has changed from the
last position by more than the
set value. Enables frequent,
small positioning increments
to be suppressed
Important:
Too high values can affect the
temperature control.
19


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