Rotex Controller Series Product Documentation page 117

EbV
Example of the coaction of P-band, I-band, adjustment time and sample time
Step response to different control deviations
(open control circuit, actuator pulled off)
Integral action time Tn=7 min
Sample time Ta=20 sec
Mixer running time = 2 min
The P-pulse, which is proportional to the control
deviation, is followed by further actuator pulses if the control
deviation was not eliminated at that point (I-band).
The integral action time remains constant for different
control deviations.
8.2.3.4.1 End position function actuator
This function determines the type of control signal in the end positions OPEN and CLOS of each actuator.
1 = Continuous voltage signal at connector OPEN or CLOS at the respective end position
2 = De-energized in end position OPEN or CLOS respectively
When the limit stop of the actuator is reached (0 / 100 %), the actuator is in idle state
(STOP). To balance the running time tolerancies, a drain function of 100 % of the set
mixer running time takes place after reaching the limit stop.
Recommendation for the basic setting of the adjustment time in different heating systems:
If the parameter for the control of the limit stop = 2, the position signal (OPEN or CLOS) is sent after the
absolute valve position is recognised and the valve is at the limit stop (0 / 100 %) (display STOP). Just in
case, a drain function of 100 % of the set mixer running time takes place after reaching the limit stop. This
function ensures that the valve is at the required limit stop.
Operation:
Adjustment time Tn
Adjustment time Tn
Actuator pulses for control deviation (X
Actuator pulses for control deviation (X
Floor heating and other static heating surfaces
Radiator heating
Convector heating
Note on operation
Proportional band Xp
Sample time Ta
Integral action time Tn
Actuator Running Time
End position function actuator
Product documentation THETA NORM/UNIT
Mixer opening (%)
Position OPEN
= 50%)
w
= 25%)
w
P-band
Application
Key / parameter tree
MIX. VALVE-1 / 2
MIX. VALVE-1 / 2
MIX. VALVE-1 / 2
MIX. VALVE-1 / 2
MIX. VALVE-1 / 2
Actuator characteristics
For control deviation 50%
Integral action time Tn=7
Actuator characteristics
For control deviation 25%
Integral action time Tn=7
Action time (min)
I-band
Adjustment time
10 - 30 min
6 -10 min
3 -6 min
Parameter
PARAMETER 18
PARAMETER 19
PARAMETER 20
PARAMETER 21
PARAMETER 22
8-33