Closed-loop control via final control element V2
SERV setting value
No.
Function
50
40
Proportional band X
p
of PI-control with final control element V2
(10...99) (K)
51
240
Reset time t
N
of PI-control with final control element V2
(15...999) (s)
52
1.5
Neutral zone X
sh
of PI-control with V2
If the actual flow temperature value lies within a range of the flow temperature setpoint
±
X
sh
, the
controller will not issue any closing or opening commands.
(0.5...4.9) (K)
53
+2.0
Degree of intervening by controller when reaching the return-temperature limit value.
The secondary flow-temperature setpoint (T
FS2
) of the circuit controlled by V2 is reduced by the value set
for this item for each degree by which the permissible return temperature is exceeded.
(0.0...+ 9.9) (K/K)
or
The flow-temperature setpoint (T
FS2
) of the circuit controlled by V1 is reduced by the value set for this
item for each degree by which the actual return value falls below the permissible return temperature.
(typical application: keeping the return temperature high, usually outside of district heating networks).
(0.0...– 9.9) (K/K)
54
5.0
If the maximum flow rate has been reached or exceeded, the setpoint of the circuit controlled by final
control element V2 is reduced in cycles and the valve is closed progressively. This setting value
determines the rate per minute by which the flow-temperature setpoint is reduced. When the flow rate
falls below its maximum value again, the flow-temperature will again be increased slowly.
(0.0...29.9) (K/min)
55
5
When final control element V2 has been completely closed due to a limiting function, it will remain closed
for the period set here.
(1...59) (min)
56
0.20
Min. pulse duration of the initial OPEN pulse to final control element V2 after it has been completely
closed. The entry is made as a percentage of the running time to the actuator of final control element V2.
(0.00...1.00) (corresponding to 0...100 %)
57
5
If the opening movement of final control element V2 starts from the completely closed position, return
temperature and flow rate min. limitation are not effective during the period set here.
(1...29) (min)
58
0.30
Valve position of valve V2 (as a percentage of the running time of the valve actuator) with activated frost-
protection function. If the flow temp. of the heating circuit controlled by valve V2 falls below 10 ° C, final
control element V2 will be driven to this setting until the flow temperature has reached a value of 20 ° C;
then the valve is closed again.
(0.00...1.00) (corresponding to 0...100 %)
59
0.30
Maximum valve position of V2 in manual mode.
This is the max. value to which valve V2 can be opened in manual operating mode.
(0.00...1.00) (corresponding to 0...100 %)
R
–
39
–
7 000458 003
