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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 10 Function block: Actuator heating circuit 15.03.2011
10.2.2 Setpoint increase
t
t
2522D07
T
Vw
T
Vw
T
Vw
Maximum increase: = ––––––––
t
t Time T
Vw
Flow temperature setpoint
t Time unit T
Vw
Setpoint increase per time unit
The rate of increase of the flow temperature setpoint can be limited to a maximum
(heating up brake). In that case, the maximum the flow temperature setpoint can
increase is the set temperature per time unit (°C per hour). This function …
prevents cracking noises in the piping,
protects objects and construction materials that are sensitive to quick tempera-
ture increases (e.g. antiquities),
prevents excessive loads on the heat source.
This function can be deactivated (setting ---).
10.3 Type of actuator
The type of actuator or type of control can be selected via operating line 88:
0 = 2-position control
1 = 3-position control
10.3.1 2-position control
2-position control operates as weather-compensated flow temperature control.
Flow temperature control is provided by the ON/OFF action of the actuating device
(valve). The switching differential required for this type of control can be set via op-
erating line 89.
2474D01
ON
OFF
T
Vw
SD
2
SD
2
T
V
ON Actuator operating
OFF Actuator dead
SD Switching differential (operating line 89)
T
V
Flow temperature
T
Vw
Flow temperature setpoint
43


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