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Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
11 Function block: Actuator heating circuit
2017-07-24
11.4 Auxiliary variables in interconnected plants
11.4.1 Temperature boost mixing valve
An higher mixing valve temperature can be entered on the controller. This repre-
sents an increase of the respective heating zone's flow temperature setpoint. The
higher setpoint is forwarded to heat generation as the heat demand signal (in own
controller or via data bus).
The increased mixing valve temperature is set on the controller that drives the mix-
ing valve or 2-port valve (controller N2 in the example below) (operating line 84).
Example:
N2
w
N2
w
N1
= w
N2
+ w
25
22
S
0
7
w
N2 +
w
w
N1
Boiler temperature controller (heat generation)
N2
Flow temperature controller (heating zone)
w
N1
Setpoint of boiler temperature controller
w
N2
Setpoint of flow temperature controller
w
Boost of mixing valve temperature (set on controller N2)
11.5 Pulse lock with 3-position actuator
If, during a total period of time equaling 5 times the running time, the 3-position
actuator received only CLOSE or only OPEN pulses, additional CLOSE pulses
sent by the controller will be locked. This minimizes strain on the actuator.
For safety reasons, however, the controller sends a 1-minute CLOSE pulse at
10-minute intervals.
A pulse in the opposite direction negates the pulse lock.