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8.12 Control signal deactivation
This function protects three-point stepping actuators without final position deactivation from over-
loading by monitoring the total of the control signal pulses. No further control signals are issued if
it exceeds three times the
Valve transit time T
Y
. It is assumed that the control valve is already open
or closed, meaning further control signals do not change the valve position.
Function
WE
Configuration
Control signal deactivation
OFF
Co5 -> Fb16 = ON
8.13 Processing of external demand
The controller (= primary controller) is able to process analog signals for demand.
The external flow temperature set point of the preceding controller is received over the analog
input AE1. 0 to 10 V corresponds to 0 to 120 °C. Demands under a signal of 1 V are sup-
pressed. The received flow temperature set point is compared to the controller’s own flow tem-
perature set point. The higher of both flow temperature set points plus the
Boost parameter is
used for the control.
The
Boost parameter improves the control characteristic of the downstream control valves in the
heating circuit and compensates for any pipeline losses.
Function
WE
Configuration
External demand
OFF
Co5 -> Fb15 = ON
0 °C
Boost / 0 to 30 °C
8.14 Feedforwarding the outdoor temperature
The outdoor temperature can be passed on to another controller over the analog output AA2 (0
to 10 V) by setting Co2 -> Fb05 = ON, provided this output is not used for a control signal or for
the modulation control.
Systems Anl 1 to 3:
The outdoor temperature is constantly applied to AA2. No special settings are necessary. 0 to
10 V corresponds to –40 to 50 °C.
Systems Anl 4 to 6:
Function
WE
Configuration
Continuous RüL-RK2
OFF
Co2 -> Fb05 = OFF
EB 5474 EN
59
System-wide functions
Содержание TROVIS 5474
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Страница 80: ...System Anl 5 System Anl 6 80 EB 5474 EN Electrical connection...
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