Operating Instructions
Table Of Contents
- RXB (KNX) applications library
- RXB Description of functions for FC10, FC11, FC12, FC13
- Table of contents
- 1 Introduction
- 2 Definitions / Tools
- 3 Select communication mode
- 4 Applications, parameters
- 5 Room operating modes
- 5.1 Description
- 5.2 Overview
- 5.3 Determine the room operating mode in Desigo (S-mode)
- 5.3.1 Local control of room operating mode via a window contact
- 5.3.2 Central control of room operating mode via input from the Use time schedule
- 5.3.3 Central and local control of room operating modebased on occupancy
- 5.3.4 Central control of room operating mode viathe Room operating mode time schedule
- 5.3.5 Local control of room operating mode with a room unit
- 5.3.6 Local control of room operating mode via the Temporary Comfort mode input
- 5.3.7 Effective room operating mode
- 5.3.8 Desigo examples
- 5.4 Determine the room operating mode with third-party products (S-mode)
- 5.4.1 Local control of room operating mode via the window contact input
- 5.4.2 Central control of room operating mode via the Room operating mode time schedule
- 5.4.3 Central control of room operating mode via the Use and Occupancy time schedules
- 5.4.4 Central and local control of room operating modebased on occupancy
- 5.4.5 Local control of room operating mode with a room unit
- 5.4.6 Local control of room operating mode via the Temporary Comfort mode input
- 5.4.7 Effective room operating mode
- 5.4.8 Third-party (S-mode) examples
- 5.5 Determine the room operating mode with Synco (LTE mode)
- 5.5.1 Local control of room operating mode via the window contact input
- 5.5.2 Central control of the room operating mode via Enable Comfort
- 5.5.3 Central control of room operating mode via Room operating mode input
- 5.5.4 Local control of room operating mode via presence detector
- 5.5.5 Local control of room operating mode with a room unit
- 5.5.6 LTE-Mode Examples
- 5.6 Determine the room operating mode without a bus (stand-alone)
- 6 Setpoint calculation
- 7 Temperature measurement
- 8 Control sequences
- 9 Fan control
- 10 Master/slave
- 11 General and central functions
- 11.1 Send heartbeat and receive timeouts
- 11.2 Digital inputs
- 11.3 Temporary Comfort mode
- 11.4 Presence detector switch-on and switchoff delay
- 11.5 Heating and cooling demand
- 11.6 Heating/cooling signal output
- 11.7 Special functions
- 11.8 Boost heating (Morning Warmup, 2)
- 11.9 Night purge (Night Purge, 4), (FNC10, FNC12)
- 11.10 Precooling (Precool, 5)
- 11.11 Test mode (Test, 7)
- 11.12 Emergency heating (Emergency Heat, 8)
- 11.13 Rapid ventilation (Fan only, 9)
- 11.14 Free cooling (Freecool, 10)
- 11.15 Alarm
- 11.16 Reset the setpoint shift
- 11.17 Free inputs/outputs
- 11.18 Software version
- 11.19 Device state
- 12 Room unit
- 13 KNX information
- 14 FAQs
- 15 Integrate RXB in Desigo/Synco
- 15.1 Case 1: Integration into Synco
- 15.2 Case 2: Integration into Desigo
- 15.3 Case 3: Display in Desigo, with shared Synco time scheduler
- 15.4 Case 4: Display in Desigo/Synco, with shared Synco time scheduler
- 15.5 Case 5: Display in Desigo, andseparate time schedulers
- 15.6 Case 6: Separate display, andseparate time schedulers
- 15.7 Case 7: Separate display, andshared Synco time scheduler
- 16 Working with different tools
124/182
Siemens RXB (KNX) application library RXB Description of functions for FC-10, FC-11, FC-12, FC-13 CM110385en_08
Building Technologies Fan control 2013-06-17
The fan speed is controlled by a PI controller depending on the control deviation of the
valve or reheater.
The fan starts running at the min speed when the valve or reheater demand exceeds
4%; it is deactivated when the demand is 0% (hysteresis).
Control strategy fan in sequence Control strategy fan in parallel
When the valve or/and electric reheater is fully open
AND the room temperature exceeds the fan offset
(P162, P163), the fan output signal grows up to the max.
value (P152, P154).
When the valve or electric reheater passes the fan
starting point (P160, P161), the fan output signal grows
up to the max value (P152, P154) in parallel to the valve
or electric reheater control deviation.
Note: ACS and ETS
For tool architecture reasons, the parameters
P162…P167 are visible but they have no function
In Comfort the min. values for heating and cooling can be defined separately (P153,
P155).
In Pre-comfort, Economy and Protection there is only one min. value for heating and
cooling (P156…P158).
In Comfort, Pre-comfort and Economy mode it is also possible to have the fan
running at min speed in the neutral zone.
• In Comfort mode the hysteresis is between the two min. values (heating, cooling)
and between the heating setpoint and the center of the neutral zone.
• In Pre-comfort and Economy mode, there is no hysteresis because there is only
one min. value.
Function
Sequence
Parallel
Fan speed in dead zone
100%
0%
Fan
Valve
S
maxH
S
minH
Sp
CCmf
Sp
HCmf
S
max
C
TR
S
min
C
Speed
4%
0%
FanStartDmd
Heat
FanStartDmd
Cool
100%
0%
Fan
Valve
S
maxH
S
minH
Sp
CCmf
Sp
HCmf
S
max
C
TR
S
min
C
X
PFanH
Ofs
FanH
X
PFanC
Ofs
FanC
Speed
4%
0%