Parameters
WE
Range of values
Room temperature set point
22 °C
0 to 40 °C
K
P
0.5
0.1 to 99.9
T
N
60 sec 1 to 999 sec
T
V
– – –
– – – to 999 sec
5.1.5 Room temperature cascade control
4
The sensor input F5 is the control variable input for the room temperature and the sensor
input F1 is the control variable input for the supply air temperature by default. Alterna-
tively, the room temperature can also be guided over the analog input AE3 and the sup-
ply air temperature over the analog input AE1 to the controller.
The room temperature control loop is implemented as a P control loop with adjustable
Room temperature set point and K
P
Temperature master loop. The supply air temperature
is controlled by a PID control algorithm with adjustable
Temperature set point of the slave
loop. Depending on the system code number, the temperature control loop has between 1
and 3 sequence outputs that are adapted to the dynamics of the corresponding system
components by means of the
K
P
, T
N
and
T
V
control parameters. The parameters -
Supply
air temperature minimum limit and Supply air temperature maximum limit - restrict the set
point shift which arises when the room temperature control loop takes influence on the
supply air temperature control loop: each deviation in room temperature by the amount
x causes a shift of the supply air temperature set point by the amount x multiplied by the
parameter
K
P
Temperature master loop.
4
x =
Room temperature set point – Room temperature actual value
4
Supply air temperature set point
calculated
=
Supply air temperature set point + x · K
P
Temperature master loop
Note!
If the calculated set point is not within the limit, the minimum or maximum limit applies as
the new set point.
Shifts in the set point which are caused by manual set point correction, return air tempera-
ture limit, summer compensation or by condensation detection, have unrestricted effects on
the room temperature set point.
Functions
WE
Configuration
Control method
Room cascade control (–> page 17)
Sensor F1, supply air temperature
or
assignment of inputs AE1 to AE4
OFF
Fb1 = ON or
Fb18 = ON,
option:
AE1F1
Sensor F5, room temperature
or
assignment of inputs AE1 to AE4
OFF
Fb5 = ON or
Fb18 = ON,
option:
AE3F5
40
EB 5477 EN
Control methods and system components