Cooling can also be controlled using an on/off signal which is issued at the binary output
BA4 (–> section 6.11.7). Control of a chiller is likewise possible (–> section 6.11.8).
Functions
WE
Configuration
Operating actionY3
OFF
Fb23
Parameters
WE
Range of values
K
P
Cooling coil
0.5
0.1 to 99.9
T
N
Cooling coil
60 sec 1 to 999 sec
T
V
Cooling coil
– – –
– – – to 999 sec
5.5
Humidifier
The humidifier is controlled in system code number 6 from the control output Y2 and in system
code numbers 8 and 9 from the analog output AA. The allocation of the control output Y2 to
the humidifier shown in the controller display does not apply to system code numbers 8 and 9!
The humidifier control is implemented by a PID control algorithm with the parameters
K
P
Hu-
midifier, T
N
Humidifier and T
V
Humidifier.
The operating action of the control output Y2 can be reversed. The default setting is a humid-
ifier capacity of 0 to 100 % which corresponds to a control signal of 0 to 10 V. By activating
the function block Fb22, the operating action is reversed: a humidifier capacity 0 to 100 %
then corresponds to 10 to 0 V.
The operating action at the analog output AA cannot be reversed.
Function
WE
Configuration
Operating action Y2
OFF
Fb22
50
EB 5477 EN
Control methods and system components
Fig. 19 · Output signals, e.g. in system code number 6 (humidifying and dehumidifying)
Humidifying
Dehumidifying
Control
signal
Cooling
– System dev
- System dev
Control
variable
Heating