Siemens RDF301.50 Series Basic Documentation

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Siemens
RDF301, RDF301.50..., RDF600KN
Building Technologies
3.8
Fan control
The fan operates in automatic mode or at the selected speed with manual mode.
In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When t
closes and the fan switches off or stays at fan
parameters
kick).
Factory setting for "Fan in
∂
RDF600KN
∂
RDF301…:
1)
P15 is not implemented into RDF600KN SW
2)
On RDF301 and RDF301.50, it is recommended that the fan is running in
deadzone, i.e. P60=0,
sensor.
The fan speed and mode can be changed
For this purpose
The fan speed and mode can be monitored via bus.
The individual switching points for
control parameters P55
switch
on point. The
control.
Y
H
[%]
100
The diagram only shows the PI
O
n applications with 2
1)
The switching point for low fan speed (Q1) is synchronized to the heating
cooling output. Parameter
2)
The maxim
switching differential (SDH/SDC) via a look
Q
Q3
Q2
Y
1
0
Note:
Fan command value
Enable fan command
value
Fan operation
Fan stage 1-2-3
Fan output
3-speed fan control
with modulating
heating / cooling
control
Note:
3-speed fan control
with ON/OFF heating /
cooling control
RDF301, RDF301.50..., RDF600KN
, RDF600KN/S Basic D
ocumentation
Fan control
The fan operates in automatic mode or at the selected speed with manual mode.
In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When t
he room temperature reaches the setpoint, the control valve
closes and the fan switches off or stays at fan
speed 1 according to the setting of
parameters
P15
1)
(fan stage in dead zone Comfort on
RDF600KN) and P60 (fan
Factory setting for "Fan in
the dead zone":
RDF600KN
:
Fan speed OFF: (P15 = 0, P60 = OFF)
RDF301…:
Fan speed 1 (P60 = 0)
2)
P15 is not implemented into RDF600KN SW
version < V1.
On RDF301 and RDF301.50, it is recommended that the fan is running in
deadzone, i.e. P60=0,
or using a return air-
or external temperature
sensor.
The fan speed and mode can be changed
via bus.
For this purpose
,
the fan command value needs to be enabled.
The fan speed and mode can be monitored via bus.
The individual switching points for
ON
of each fan stage can be adjusted via
control parameters P55
…P57. The fan speed switch
off point is
on point. The
diagrams below show
fan speed control for
w
XpH
Y
C
[%]
Q
Q3
Q2
Q1
0
0
XpC
100
x
dz
w
Room temperature setpoint
Q
Fan speed
Y
H
Control demand
Y
C
Control demand
XpH
Proportional band
XpC
Proportional band
X
dz
Dead zone
The diagram only shows the PI
thermostat
’s proportional part.
n applications with 2
-position control:
The switching point for low fan speed (Q1) is synchronized to the heating
cooling output. Parameter
"
Switching point fan speed low
The maxim
um switching range of the fan (XpH
Fan
/ X
pC
switching differential (SDH/SDC) via a look
-up table.
Cool
T[癈]
w
x
dz
SDC
SDH
T[°C]
Room temperature
w
Room temperature setpoint
Q
Fan speed
Y
Control command
SDH
Switching differential
SDC
Switching differential
X
dz
Dead zone
XpH
Fan
Switching range for fan
"Heating"
ocumentation
CE1P3171en
2017-12-07
The fan operates in automatic mode or at the selected speed with manual mode.
In automatic mode, the fan speed depends on the setpoint and the current room
he room temperature reaches the setpoint, the control valve
speed 1 according to the setting of
RDF600KN) and P60 (fan
Fan speed OFF: (P15 = 0, P60 = OFF)
version < V1.
8.
On RDF301 and RDF301.50, it is recommended that the fan is running in
or external temperature
the fan command value needs to be enabled.
of each fan stage can be adjusted via
off point is
20% below the
fan speed control for
modulating PI
Room temperature setpoint
Fan speed
Control demand
"Heating"
Control demand
"Cooling"
Proportional band
"Heating"
Proportional band
"Cooling"
Dead zone
’s proportional part.
The switching point for low fan speed (Q1) is synchronized to the heating
/
Switching point fan speed low
" P57 is not relevant.
pC
Fan
) is defined by the
Room temperature
Room temperature setpoint
Fan speed
Control command
"Valve"
Switching differential
"Heating"
Switching differential
"Cooling"
Dead zone
Switching range for fan

Siemens RDF301.50 Series Specifications

General

Brand	Siemens
Model	RDF301.50 Series
Category	Thermostat
Language	English