Fan Control - Siemens RDF301 Basic Documentation

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
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Siemens
Building Technologies
3.8

Fan control

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