Siemens RWD62 Manual page 5

Maximum priority
Setpoint compensation
Winter/summer
operation
Day/ night setpoint
Siemens
Building Technologies
X2 Supply air temperature sensor
You can select the PI/PI room/supply air
temperature cascade control. In this case, the
virtual PI room temperature controller determines
the setpoint within the limiter setpoints for the PI
supply air temperature controller.
Maximum priority, cooling
If the value (0...10 V) of the input X2 is greater than
the calculated output of the cooling sequence, the
output will use the X2 input value as output value.
This is active even when the controller is working
with the heating sequence.
The temperature setpoint X1 is shifted by the tem-
perature as measured at sensor X2.
Configuration of the RWD62 defines the influence
on setpoint X1.
The example shows the room air temperature
setpoint as controlled by the outside temperature.
A digital switch or analogue input between termi-
nals X2 and M can be used to implement win-
ter/summer changeover.
Digital changeover
When the contact is closed, summer operation is
selected. Reverse acting output (Y1 only) is set
to direct action (cooling).
Analog changeover
When the X2 input exceeds the setpoint, sum-
mer operation is selected. Reverse acting output
(Y1 only) is set to direct action (cooling).
A contact between terminals D1 and M can be
used to implement setpoint changeover for
day/ night operation.
When the contact is open, the setpoints for day
operation are selected.
When the contact is closed, the setpoints for night
operation are selected.
During the night mode, the following auxiliary func-
tions are disabled: remote setpoint, abso-
lute/relative limiter, setpoint compensation and
maximum priority.
RWD62 Universal controller
Y1 Y2 X2
Y
Temp.
RWD62
X1
Y1 Y2
Y
RWD62
X1
Y1
Y
RWD62
T
Y1 Y2 X2
Y
RWD62
D1 Y1 Y2
Y
RWD62
X1
X2
Temp.
X2
Temp.
X1
Temp.
X1
Temp.
5/10
CE2N3342en
2017-12-05