Siemens Building Technologies
CM2N3204E / 05.2001
Landis & Staefa Division
3/20
•
Room-supply air temperature or extract air-supply air temperature cascade control.
Connection of the room or extract air temperature sensors (terminal B1) and supply
air temperature sensors (terminal B2) automatically activates cascade control. With
cascade control, the room or extract air temperature is maintained at a constant level.
The room or extract air temperature represents the controlled variable whose setpoint
can be read and adjusted on the controller’s second operating level. The supply air
temperature is shifted in dependence of the deviation of the room/extract air
temperature from the setpoint of room/ extract air temperature. The extent of setpoint
shift is calculated via cascade authority (adjustable from 0 to 20).
– Room supply air temperature or extract air supply air temperature cascade control
with fixed supply air limitations
(mode of control 1).
If the supply air temperature drops below the limit set on the controller, the
integrated minimum limitation takes over control and prevents the supply air
temperature from dropping farther.
The set limit is maintained at a constant level. The same considerations apply to
maximum limitation.
– Room-supply air temperature or extract air supply air temperature cascade control
with shifting supply air limitations (displacement ventilation)
(mode of control 2).
The shifting limits of the supply air temperature are calculated in dependence of the
actual room or extract air temperature, whereby the supply air temperature must
remain within the boundaries dictated by the selected values of minimum and
maximum limitation.
•
Supply air temperature control
(mode of control 3)
.
If a supply air temperature sensor (terminal B2) is connected, supply air temperature
control is automatically activated. With this mode of control, the supply air
temperature is maintained at a constant level.
The required mode of control can be selected.
The RWI65.02 is a sequence controller with three modulating outputs (Y10 = heating,
Y20 = cooling, Y30 = HR) and one switching output
(
Q13 / Q24 = cooling). It allows for
control sequences using both operating actions, for dampers and HR equipment. Both
operating action and control sequences are adjustable (DIL switches no. 4 to 7).
100
Y30
min
Y10
/Y30
Y30
/Y10
Y20
SA
SD
T
w
h
w
c
X
P1
T
n1
X
P3
T
n3
X
P2
T
n2
Y
[ % ]
32
04
D
0
3E
(DtPnt 33)
(DtPnt 32)
(DtPnt 6)
The basis used for compensation are the setpoints selected on the controller. These
basic setpoints can be shifted as follows:
•
Compensation of the controller setpoint in dependence of the outside temperature
(terminal B4); with this function, summer/winter compensation is integrated in the
controller; the compensation characteristic is adjustable
•
Compensation by means of an active or passive setting unit, either as an absolute
setpoint or in the form of setpoint shifting via signal input "Z"
•
Compensation across the entire setpoint range from an L&S building automation
system via the FLN bus, LON / BACnet bus or LPB bus communication card,
depending on the respective system
Temperature control
Control sequences and
operating action
Function diagram
Setpoint compensation
