1 General Part -- Fundamental control technology terms
Manual
14
SIPART DR21
C73000-B7476-C143-08
D
Two-position controller
The two-position controller (or three-position controller for heating/cooling) is used to activate
relays, contactors or thyristor switches for electric heating or cooling.
-
Two-position controller without feedback
In the simplest version without feedback, two-position controllers operate an on/off
switch. The controllers output is switched if the controlled variable violates the upper or
lower limits of the switching hysteresis (x1 and x2). The controlled variable x is subject to
permanent oscillation whose frequency and amplitude depend on the delay time of the
system and the switching hysteresis of the controller.
1
Controller
2
Controlled system
3
Setpoint adjuster
3
w
xd
1
y
2
x
z
t
t
x
y
x1
x2
w
Command variable
x
Controlled variable
y
Manipulated variable ON/OFF
z
Disturbance variable
On
Off
Figure 1-10 a) Function diagram
b) Switching ouptupt and response of controlled variable
Содержание SIPART DR21
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Страница 148: ...4 Installation 4 2 Electrical Connection Manual 148 SIPART DR21 C73000 B7476 C143 08 ...
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