PMA KS 98, Manual

Page: 167 / 246

24.6 Controller behaviour
Signaller, 1 output (not available with PIDMA):
The signaller is suitable for processes with small T
u
and low v
max
.
The advantage is in the low switching frequency. Switch-on is always at a fixed value below the set-point, switch-off is
always at a fixed value above the set-point.
The control variable oscillation band is determined as a result of :
X x
T
T
X v T X
u
g
Sd u Sd 0
= · + = · +
max max
The signal function corresponds to limit signalling, whereby the set-point is the limit value. The trigger point is symmet-
rical to the set-point; hysteresis X
sd1
is adjustable.
Output Y1
Configuration Effective controller parameters of a signaller with one output
CFunc
=
signaller,
1 output
W0
1) Lower set-point limit for Weff
-29 999 ...999 999
W100
1) Upper set-point limit for Weff
-29 999 ...999 999
W2
1) Additional set-point
-29 999 ...999 999
Grw+ 2) Set-point gradient plus
off / 0,001 ... 999 999
Grw-
2) Set-point gradient minus
off / 0,001 ... 999 999
Grw2 2) Set-point gradient for W2
off / 0,001 ... 999 999
N0
Zero offset (only effective with
CType
=ratio controller)
-29 999 ... 999 999
a Factor a (only effective with
CType
=3-element control) -9,99 ... 99,99
Xsd1
1) Signaller switching difference
0,1 … 999 999
Titel
Title of controller page (only display)
16 characters
Einh.X
Process value unit (only display)
6 Zeichen
W int
Internal set-point after transmission of the engineering to KS98
-29 999 ...999 999
1) The values are specified in the process value unit - e.g. [°C, °F, bar, %, etc.]
2) The rate of change must be specified in units /minute (e.g. °C/min).
r see gradient control page 192.
9499 040 50611
Controller
167 Controller behaviour
100%
0%
Y1
Â
Xn100 Xn0 W0 Weff W100
Xeff
Xsd1
Static operating principle
of the signalling function
of a signaller, 1 output
Set-point
process value