West Control Solutions KS98-1 - Manual (Page 229)

Signaller, 2 outputs
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 , whereas switch-off is al-
ways at a fixed point above the .
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 signalling function provides alarm signalling, whereby the is the limit value. The trigger point is symmetrical to
the ; hysteresis X
sd1
is adjustable.
The signaller with two outputs has an additional “limit contact”. Its difference from the is adjustable in parameter LW
(including polarity sign).
Configuration Effective controller parameters of a signaller with two outputs
CFunc =
Signaller,
2 outputs
W0 1) Lower limit for Weff -29 999 ...999 999
W100 1) Upper limit for Weff -29 999 ...999 999
W2 1) Additional -29 999 ...999 999
Grw+ 2) gradient plus off / 0,001 ... 999 999
Grw- 2) gradient minus off / 0,001 ... 999 999
Grw2 2) 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=3element control) -9,99 ... 99,99
Xsd1 1) Signaller switching difference 0,1 … 999999
LW
1) Trigger point separation of additional contact
OFF = the additional contact is switched off
-29 999 … 999 999
-32 000 = OFF
Xsd2 1) Switching difference of additional contact 0,1 … 999 999
Titel Controller page title (only display) 16 characters
Einh.X Unit of the process value (only display) 6 characters
W int Internal after transmission of the engineering to KS 98-1 -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 261.
9499-040-82711 Controller
Control behaviour III-229
100%
0%
100%
0%
Y1Â
Y2Â
Xn100 Xn0 W0 Weff W100
Xeff
Xsd1
Xsd2
LW
Fig.: 54
Static operating principle
of the signalling function
Signaller, 2 outputs
LW is shown as a negative
value in the example (e.g. -20)
Output Y1
Output Y2
Process value
Setpoint