West Control Solutions KS98-1 - Manual (Page 228)

III-16.4 Control behaviour
The following chapter describes the different control behaviours adjustable with the configuration parameter CFUNC
and determines the parameters effective then.
All available parameters can be adjusted in the engineering tool. However it is not recognizable, which of the adjusted
values are really affectingthe process.
The following compilation shall help to enlighten, which parameters are really used, dependent from the adjusted con -
troller type. Therefore the relevant parameters for control behaviour are accented grey in the tables
Signaller, 1 output
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 , switch-off is always
at a fixed value 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 signal function corresponds to limit signalling, whereby the is the limit value. The trigger point is symmetrical to
the ; hysteresis X
sd1
is adjustable.
Configuration Effective controller parameters of a signaller with one output
CFunc =
signaller,
1 output
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=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 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.
Controller 9499-040-82711
III-228 Control behaviour
Output Y1
Process value
Setpoint
Fig.: 53
Static operating principle of
the signalling function
of a signaller, 1 output