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Device manual
3.16 Process gain P.G
Setting range: 1% to 255%
Process gain of the controlled system P.G =
e.g. P.G = 50%:
P.G = 100%:
P.G = 125%:
The process gain P.G is required for the optimisation of the control parameters. If P.G is unknown, it is
determined automatically during optimisation (see also 3.1 OPt).
In case of non-linear transfer behaviour of the plant the process gain changes with the working point
(e.g. when controlling different setpoints).
3.17 Measured value filter for the process variable PV
Software 1st order low-pass filter with adjustable time-constant Tf for
suppressing interference signals and smoothing fast fluctuations of the
actual value.
Setting range : 0 to 255
At FIL = 0 : no software filter is active
The following assignment applies:
Input:
Tf [s]:
3.18 Behaviour in case of sensor failure for PV
Reaction of the actuator in automatic mode in case of sensor short circuit or sensor break.
Selection:
In case of a transmitter/sensor failure the error message Err (error) appears in the display PV.
Alarm message if alarm A, B or C is configured, independent on the adjusted alarm limit.
After the error is no longer present, the controller automatically returns to the
automatic mode.
3.19 Interlocking the manual/automatic switch over
Selection:
3.20 Direction of effect of the controller
Selection:
W. Bälz & Sohn GmbH & Co.
P.G
∆ PV
= 0,5
∆ Y
∆ PV
= 1,0
∆ Y
∆ PV
= 1,25
∆ Y
255
254
252
10.22
5.10
2.54
0 actuator closes
1 actuator opens
2 actuator persists in its current position
0 Switch over via front keyboard, possible at any time
1 Interlocking the current state, switching to the other mode is not possible
MAn.= -1- in automatic mode: permanent automatic mode
MAn.= -1- in manual mode: permanent manual mode
0 Heating controller: the actuator closes with process variable PV > setpoint SP
1 Cooling controller: the actuator opens with process variable PV > setpoint SP
Koepffstraße 5
D-74076 Heilbronn
Change of the process variable PV
Change of the manipulated variable Y
∆ PV [% of the measuring range of PV]
∆ Y [% of the setting range 0-100]
Changing the valve position ∆Y for 10% causes a change of the process
variable PV of 5%.
Changing the valve position ∆Y for 10% causes a change of the process
variable PV of 10%.
Changing the valve position ∆Y for 10% causes a change of the process
variable PV of 12.5%.
250
240
1.69
0.62
SE.b
dIr
Telefon (07131) 1500-0
6490B / 6490B-y / 6590B
∆ PV
=
∆ Y
FIL
Formula :
Tf = -0.04/ln(input/256)
230 *
220
200
0.37
0.26
0.16
* standard setting
Man
Telefax (07131) 1500-21
Page 22
0
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