West Control Solutions KS 45 - Manual (Page 25)

6.3 Filter
Input values can be smoothened with an 1st order mathematical filter. Time constant is adjustable.
6.4 Substitue value for inputs
If a substitute value for an input is activated, this value is used for further calculation with a sensor fault, independent
of the selected input function. The selected controller output reaction on sensor fault, configuration FAIL, is omitted.
With factory setting, the substitute value is switched off.
a
Before activation of a substitute value In.F, the effect on the control loop must be considered.
6.5 Input forcing
Setting f.AIx = 1 (only via BlueControl
®
) can be used for configuring the input for value entry via the interface (=forc -
ing).
a
Please, check the effect on the control loop in case of failure of input value / communication and
exceeded measuring range.
6.6 O
2
measurement (optional)
This function is available only on instrument versions with INP2 .
Lambda probes (
l probes) are used as input signals. The electromotive force (in volt) delivered by lambda probes is de-
pendent on the instantaneous oxygen content and on the temperature. Therefore, the device can only display accurate
measurement results, if the probe temperature is known.
The instrument calculates the oxygen content according the Nernst formula.
Distinction of heated and non-heated lambda probes is made.
Signals from both types can be handled by the device.
Heated lambda probes
Heated
l probes are fitted with a controlled heating, which ensures a continuous temperature. This temperature must
be specified in parameter Probe temperature in transmitter CI 45.
Parameters
® Functions ® Pro be temperature tEmP ® ...°C (/°F/K - dependent on configuration)
Non-heated lambda probes
When the probe is always operated at a fixed, known temperature, the procedure is as with a heated probe.
A non-heated
l probe is used, if the temperature is not constant. In this case, the temperature in addition to the
probe mV value must be measured. For this purpose, any temperature measurement with analog input INP2 can be
used. During function selection, input INP2 must be set for measurement (
CONF/InP.2/I.Fnc=1).
Configuration:
O
2
-measurement must be adjusted in function 1 :
Func r Fnc.1 7
O2-measurement with constant probe temperature (heated
probe)
8
O2-measurement with probe temperature measurement
(non-heated probe)
Connection
Connect the input for the lambda probe to INP1 . Use terminals I and 2.
If necessary, temperature measurement is connected to INP2.
Input 1 is used to adjust one of the high-impedance voltage inputs as sensor type :
Functions
Filter 25 KS 45