The output signal is calculated acc. to the following formula.
out
x
= out
min
+ (x - Ao.Lo)
out
max
- out
min
Ao.Lo - Ao.Hi
The aOlo parameter can be set as higher than aOH, but the output
signal will be then, inversed.
12.4. Set Point Change Rate – Soft Start
The limitation of the temperature accretion rate is carried out
through the gradually change of the set point value. This function is
activated after the controller supply connection and during the change
of the set point value. This function allows to reach softly from the actual
temperature to the set point value. One must write the accretion value
in the sPrr parameter and the time unit in the ramp parameter.
The accretion rate equals zero means that the soft start is disabled.
12.5. Digital Filter
In case when the measured value is instable, one can switch
a programmed low-pass fi lter on. One must set the lowest possible time
constant at which the measured value is stable. A high time constant can
cause the control instability.
A high time constant can cause a control instability. The time constant of
the fi lter filt can be set from 0.2 sec. up to 100 seconds.
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