SITRANS FM100
A5E48762204-AA page 29
10.6.1.7 Filter factor (delay)
Further suppression of the switching outputs of fluctuating measuring signals can
be achieved by setting the parameter "Filter factor". If this parameter is selected
greater than 0, the switching of the output will be delayed accordingly. The "Supp
direction" parameter determines whether the deceleration is to be effective when
the switching threshold is exceeded or not reached (alternatively in both
directions).
"High" means that the delay is active when the measured value exceeds the
switching threshold, "Down" means corresponding effect when the switching
threshold is undershot.
The measured value must stay continuously below or above the switching
threshold with the count of [SUPPRESSIONFACTOR] before the switching output
will be activated. With this function sporadic limit value overruns can be safely
suppressed.
According to the value of the parameter "filter factor", the response time of the
output generally increases.
Examples of the effect of the switching delay for window and limit function
active
not active
Time
Meas value
Hysteresis
suppression time
suppression direction UP
Time
Hysteresis
suppression time
suppression direction DOWN
Meas value
Treshold
Treshold
suppression time
suppression time
Treshold
Hysteresis
Window function
Lower treshold
Hysteresis
Time
suppression time suppression time
Limit function
suppression direction DOWN
Meas value
Treshold
Hysteresis
Lower treshold
Hysteresis
suppression time
suppression time
suppression direction UP
Meas value
Time
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