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6. Parameterization
FILt: Limitation of the impulse length
For debouncing mechanical contacts via the selection of the filter frequency.
none Special evaluation of the impulse length.
no
2 Hz at duty cycle 1:1 => minimum impulse length 250 ms
2
5 Hz at duty cycle 1:1 => minimum impulse length 100 ms
5
10 Hz at duty cycle 1:1 => minimum impulse length 50 ms
10
20 Hz at duty cycle 1:1 => minimum impulse length 25 ms
20
50 Hz at duty cycle 1:1 => minimum impulse length 10 ms
50
100 Hz at duty cycle 1:1 => minimum impulse length 5 ms
100
500 Hz at duty cycle 1:1 => minimum impulse length 1 ms
500
PPt: Impulses per revolution
The number of impulses per revolution can be entered directly via this parameter. As a rule, gears
and their number of teeth, incremental encoders with their resolution or disks with a number of
bores are used here. In the case of simple flow meters with paddlewheel, only the number of
impulses per liter or cubic meter is entered.
tIME: Time base
The time base is usually always „MIn" for the rotation speed, but can also be changed to seconds
and hours.
dot: Decimal point / Decimal place
The decimal point determines the decimal representation of the display value. Thus, a rotational
speed can be displayed with up to 3 decimal places if it is small enough.
Example: Rotational speed measurement
The rotational speed of a roll in a steel mill is to be displayed in revolutions/minute with one
decimal place. Via a perforated disc with 18 holes at an angle of 20°, the rotational speed is
recorded. The maximum rotational speed of the roller is 60 revolutions per minute. Thus, the
customer provides e.g.. FILt = 100; PPt = 18; tIME = MIn; dot = 0,0 on. The challenge with the
filter setting is to estimate the impulse length correctly.
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