Specifications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 07/18
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CERTUS Installation Manual
Gear Ratio:
This parameter is active if there are two sensors on the selected axis. This
parameter allows you to enter the ratio between the two sensors. If both sensors are on the
same moving parts, the ratio will be 1 otherwise the number corresponding to the report must
be entered. E.g. there are an encoder and a proximity switch, and the latter is on a moving
part that (due to a gear reduction ratio) rotates at twice the speed of the encoder. Therefore,
this value must be set at 2.
Hysteresis (%):
It represents the percentage hysteresis value below which the speed change
is filtered. Enter a value other than 1 to avoid continuous switching as the input changes.
High speed:
Enter in this field the maximum speed value above which the output of the function block
(ZERO) will be 0 (FALSE). If the measured speed is less than the set value, the output (ZERO)
of the function block will be 1 (TRUE).
Low speed:
It shows the maximum calculated frequency values fM and fm (decreased by the
hysteresis set). If the displayed value is GREEN, the calculation of frequency gave a positive
result.
If the displayed value is RED, it is necessary to change the parameters given in the following
formulas.
1. Rotary axis, rotary sensor. The frequency obtained is:
v]
[pulses/re
solution
Re
60
[rev/min]
rpm
[Hz]
f
2. Linear axis, rotary sensor. The frequency obtained is:
v]
[pulses/re
Re
[mm/rev]
*
60
1000
*
[m/min]
[Hz]
solution
pitch
speed
f
3. Linear axis, linear sensor. The frequency obtained is:
[µm/pulse]
solution
Re
1000
*
[mm/s]
speed
[Hz]
f
4.
Hysteresis. To be changed only if: fM=green; fm=red
Proximity choice:
KEY:
f = frequency
Rpm = rotational speed
Resolution = measurement
