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
Zero speed limit:
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).
Speed 1, 2, 3, 4:
Enter in this field the maximum speed value above which the function block output (OVER) will be
0 (FALSE). If the measured speed is less than the set value, the function block output (OVER) will be 1 (TRUE).
Frequency zero speed/Frequency1/Frequency2:
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.
Measurement:
Enter in this field the number of pulses/revolution (in the case of rotary sensor) or μm/pulse (linear sensor)
relating to the sensor used.
Verification:
Enter in this field the number of pulses/revolution (in the case of rotary sensor) or μm/pulse (linear sensor)
relating to the second sensor used.
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.
No Proximity
PNP 3-wire NC
PNP 3-wire NO
NPN 3-wire NO
NPN 3-wire NC
PNP 4-wire NC/NO
NPN 4-wire NC/NO
PNP/NPN 4-wire NC/NC
PNP/NPN 4-wire NO/NO
Threshold number:
It allows you to enter the number of thresholds for the maximum value of speed. Changing this value
will increase/decrease the number of thresholds that can be entered from a minimum of 1 to a maximum of 4. In the case
of thresholds greater than 1, the input pins for the selection of the specific threshold will appear in the lower part of the
function block.
Pitch:
If the Axis Type chosen was linear, this field allows you to enter the sensor pitch to obtain a conversion between
sensor revolutions and distance travelled.
Proximity choice:
It allows you to choose the type of proximity sensor from PNP, NPN, Normally Open (NA) and Normally
Closed (NC), with 3 or 4 wires. (In order to ensure a Performance Level = PLe use a proximity switch type PNP NO: ref.
“Interleaved proximity).
