The minimum possible sampling time is always 250 μs.
This time can be extended for SSI encoders, e.g. with long telegram lengths and
low clock frequencies. (Chapter 6.1.6.6 The digital data word)
For more information about scan time, see chapter6.1.4 Scan time snd speed fluc-
tuations
Speed filter ec27 speed PT1-time
The filter time of the PT1 filter for the speed calculation is adjusted with this param-
eter.
The PT1 filter time should not be higher than the half scan time. If ec26 = 5 "2ms“
is selected, then ec27 should be set to 1ms.
6.1.6.4 Gear factor
A gear factor can be adjusted with ec24 and ec25, which takes effect on all posi-
tion and speed calculations of the encoder interface before the position and speed
are internally transmitted to the control.
The position before the gear factor is displayed in ru38.
The displayed values in the speed parameters (e.g. ru08 / ru09) or position param-
eters (e.g. ru33) include already the gear conversion factor, except for ec31 and
ec33.
If the number of motor revolutions is adjusted in ec24 gear numerator and the num-
ber of speed encoder revolutions in ec25 gear denominator, then the position and
speed related to the motor shaft is displayed in the inverter parameters.
Gear factor numerator ec24 gear numerator
Position and speed are multiplied with this value.
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