Kanardia miniDaqu, Руководство пользователя, Страница: 48 / 53

9.7 Rotor RPM miniDaqu — Manual
Option Selection/Setting
Channel Any E or F
Function Pitch trim
Sensor Linear 5 V
Report time 0.2 – 0.5 s
Filter about 0.5 s
Table 17: An example configuration for pitch trim sensor connected as variable
voltage divider.
Some displays (e.g. Nesis, Aetos) show popup windows showing trim or flap
position, when system detects that a trim or flaps are moving. In this case,
time of travel between both limiting values is also important.
Please refer to appropriate display manual for the details.
9.7 Rotor RPM
Active inductive sensors are most oftenly used for rotor RPM sensors. They
either detect holes in metal or count teeth producing pulses..
Connection schematics were already given in section 3.7. Two schematics
were given, one for NPN sensor, Figure 10 and the other for PNP sensor,
Figure 11.
Let’s assume that sensors is applied to a rotor and it is counting teeths in
the rotor head. There are 72 teeth for one RPM, which equals to 72 pulses.
Table 18 shows appropriate settings for this assumption. Your case will be
probalby have a different number of pulses.
See also section 1.5.2 for more information about channel limitations.
Since software version 3.6 pulses per revolution can be combined with a reduc-
tion ratio. In most circumstances this value shall be set to 1.0, which means
no reduction – direct drive.
In cases where sensor is not installed on the rotor head, but on the drive
train with some fixed reduction ratio, this option comes handy. Set pulses
according to the drive train revolution and then also set the reduction ratio
of the drive train.
©
Kanardia 2019-2022
46