Operation
38
F-FEM-CNT — User’s Guide
4.1.7
Toothed Disk with n-1 Teeth
The method described in chapter Toothed Disk with n-2 Teeth on page 37 can
also be applied for tooth gaps of one tooth. Usually such toothed disks have 35
teeth, where one is missing, but the method is suitable for other tooth counts as
well, and therefore this method is also called "n-1".
The related sensor attribute is called "Freq-1 A-Unsigned".
The minimum speed is 428 rpm, below that the gaps are not detected due to the
limited counter width. This speed limit is based on a 35-1 teeth disk. For a
toothed disk with other teeth count use the frequency value related to the speed
limit to calculate the rpm-limit (in inverse proportion to the tooth count ratio).