Heinzmann E-LES 30, Manual

Page: 19 / 106

3 Sensors
KRONOS 20
11
3.2.2 Mounting Position
The mounting position of the speed pickup must be such as to allow a frequency as high
as possible. The HEINZMANN digital control of the KRONOS 20 series is normally
designed for a frequency of max. 9,000 Hz. Frequency may be calculated as follows:
f
(Hz) =
n z ( / min) * 1
60
z = number of teeth on impulse wheel
Example:
n = 1,500
z = 160
f =
60
160 * 1500
= 4,000 Hz
In addition, attention should be paid that the sensor can pick up the speed
without alteration, e.g. by being mounted on the starter gear of the flywheel.
The pickup wheel must be made of magnetic material (e.g. steel or cast iron).
3.2.3 Tooth Shape
Tooth shape is optional. The top width of the tooth should be 2.5 mm minimum, the
width and depth of the gap at least 4 mm. For a perforated disk the same measurements
apply.
A radial position of the speed pickup is preferable for tolerance reasons.
3.2.4 Distance of the Speed Pickup
Distance of the speed pickup to the top of the teeth should be approx. 0.5 to 0.8 mm.
(the speed pickup can be screwed onto the top of the tooth and screwed back approx.
half a revolution.)
Note