Page 45 - Keubler Motion Sensors
P. 45
Basics
Encoders Technologies
Ageing compensation Every LED loses some of its luminosity over time. Signals of a new encoder
www.HydroSanatSharif.com
(optical encoders) Without ageing compensation the excellent quality
of the output signals would suffer. The phase shift
of 90° necessary to detect the direction of rotation Product overview
would be lost. This effect however is prevented by Channel A
means of special electronic circuitry. Basics
Benefit: Channel B
The ageing compensation circuit ensures the same
signal, even after many years of operating time.
Signals of an older encoder without ageing compensation
The downtime of machines will be reduced dramati-
cally and the reliability is increased.
Channel A
Channel B
Temperature compensation This circuit ensures that the signal will remain the Benefit:
same over the whole working temperature range. The positioning accuracy of a machine will not be
affected by temperature changes.
Current consumption The typical values for current consumption given in This increase in current is taken into consideration
the catalogue apply for ambient temperature (23°C). when giving the figure for maximum current con-
Because of the temperature compensation, the sumption. The output currents are dependent on the
current consumption of the encoder rises with the user‘s input circuit and are therefore not included in
temperature. the figures given; these should therefore be calcula-
ted and added in.
Short-circuit protection The outputs of all the encoders are short-circuit pro- Benefit:
tected, provided that the supply voltage is correctly Wiring circuit errors during installation that often
wired. If an output is connected by mistake to 0 V occur in the hectic of day-to-day industrial environ-
or +U B or with another output, the device will not ments do not lead to the encoder being permanently
be damaged. As soon as the error is corrected, the damaged.
encoder is ready for use again.
Environmental conditions The environmental conditions in which the encoder Thanks especially to the high-quality technology em-
operates can have a significant influence on its ployed in our encoders, they are particularly suitable
service life, for example for use in harsh environments.
• The ambient temperature Numerous references from our customers, including
• The expected shaft load Bosch, Siemens, Bombardier and from suppliers to
• Soiling and humidity the automotive industry, are proof of this.
• Noise interference
Bearing life All Kübler encoders are designed to ensure that The use of the torque stops and stator couplings
their bearings give a long service life. This is subject that are offered ensure that the shaft load with the
of course to correct installation and to the load hollow shaft encoders as supplied from the factory is
limits for the shaft (shaft encoders) being complied kept very small.
with or, in the case of hollow shaft encoders, being
mounted with the appropriate stator couplings or
torque stops.
The following diagrams show the expected service
life of the shaft encoder bearings depending on the
bearing load. The calculations are based on a mixed
load, where the axial force components are always
half of the radial shaft load.
© Fritz Kübler GmbH, subject to errors and changes. 02/2015 www.kuebler.com 43
