Lenord+Bauer GEL 211CS0 Betriebsanleitung Seite 132

Glossary
BQ value This value is determined from a simulated amplification (positive/nega-
tive) of the amplitude from tooth to tooth that would be necessary to
achieve a constant sine signal for each tooth. The internal controller
module would compensate for mechanical irregularities in the teeth in
this way. This is the case on MiniCODERs with integrated amplitude
regulation, for this reason a gear wheel analysis makes little sense with
this type. The values are displayed as a curve (in magenta).
The BQ value is dependent on the amplitude and offset on the sine sig-
nal. For this reason mechanical calibration of the MiniCODER is imper-
ative prior to the gear wheel analysis.
Vpp curve This curve (in blue) shows the change in the amplitude of the sine sig-
nal from tooth to tooth. From this curve, e.g. it is possible to derive the
concentricity behaviour of the gear wheel: smaller amplitude → larger
air gap and vice versa. In the ideal case there would be a straight line
at the height of the zero line. However, in practice the curve is mostly
like a sine wave; the term "fluctuation" in the sine signal amplitude is
also used.
ΔVpp
This value is given by the difference between the maximum and mini-
mum amplitude for one revolution of the gear wheel.
Standard This value stands for the statistical distribution of the BQ values over
deviation one revolution. A theoretical treatise on this value is not given here.
Based on experience, values between 0 and 10 are acceptable.
ΔBQ
Difference between the extreme BQ values (to be seen as "peaks" on
the BQ value curve)
What affects the error signals?
In general the factors are the same as for the SIN/COS signals: the distance be-
tween the sensor and the target wheel, the size of the gear wheel/the module and
the position (alignment) of the sensor in relation to the gear wheel. Other factors
that have a major effect on the signals are the quality of the gear wheel (concen-
tricity) and the edges on the teeth.
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Lenord+Bauer
GEL 211CS0