Baumuller b maXX BM2500, Руководство по эксплуатации

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Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
163
of 820
4
4.4.6.1 Encoder monitoring
Monitoring of signal amplitude Sin² + Cos²
The controller evaluates the present total amplitude from the sine and cosine traces of the
encoder (Am in
Z
Fig. 80
–
). At error free operation the sum of the quadrants of the sine
and cosine measuring values is nearly constant. However the signal level is not always
constant, in particular there is a dependence of the angle speed and consequently from
the speed.
The levels for the monitoring of the sin² +cos² value can be set in the parameter
Z
14.1
–
and
Z
14.2
–
.
Figure 80: Sine/Cosine traces and instantaneous amplitude of the encoder signal
Sector monitoring
The sector sequence at the sampling of the encoder traces (sine or cosine signal) is an-
alyzed at this monitoring. Here it is assumed that the sampling rate is at least 4 times the
signal frequency and therefore each quadrant of a signal period is at least sampled once.
Monitoring of square-wave incremental encoder
The levels of the encoder signal are monitored separately at a square-wave incremental
encoder, because a monitoring of the amplitude using sin² +cos² is only restricted possi-
ble. The zero trace (zero pulse) is not monitored.