Configuration
Parameter manual
b maXX
BM5800
Document No.: 5.16029.03
Baumüller Nürnberg GmbH
146
3.4
Figure 52:
ProDrive Encoder diagnosis
2. Statical encoder error correction
The encoder signals are subject to tolerances. Therefore, the sinusoidal signals and the
cosine signals are not always conform with an exact sinusoidal function. These toleranc-
es can cause speed vibrations with a frequency of speed*PPR (pulses per revolution).
These tolerances are suppressed by using the automatic statical encoder error correc-
tion. The offset values of the encoder tracks are fit, so that the speed vibrations are min-
imized.
Calculation takes place in speed control. Thereby, the setpoint frequency of speed * PPR
(pulses per revolution) must be constant and they must lie between 30 and 500 Hz.
Measuring checks are made with the circular buffer speed (
) and the sinusoidal
track (
). The measurement at a SinCos HIPERFACE
encoder with 1024 PPR
count in speed control with a set speed of 10 rpm is shown in the following. The relevant
frequency is
f = 10 rpm * 1024 = 170 Hz.
