Encoder signal oversampling

NAVIGATION: encoder > Encoder signal oversampling

Encoder signal oversampling

Encoder signal oversampling optimizes the accuracy of resolver and SinCos signals. Not applying asynchronous intermediate measurements leads to lesser rounding errors and a generally better quality of encoder signals.

Parameters

P. no.	Designation	Function
P1956	CON_ACT_Ovrs	Encoder signal oversampling. This function applies only to resolver and SinCos signals
(0)	0 1	Oversampling disabled Oversampling enabled
(1)	pmeas	The percentage measuring time for oversampling dependent on the sampling time
(2)	filtershift 4 5 6 7 8	Limit frequency for the oversampling filter 6666 Hz 3333 Hz 1666 Hz 844 Hz 416 Hz
(3)	sourceselect 0 1	Oversampling signal source Oversampling for Sin/Cos signals (X7) Oversampling for resolver signals (X6)

Tabelle: Parameter setting for oversampling

ATTENTION:

When oversampling is enabled, instead of the normal A/D signals the oversampled signals for the encoder specified in parameter 1956[3] are used. In the case of high-track Sin/Cos encoders in particular, the low limit frequency of the oversampling filters may result in quadrant errors. If the oversampling units are used, it must always be certain that the encoder does not dramatically exceed the specified limit frequencies.