Comparison of Hiperface and sin/cos position for additional monitoring

In an additional monitoring function for Hiperface absolute value encoders, the digital position (read via Hiperface interface) is cyclically compared to the position resulting from the sin/cos track evaluation in the inverter. If the positions electrically differ by more than 45°, an Sd16 fault will be indicated. The monitoring response is set in C603/8 'Response to Hiperface sin/cos deviation'.
The Hiperface and the sin/cos position are cyclically compared every 128ms as long as the encoder speed is below 100rpm.

The additional monitoring function helps to detect interferences on the analog sin/cos signals which may in the worst case lead to a position drift. The monitoring function is known from the 9400 as 'Encoder angular drift'.