Behaviour of new version?
The previous marked variation of the speed value read in via DFIN does not occur any longer.
Which products are affected?
ECS axis module B-SW V3.0
What happens?
The speed signal of the feedback (encoder / resolver) alternately indicates too large and too low values in the task cycle. The variation depends on the task in which DFIN and MCTRL are processed. In case of a 1 ms task the variation amounts to approx. 1/8, in a 2 ms task it is approx. 1/16 of the speed etc. The correct speed value corresponds to the average.
When does the problem occur?
Sporadically.
Possible diagnostics?
Use the Global Drive Oscilloscope for recording purposes. The monitor box in GDC is not suitable for evaluation purposes!
Short-term measures/recommendations?
None.
Evaluation:
Not critical with regard to safety technology aspects. However, the variations affect the runability in a negative way.
Published with service message No. 2004/26 and 2004/27
