Lenze 9400 - Manual (Page 265)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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6 Encoder evaluation
6.3 Parameter setting
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6.3.12.2 Angular drift monitoring for encoders with absolute information
For an encoder with absolute information, cyclical communication with the encoder takes place and
the angle is read out digitally. This angle is compared to the angle from the encoder evaluation.
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Note!
If monitoring is deactivated ( C00621 ="0: No response"), there is no cyclic
communication with the encoder, and therefore no communication errors with the
encoder can occur.
If monitoring is activated, it is only executed for speeds lower than 100 rpm due to
runtimes for communication.
• If increments get lost at higher speeds, this deviation can only be recognised when the
speed falls below 100 rpm for at least 80 ms.
After each detected encoder angular drift error, a renewed read-out of the position is
tripped automatically and this angle is written into the encoder evaluation. This makes
it possible to acknowledge the error. In case of synchronous machines, the pole position
is corrected simultaneously.