Siemens SINAMICS V90 Operating Manual page 80

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Taking the second referencing mode as an example, you can configure relevant
parameters on the following panel:
Assign signals REF and SREF(for more information, see Section "Configuring
inputs/outputs (Page 75)"). Click
appears:
Click
80
Parame- Value Referencing mode
ter
4 External reference
cam (CWL signal)
and encoder zero
mark
to start referencing and the following window appears:
Illustration
and the following warning
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Operating Manual, 04/2017, A5E36618042-003