Referencing; Referencing Methods - Siemens SINAMICS G120D Operating Instructions Manual

7.6.7

Referencing

7.6.7.1

Referencing methods

Overview
If you are using an incremental encoder for the position actual value, after the supply voltage
is switched off, the converter loses its valid position actual value. After the supply voltage is
switched on again, the converter no longer knows the reference of the axis position to the
machine.
Referencing re-establishes the reference between the zero point of the position calculated in
the converter and the machine zero point.
Absolute encoders retain their position information, even after the supply has been switched
off.
The converter offers various ways of referencing the axis:
● Reference point approach - only with incremental encoders
● Flying referencing - with all encoder types
● Set reference point - with all encoder types
● Absolute encoder adjustment - with absolute encoders
Reference point approach
The converter automatically traverses the axis to a defined reference point.
Example: A workpiece must be positioned at a start-
ing point before machining starts.
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
Advanced commissioning
7.6 Basic positioner and position control
185