Referencing - Siemens SINAMICS G120 Function Manual

3.4.6

Referencing

3.4.6.1 Referencing methods
Overview
If you are using an incremental encoder for the position actual value, after the supply voltage
is switched off, the inverter loses its valid position actual value. After the supply voltage is
switched on again, the inverter 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 inverter and the machine zero point.
Absolute encoders retain their position information, even after the supply has been switched
off.
The inverter 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 inverter automatically traverses the axis to a defined reference point.
Example: A workpiece must be positioned at a
starting point before machining starts.
Basic positioner
Function Manual, 04/2015, FW V4.7 SP3, A5E34257659B AB
Basic positioner
3.4 Commissioning
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