Siemens SINAMICS S120 Function Manual page 394

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Basic functions

8.23 Position tracking

The position can only be reproduced if, in the powered-down state, the encoder was moved

through less than half of the range that it can represent. For the standard EQN1325 encoder,

this is 2048 revolutions or half a revolution for singleturn encoders.

The ratio stamped on the gear rating plate is often just a rounded-off value (e.g. 1:7.34). If, for

a rotary axis, it is not permissible to have any long-term drift, then the actual ratio of the gear

teeth must be requested from the gear manufacturer.

Note regarding using synchronous motors with a measuring gear

Field-oriented control of synchronous motors requires a clear reference between the pole

position and encoder position. This reference must also be carefully maintained when using

measuring gears: This is the reason that the ratio between the pole pair number and the

encoder revolutions must be an integer multiple ≥ 1 (e.g. pole pair number 17, measuring gear

4.25, ratio = 4).

Function diagrams (see SINAMICS S120/S150 List Manual)

Overview of important parameters (see SINAMICS S120/S150 List Manual)

● p0402[0...n]

● p0411[0...n]

● p0412[0...n]

● p0413[0...n]

● p0421[0...n]

● p0432[0...n]

● p0433[0...n]

Encoder evaluation - Position and temperature sensing, encoders 1 ... 3

Gear unit type selection

Measuring gear configuration

Measuring gear, absolute encoder, rotary revolutions, virtual

Measuring gear, position tracking tolerance window

Absolute encoder rotary multiturn resolution

Gear factor encoder revolutions

Gear factor motor/load revolutions

CO: Measuring gear, position difference

CO: Measuring gear, raw encoder value, incremental

CO: Measuring gear, raw encoder value, absolute

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions