Absolute Position System - Siemens SINAMICS V90 Getting Started

3 Define LU
4 Calculate the travel
distance per load shaft
revolution
5 Calculate electronic
gear ratio
6 Set param- p29012/p
eters 29013
5.4.6

Absolute position system

When the SINAMICS V90 servo drive uses a servo motor with an absolute encoder. the current absolute position can be
detected and transmitted to the controller. With this function of absolute position system, you can perform motion control
task immediately after the servo system is powered on, which means you do not have to carry out referencing or zero
position operation beforehand.
Restrictions
The absolute position system cannot be configured under the following conditions:
● Internal position control (IPos)
● Speed control (S)
● Torque control (T)
● Control change mode
● Strokeless coordinate system, for example, rotary shaft, infinitely long positioning operation
● Change of electronic gear after referencing
● Use of alarm code output
Getting Started
A5E36037886-003, 04/2017
1 LU=1 μm
6/0.001=6000 LU
(1/6000) / (1/1) × 10000 = 10000/6000
10000/6000 = 5/3
1 LU=0.01
o
360 /0.01 =36000 LU
o o
(1/36000) / (1/3) × 10000 = 10000/12000
10000/12000 = 5/6
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