Mechanical System - Siemens SINAMICS S120 Getting Started

Performing basic parameterization
6.3 Drive axes
Virtual multiturn resolution
With a rotary absolute encoder (p0404.1 = 1) with activated position tracking (p0411.0 = 1),
the virtual multiturn resolution (p0412) can be used to enter a virtual multiturn resolution.
This makes it possible to generate a virtual multiturn encoder (r0483) from a singleturn
encoder. The virtual encoder range must be able to be represented via r0483.
When no measuring gearboxes (n = 1) are present, the value in p0421 replaces the actual
number of stored revolutions of a rotary absolute encoder. Increasing this value extends the
position range (see linear axis). When measuring gearboxes are present, this value sets the
resolvable motor revolutions represented in r0483.
Tolerance window
After switch on, the difference between the stored position and the current position is
determined and initiated depending on the following:
● Difference within the tolerance window: The position is reproduced based on the current
encoder actual value.
● Difference outside the tolerance window: Message F07449 is issued.
● The tolerance window is preassigned to the encoder range quadrant, although it can be
changed.
6.3.2.7

Mechanical system

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In the "Mechanical system" screen form, check the settings of the position control and adjust
them if necessary. Depending on the encoder type selected for position control and the
motor encoder, various configurations are displayed for the mechanical system.
The "Position tracking" option allows the load position to be reproduced when using
gearboxes. This option can also be used to extend the position range. The position tracking
of the load gear however, is only relevant for a motor encoder (encoder 1).
Parameterizing encoder selection for position control
An encoder is assigned to the position control during commissioning. This encoder setting is
shown in a drop-down list at the top right in the "Mechanical system" screen form. You can
change the encoder assignment in this screen form before parameterizing the position
control. The following options are available:
1. Select the required encoder in the "Encoder system" (p2502) drop-down list.
– No encoder
– Encoder 1
– Encoder 2
– Encoder 3
2. Enter the motor revolutions for the gear ratio between the motor shaft and load shaft in
the "Number of motor revolutions" (p2504) field.
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"Drive axis > Parameters > Basic parameterization > Mechanical system"
Getting Started, 12/2018, 6SL3097-5AG30-0BP0