Siemens SINAMICS S150 Operating Instructions Manual page 179

Supplementary conditions and recommendations
● Recommendation for the number of DDS in a drive
● Max. number of DDS for one drive object = 32 DDS
EDS: Encoder data set
An encoder data set contains various adjustable parameters describing the connected
encoder for the purpose of configuring the drive.
● Adjustable parameters, e.g.:
The parameters that are grouped together in the encoder data set are identified in the
SINAMICS parameter list by "Data Set EDS" and are assigned an index [0..n].
A separate encoder data set is required for each encoder controlled by the Control Unit. Up
to 3 encoder data sets are assigned to a drive data set via parameters p0187, p0188, and
p0189.
An encoder data set can only be changed using a DDS changeover.
Each encoder may only be assigned to one drive and within a drive must - in each drive data
set - either always be encoder 1, always encoder 2 or always encoder 3.
One application for the EDS changeover would be a power component with which several
motors are operated in turn. A contactor circuit is used to changeover between these motors.
Each of the motors can be equipped with an encoder or be operated without an encoder
(sensorless). Each encoder must be connected to its own SMx.
If encoder 1 (p0187) is changed over via DDS, then an MDS must also be changed over.
One drive object can manage up to 16 encoder data sets. The number of encoder data sets
configured is specified in p0140.
When a drive data set is selected, the assigned encoder data sets are selected
automatically.
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
The number of DDS in a drive should correspond with the number of switchover options;
in other words
p0180 (DDS) ≥ p0130 (MDS).
– Encoder interface component number (p0141)
– Encoder component number (p0142)
– Encoder type selection (p0400)
6.3 Basic information about the drive system
Operation
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