Siemens Sinamics S120 Function Manual page 344

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Function modules

7.7 Closed-loop position control

Restrictions

● Position tracking cannot be activated for an encoder data set which is used in different

● If an encoder data set is used in one DDS as a motor encoder with position tracking and

● If position tracking is reset in one drive data set, it is also reset in all other drive data sets

● An axis in an inactive drive data set may move by a maximum of half an encoder range

The following table describes what happens on changeover from one DDS to another. A

DDS changeover always starts from DDS0.

An overview of DDS changeover without position tracking load gear can be found in section

"Instructions for data set changeover" in chapter "EPOS - referencing".

DDS changeover with load gear position tracking

drive data sets as encoder1 for different gears. If an attempt is still made to activate

position tracking, fault "F07555 (Drive encoder: Configuration position tracking" will be

displayed with fault value 03 hex.

A check is generally performed to determine whether the load gear is the same in all DDS

in which the relevant encoder data set is used.

In this case, the settings in each of the load gear parameters p2504[D], p2505[D],

p2720[D], p2721[D] and p2722[D] must be identical.

in another DDS as an external encoder, the position tracking starts from the beginning

again, i.e. it behaves in the same way as it would do after a POWER ON.

which contain this encoder data set.

(see p2722: tolerance window).

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

during pulse

operation has no

adjustment and

referencing bit

Position tracking

for EDS0 is no

longer calculated

and must be re-

adjusted when

switching back to

Drive functions

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