Siemens SINAMICS S120 Function Manual page 266

Function modules
7.9 Basic positioner
Instructions for switching data sets
Using drive data set switching (DDS), motor data sets (p0186) and encoder data sets (p0187
to p0189) can be switched. The following table shows when the reference bit (r2684.11) or
the status of the adjustment with absolute encoders (p2507) is reset.
In the following cases, when a DDS switch takes place, the current actual position value
becomes invalid (p2521 = 0) and the reference point (r2684.11 = 0) is reset.
● The EDS that is effective for the position control changes.
● The encoder assignment changes (p2502).
● The mechanical relationships change (p2503...p2506)
With absolute encoders, the status of the adjustment (p2507) is also reset, if the same
absolute encoder is selected for the position control although the mechanical relationships
have changed (p2503 ... p2506).
In operating mode, an error message (F07494) is also generated.
The following table contains a few examples for data set switching. The initial data set is
always DDS0.
Table 7-5 DDS switch without load gearbox position tracking
DDS p186 p187
(MDS) (encoder_1)
0 0 EDS0
1 0 EDS0
2 0 EDS0
3 0 EDS0
4 0 EDS0
5 1 EDS4
266
p188 p189
(encoder_2) (encoder_3)
EDS1 EDS2
EDS1 EDS2
EDS1 EDS2
EDS1 EDS2
EDS3 EDS2
EDS1 EDS2
Encoder Mecha- Load
for nical gearbox
position
position conditions
control tracking
p2504/
p2502 p2505/
p2506 or
p2503
encoder_1 xxx disabled
encoder_1 xxx disabled
encoder_1 yyy disabled
encoder_2 xxx disabled
encoder_2 xxx disabled
encoder_1 xxx disabled
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Changeover response
---
Switching during pulse
inhibition or operation has
no effect
Pulse disabling: Position
actual value preprocessing
is newly initiated and
1)
reference bit is reset.
2)
Operation:
Error message is
generated. Position actual
value preprocessing is
newly initiated and
1)
reference bit is reset.
2)
Pulse disabling: Position
actual value preprocessing
is newly initiated and
1)
Drive Functions