Siemens SINAMICS S120, Function Manual

Page: 1029 / 1094

Basic information about the drive system
13.12 System rules, sampling times and DRIVE-CLiQ wiring
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
1029
Note
Restriction for the chassis format
If edge modulation and wobbling are activated simultaneously with p1802 ≥ 7 and p1810.2 =
1 respectively, the quantity structure for vector control is halved. Then a maximum of three
axes at a current controller sampling time of 500 µs, two axes at 400 µs or one axis at 250
µs are permitted.
Cycle times for V/f control
The following table lists the number of axes that can be operated with a Control Unit in the
V/f control mode. The number of axes depends on the current controller sampling time.
Table 13- 17 Sampling time setting for V/f control
Cycle times [µs] Number Motor/dir. measur-
ing systems
TM/TB
Current con-
troller
Speed controller Drives Infeed
500 2000 12 1 [250 μs] - / - 3 [2000 μs]
Mixed operation of servo control and V/f open-loop control
In mixed operation with servo control and V/f control, one axis in servo control at 125 µs
uses exactly as much computing power as two axes in V/f control at 500 µs. In conjunction
with servo control, a maximum of 11 axes are permitted (1 servo control plus 10 vector
control V/f).
Table 13- 18 Number of axes for mixed servo control operation
Number of axes in servo control Number of axes in V/f control
6 125 µs 3 62.5 µs 0 -
5 125 µs - - 2 500 µs
4 125 µs 2 62.5 µs 4 500 µs
3 125 µs - - 6 500 µs
2 125 µs 1 62.5 µs 8 500 µs
1 125 µs - - 10 500 µs
0 - 0 - 12 500 µs