Siemens SINAMICS S120 Function Manual page 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]
Current con- Speed controller
troller
500 2000
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
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drives
12
Number of axes in servo control
6 125 µs
5 125 µs
4 125 µs
3 125 µs
2 125 µs
1 125 µs
0 -
13.12 System rules, sampling times and DRIVE-CLiQ wiring
Number
Infeed
1 [250 μs]
3 62.5 µs
- -
2 62.5 µs
- -
1 62.5 µs
- -
0 -
Basic information about the drive system
Motor/dir. measur-
ing systems
- / -
Number of axes in V/f control
0
2
4
6
8
10
12
TM/TB
3 [2000 μs]
-
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
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