Siemens SINAMICS S120 - Page 1029

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