Siemens SINAMICS S120 Commissioning Manual page 39

Cycle times for U/f control
This following table lists the number of axes that can be operated with a Control Unit in the
U/f control mode. The number of axes is dependent on the current controller clock cycle:
Table 1- 7 Sampling time setting for U/f control
Cycle times [µs]
Current Speed controller
controller
500 2000
Mixed operation of servo control and U/f open-loop control
In mixed operation with servo control and U/f control, one axis in servo control at 125 µs
uses exactly as much computing performance as two axes in U/f control at 500 µs. In
conjunction with servo control, a maximum of 11 axes are permitted (1 servo control plus 10
vector control U/f).
Table 1- 8
Mixed operation of vector control and U/f open-loop control
In mixed operation with vector control and U/f control, one axis in vector control at 250 µs
uses exactly as much computing performance as two axes in U/f control at 500 µs. In
conjunction with vector control, a maximum of 11 axes are permitted (1 vector control plus
10 U/f control).
Table 1- 9
Commissioning Manual
Commissioning Manual, (IH1), 01/2013, 6SL3097-4AF00-0BP3
Drives /
12
Number of axes for mixed servo control operation
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
Number of axes for mixed vector control operation
Number of axes in vector control
6 500 µs
5 500 µs
4 500 µs
3 500 µs
2 500 µs
1 500 µs
0
Number
Infeed
1 [250 μs]
3 62.5 µs
2 62.5 µs
1 62.5 µs
0
3 250 µs
2 250 µs
1 250 µs
0
Preparation for commissioning
1.5 Rules for wiring with DRIVE-CLiQ
Motor / dir.
measuring
systems
- / - 3 [2000 μs]
Number of axes in U/f control
0
2
4
6
8
10
12
Number of axes in U/f control
0
2
4
6
8
10
12
TM/TB
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
500 µs
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