SIEMENS
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Siemens D 21.4 · 2017
Tools and configuration
Configuration notes
SINAMICS S120 Control Units
13
■
Configuration
(continued)
Fundamental closed-loop control characteristics of SINAMICS S (continued)
•
Blocksize, booksize compact, booksize and chassis, pulse frequency 4 kHz, position control
Servo Control
Vector Control
Notes
Synchronous motor
1FT7
1FK7
Vector Control is not designed as an
operating mode for 1FT7/1FK7
synchronous motors.
Position controller cycle
1 ms
1 ms
Resolution
4.19×10
6
incr./rev.
16384
incr./rev.
Correspondingly better with multi-pole
resolver.
Achievable positioning
accuracy in relation to the
motor shaft
10
5
… 10
6
incr./rev.
4096
incr./rev.
In practice, the resolution must be higher than
the required positioning accuracy by a factor
of 4 to 10. These values are approximate
nominal values only.
• In relation to the motor shaft,
approx.
0.00072 °
0.1 °
Induction motor
1PH8
with AM22DQ
1)
1PH8
with incremental
encoder 1024 S/R
1PH8
with AM22DQ
1)
1PH8
with incremental
encoder 1024 S/R
Position controller cycle
1 ms
1 ms
2 ms
2 ms
Resolution
4.19×10
6
incr./rev.
4096
incr./rev.
4.19×10
6
incr./rev.
4096
incr./rev.
Attainable positioning
accuracy
10
5
… 10
6
incr./rev.
1024
incr./rev.
10
5
… 10
6
incr./rev.
512
incr./rev.
In practice, the resolution must be higher than
the required positioning accuracy by a factor
of 4 to 10. These values are approximate
nominal values only.
Vector is less accurate than servo by a factor
of approximately 2.
• In relation to the motor shaft,
approx.
0.00072 °
0.35 °
0.00072 °
0.7 °
1)
AM22DQ: Absolute encoder 22 bit singleturn (resolution 4194304,
encoder-internal 2048 S/R) + 12 bit multiturn (traversing range
4096 revolutions).
© Siemens AG 2017