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)
•
Chassis format, pulse frequency 2 kHz, closed-loop speed control
Servo Control
Vector Control
Notes
Synchronous motor
1FT7
without encoder
1FT7 with
AM22DQ
1)
Vector Control is not designed as an
operating mode for 1FT7 synchronous
motors.
Controller cycle
250
μ
s
250
μ
s
Total rise time (without delay)
–
5 ms
With encoderless operation in speed
operating range 1:10, with encoder 50 rpm
and above up to rated speed.
Characteristic angular
frequency -3 dB
–
100 Hz
In this case, the dynamic response is
determined primarily by the encoder system.
Speed ripple
–
See note
Determined primarily by the total mass
moment of inertia, the torque ripple and
especially the mechanical configuration.
It is therefore not possible to specify a
generally applicable value.
Speed accuracy
–
≤
0.001 % of
n
rated
Determined primarily by the resolution of the
control deviation and encoder evaluation in
the converter.
This is implemented on a 32-bit basis for
SINAMICS.
Induction motor
1PH8
without encoder
1PH8
with incremental
encoder 1024 S/R
1PH8
without encoder
1PH8
with incremental
encoder 1024 S/R
Controller cycle
250
μ
s
250
μ
s
250
μ
s
250
μ
s
Total rise time (without delay)
21 ms
8 ms
20 ms
12 ms
With encoderless operation in speed
operating range 1:10, with encoder 50 rpm
and above up to rated speed.
Characteristic angular
frequency -3 dB
25 Hz
80 Hz
35 Hz
60 Hz
For encoderless operation in speed operating
range 1:10. The dynamic response is
improved when using an encoder (feedback
signal). Servo with encoder is slightly more
favorable than Vector with encoder, as the
speed controller cycle with Servo is quicker.
Speed ripple
See note
See note
See note
See note
Determined primarily by the total mass
moment of inertia, the torque ripple and
especially the mechanical configuration.
It is therefore not possible to specify a
generally applicable value.
Speed accuracy
0.1 ×
f
slip
≤
0.001 % of
n
rated
0.05 ×
f
slip
≤
0.001 % of
n
rated
Without encoder: Determined primarily by the
accuracy of the calculation model for the
torque-generating current and rated slip of
the induction motor (see table "Typical slip
values").
For a speed operating range 1: 50 (Vector) or
1:10 (Servo) and with active temperature
evaluation.
1)
AM22DQ: Absolute encoder 22 bit singleturn (resolution 4194304,
encoder-internal 2048 S/R) + 12 bit multiturn (traversing range
4096 revolutions).
© Siemens AG 2017