SIEMENS
13/20
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)
•
Booksize format, pulse frequency 4 kHz, closed-loop speed control
Servo Control
Vector Control
Notes
Synchronous motor
1FK7
with R14DQ
1)
1FT7
Vector Control is not designed as an
operating mode for 1FK7/1FT7
synchronous motors.
Controller cycle
125
μ
s
125
μ
s
Total rise time (without delay)
3.5 ms
2.3 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
140 Hz
250 Hz
In this case, the dynamic response is
determined primarily by the encoder system.
Speed ripple
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
≤
0.001 % of
n
rated
≤
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
125
μ
s
125
μ
s
250
μ
s
250
μ
s
Total rise time (without delay)
12 ms
5 ms
20 ms
10 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
40 Hz
120 Hz
50 Hz
80 Hz
With encoderless operation in speed
operating range 1:10.
The dynamic response is enhanced by an
encoder feedback.
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-producing current and rated slip of the
induction motor (
see table "Typical slip
values"
).
With speed operating range 1:50 (Vector) or
1:10 (Servo) and with activated temperature
evaluation.
1)
R14DQ: Resolver 14 bit (resolution 16384, internally 2-pole).
© Siemens AG 2017