SIEMENS
13/22
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 torque 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)
–
1.2 ms
Characteristic angular
frequency -3 dB
–
400 Hz
In this case, the dynamic response is
determined primarily by the encoder system.
Torque ripple
–
1.3 % of
M
0
A ripple of < 1 % is possible with an absolute
encoder
≤
1 rpm.
Not possible with resolver.
Torque accuracy
–
± 1.5 % of
M
0
Measured value averaged over 3 s.
With motor identification and friction
compensation. In torque operating range
up to ±
M
0
.
Speed operating range 1:10 up to rated
speed.
Attention
: External influences such as motor
temperature can cause an additional long-
time inaccuracy (constancy) of about ±2.5 %.
Approx. ±1 % lower accuracy in field-
weakening range.
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)
–
1.6 ms
2.5 ms
1.6 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
–
350 Hz
200 Hz
300 Hz
With encoderless operation in speed
operating range 1:10.
The dynamic response is improved when
using an encoder (feedback signal).
Torque ripple
–
2 % of
M
rated
2.5 % of
M
rated
2 % of
M
rated
With encoderless operation in speed
operating range 1:20, with encoder 20 rpm
and above up to rated speed.
Torque accuracy
–
± 3.5 % of
M
rated
± 2 % of
M
rated
± 1.5 % of
M
rated
Measured value averaged over 3 s.
With motor identification and friction
compensation, temperature effects
compensated by KTY84 and mass model.
In torque operating range up to ±
M
rated
.
Approx. additional inaccuracy of ± 2.5 %
in field-weakening range.
Servo
: Speed operating range 1:10
referred to rated speed.
Vector
: Speed operating range 1:50
referred to rated speed.
1)
AM22DQ: Absolute encoder 22 bit singleturn (resolution 4194304,
encoder-internal 2048 S/R) + 12 bit multiturn (traversing range
4096 revolutions).
© Siemens AG 2017