Siemens SINAMICS S120 - Page 339

SINAMICS S120
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
339/528
Booksize format, pulse frequency 4 kHz, closed-loop speed control
Servo Control Vector Control Notes
Synchronous
motor
1FK7 with
resolver R14DQ
1FT7
1FK7/1FT7 synchronous motors are not
designed for operation in vector control
mode.
Controller cycle
125 ms 125 ms
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.
Asynchronous
motor
1PH7/1PH8
without encoder
1PH7/1PH8
with incremental
encoder 1024 S/R
1PH7/1PH8
without encoder
1PH7/1PH8
with incremental
encoder 1024 S/R
Controller cycle
125 ms 125 ms 250 ms 250 ms
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 model calculation for the torque-
producing current and rated slip of the
asynchronous motor (induction motor)
as given in table "Typical slip values"
(see below).
With speed operating range 1:50
(vector) or 1:10 (servo) and with
activated temperature evaluation.
Typical slip values for standard and trans-standard asynchronous motors
Motor power Slip values Note
< 1 kW 6.0 % of n
rated
e.g. motor with 1500 rpm: 90 rpm The 1PL6 / 1PH7 / 1PH8 compact
asynchronous motors are very
similar to standard asynchronous
motors with respect to their slip
values.
< 10 kW 3.0 % of n
rated
e.g. motor with 1500 rpm: 45 rpm
< 30 kW 2.0 % of n
rated
e.g. motor with 1500 rpm: 30 rpm
< 100 kW 1.0 % of n
rated
e.g. motor with 1500 rpm: 15 rpm
> 500 kW 0.5 % of n
rated
e.g. motor with 1500 rpm: 7.5 rpm