Siemens SINAMICS S150 - Page 342

SINAMICS S120
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
342/528
Chassis format, pulse frequency 2 kHz, closed-loop speed control
Servo Control Vector Control Notes
Synchronous
motor
1FT7
without encoder
1FT7
with absolute
encoder AM22DQ
1FT7 synchronous motors are not
designed for operation in vector control
mode.
Controller cycle
250 ms 250 ms
Total rise time
(without delay)
– 5 ms
With encoderless operation in speed
operating range 1:10, with encoder from
50 rpm 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
N
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
250 ms 250 ms 250 ms 250 ms
Total rise time
(without delay)
21 ms 8 ms 20 ms 12 ms
With encoderless operation in speed
operating range 1:10, with encoder from
50 rpm up to rated speed.
Characteristic
angular frequency -
3 dB
25 Hz 80 Hz 35 Hz 60 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
N
0,05 × f
slip
£ 0,001 % of n
N
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".
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 Notes
< 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