Siemens SINAMICS S120 - Control Properties of the CU320-2 Control Unit

SINAMICS S120
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
338/528
6.2.3 Control properties of the CU320-2 Control Unit
Booksize format, pulse frequency 4 kHz, closed-loop torque 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)
0.7 ms 0.5 ms
At a speed operating range from 50 rpm
for resolver.
Characteristic
angular frequency
-3 dB
650 Hz 900 Hz
In this case, the dynamic response is
determined primarily by the encoder
system.
Torque ripple
3 % von M
0
0.6 % von M
0
With speed operating range of 20 rpm
up to rated speed.
A ripple of < 1 % is possible with an
absolute encoder ≤ 1 rpm.
Not possible with resolver.
Torque accuracy
±1.5 % of M
0
±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.
Notice: External influences such as
motor temperature can cause an
additional long-time inaccuracy
(constancy) of about ± 2.5 %. Approx.
± 1 % less accuracy in field-weakening
range.
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)
– 0.8 ms 2 ms 1.2 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
– 600 Hz 250 Hz 400 Hz
With encoderless operation in speed
operating range 1:10.
The dynamic response is enhanced by
an encoder feedback.
Torque ripple
–
1.5 % von M
rated
2 % von M
rated
2 % von 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 % von M
rated
±2 % von M
rated
±1.5 % von M
rated
Measured value averaged over 3 s.
With motor identification and friction
compensation, temperature effects
compensated by KTY84 / PT1000
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.