Sensorless Vector Control (Slvc) - Siemens Sinamics S120 Function Manual

Vector control

4.1 Sensorless vector control (SLVC)

Subject
Maximum output frequency with
closed-loop control
Note:
The derating characteristics in the various Manuals must be carefully observed!
Max. output frequency when using dv/dt and sine-wave filters: 150 Hz
Response when operating at the
thermal limit of the motor
Speed setpoint
channel (ramp-function generator)
Parallel connection of power units
4.1 Sensorless vector control (SLVC)
For sensorless vector control (SLVC), the position of the flux and actual speed must be
determined using the electric motor model. The motor model is buffered by the incoming
currents and voltages. At low frequencies (approx. 0 Hz), the motor model cannot determine
the speed with sufficient accuracy. For this reason, in this range, the vector control can be
switched over from closed-loop to open-loop control. When using passive loads, additional
limitations and constraints must be taken into consideration. This will be subsequently
discussed.
142
Servo control
1300 Hz with 62.5 μs / 8 kHz
•
650 Hz with 125 μs / 4 kHz
•
300 Hz with 250 μs / 2 kHz
•
Note:
SINAMICS S can achieve the specified
values without optimization.
Higher frequencies can be set under
the following secondary conditions and
additional optimization runs:
Up to 1500 Hz
•
– Operation without an encoder
– In conjunction with controlled
infeeds
Up to 1600 Hz
•
– Operation with encoder
– In conjunction with controlled
infeeds
Absolute upper limit 1600 Hz
•
Reduction of the current setpoint or
shutdown
Optional
(reduces the number of drives from 6 to
5 Motor Modules for current controller
sampling times of 125 μs - or speed
controller sampling times of 125 μs)
No
Vector control
300 Hz with 250 μs / 4 kHz
•
or with 400 μs / 5 kHz
240 Hz with 500 μs / 4 kHz
•
Reduction in the pulse frequency and / or
the current setpoint or shutdown (not
applicable with parallel connection / sine-
wave filter)
Standard
Booksize: No
•
Chassis: Yes
•
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions