Siemens SINAMICS S120 Function Manual page 120

Vector control
3.18 Variable signaling function
Comparison of servo control and vector control
The table below shows a comparison between the characteristic features of the servo and
vector controls.
Table 4- 1
Subject
Typical applications
Maximum number of drives that
can be controlled by one Control
Unit.
Dynamic response
Sampling time current
controller/speed controller/pulse
frequency
120
Comparison of servo control and vector control
Servo
Drives with highly dynamic
motion control.
Drives with high speed and
torque accuracy
(servo synchronous motors).
Angular-locked synchronism
with isochronous PROFIdrive.
For use in machine tools and
clocked production machines
1 infeed + 6 drives
(with sampling rate of current
controller 125 μs / speed
controller
125 μs)
1 infeed + 2 drives
(with sampling rate of current
controller 62.5 μs / speed
controller
62.5 μs)
High
Booksize:
125 μs / 125 μs / >= 4 kHz
(factory setting 4 kHz)
Blocksize:
125 μs / 125 μs / >= 4 kHz
(factory setting 4 kHz)
Chassis
(frame sizes Fx and Gx):
250 μs / 250 μs / >= 2 kHz
(factory setting 2 kHz)
125 μs /125 μs / >= 4 kHz
Vector
Speed and torque-controlled
drives with high speed and
torque accuracy, particularly in
operation without an encoder
(sensorless operation).
1 Active Line Module +
2 Motor Modules
(with sampling time of current
controller 250 µs / speed
controller 1 ms)
1 Active Line Module +
4 Motor Modules
(with sampling time of current
controller 400 μs/500 μs / speed
controller 1.6 ms/2ms)
V/f control:
1 Active Line Module +
8 Motor Modules
(with sampling time of current
controller 500 µs / speed
controller 4 ms)
Average
Booksize:
250 μs / 1000 μs / >=2 kHz
(factory setting 4 kHz)
500 μs / 2000 μs / >= 2 kHz
(factory setting 4 kHz)
Blocksize:
250 μs / 1000 μs / >= 2 kHz
(factory setting 4 kHz)
500 μs / 2000 μs / >=2 kHz
(factory setting 4 kHz)
Chassis:
<=250kW: 250 μs / 1000 μs /
>=2 kHz
> 250 kW: 400 μs / 1600 μs /
>=1.25 kHz
690 V: 400 μs / 1600 μs /
>=1.25 kHz
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions