Siemens SINAMICS S120 Function Manual page 84

Servo control
Comparison of servo control and vector control
The table below shows a comparison between the characteristic features of servo and vector
controls.
Table 4- 1 Comparison of servo control and vector control
Subject
Typical applications
Maximum number of drives that
can be controlled by one Control
Unit
To be taken into consideration:
Chapter "Rules for wiring with
DRIVE-CLiQ (Page 1014)"
in this document below
Dynamic response
Note:
Additional information on the sampling conditions is provided in subchapter "Rules regarding sampling times (Page 1007)"
in this manual.
84
Servo control
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
High output frequency
•
1 infeed + 6 drives
•
(with current controller sampling times
125 μs or
speed controller sampling times
125 μs)
1 infeed + 3 drives
•
(with current controller sampling times
62.5 μs or
speed controller sampling times
62.5 μs)
1 infeed + 1 drive
•
(with current controller sampling times
31.25 μs or speed controller sampling
times 62.5 μs)
Mixed operation, servo control with
•
125 µs with V/f, max.11 drives
High
Vector control
Speed and torque-controlled drives
•
with high speed and torque accuracy,
particularly in operation without an
encoder (sensorless operation)
1 infeed + 3 drives
•
(with current controller sampling times
250 μs or
speed controller sampling times 1 ms)
1 infeed + 6 drives
•
(with current controller sampling times
400 μs / 500 μs or
speed controller sampling times
1.6 ms/2 ms)
V/f control:
•
1 infeed + 12 drives
(with current controller sampling times
500 μs or
speed controller sampling times
2000 μs)
Mixed operation, vector control with
•
500 µs with V/f, max.11 drives
Medium
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions