Servo Control - Siemens SINAMICS S120 Function Manual

Servo control

This type of closed-loop control enables operation with a high dynamic response and
precision for a motor with a motor encoder.
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 account:
Section "Rules for wiring with
DRIVE-CLiQ"
in this document below
Dynamic response
Note:
Further information about the sampling conditions is contained in the "Rules for setting the sampling time" subsection in
this manual.
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
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
•
(for current controller sampling rates
125 μs or speed controller 125 μs)
1 infeed + 3 drives
•
(for current controller sampling rates
62.5 μs or speed controller 62.5 μs)
1 infeed + 1 drive
•
(for current controller sampling rates
31.25 μs or speed controller
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
•
(for current controller sampling times
250 μs or speed controller 1 ms)
1 infeed + 6 drives
•
(for current controller sampling times
400 μs/500 μs or speed controller
1.6 ms/2 ms)
V/f control:
•
1 infeed + 12 drives
(for current controller sampling times
500 μs or speed controller 2000 μs)
Mixed operation, vector control with 500
•
µs with V/f, max.11 drives
Medium
4
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