Siemens SINAMICS S120 - Comparison: Servo <-> Vector

System Overview
Comparison: servo <-> vector
1-25
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
1.6 Comparison: servo <-> vector
Table 1-1 Servo versus vector
Servo Vector
Typical
applications
Drives with highly dynamic
motion control. Angular-locked
synchronism with isochronous
PROFIBUS. For use in
production machine tools and
clocked production machines.
Speed and torque-controlled
drives with high speed and
torque accuracy (in particular,
during operation without
encoder).
Number of drives
that can be
controlled by one
Control Unit.
1 Active Line Module +
6 Motor Modules
(with a scanning frequency of
current controller of
125 µs / speed controller 125 µs)
1 Active Line Module +
2 Motor Modules
(with a scanning frequency of
current controller of
62.5 µs / speed controller 62.5 s)
1 Active Line Module +
2 Motor Modules
(with a sampling time for current
controller-of
250 µs / speed controller 1 ms)
1 Active Line Module +
4 Motor Modules
(with a sampling time for current
controller-of
400 µs / speed controller 1.6 ms)
For operation of servo and vector V/f, see Section 2.3.
Dynamic response High Medium
Sampling time for
current
controller/speed
controller
Pulse frequency
Booksize:
125 µs / 125 µs /
 4 kHz
Booksize:
250 µs / 1000 µs /  2 kHz
(factory setting 4 kHz)
400 µs / 1600 µs /  1.25 kHz
(factory setting 2.5 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
Connectable
motors
Synchronous servo motors
Induction motors
Reluctance motors
Torque motors
Induction motors
Note:
No synchronous motors of types
1FT6, 1FK6, and 1FK7
Position interface
via PROFIBUS for
higher-level motion
control
Yes No
Sensorless speed
control
Yes (as of 10% of rated motor
speed)
Yes (as of standstill or 2% rated
motor speed)