Siemens Simovert Masterdrives Compendium page 811

Technology Option F01
9.6 Configuration
9.6.1 Encoders for the position sensing system
Encoder Sensor Board in
Type MASTERDRIVES
MC
2) SBR1/SBR2
Resolver
(without/with pulse
encoder simulation)
Sin/cos SBM2
encoder ERN
5)
1387
Absolute SBM2
encoder
EQN 1325 5)
Pulse SBP
3)
encoder
SSI absolute SBM2
4)
encoder
Absolute SBM2
encoder
EQI1325 6)
9-120
The sensor boards for the various encoders that can be connected to
MASTERDRIVES MC are described in the first section of "Brief
description of the technology functions". The table is intended as a
configuring aid, and shows an overview of the properties of the various
encoders:
Resolution
[Increments/ Revolution] [Increments/
4096 inc./rev.
with 2-pole resolver
6
16,8 x 10 Inc/rev.
6
16.8 x 10 inc./rev.
4096 rev. reproducible 7)
No. of lines x 4, i.e. 4096
inc./rev. with standard
motor encoder
4096 inc./rev. typical
4096 revolutions typically
reproducible
4096 Inc/rev.
Notes:
In practice, the resolution of the encoder must be between 1 and 10 times
1)
higher than the required positioning accuracy. The accuracies specified in
the table are only approximate guidelines.
2) Notes on resolver:
•
Correspondingly higher resolution and accuracy with multi-pole resolvers
•
In the following cases, you should use an ERN1387 sin/cos encoder
instead of a resolver:
• If extremely high positioning accuracy is required
•
If an extremely high control response is required
•
If printing indices are to be detected exactly
•
If a good rotary response is required at extremely low speeds below
approx. 5 rpm.
• With the SBR2, the pulse encoder simulation is connected to terminals
with 2 tracks each with 512 or 1024 pulses per revolution (adjustable) and
zero pulse, RS422 level (TTL differential signal). Valid for 2-pole
resolvers; correspondingly larger number of pulses per revolution with
multi-pole resolvers.
Achievable
Positioning
Accuracy
Revolution
1024 inc./rev.
with 2-pole
resolver
5
10 ... 10
Inc./rev.
5
10 ... 10
Inc./rev.
Number of lines x 1,
i.e. 1024 inc./rev.
with standard motor
encoder
1024 inc./rev.
typical
1024 Inc/rev.
6SE7087-6QX70 (Version AN)
Compendium Motion Control
08.2012
Can be Used as
1)
Motor External
Encoder Encoder
Yes No
6 Yes Yes
6 Yes Yes
Yes (with Yes
asynchr-
onous
motor)
No Yes
Yes No
Siemens AG
SIMOVERT MASTERDRIVES