3
05.01
3.4 Direct position sensing
3-70
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
3.3 Indirect position and motor speed sensing
The various possibilities for indirect position and speed sensing and to position
the motor shaft as a function of the drive configuration (SINUMERIK,
SIMODRIVE and Motor) are shown in Table 3-4 (Chapter 3.5).
3.4 Direct position sensing
3.4.1 Encoder systems that can be evaluated
The various possibilities for direct position sensing for positioning as a function
of the drive configuration (SINUMERIK, SIMODRIVE and Motor) and the en-
coder system being used are shown in Table 3-5 (Chapter 3.5).
As a result of the higher data transfer reliability, we recommend that sinusoidal
voltage signals are used.
The following encoder signals are recommended for fault–free operation:
⇒, refer to Chapter 3.2 ”Motor encoders”
Machine data MD 1326: $MD_SAFE_ENC_FREQ_LIMIT can be used to para-
meterize a limit frequency. The maximum value is 420 kHz, the lower limit and
default value is 300 kHz.
Note
Changes to this MD may only be made carefully taking into account the
prevailing conditions.
This functionality is only supported by SIMODRIVE 611 digital High
Performance control units.
Table 3-1 Encoder limit frequency and speed
Encoder pulses/
rev.
Speed at the maximum encoder limit frequency
200 kHz 300 kHz 420 kHz
2048 5800 RPM 8700 RPM 12300 RPM
1024 11600 RPM 17400 RPM 24600 RPM
512 22200 RPM 34800 RPM 49200 RPM
The following secondary conditions/limitations are specified:
1. Cable to be used:
Siemens cable, Order No.: 6FX2002–2CA31–1CF0
2. Maximum permissible encoder cable length:
Encoder limit frequency 420 kHz: 20 m
3. Encoder characteristics: ”–3dB cut–off frequency” greater than or equal to
500 kHz
Examples of encoders that can be used:
ERA 180 with 9000 pulses/rev and ERA 180 with 3600 pulses/rev from the
Heidenhain Company.
4. The amplitude monitoring that is active up to 420 kHz.
Recommended
encoder signals
for fault–free
operation with
sin/cos 1 Vpp
Parameterizable
encoder limit
frequency
(as of SW 5.1.14)
3 Motor Selection, Position/S
eed Sensin
02.07
To Next Page
Loading...
