Siemens Simodrive 611 - Page 59

3
05.01
3.4 Direct position sensing
3-59
 Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
Single–turn, multi–turn and linear absolute systems with two sinusoidal
voltage signals A, B displaced through 90 degrees and EnDat interface
Incremental signal transfer: Differential signals
A, *A and B, *B
Amplitude A – *A 1 Vpp ± 30 %
Amplitude B – *B 1 Vpp ± 30 %
Transfer, serial signals: Differential signals
data, *data and clock, *clock
Signal level: according to EIA 485
Supply: 5 V ± 5 % (also refer to Section
Encoder power supply)
Max. supply current: 300 mA
Max. encoder signal frequency
which can be evaluated: 200 kHz standard module
350 kHz without suppressing the
amplitude monitoring
650 kHz with suppression of the
amplitude monitoring
Note
For the above specified max. encoder signal frequency, the signal amplitude
must be
 60 % of the rated amplitude and the deviation of the phase shift
from the ideal 90
d
between tracks A and B   30
d
.
Observe the frequency characteristics of the encoder signals.
A–*A
B–*B
0
0
90_el.
360_ el.
Fig. 3-3 Signal characteristics for incremental tracks for a clockwise direction of rota-
tion
3 Motor Selection, Position/Speed Sensing