Siemens SIMODRIVE 611 Planning Manual page 72

3 Motor Selection, Position/Speed Sensing
3.5 Overview, position sensing
Table 3-5
Control
board
version
3
Drive
control
Perfor–
mance
digital
FD and
MSD
Basic
version
Drive
control
Perfor–
mance
Digital
FD and
MSD
with addi–
tional
input,
current signa
1) The absolute accuracy when synchronizing with a BERO is a function of:
– the BERO switching time
– BERO hysteresis
– signal edge gradient of the BERO signal (dependent on the direction of rotation!) and the switching thresholds
in the drive; high >13 V, low < 5 V
– the search speed or the signal run times in the evaluation electronics
2) Distance–coded reference marks can be evaluated
3-72
Direct position sensing, digital controls
Direct position sensing, digital controls
n*
Numerical
SIMODRIVE
control
drive
(digital)
module
Spindle positioning with the NC
n*
SIMODRIVE
SINUMERIK
drive
with digital
(digital)
module
coupling
Spindle positioning with the NC
n*
SINUMERIK
SIMODRIVE
with digital
drive
(digital)
coupling module
Current signals
Positioning with NC
n*
Numerical
SIMODRIVE
control
drive
(digital)
module
Current signals
Spindle positioning with the NC
BERO function for feed
drives not released
l  50 m
Incremental
1PH4/6/7
Toothed wheel
l  50 m
1PH2
Sensing head
Voltage signals
Linear
measuring
Voltage
l  50 m
system,
signals
incremental
1FT6
1FK6
l  18 m
Voltage Rotary measuring
signals system, incremental
l  50 m
Incremental
1PH4/6/7
l  18 m
 Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
05.01
M: max. possible
measuring steps
G: Encoder system
accuracy
V: Multiplication
Z: Pulse number
M = V*Z
per 360 degrees
mech.
V = 2048
G =
Motor encoder
 0.006 degrees
BERO
1)
G =
BERO
M = V*Z
per 360 degrees
mech.
Spindle
G depends on the
precision of the
toothed/measuring
wheel encoder
system
2)
M = 2048 per
encoder signal
period and grid
division
G is dependent on
the accuracy of the
optional encoder
system.
M = V*Z
per 360 degrees
mech.
V = 2048
G is dependent on
the accuracy of the
optional encoder
system.