Balluff BML-S2C0-Q Series, User Manual

Page: 35 / 105

14
7
System selection
7.1 Maximum movement speed, resolution, and
edge distance
There is a connection between the selected resolution of
the sensor head, the minimum edge distance, and the
possible movement speed that is illustrated in Tab. 7-1.
Min. edge
distance 1)
V
max
acc. to edge distance and resolution
Resolution [m/s]
G K L N T
10 µm 50 µm 100 µm 500 µm 2500 µm
K 4 µs 1.98 9.52 10 10 10
L
8 µs 1 4.88 9.52 10 10
m 10 µs 0.8 3.92 7.69 10 10
N
16 µs 0.5 2.47 4.88 10 10
P 24 µs 0.33 1.65 3.28 10 10
R 100 µs 0.08 0.4 0.8 3.92 10
S 1000 µs 0.008 0.004 0.08 0.4 10
T 2000 µs 0.004 0.002 0.04 0.2 9.1
1) Connection between edge distance and counting frequency, see
appendix for table.
Tab. 7-1: BML-S2C…: Selection aid for maximum movement speed
The following applies for 4x evaluation (each edge is
counted):
Counting frequency of the
controller
≥
1
Min. edge distance
Period length =
Counting frequency
4
Example: edge distance = 1 µs
Counting frequency = 1 MHz
Period length = 250 kHz
Important!
– The controller/display must be able to count
the minimum timed edge distances indicated
in the tables (note the counting frequency of
the controller!).
– The min. edge distance can even occur at a
standstill due to the internal interpolation
process.
– Always select the next-higher movement
speed or the next-faster min. edge distance,
otherwise position detection errors may be
created by the controller during evaluation.
Sensor head design for controlling with
4x evaluation:
Example 1: required resolution: G = 10 µm
►
In Tab. 7-1: select column 1.
Max. movement speed = 0.9 m/s
►
Row 2 = select 1 m/s.
⇒
Edge distance L = 8 µs.
Example 2: required resolution G = 10 µm
►
In Tab. 7-1: select column 1.
Max. counting frequency of the controller = 0.25 MHz
Edge distance K = 4 µs
►
Select row 1.
⇒ Maximum possible movement speed: 1.98 m/s
Example 3: max. movement speed = 2 m/s
Controller detects min. edge distance M = 10 µs
►
In Tab. 7-1: select row 3.
►
Select column 2.
⇒ Max. possible resolution K = 50 µm
Coding in the type code breakdown
BML-S2C0-Q61 _ -M600- _ 0-KA05 (example)
Min. edge distance
Resolution
For further information, see Type code
breakdown on page 18.
BML-S2C0-Q _ _ _ -M6 _ _ - _ 0-KA _ _ /KF _ _ /KA _ _-S284
Incremental Magnetic Linear Encoder
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