Balluff BTL7-V50E-M-P-C003 Series, User Manual

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3.1 Construction
Electrical connection: The electrical connection is made
via a connector (see Type code on page 18).
Housing:
Aluminum housing containing the waveguide
and processing electronics.
Magnet: Defines the position to be measured on the
waveguide. Magnets are available in various models and
must be ordered separately (see Accessories on
page 14).
Nominal length: To optimally adapt the BTL to the
application, nominal lengths from 50 mm to 7620 mm are
available.
3.2 Function
The BTL contains the waveguide which is protected by an
aluminum housing. A magnet is moved along the
waveguide. This magnet is connected to the system part
whose position is to be determined.
The magnet defines the position to be measured on the
waveguide.
An internally generated INIT pulse interacts with the
magnetic field of the magnet to generate a torsional wave
in the waveguide which propagates at ultrasonic velocity.
The component of the torsional wave which arrives at the
end of the waveguide is absorbed in the damping zone to
prevent reflection. The component of the torsional wave
which arrives at the beginning of the waveguide is
converted by a coil into an electrical signal. The travel time
of the wave is used to calculate the position.
This information is transferred via the EtherCAT
®
interface.
EtherCAT ® is an industrial bus system based on the
physical layer of the Ethernet (see www.ethercat.org).
The BTL7 can detect and process up to 16 magnets. The
maximum number of magnets depends on the nominal
length. The position and velocity of each magnet can be
output.
The configuration is possible via the CoE interface.
The configuration options include:
– The number of magnets. A fixed number from 1 to 16
or flexible (FMM). In FMM, the number of magnets
corresponds to the number of magnets detected, a
maximum of 16
– Setting the resolution of the position and velocity
output
– Setting cam switches
– Defining working range limits
– Reversal of the measuring direction
– Configuration of the process data output (mapping)
The BTL can be operated either asynchronously or
synchronously using the Distributed Clocks.
Fig. 3-1: BTL7..., construction
3
Construction and function
50
40.6
68
41
36.8
~80 11.5 ~80 ~250 ~250
15
8 83 73
2xM12
11.5
M8
1) Unusable area
2) Not included in scope of delivery
3) Groove on the top side of the profile marks
the start of measuring range
1)
Nominal length =
Measuring range
BTL5-P-3800-2
magnet
1)
Mounting clamps with insulating bushes and
ISO 4762 M5x22 cylinder head screws, max.
tightening torque 2 Nm
2)
2)
Null point
Groove 3)
End point
BTL7-V50E-M _ _ _ _ -P-C003
Magnetostrictive Linear Position Sensor – Profile Style