Function; Led Display - Balluff BTL7-S5 Serie Manual De Instrucciones

BTL7-S5_ _(B) -M _ _ _ _ -P-S32/S115/S147/KA_ _/FA_ _
Magnetostrictive Linear Position Sensor – Profile Style
3
Construction and function (continued)
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 that is output
in antivalent form as synchronous serial data (SSI) on the
RS-422 interface. This is done with a high level of precision
and reproducibility within the measuring range indicated as
the nominal length.
In addition to the position output value, the following
functions can be selected (only BTL7-S510(B)-...):
– Differential position
– Velocity (with and without leading sign)
– Speed difference
3.3

LED display

LED 1 LED 2
Fig. 3-2: BTL7 LED displays
8 english
LED 1
Normal function
Green
Magnet is within the limits.
Red Error
No magnet or magnet outside the limits.
LED 2
Green
Synchronous operation
Internal measurement is synchronous to SSI query.
Off
Asynchronous operation
Internal measurement is asynchronous to SSI query.
Programming mode
Flashing
green Only with BTL7-S510(B)-...
Asynchronous operation is reached when the external sampling rate is
1)
> f or < 62.5 Hz (only with BTL7-S5_ _B-...), see the technical data on
A,max
page 20, Fig. 8-1.
Note on configuration
(only BTL7-S510(B)-...)
The entire function scope can only be
configured with the PC software BTL7
Configuration Tool. To do this, the USB
communication box must be connected
(see Accessories on page 24).
When reading or writing data via the BTL7 Configuration
Tool, LED 2 flashes green to display programming mode.
Behavior of LED 1 and the error value through the entire
range:
SSI
out
LED
21
2
Magnet
missing
≈ 5 mm
0
Null point
Fig. 3-3: Behavior of LED 1 and error value BTL7 ≥ 5 µm
For resolutions ≥ 5 µm, in the case of an error, bit 2
set. For resolutions < 5 µm, there is no error bit and the
value 0 is output.
1)
1)
Pos
End point
is
21