Function; Led Display - Balluff BTL7-A501-M -A-S32 Serie Manual De Instrucciones

BTL7-A/E501-M_ _ _ _-A/B/Y/Z(8)-S32/S115/S140/KA_ _/FA_ _
Magnetostrictive Linear Position Sensor – Rod Style
3
Construction and function (continued)
3.2

Function

The BTL contains the waveguide which is protected by an
outer stainless steel tube (rod). 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. Depending
on the version, this information is made available as a
voltage or current with rising or falling gradient.
The following functions can be selected for the output
values:
– Position
– Velocity (with or without leading sign)
– Differential position
Two outputs that can be independently assigned are
available. Two magnets can be used.
The entire range of functionality 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 26). If you do not have
the PC software, the BTL can be adjusted using
the calibration device (see page 17 ff).
8 english
3.3

LED display

LED 1 LED 2
Fig. 3-2: Position of the BTL7 LED displays
In normal operation, the LEDs indicate the
operating states of the BTL. LED 1 is assigned
to output 1, LED 2 is assigned to output 2 (see
page 19 ff).
LED 1/LED 2 Operating state
Green Normal function
Magnet is within the limits.
Red Error
No magnet or magnet outside the limits.
Tab. 3-1: LED displays in normal operation