User Manual

6/12 Bosch Rexroth AG
DSM Series 10
RE 95132/11.08
Output signals
Air-gap reserve (LR) and installation position (EL)
The sensor reacts to magnetic flux changes. If the air gap
between gear and sensor is too great, the signal output may
possibly be impaired:
0
0
Air gap
Boundary
flux change
Magnetic flux
change
Near
flux change
Boundary air gap
Air-gap reserve threshold (LR)
Installation position
threshold (EL)
Installation
flux change
Boundary area boundary
flux change
When magnetic flux changes are smaller than the boundary
flux
change
, this may result in signal misfires.
Near area near
flux change
When magnetic flux changes are less than the near
flux change
,
the LR bit is output.
Installation position installation
flux change
When magnetic flux changes are less than the
installation
flux change
, the EL bit is output.
Performance as speed increases
As speed increases, the next edge on the wheel is detected
before the signal is output in its planned length. In these cases,
the signal is shortened and the zero-time (45 ms) that comes
after each edge, overwrites the signal. It is thereby ensured
that the frequency of the pulse and, thus, the speed is always
correctly transmitted. The loss of the direction of rotation infor-
mation is then uncritical, because at the time, because of the
high speed, no change in the direction of rotation can occur. If
the speed is reduced (e.g. ranging from slow-down to change
in the direction of rotation), the signal is completely output
again and the change in the direction of rotation occurs.
Pulse width shorter than a half speed period length
Pulse width longer than a half speed period length
Transmitted signal
Sensor-internal rotary signal at increasing speed