Braun A5S1-n Series, Manual

Page: 10 / 36

A5S1-n-Manual_EN_Rev02 2021_JAN_19 Page 10 of 36
1.8 Direction of rotation signal for sensor series A5S1DD3 … -n / A5S1DS3 … -n
The sensor indicates the direction of rotation by a constant signal, which is either high or low
depending on the direction (see below for level values). The change is instantaneous as soon as
a pole pitch (e.g., 1 tooth) has passed the sensor. At standstill, the last reported direction is
retained. A hysteresis in the direction change or the combination with a speed lower limit must
be implemented in the connected evaluation unit.
The assignment between the signal level and the direction of rotation results from the installation
position of the sensor. For the purpose of predetermination, a mark o is placed on the type strip
of the sensor. If the profile wheel rotates clockwise in the viewing direction to this mark, the
output has high level, otherwise low level.
Relationship between mark and direction signal
o mark visible and rotation in clockwise direction = direction output high
o mark visible and rotation in counterclockwise direction = direction output low
o mark not visible: output inverse to above
1.9 Speed signal f2 (phase shifted) for sensor series A5S1DD4 … -n / A5S1DS4 … -n
The sensor provides two phase shifted frequency signals f1 and f2:
Relationship between mark and phase position
o mark visible and rotation in clockwise direction: f1 is ahead
o mark visible and rotation in counterclockwise direction: f2 is ahead
o mark not visible: phase position inverse to above
wrench plane
o
mark
wrench plane
o
mark