User Manual

2/8 Bosch Rexroth AG
HDD RE 95 135/06.06
Ordering Code / Standard Program
Type
01
Hall-effect speed sensor
HDD
Version
02
One frequency output, one output for direction of rotation
1
Two frequency outputs
2
Installation depth
03
16 mm
L16
32 mm
L32
Output circuit
04
NPN
N
PNP
P
Connection
05
HDD 1L16
HDD 1L32
HDD 2L32 HDD 2L16
N P N
P
Core end sleeve
● ● ● ●
A
male connector
DEUTSCH DT04-4P-EP04
●
– – –
D
Series
06
2
Index
07
0
● = available – = not available
HDD / 2 0
01 02 03 04 05 06 07
Description
The HDD Hall-effect speed sensor is used for contactless
speed measurement of even very low speeds of rotation. Two
Hall-effect semiconductor elements in the sensor measure a
change in magnetic flux caused by a ferromagnetic gear on the
sensor. This magnetic flux change is converted into square-
wave pulse signals by the built-in electronic system. The
frequency f of the square-wave voltage emitted by the sensor is
calculated from the number of teeth z on the circumference of
the gear wheel and the speed of the drive shaft or PTO shaft,
using the following formula:
z • n f in sec
-1
f =
____
n in rpm
60 z = number of teeth
The number of teeth is specified in the catalogue sheet for the
relevant axial piston motor.
The sensor is suitable for installation in various devices, inclu-
ding the following Rexroth axial piston motors:
A2FM ________________________________ see RE 91001
A6VM ________________________________see RE 91604
A6VE _________________________________see RE 91606
Before the sensor can be installed, the motors must be prepa-
red for speed measurement by HDD (see page 6).
The sensor is available in four basic variants.
HDD1 delivers a square-wave signal proportional to the speed
of rotation and a switch signal that identifies the direction of
rotation.
HDD2 delivers two square-wave signals that are offset with a
90° phase delay suitable for redundant speed detection. Addi-
tionally, these signals can be used to calculate the direction of
rotation using e.g. a Rexroth RC controller (RE 95200).
Both variants are available with NPN (default) or PNP output
circuit.