Theory of Operation........................................................................................................................................................................ 4
Temperature Range.........................................................................................................................................................................5
Available Sensors..............................................................................................................................................................................5
Temperature Sensor Data...........................................................................................................................................................11
Temperature Signal.......................................................................................................................................................................14
Speed and Temperature Sensor for Hydrostatic Propel Products
General Information
Description
Function of the speed sensor is to detect the shaft speed. Typically the sensor is mounted to the housing
of a Danfoss pump or motor and senses the speed from a target ring that is rotating inside the pump or
motor.
Because of the digital output signals for speed the sensor is ideal for high and low speed measurements.
The speed sensor is designed for rugged outdoor, mobile or heavy industrial speed sensing applications.
The detection of the speed is contactless. It is custom-designed for Danfoss. It is a Plug and Perform device
that does not need any calibration or adjustments.
For diagnostics and other purposes, some sensor also has the capability to detect the driving direction
and the case oil temperature.
Theory of Operation
The speed sensor is externally powered and, in response to the speed of the target ring, outputs a digital
pulse signal. A magnet inside the sensor provides the magnetic field that changes with the position of
the target teeth.
The target ring is attached to the cylinder block or the shaft. Hall sensors change from high/low state as
the target teeth pass by the sensor´s face. The digital (on-off-on-off ) pulse train is fed to a controller,
which interprets its rate of change as a speed.
Some speed sensor uses two Hall sensors with specific distance and orientation resulting in a pulse train
output shift of 90° between the two sensors. A logic circuit decodes the two signals to provide an
additional direction indication (high or low depending on direction).
Due to the design of the sensor, the duty cycle (ratio between on and off time at constant speed) of both
speed signals at any working condition is close to 50 % and can be used for better resolution at low
speeds.
Speed Rings
Target Ring
Speed rings vary according to the diameter of the cylinder block or shaft on which they are installed. The
number of teeth can be seen in the technical information of the H1 pumps and H1 bent axis motors.
They may be ordered directly from the pump manufacturer or retrofitted to existing pumps and motors
by authorized service centers (specialized tooling is required for mounting).
Speed (target) rings vary according to the diameter of the cylinder block or shaft on which they are
installed. The number of teeth is shown in the table below.
Sensor pinout
1 Speed signal 2
2 Direction signal
3 Speed signal 1
4 Supply
5 Ground
6 Temperature
Technical Information
Speed and Temperature Sensor for Hydrostatic Propel Products
General Information
DescriptionOrder number
14905511232698
Direction signalOneOne
Temperature signalOneOne
For more information, see and .
Dimensions
For more details about Mating connector, see the chapters Speed Sensor 4.5 – 8 V Technical Data and
Speed Sensor 7 – 32 V (1 Speed Signal)
Sensor Installation
The sensor is positioned in the housing and fastened by one screw.
The gap between the sensor and the target does not need to be adjusted, nor it does need to be rotated
Low state > 0 V to provide wire fault detection.
Ratiometric output voltage means that the output signal is proportional to the supply voltage. Example:
5 % of 5000 mV sensor supply = 250 mV sensor signal accepted as low output voltage
5 % of 4900 mV sensor supply = 245 mV sensor signal accepted as low output voltage
For more information see Wire Fault Detection on page 14 and Output Signals on page 10.
Speed and Temperature Sensor for Hydrostatic Propel Products
Speed Sensor 4.5 – 8 V Technical Data
Wire Fault Detection
The output voltage levels are defined for a direct connection of the sensor to supply. The outputs are
directly connected to a load which is 15k Ohm to ground and 15k Ohm to Supply.
The signal outputs are protected by an 1100 ohm (1k1) resistor. Speed signal 1 (pin 3) offers an advanced
error detection by providing different signal levels in case of an error.
Output Signals
Speed signal 1 (pin 3) signal conditions:
Speed signal 2 (pin 1) and direction signal (pin 2) signal conditions:
Low state > 0 V to provide wire fault detection.
Ratiometric output voltage means that the output signal is proportional to the supply voltage. Example:
5 % of 5000 mV sensor supply = 250 mV sensor signal accepted as low output voltage
5 % of 4900 mV sensor supply = 245 mV sensor signal accepted as low output voltage
For more information see Wire Fault Detection on page 14 and Output Signals on page 10.
Danfoss | January 2021BC152886482203en-000701 | 13
Signal
Supply
GND
Speed & Direction sensor 4,5-8V
15k
15k
Controller Hardware
P301 547
1k 1
Sensor (+)
Ground (-)
Input
Voltage boundaries
100%
85%
55%
10%
2%
0%
Signal short to power
Valid signal, high state
Signal / Power or
Ground lead open
Valid signal, low state
Signal short to ground
T = –1481.96 + √ 2.1962 · 106 +
(1.8639 – Vº)
3.88 · 10
-6
Technical Information
Speed and Temperature Sensor for Hydrostatic Propel Products
Speed Sensor 7 - 32 V
Wire Fault Detection
The output voltage levels are defined for a direct connection of the sensor to supply. The outputs are
directly connected to a load which is 15k Ohm to ground and 15k Ohm to Supply.
The signal outputs are protected by an 1100 ohm (1k1) resistor. Speed signal 1 (pin 3) offers an advanced
error detection by providing different signal levels in case of an error.
Output Signals
Temperature Signal
Speed signals 1, 2 and direction signal
For calculation of the case fluid temperature and the output signal voltage, see the formulas below.
Danfoss | January 2021BC152886482203en-000701 | 15
Technical Information
Speed and Temperature Sensor for Hydrostatic Propel Products
Appendix
MTTFd Values
MTTFd values are calculated per ISO 13849, assuming 50 % of all failures are dangerous.
Duty cycle is 67% and main operating temperature assumption is 80 °C. According to the internal
Danfoss standard 504H0078, the daily working time is calculated with 8 hours/day and 200 working days
per year.
SensorOrder Number
14905511232698
Supply voltage4,5-8V7-32V
Speed Signalstwotwo
MTTFd values2098 years301 years
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