Bogen AKS17 User manual

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BOGEN Magnetics GmbH · Potsdamer Straße 12 - 13 · 14163 Berlin · Germany
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Content
Safety Instructions 2
Electromagnetic Compatibility 3
Intended Use 3
Function and Properties 3
Assembly and Installation 4
Programming Device 4
Configuring the AKS17 Sensing Head 6
Protocol Data Packet Information 8
Offset Compensation 9
Serial Port Signal Trigger 9
Tips on the Software and Calibration 10
Commissioning 10
Maintenance 10
Appendix 11
EU Declaration of Conformity 14
AKS17
Absolute Magnetic Sensing Head
Installation and Operating Instructions

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Safety Instruction
Read these instructions carefully prior to installation and operation. This manual is intended for
professionals who perform the installation and the setup. The assembly of the system requires knowledge of
mechatronics and general health and safety regulations. Follow all warnings and instructions for your own
safety and the safety of your system.
These operating instructions apply to the magnetic sensing head AKS17 in connection with a magnetic scale
for linear or rotary applications.
Risk of electric shock or short circuit!
Incorrect handling of electrical equipment can be
fatal or cause damage to property.
Danger to life!
Unauthorized use of the system can be highly
dangerous. The magnetic position sensing heads
must not be used in life-saving systems such as
airplanes etc.
Risk of pinching
There is a risk of getting pinched between the
sensing head and the magnetic tape. This can lead
to injury or mechanical damage. Avoid getting with
your limbs and tools near the gap between the
head and the tape while the measuring system is in
motion!
Dangers that may follow
Malfunctions of the measuring system can lead to
further risks to the device or the system in which it
is embedded.
When there is evidence that the measuring
system is not working properly, it must be put out
of operation and secured against unauthorized
use. The prescribed safety regulations must be
observed for the use of position sensing head. In
particular, measures must be taken to prevent
dangers to people and property in the event of a
failure. This includes the installation of additional
safety limit switches, emergency stop switches
and the observance of the required environmental
conditions.
Risk of damage for the magnetic layer
Magnetic tapes and sensing heads can be damaged
by magnetic fields! Apply only demagnetized tools
for assembly and maintenance! Improper storage of
magnetic tape rolls can lead to magnetic interaction
between the layers and thus to a reduction of the
measurement accuracy.

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Electromagnetic Compatibility
For the electrical connection it is essential that the electromagnetic compatibility (EMC) is guaranteed.
• System and control cabinet must be connected to the same ground potential.
• Use shielded cables. Connect the cabinet side of the cable shield with protective earth (PE).
• Avoid installing in close proximity to power lines.
• The nominal operating voltage (see datasheet) must be observed even if there is a voltage drop along the
supply line!
• Determine the place of installation so that inductive and capacitive interferences cannot affect the sensor.
By adequately routing the cable, interferences can be reduced.
Intended Use
The magnetic position sensing heads AKS17 are highly accurate measuring devices consisting of magnetic
scales and sensing heads capable of non-contact position detection for linear and rotary applications.
Fields of deployment:
• capital equipment,
• automation,
• medical engineering,
• electrical engineering.
A measurement solution consists of a sensing head and a linear or rotary magnetic scale and can be
incorporated into various electronic systems. It can be configured according to the customer‘s specifications.
In combination with a suitable analysis software absolute and relative position and position changes can be
measured. In this way it is possible, for instance, to control machine tools, determine torsional forces or
detect longitudinal expansions.
Function and Properties
The magnetic position sensing heads AKS17 are suitable for non-contact, absolute and incremental position
measuring systems. The measuring function is realized by magnetic scanning.
The system has the following features:
• absolute and incremental encoder
• 21 to 24 bit absolute resolution
• 18 bit incremental resolution
• non-contact, quick position measurement
• single piece unit
• no wear from usage
• resistant to dust, cooling lubricant emulsion, oil, etc.
• different diameters and length offered
• radial, axial or linear reading

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Mode of operation
The sensing head with its sensor is mounted on the machine part whose position is to be measured. The
measuring magnetic surface is mounted along the measuring distance. On the magnetic tape alternating
magnetic north and south poles are positioned with a regular distance. The magnetic hall sensor cells in the
sensing head are scanning the magnetic poles on the tape contact-free.
Permissive linear and rotation speed see technical data sheet of the respective type on the website:
http://www.bogen-magnetics.com/en/bogen/company/download.html
Digital absolute output:
The sensing head with digital absolute output signal converts the analog signals to an absolute information
in BISS-C or SSI.
Digital incremental output:
The sensing head with digital incremental output signal converts the analogue signals into digital A/B and Z
pulses and transmits them to the controller. The two digital signals A and B are electrically phase-shifted by
90°. The sign of the phase shift represents the direction of movement of the sensor. Every change of A or B
(rise to fall or vice versa) is a count for the period counter (up/down counter). If signal A is preceding signal
B, the counter increases. If signal B is preceding signal A, the counter decreases. The Z pulse appears every
time when passing the zero point. The controller thus knows at all times the increment position, without
having to query the sensing head periodically (real-time capability). Therefore, after an interruption of the
power supply the sensing head can still read its correct absolute position on the scale.
Assembly and Installation
During assembly utmost cleanliness is required. Device parts have to be degreased thoroughly before gluing.
During installation the mounting tolerances and the position of the measuring point have to be observed
respectively implemented as stated in the datasheet.
Measurement options
The AKS17 comes with two measurement options.
• option 1 is a sensing head with parallel orientation of AKS17 chip
• option 2 is a sensing head with perpendicular orientation of AKS17 chip
Delivery condition
The AKS17 is supplied with a connector Molex 501568-1207 or with a FFC as an alternative for Molex.
Programming Device
Introduction
Each AKS17 requires a calibration process in assembly. It is recommended that the calibration is performed
across the whole working range of the sensing solution.
The calibration process consists of an analog calibration where the different sensors in the sensing head will
be optimized for best performance and a nonius calibration where the sensing head is optimized over the

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scale.
With the AKS17 software and hardware the parameters of an AKS17 sensing head can be changed for
a successful calibration. The software sets the sensing head parameters for the correct master-nonius
periods (128/127/120, 256/255/240, 512/511/496, 1024/1023/992) and the operating measurement systems
(linear, rotary radial, rotary axial).
To calibrate the sensing head you need following:
Windows PC Sensing Head AKS17 Programmer AKS17
Cable for programming unit (USB 2.0 Type A connector / mini-B connector)
Cable (9 pin serial cable / Molex or FFC)

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System requirements
The programming device can be connected to a Windows PC with a USB cable and operated with the
dedicated software. The software requires Windows Vista or later (32/64 Bit).
Before the programming device (Programmer AKS17) can be connected the specific driver must be installed.
Copy the software to a local directory on your Windows PC. To install the driver execute the specific program.
USB_Adapter_00052040_Driver.exe Connecting the device (for the calibration setup)
Mount the sensing head correctly per mechanical specifications. It is required to place the sensing head
within the allowed mechanical tolerances (maximum displacement), see technical data sheet.
Both status LEDs (green and red) on the AKS17 sensing head will light up now if all devices are mounted
correctly. The pictures below show the final stage of all connected cables and the programming device.
Programming software
Copy the programming software (AKS16 and AKS17 Calibration GUI) to a local directory or use the “Setup.
msi” to install the software and the driver. By default the installation directory can be found at “Program
Files”.

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Configuring the AKS17 Sensing Head
The software will calibrate the sensing head for the present mechanical alignment. Make sure the AKS17
sensing head is now mounted correctly including all devices for calibration. Ensure, that the AKS17 is
connected to the PC as described above.
In case of radial or axial orientation start rotating the scale (or move
the sensor around the scale) and press “One step calibration”.
In case of linear orientation make sure the sensor will start moving
after the delay, then press “Start”.
Note: The user should just move the sensor manually at the end of the
delay countdown.
Start the BOGEN calibration software “AKS16 and AKS17
CalibrationGUI”.
Choose “AKS17” from the “Sensor” combo box.
Choose the desired sensor parameters (see technical data sheet for
full listing of sensor parameters). Please note that the resolution
combo box is only available if interface incremental is “ABZ” which
describes the incremental ABZ resolution. When “UVW” is chosen
another combo boc will appear. Here the user can choose the pole
pairs that correspond to UVW (see datasheet).
Choose the orientation option from the right side of the window by
clicking on the photo or the radio button. Make sure it is how the
sensor is mounted.
From “File” in the main menu the sub menu items “Calibration Setup”
and “Preference” can be reached. These configurations are set by
default as seen in the figures and they will be saved and reused every
time the program starts. For a detailled description please refer to
“Tips on the software and calibration”.
Connect the sensor to the adapter and then the adapter to the PC.
Please make sure the sensor is mounted properly within the tolerance
(see datasheet).

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The next step is the nonius calibration where the sensor uses the
calibrated analog parameters to read out the sensor. If the read
out results contain values that are out of range, the calibration
considered to be failed and has to be done again. In case of linear
calibration the user will be prompt with a count down window on the
nonius calibration.
The user can continue and save in case of bad nonius calibration (not
recommended but available for extreme situations).
Afterwards the program starts the automatic calibration operation and
interacts and shows the user the current process.
In analog calibration the user will be prompt to adjust the current
X-Y-position or to verify the air gap between the sensor and the scale
or both if needed. In case of linear calibration the user will be prompt
with the countdown window on every iteration.
The user has to move the magnetic target during the calibration
process. In linear application the user can move the scale in a user-
defined direction after the countdown is over. The duration of the
movement depends on the “Calibration Setup”.
Depending on the result of the analog calibration the user has the
choice to repeat the calibration or to continue without adjusting the
current position (not recommended but possible).
If the calibration has been successful the user will be informed about
this. Now the user has the choice if he wants to see details or not. The
details contain several calibration charts as seen on page 8.
A “Details” button will be visible after calibration is finished. After
pressing this button a new window will be shown. It contains all
calibration information details (for more information on details please
refer to “Details” section).
Disconnect the cables from the PC, programmer AKS17 and sensing
head. The sensing head is now ready for use. Connect the sensing
head with your devices or power unit as desired for your application.

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In the “Details” window the user can check the calibration charts
and calibrated analog values. The “Details” window consists of three
sections:
1. Analog calibrations
A good calibration should center both graphs, Master and Nonius, as
close as
possible to zero. The smaller the amplitude, the better the calibration.
In case the analog electrical angle error is more than 12° the analog
calibration is considered to be failed.
2. Analog calibration values
Analog calibration values are automatically calculated and set in
the sensor.The user cannot change them but he can read them for
verification purpose. A green circle next to the value means that the
value is within the recom-
mended range. Otherwise the circle is red and in the textbox to the right
the
user can see the corresponding error message.
3. Nonius calibration
Max% and Min% represent the maximum and minimum percentage
value from result regarding the range. If marked green, they are less
than 80% of the range. If marked orange, they are between 80% and
100%. Otherwise the mark is red. It is recommended to keep them
less than 80% of the range. A better calibration has values of “Result”,
“Error” and “Track” closer to zero.
AKS17 23-Bit BiSS-C data packet information example.
Note that the red nE and the orange nW are active low bits.
Protocol Data Packet Information
The protocol data packet can be shown by connecting the sensor and then clicking on “Help” in the menu.
After clicking on “Show Protocol Data Packet” the currently saved internal protocol configuration that has
been set inside the sensor in both BiSS and SSI protocols will be shown.
The following two figures are examples of BiSS-C and SSI protocol packets
AKS17 23-Bit SSI data packet information example.
The data packet information in the window can be saved as a png-image-file by clicking on the graphic and
choosing a disc place to save it.

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Offset Compensation
The software provides an “Offset Compensation” tool which can be chosen by the user. It offers two options:
1) The user can set the current position to zero. In this case the
software will calculate the offset needed to set the current position as
zero automatically.
or
2) The user can set the desired offset manually. The new current
position is calculated by adding the offset to the current position.
Example: Current position is 24000 Ticks but the user wants this position to be 1050 Ticks. Now the user can
enter 239194 ((Current Position + Resolution) mod Resolution) in the “Desired Offset” and then click “Set”.
The software automatically calculates the smallest possible offset that is a multiple of 4 and more than the
desired offset, that is 239196 to be set.
Serial Port Signal Trigger
The software provides a triggering signal using the serial port. The typical application for this feature will
use a microcontroller with already defined commands to start and stop. This microcontroller passes the
signal to a more complex system, e.g. starting a motor.
In this window the user needs to set the corresponding configurations for the signal receiver and the “Start/
Stop” commands. If a carriage return is chosen it will automatically be amended after the command.
Note: This tool is meant to be used only by professionals! Please provide an appropriate safety
mechanism, including emergency switches, movement limit switches etc.