RLS DiTrak Mounting instructions

Application note
NBP02_01
Issue 1, 11th June 2018
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Tools and documentation required to perform encoder calibration
1. RLS DiTrak absolute magnetic encoder website
2. DiTrak encoder data sheet
3. RLS DiTrak encoder (one of options)
4. RLS magnetic ring
5. Interconnecting cable between encoder and interface
6. RLS USB PC Interface E201-9B
7. Mechanical mounting setup
8. Ditrak calibration application
DiTrak application note
DiTrak encoder calibration
software manual
Setup
1. Mount the ring and DiTrak encoder according to mechanical specications listed in DiTrak
Encoder datasheet.
2. Connect encoder to E201-9B interface.
3. Connect E201-9B via USB cable to your computer.
4. Launch the DiTrak calibration application
5. Press “Connect” button – when connected all should lit green, if error occurs it is listed in
command window.

Application note
NBP02_01
2
6. For calibration open tab “Calibration/Settings”. Assure that magnetic ring is rotating at constant speed from 50 to
300 RPM. Choose approximate value of rotating speed. It is not recommended to calibrate outside of rotation speed
ranges mentioned above.
7. Press “Calibrate” button and wait for calibration to complete (it will take approximately 1 minute).

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8. After calibration the results are displayed in a status bar. If calibration was successful Track Error, Phase, O󰀨set and
Gain elds will lit green. If they lit orange it means that calibration was successful but the parameters are at limit
values.
If parameters lit red calibration was not successful. In such case instructions for error solving are listed in “Error solver”
window on the right. Mechanically adjust the system by listed recommendations and repeat Calibration.
After successful calibration press “Write EEPROM”, to permanently store calibration settings into encoder.
Error solver:
Error Solution for Radial Ring Solution for Axial Ring
Gain Adjust ride height (air gap between
readhead and ring)
Adjust ride height (air gap between
readhead and ring)
Sin/Cos o󰀨set
Adjust the parallelism between the
magnetic ring and the sensing surface of
the readhead
Adjust the parallelism between the
magnetic ring and the sensing surface of
the readhead
Phase Adjust ride height (air gap between
readhead and ring)
Adjust radial and tangential position of
encoder
Track Error
Check magnetic carrier and read
head orientation, note the above
recommendation and adjust axial encoder
position
Check magnetic carrier and read
head orientation and note the above
recommendation
NOTE: Unsatisfactory calibration results can also be caused by poor or damaged magnetic ring.

Application note
NBP02_01
4
Calibration Application Extra Settings
1. Multi-turn position is counted. Encoder position readout: Tab “Position” o󰀨ers di󰀨erent modes to display the single-turn
position (counts, degrees, hexadecimal, binary. Multi-turn is always in counts (shaft turn counter).
2. Rotation direction / Set zero position: current mechanical position can be set as a zero encoder readout by pressing
“Set to Zero” button. Direction of encoder counting can be inverted.

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3. Advanced settings can be found in tab Settings:
- Invert all incremental signals separately: A, B and Z signal can be inverted
- Resolution: incremental resolution can be set from 4 counts to 262144 in 4 count increments
(Note: higher incremental resolution means lower maximum rotation speed) also AB Output
Frequency must be set after selecting higher incremental resolution.
- Index Pulse Length: Length of index pulse can be set from 90° to 360° (inside the AB cycle / magnetic period).
- Hysteresis: hysteresis of incremental signals can be set from ~ 0° to 0.7°.
- UVW Commutation Start Signal Angle: Start angle of UVW signals can be set from 0° to 359.91° with step of 0.09°.
- Filter: lters from 0dB (not recommended) to 51dB can be set.
4. Applying changes: to permanently save settings into encoder press button “Save Settings”.

®
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RLS merilna tehnika d.o.o. has made considerable e󰀨ort to ensure the content of this document is correct at the date of publication but makes no warranties or representations
regarding the content. RLS merilna tehnika d.o.o. excludes liability, howsoever arising, for any inaccuracies in this document. © 2018 RLS d.o.o.
RLS merilna tehnika d.o.o.
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Pod vrbami 2
SI-1218 Komenda
Slovenia
Head o󰀩ce
T+386 1 5272100
F+386 1 5272129
E[email protected]
www.rls.si
Document issues
Issue Date Page Corrections made
1 11. 6. 2018 - New document