POSITAL

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FAQ Kit Encoders

1. Axial and radial shaft play are not stated at the data sheet.

Axial: max ±0,3mm, recommended static ±0,2mm, dynamic ±0,1mm.
Radial: ±0,10mm
For static and dynamic tolerances, please see also question No.:2

2. How do you specify static and dynamic mechanical tolerances?

Static tolerances are the stuck-up of all mechanical tolerances of the motor during assembly. This tolerance will be compensated by the encoder at the calibration run. Dynamic tolerances occur when the motor is under load and/or spinning (e.g. shaft movement caused by a worm gear or thermal extension of the shaft). Dynamic tolerances of the shaft cannot be compensated by the electronic calibration completely and can have an impact on the system accuracy. In order to stay within the specified accuracy, the dynamic tolerance should be within the recommended range.

3. Operating temperature is specified to +105°C maximum. Any way to increase this?

Data retention time of the internal FRAM is 10 years at this maximum temperature. This can be increased to +115°C without any influence on the functional capability of the encoder but data retention time drops down to 5 years. Any further increase of the operating temperature will affect functional capability of the encoder.

4. We would like to get the magnet without hub and fix it directly to our shaft.

The material of the hub is important to block magnetic flux. To setup your own design, please contact us.

5. BiSS-C is not implemented in our controller, but SSI is available. Any way to use it?

Yes, there is a workaround to use SSI instead of BiSS-C. This will allow position data to be read from the encoder but access to all other features of the encoder will be denied because the bidirectional communicate is not existing.

6. The encoder is fully integrated into our motor. To save space we’d like to skip the encoder housing.

The housing is part of the magnetic shielding of the encoder. In the case that your motor housing design meets the requirement for magnetic shielding of the encoder, you can skip the housing. It is highly recommended to calibrate this with our application team before it is implemented.

7. Encoder calibration consumes too much time and resources. What happens if we skip it?

In case your tolerance [FAQ 2] of the shaft is within the range we specified, it might work on a lower accuracy. Without electronic calibration, the static tolerances are not compensated. What we have seen so far is that without calibration, the accuracy will be reduced to around 0,3 °. The electronical resolution however will remain unchanged. It is highly recommended to consult with our application team before you waive this step.

8. Any other resolutions available?

As of now, we set up our standard electrical resolution for the Singleturn (17 bit) and max. counts for Multiturn (16 bit). For lower resolutions/revolution-counts please mask the bits you do not need. For customized versions, please contact our application team.

9. What is an energy harvesting system based on Wiegand-Effect?

Please have a look at our Wiegand Sensor page.

10. Preset does not work - neither by hard ware Pin 2 (rose) nor by software register 0x6D.

This preset pin and register has been reserved for future implementations. It is not active for present versions of the encoder.

11. Switch over cw and ccw counting direction does not work at register 0x6C.

This register has been reserved for future implementations. It is not active for present versions of the encoder.

12. How do I read the encoder temperature?

Please refer to our formula at the encoder manual section 5.2. The value you get from register 0x66 has an offset of 50°C. To get inside temperature of the encoder in:
°C: T_(µc)=T_([reg 0x66])-50
°F: T_(µc)=1.8*T_[reg 0x66] -58

13. Is the encoder sending binary- or gray- code?

Output is binary coded.

14. Manufacturer code is stated at the manual register 0x7E/F “0x46” and “0x52” but I cannot find this code at the BiSS home page.

Our manual contains a typo. Correct is register 0x7E = “0x46” and 0x7F=“0x72”. Stands for ASCII “F”, “r”.

15. Calibration of the encoder. What is cw direction?

Motors with clockwise rotation turn the shaft clockwise when viewed from the drive end (viewing direction from drive end to non-drive end).
In accordance with DIN EN 60034-8, the direction of rotation of a motor is defined as follows:
The direction of rotation is the direction viewed from the drive end.
The drive end is the side with the shaft extension.
For machines with two shaft extensions, the drive end is:
a) the end with the bigger shaft diameter
b) the end on the opposite side to the fan, if both shaft extensions have the same diameter.

16. What is the password for calibration I must write in register 0x6B?

It is 0x2A.

17. Does a faster encoder exist? Cycle time of 62.5µs is too slow for our application.

Yes, encoders starting with software version 1.1.2 are able to run with ≥50µs cycle time. BiSS clock frequency must be at least 2MHz.