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Bafang Ultra Drive programming

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  • ProphetZarquon
    replied
    Well, we've received our Frey ebike, & I can confirm that
    the Base Voltage value should NOT be at zero!

    Bafang ships these motor controllers with the torque sensing uncalibrated.

    ​​​​​The minimum value, at zero pedal force, which these torque sensors can output, is around 732 milliVolts.

    Anything below 730 mV in the Base Voltage field, is wrong.
    Far from a matter of preference, this is literally crippling the torque sensor:
    Set at 0 mV, the first 20% of torque sensing range is thrown in the garbage;
    Under any pedal rotation at all, ~"12 Kg" of pedal force is detected!

    Of course the torque sensing won't work well that way!

    Get a reading from the "TqVoltate" field, with no force on the pedals.
    Add at least +1 or +2 to that value, & apply that total to the Base Voltage.
    Congratulations! You have just calibrated the Base Voltage of your torque sensor.


    Setting the Base Voltage mV to 757 or higher, should prevent any baseline sensor jitter from being detected as pedal torque. (Unless your torque sensor is unusually erratic. If so, seek replacement as this is a safety issue!) ​​​​​
    Last edited by ProphetZarquon; 01-27-2022, 02:02 PM.

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  • Mike_V
    commented on 's reply
    Mind Reader do Tell the future
    Torque Sensor Def: You sweat while pedaling uphill like a donkey.

  • ProphetZarquon
    commented on 's reply
    I haven't been able to find a single guide that calibrates the torque sensor; it's as if no one has even tried. Seems impossible to ever get accurate torque sensing if the ranges detected are all still set to arbitrary default spans that probably aren't very close to calibrated *at* *all*...?!?

    Why does no one use the "TqVoltate" mV readings with a torque wrench or weights ¡or at least their leg force on the pedal! to calibrate the "Delta Voltage" mV ranges which assign the detected pedal force in Kg, if they hate its torque sensing so much?

    All this time spent working on all the OTHER settings to make up for lousy torque sensing, & yet the one group of fields which are definitely there to help calibrate the torque sensor, have only been given cursory guesswork at what the real ranges should be? Are those not the calibration fields!? (Delta Voltage) The live torque sensor readout seems to be available *right* *there*!? ("TqVoltate")

    I'm so confused by these guides, & the lack of real world sensor data reported back by users, so far.

    Am *I* the one that's missing something, or is it kinda everyone else?
    Our new Frey AM1000 is in shipping right now... I guess I might find out?

  • Lewis1
    commented on 's reply
    Feel like a right smeghead....the magnet was not lining up with sensor

  • Lewis1
    replied
    I have just had my Frey Ex Befang ultra. I bought cable from Frey. Tried settings you all set in chat but all I get is about 12mph, I just need max of 19-20mph due to UK LAWS also tried throttle off but had to put back and limit speed to 24kph
    I really need help as this will be my main transport due to epilepsy from stress only

    I have changed some settings after reading Biktrix site, but not tested yet
    I have tried many settings from varied sites and youtube but so far still stuck at 12mph and hard pedalling
    Last edited by Lewis1; 03-27-2021, 12:04 PM.

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  • zxhwk
    commented on 's reply
    just make sure your pedal assist is all 100 % look at the charts in one other post i have here

  • Steve--
    replied
    Originally posted by Steve-- View Post
    Does anyone by chance know whether or not I can program my ultra max so that the throttle will work from a stand still, without pedaling? The way it is now, I have to get the bike moving first before the throttle will work. Once I'm moving, the throttle will work, even without pedaling, but not from a stand still.

    Thanks
    Steve
    Any chance you could tell me what setting to change to achieve this?

    Thanks

    Leave a comment:


  • zxhwk
    commented on 's reply
    Yes you can I did my friends M2s bike for him because he knew nothing about computers that much and did not want to take a chance on messing anything up

  • Steve--
    replied
    Does anyone by chance know whether or not I can program my ultra max so that the throttle will work from a stand still, without pedaling? The way it is now, I have to get the bike moving first before the throttle will work. Once I'm moving, the throttle will work, even without pedaling, but not from a stand still.

    Thanks
    Steve

    Leave a comment:


  • pebecke
    replied
    Hallo zusammen
    Ich habe eine Grundsätzliche Frage:
    Spd 0 bis Spd100: Was bedeutet dies genau? Spd0 = Geschwindigkeit 0 in % oder Trittfrequenz 0%

    Da würde es ja Sinn machen, zum beispiel beim Bergfahren wo man mit "kleiner Trittfrequenz bzw. kleinem Tempo ca 50% fährt - die Start und Full Kg herunter zu setzen und nicht bei Spd100.

    Leave a comment:


  • AZguy
    commented on 's reply
    How would you "power the motor on" if the display is unplugged?

    You need it plugged in to a battery though but that's not the same as turned on...

  • eBikeaholic
    commented on 's reply
    Have you tried doing it with the motor powered off? ...I always do it powered off and have actually never tried it with the motor powered on.

  • Rob Neely
    commented on 's reply
    My first step is to power the bike on. Then I disconnect the cable from the display. Next I connect my communication cable to my laptop and to the bike. Using the 'controllerst_torque.exe' program, I enter the com port, (in my case, "COM5") then hit the connect button. The "Bandrate" window constantly scrolls and never connects. I know my bike is still turned on as I can hit the throttle and it will lurch. What am I doing wrong? I can't connect to the controller.

  • eBikeaholic
    replied
    Originally posted by Rob Neely View Post
    Hi,

    I purchased the "Bafang BBS02 and BBSHD Programming Cable" from Luna Cycles for the purpose of programming my Bafang Ultra (Purchased through M2S). I read through the online instructions and am having an issue with the bandrate for the software. Who may be able to help me out to see what I'm doing wrong?

    I downloaded the UltraMag Program. I found my com port (COM5) and entered my Bandrate (9600). For some reason, the Bandrate keeps scrolling and won’t fix on 9600. It’s begins scrolling after I hit the connect button, which is prior to me connecting the cable to my ebike. I tried running the program under windows 8, (my computer is windows 10) and that made no difference. I even used an older windows 8 laptop - still no difference. I cannot connect to the Ultra controller. Anyone have a similar experience with this?

    My goal is only to reduce power levels on level 1 and 2. I'm not even trying to increase power!

    Any help you can provide is most appreciated.
    Is the UltraMag Program you're using the same one as the 'controllerst_torque.exe' one from Karl's post on electricbike?

    I never had to enter the bandrate. After plugging the cable into the controller and the computer, then choosing the correct COM port - I click connect and it automatically chooses the bandrate. Does that help?

    Leave a comment:


  • eBikeaholic
    replied
    Originally posted by Letterman View Post
    Some excellent information here eBikeaholic, well done for figuring these things out.
    Two quick questions:
    - is the power delivery between MinCur and MaxCur liniar, depening on the pressure between StartKg and FullKg? What I mean is, if you have a StartKg of 20kg and a FullKg of 50kg, can the controller only deliver either MinCur or MaxCur power, or somewhere in between as well, if the pedal pressure is say 30kg?
    - if you set ReturnKg to 0, does this mean that the motor keeps running, even if you stop pedalling (potentially dangerous and reliant on the brake sensor working - if you have one), or does it still require for the pedals to turn (ie ghost pedalling without much/any pressure)?

    Thanks for clarifying!
    hmm... I'm not sure if the power is linear between MinCur or MaxCur, but so long as it feels like a smooth power transition regardless, would it matter? I guess we could play around with those to see if it feels any different but we'd somehow have to measure the kg going into the pedals at the same time, right?

    I have ReturnKg all set to 0 . I believe it allows the motor to keep running so long as the cranks are turning - even when there is no pressure on the pedals (ghost pedaling). The motor doesn't activate if the cranks are not turning,. If you lift the wheel or put it on a bike stand and the cranks spin themselves it will continue to run until you grab the pedal or tap the brake switch - otherwise that could be dangerous for sure, fingers beware.

    I recently converted the bike to Nexus 3 speed and shared a video showing how it feels... might be insightful.

    https://www.youtube.com/watch?v=MD1b...ature=youtu.be
    Last edited by eBikeaholic; 05-15-2020, 06:00 AM.

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