Bafang Throttle Voltage question

[schosser]

I have a BBS02 and I am trying to validate the voltage on the throttle control wire.
It looks like the voltage being sent to the controller is 0 (no throttle) to 4.2 (wide open).
Is that pretty close to what it should be?
Thanks in advance ,
Bill

 

[fechter]

Yes, that should at least work. Normally at zero throttle the voltage is around 0.7v or so. Nominal range is 1v - 4v.

 

[FastJohnny]

Can I jump in here? Can you run a aftermarket 5V throttle with a BBS-02 of BBS-HD? Is 42 the highest setting in the bafang software? I don't have one anymore to check

 

[fechter]

I'm not sure exactly what the cutoff voltage is for the Bafang controller, but most similar units will fault over 4.6v or so.
If you want to use a Magura or other pot throttle, you can make it work by placing a fixed resistor in series with the 5v line.
Also good to have a resistor in series with the ground side so you don't have a large dead band starting out from zero.

The exact resistor values are in a thread somewhere. For a 5k throttle, they're around 1k to 1.2k.

 

[FastJohnny]

Great, that's exactly the info I needed. Thanks. I had a BBS02 with a twist throttle and it was terrible. I've fallen in love with the Domino 5k throttle that came with myour Tangent kit. I'm thinking about a bbs hd build with a domino throttle.

Thanks again

 

[schosser]

Thanks for the quick response..
My multi-meter can be a bit Fluke

Bill

 

[Fastest1]

Did you ever run the Domino with the Bafang?