Rassy
1 MW
As most BBS02 and BBSHD enthusiasts know, Bafang introduced a change in 2017 that changed dominance from the throttle to PAS which resulted in poor throttle response when you were also pedaling, even in PAS level 0. I took part in an experiment with guidance from Fechter to make an electronic change within the controller cavity which returned dominance to the throttle and made the 2017 and newer controllers perform the same as the earlier controllers. This is well documented here:
https://endless-sphere.com/forums/viewtopic.php?f=28&t=93977
After working great for three years my DIY fix started failing and I removed the fix to verify that the controller still worked as it had originally. It did work as original, but instead of redoing the fix I decided to try something different that did not involve any delicate electronic installations. So right, wrong, or indifferent here is what I did:
First I cut the small grey PAS wire in half. This wire is in the controller cavity and is one of the four wires attached to the small connector. Do not confuse it with the grey wire attached to the five wire small connector which also includes a blue wire.
Then a new wire was connected to each loose end of the grey wire where it was cut and these two new wires were run out of the controller cavity. I used a small two wire conduit and cut a small piece of rubber from the top of the area where other wires pass into the controller. This controller already had some potting removed from that area, so with a new controller you may have to remove a small amount of potting. I have not sealed around the new wire yet, but will do that later.
Then for my initial testing I ran the two wire conduit to a toggle switch mounted on the handlebar. Everything worked as expected, namely when the switch was closed the BBS02 worked the same way as when it was delivered. And when the switch was open the PAS was turned off and the throttle worked properly in all PAS levels whether you also pedaled or not.
It was very easy to smoothly transfer from using PAS to using the throttle and vice versa, but it was a nuisance to have to flip the toggle to make the transfer. So I considered various options that would allow me to eliminate the toggle switch. I finally settled on a simple option of using a latching button switch handy to the opposite thumb from whichever side the throttle is on.
For me, this was a perfect solution, because I already had a latching button switch at that location. This switch was connected to the brake circuit so that I could easily cut off the PAS in situations such as when encountering heavy pedestrian traffic on a multi-use path, etc., and I used it often. Now, the same button serves the same purpose even though it doesn't kill the entire system it does kill the PAS, which was all that was really needed.
https://endless-sphere.com/forums/viewtopic.php?f=28&t=93977
After working great for three years my DIY fix started failing and I removed the fix to verify that the controller still worked as it had originally. It did work as original, but instead of redoing the fix I decided to try something different that did not involve any delicate electronic installations. So right, wrong, or indifferent here is what I did:
First I cut the small grey PAS wire in half. This wire is in the controller cavity and is one of the four wires attached to the small connector. Do not confuse it with the grey wire attached to the five wire small connector which also includes a blue wire.
Then a new wire was connected to each loose end of the grey wire where it was cut and these two new wires were run out of the controller cavity. I used a small two wire conduit and cut a small piece of rubber from the top of the area where other wires pass into the controller. This controller already had some potting removed from that area, so with a new controller you may have to remove a small amount of potting. I have not sealed around the new wire yet, but will do that later.
Then for my initial testing I ran the two wire conduit to a toggle switch mounted on the handlebar. Everything worked as expected, namely when the switch was closed the BBS02 worked the same way as when it was delivered. And when the switch was open the PAS was turned off and the throttle worked properly in all PAS levels whether you also pedaled or not.
It was very easy to smoothly transfer from using PAS to using the throttle and vice versa, but it was a nuisance to have to flip the toggle to make the transfer. So I considered various options that would allow me to eliminate the toggle switch. I finally settled on a simple option of using a latching button switch handy to the opposite thumb from whichever side the throttle is on.
For me, this was a perfect solution, because I already had a latching button switch at that location. This switch was connected to the brake circuit so that I could easily cut off the PAS in situations such as when encountering heavy pedestrian traffic on a multi-use path, etc., and I used it often. Now, the same button serves the same purpose even though it doesn't kill the entire system it does kill the PAS, which was all that was really needed.