Bafang BBS02 750W Can bus throttle will not go over 10mph

[34Ford]

For those of you with a Bafang BBS02 750W Can bus and possibly the DPC010 display have any problems with throttle only, not going over 10 mph even if you choose the max mode?

No one has been able to help over on the Bafang mid drive group and Bafang is no help at all. I am about to blame it on the throttle itself. My PAS works fine.

So I brought the throttle in and connected 6V to it if I am correct it should have put out 6V at full tilt. But all I got was 4.6V. I am considering buying the more popular throttle I see for sale verses this one I have pictured below. And this is the problem with both of our ICE Adventure HD's.

 

[docw009]

If your throttle uses the S49E linear hall sensor, the output will be lower than the supply voltage because of the design. In fact, this data sheet says it's typically .8V lower, up to a max of 1V volt lower. Anyway, it will never be as high as the supply voltage,

Probably not a throttle fault then, but may be a setup problem in the canbus controller. The throttle voltage range is something that can be set in the uart model.

 

[34Ford]

I have tried every setting either in the display itself and in the GO app. Even tried maxing out every PAS mode. Pedaling modes works great. No changes effects throttle.

 

[TommyCat]

Hi 34Ford,
As you got such a low output @ WOT with a bench testing 6 vdc. I'd be curious what you're getting when connected and tested on your system.
Does the supply voltage hold up to the throttle? I.E. maintain constant acceptable supply voltage.
What are the values at the home and WOT positions of the signal output.


Regards,
T.C.

 

[34Ford]

T.C. I'll have to get back with the results as that will require some figuring out how to get access to the pins in the wiring.

 

[amberwolf]

So I brought the throttle in and connected 6V to it if I am correct it should have put out 6V at full tilt.

That would be the case with a potentiometer throttle, which acts as a simple variable voltage divider, and has "no" voltage limits (within reason) for supply voltage.

A hall throttle doesn't work the same way, and has a much lower voltage output (than the supply) at WOT, and also does not go to zero volts at fully closed (off). They also have a limit to the supply voltage, which is typically around 5- 6v depending on the specific sensor. The bafang systems themselves should be supplying 4.3-5.0v to the throttle, so any testing done should be done at the actual supply voltage to be sure you get a relevant result.

As TommyCat points out, if hte supply is too low, so will be it's output.

For those of you with a Bafang BBS02 750W Can bus and possibly the DPC010 display have any problems with throttle only, not going over 10 mph even if you choose the max mode?

Did the system ever work as desired?

If so, what happened or was done just before the problem began?

If it never worked as desired, my guess is you have a system designed for a market area whose legal definitions of an ebike include a restriction in speed throttle usage, though I don't know of any that limit ot 16kmh (equiv of 10mph). Or is otherwise firmware-limited so that regardless of any settings the user chooses, it won't exceed that speed under throttle.

T.C. I'll have to get back with the results as that will require some figuring out how to get access to the pins in the wiring.

There are extension cables you can get for various Higo/Julet/etc type plugs that you could cut open in the middle to get access to the wires, without compromising your system's actual wiring.

 

[neptronix]

thoughts..
- do you have a wheel speed sensor installed if so, on what wheel?
- does changing the bike wheel size in the display affect the top speed?

 

[34Ford]

thoughts..
- do you have a wheel speed sensor installed if so, on what wheel?
- does changing the bike wheel size in the display affect the top speed?

Yes. The sensor is on the left 20" wheel. I forgot to mention that this Bafang is on a ICE recumbent trike. The rear wheel is a 26". On my display I have the wheel diameter set at 20 inch and on the wheel perimeter I have it set to 151.5cm.

 

[neptronix]

What happens if you set it to 16 inches, or run it on the back wheel?

 

[TommyCat]

How ‘bout this…

Does the indicated speed go 0 to 10 mph from the throttle home position gradually and linearly up to WOT?
Or does it reach 10 mph somewhere first in the middle of the throttle‘s stroke and then hold it there up to WOT?

Is the 10 mph speed read accurate? I.E. Compared with an accurate source or perhaps a GPS device.

 

[34Ford]

How ‘bout this…

Does the indicated speed go 0 to 10 mph from the throttle home position gradually and linearly up to WOT?
Or does it reach 10 mph somewhere first in the middle of the throttle‘s stroke and then hold it there up to WOT?

Is the 10 mph speed read accurate? I.E. Compared with an accurate source or perhaps a GPS device.

I can nail the throttle in any of the 5 PAS settings and it ramps up to 7-10mph then levels off and stays there. Now if I use the pedals it is easy in eco and a bat outta hell in boost. It moves great in boost and when I get into 14 gear (Rohloff) I have hit 28mph at one time.

 

[34Ford]

I have adjusted everything related to power either from the display itself and also in the GO app. I have even maxed out each setting and still no better for the throttle.