BBS02 PAS mode disable for throttle only operation

[NFN01]

Hi

I personally do not like the way the Bafang PAS mode works. I have tried multiple settings configurations with the programming
software and cannot achieve a comfortable setup.

I actually prefer to use the throttle because I have control over when and how much assist the motor gives me.
I tend to only use the motor on high rolling resistance surfaces, to get up speed, uphill slopes and off-road tracks.
Because the motor does not run all the time as it does in PAS mode, my battery range has extended by some 8-10 miles.

So is it possible to disable PAS operation leaving throttle only mode by removing the plastic encoder disc that is fitted to the back of the large
freewheel gear?

My reckoning on this that the PAS sensor will not pick up the crank rotation if the encoder disc is not fitted, therefore with whatever PAS level
set at the controller when you start pedalling the motor will not start. You will have throttle operation and if in the programming you have set
the throttle designated assist to by display command, you will have the 9 different levels of power available for the throttle.
This will also eliminate the minimal pedal assist you get on PAS zero with having to set current limit to 1 in order to allow throttle operation
with some controllers. (mine included).

Anyone have any thoughts on this idea?

Thanks

N

 

[toxie]

So you get powered assist even in PAS 0? That's interesting. My BBS02 from EM3EV does not draw power in PAS 0 when pedaling. So perhaps you can get the same functionality by reprogramming your motor in a similar way?

 

[NFN01]

So you get powered assist even in PAS 0? That's interesting. My BBS02 from EM3EV does not draw power in PAS 0 when pedaling. So perhaps you can get the same functionality by reprogramming your motor in a similar way?

No it does not work, I've tried all possible combinations for level 0 and have to set the level 0 current limit to 1 in order for the throttle to work on PAS 0. But this unfortunately means you get 1% assist on PAS 0 when pedalling.
Also, through reading other threads, Bafang may have updated the controller firmware which now removes the ability to have throttle only on PAS 0 with no pedal assist.

I have the same issue my spare 750W controller.
Next time I strip the motor for its regular re-grease I'll re-assemble it without the encoder disc fitted and see if it works.

 

[NFN01]

My reckoning on this that the PAS sensor will not pick up the crank rotation if the encoder disc is not fitted, therefore with whatever PAS level
set at the controller when you start pedalling the motor will not start. You will have throttle operation and if in the programming you have set
the throttle designated assist to by display command, you will have the 9 different levels of power available for the throttle.
This will also eliminate the minimal pedal assist you get on PAS zero with having to set current limit to 1 in order to allow throttle operation
with some controllers. (mine included).

Hi

I removed the encoder disc and it operates as above. (I have 100% throttle as mine is set to use level 9 only at the moment.
I will re-program later, to use "by display command" on the throttle settings tab).

For those who don't want PAS at all. This is a solution. But it does require dis-assembly of the motor to do it.

N

 

[xrpb11a]

Did you ever get around to programming differect throttle percentages for different throttle levels? If so did itvwirk as expected?

 

[gridlok]

You can disable the PAS by removing the female connector for the grey wire on the inside of the controller. Wrap it in electrical tape to keep it from shorting out on anything in case you want to hook it up again in the future. There are instructions on my website under the "Installing a Temp Probe article"

http://electric-fatbike.com/2015/06/07/installing-a-temperature-sensor-in-the-bbs02-unit/

Look at step 5

Karl

 

[NFN01]

You can disable the PAS by removing the female connector for the grey wire on the inside of the controller. Wrap it in electrical tape to keep it from shorting out on anything in case you want to hook it up again in the future. There are instructions on my website under the "Installing a Temp Probe article"

http://electric-fatbike.com/2015/06/07/installing-a-temperature-sensor-in-the-bbs02-unit/

Look at step 5

Karl

Hi Karl
Yeah I read it some time ago but didn't really want to mess around with the wiring. At least with my method, it is easier to do, but you'll get greasy fingers.
The other advantage is that it can be done without removing the motor from the BB and having removing the controller to access the connector.
Restoring operation is just a case of re-fitting the encoder disc.
Both methods in operation work as well as each other so it would be a case of preference as to which method one would want to use.

I like the temperature monitoring method which I might adopt and take one stage further, because I've got a better thermometer than yours.
It's programmable and has an internal 25A relay. Therefore I can use it inline in the battery cable to disconnect the battery when the motor
gets to a certain temperature and when it falls to safer temp, re-connect the battery. (Basically a programmable thermal cut out for the motor).

Did you ever get around to programming differect throttle percentages for different throttle levels? If so did itvwirk as expected?

No I never tested this as I want full power available at all times, so I left my programming unchanged (I get full power on all PAS levels on throttle but no PAS functionality).
I will at some point hook up to the programming software and set the throttle to use "By Display Command" to see if it does work (currently it is set to use level 9).
When I do it I'll also set Level 0 to be 0 (no motor function at all).

N