BBS02 not working no more

lately I have the phenomenon regularly when I cut throttle, the motor refuse to start up again
when I switch off and on again, the motor start up again
today I have it again, but now the motor refuse to start up again!
Without any error on the screen.
I have change throttle but nothing changed

Could it be a faulty brake cutoff switch? Does the LCD display the braking symbol when the issue occurs?


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No, no picture of brake.
I disconnect the brake connection.
I think it is the controller.
I bought a new one. It seems that that the condenser is defect. It looks a bit Bol.

changed the controller and the motor worked again

this controller have done about 2000km and already broke, this is mine third!
I shall try to change the condensor

Sure looks like that capacitor has failed. I would try replacing it and see if the controller works again. Capacitors are cheap and easy to replace.

The motor worked again good for some time
then the problems start again
the motor stopped working
disconnect power, start up and worked again
the I go for one large trip 100km
I open throttle motor work, when I close throttle, when I open again motor do nothing
then suddenly the motor work again
that happend a number of times
when I open the throttle open for some time, I see on screen that the power changed from full and fall to half
and again full, when the motor has warmed up it worked flawlessly
on destination I see when I start up, the motor stopped
then worked again.
after cooling the motor, I want to start up again
the motor stopped, start up again this after a number of times, the motor stopped compleet
I see on screen sometimes controller error 30H than sometimes 4H
the battery full are giving on screen empty and switch again to full
all nonsens on screen sometimes 91km/h then 0
Next day, I startup, nothing happend on screen
I connect another screen I see error 8H hall sensor
This is the second hall sensor I renew.
But when I start up after renewing the hall sensor, the screen stays black
So I think the controller is again faulty
This is mine 4the controller for the bafang BBS02
enough :x

I give the BBS02 15S, load max 61.5V, mayby therefore the controller fail after time
Therefore I want to change the bafang controller to an phaserunner controller
Then I can load battery to 63V and give 25A
The controllers from bafang are the weakest link from the BBS02 engine
there are two connections on the controller do I need to connect both?

the white and the black?
I do not use PAS Pedal Assistant Sensor grey cable from Hall sensor is not connect
Suggestion why screen stays black

I think your voltage is too high for the stock controller's capacitor ratings! I would not push it beyond 14S.

My bbs02 did that within the first 100 miles. I had an older unit that was cranked up to 29a though, so that might have been a factor. The cutout was kind of random.

Its a major reason why i sold it after a few months and went back to hubs.

It sounds like a bad connection somewhere between the controller and the display unit. Logic power for the controller comes from the display. Since you seem to have the same problem with two controllers, that would point to the display.

I have try with other cable and other screens

That is strange. Seems like a failure to communicate between controller and display that's random. Possibly noise getting into the data lines.

After that much trouble, I would probably take a big hammer to it. The BBSHD has a much better track record.

For configuration of the phaserunner
I need parameters for it RPM/V
Anybody know it?

fechter said:

That is strange. Seems like a failure to communicate between controller and display that's random. Possibly noise getting into the data lines.

After that much trouble, I would probably take a big hammer to it. The BBSHD has a much better track record.

Click to expand...

You don't think it has anything to do with overvolting the thing? He's using a fully charged voltage right up against the capacitors' ratings (before noise and spikes) and popping them. That's not strange; it's predictable. I doubt the BBSHD would differ much in that regard.

That is my bet. Capacitor ratings are not conservative! You need margin for surges and spikes. Put a scope on the power when the motor is running and you will see spikes that are way higher than the nominal voltage.

When the problems occur it's was raining
mine first controller, it's was havy snowing
maybe water seepage
I have removed the silicone from controller
and I see black powder on both side of the board
View attachment 5

View attachment 3
View attachment 2
I have start the autotune from phaserunner
I don't know Kv RPM/V for starting autotune
so I guess and changed the RPM/V till it worked
The program give then other Kv RPM/V I go back and
start the autotune for 4 times
then I get:

And the motor worked very good
Now the motor don't have the heat of the controller no more

I have start the autotune from phaserunner
I don't know Kv RPM/V for starting autotune
so I guess and changed the RPM/V till it worked
The program give then other Kv RPM/V I go back and
start the autotune for 4 times
then I get:

And the motor worked very good
Now the motor don't have the heat of the controller no more
View attachment 1

jpc6000 said:

When the problems occur it's was raining
mine first controller, it's was havy snowing
maybe water seepage
I have removed the silicone from controller
and I see black powder on both side of the board

Click to expand...

Oh, that explains things. Obviously the board was exposed to water even through the potting.