Bafang BBS02B cuts power after 1 second

[kneeslider99]

Hi!

I have happy been using my Bafang BBS02B 750W 46V kit for 6 months with 52V battery (maybe this is the problem) and now when using the pedals OR the throttle the motor starts to ramp up power for a second or so then cuts the power, maybe the same problem but no solution reported here. If I stop pedaling and start again same thing, power for a second then cuts of. If I keep the wheel in the air and use the throttle the motor spins up for a second then cuts of but keeps the motor spinning at very slow speed, below walk speed. Walk mode works as usual.

I have checked the wires but no damage, no brake sensors or gear change sensor is plugged in. No error code. Yesterday I also removed the controller, connectors seams fine and no short to VCC (red wire) or ground (black wire). I checked according to this guide. I guess something else in the controller can still be faulty?

Battery is fully charged about 58.8V and when the motor cuts power the voltage on the display is still the same.

What to you think? Any ideas how to trouble shoot more? Could it be the BMS or controller? I have no parts yet to try to change with but what would be most likely problem be?

Many thanks!

 

[msmd]

did you ever find a solution? I have a g510 with the exact same issue. marc just_ride_ranch@yahoo.com

 

[kneeslider99]

I did some more tests the other day and it seams it may have been a loose connector at the controller. I don't know what connector but I guess one of the phases to the motor. Now I can run the motor with the throttle with no problem. I need to assemble it all and do some more testing but I have a good feeling. I let you posted when I have time for some more testing.

 

[msmd]

I did some more tests the other day and it seams it may have been a loose connector at the controller. I don't know what connector but I guess one of the phases to the motor. Now I can run the motor with the throttle with no problem. I need to assemble it all and do some more testing but I have a good feeling. I let you posted when I have time for some more testing.

Thanx.
Mine runs with throttle but stops peddling, then after rest, kicks in again to stop after less then one pedal revolution.

 

[fechter]

There are a number of faults that could cause the motor to stop. These include brake sensors, motor hall sensors, throttle hall sensor, battery voltage too high or too low, motor current too high, there are probably some more. Most sensor problems can be traced to bad connections or wiring damage. Do a close visual inspection on all the connector pins and sockets. It's also possible to have a flaky battery connection, either inside the pack or between the pack and the controller that may show normal full voltage, but drop out under any kind of load. You can try to measure the battery voltage going into the controller while trying to run the motor and make sure it stays reasonably steady.