BBS02 PAS runs 1-2 seconds, then cuts out

[gasmiley]

Hi All (first post) - Just bought a BBS02 with a 52 volt battery. Installed everything. Took it for a test ride. Here's the problem - when I use PAS I can feel the motor accelerating but in around 1-2 seconds the motor cuts out, leaving me to pedal without power. I put it on a bike stand and rotated the crank. As soon as the sensor passes the magnet, the motor starts, the wheel rotates under power, but the power cuts out in around 1-2 seconds. If I stop pedaling and then start again, once again I will get another 1-2 second burst from the moter before it cuts out. Is this normal? I was expecting continuous power while I pedaled. How can I fix this? (Will I need to order a power cable?) - Thanks - Gary

[brucee]

Hi gasmiley - did you ever find out what was causing this? I just put on a BBS02 on a trike and the exact same thing is happening. My throttle activates motor for 1 second then stops. pedal assist does the same thing. no variation based on changes on my display and no error codes on the display.

[RLB_Tech]

My BBS02 does the same if it lost the speed sensor signal. Discovered that when the magnet turned slightly on a spoke and sensor stoped to sens it.