Smart pie 4 internal short circuit?

[Swedguy]

Hi, I am new to this forum and as of last week a first time owner of a Golden motor product, a Smart Pie 4 26" front wheel. Yesterday, after several hours of work I finally went out for my first test drive. It worked only intermitentely because there seemed to be a poor power connection somewhere. It now seems as my sadle post mounted 36V10Ah GM "frog" battery has one faulty (+ pole) connector that might have caused a spark to the battery cradle under the saddle. Anyway, the biggest problem right now is that the SM4 wheel is constantly applying a braking torque, even after disconnecting the battery and all other cables. Measured voltage of battery is still 40,3 V but when I measure resistance over the power cables to the motor I get 0 ohm. To me this means SM4 internal short circuit. The motor doesn't react to throttle, display shows nothing and leds on throttle are dark. Any thoughts on this, where do I go from here?

Sincerely, Swedguy

[Bikemad]

Hi andto the forum.

It sounds like the controller has definitely died. If the motor is hard to turn with the battery disconnected it is probably because one or more of the MOSFETs has failed and you will need another controller.

You will need to contact your supplier and explain that your battery is faulty and has damaged the controller.
It might be a good idea to take a photo showing the problem with the battery wire so they can see the problem.

Alan
 

[Swedguy]

Thank you very much for a quick and accurate reply! Quite a bad start for me and my Smart Pie set though, I hope I don't have to spend a lot to get it to work correctely now.