Noise from rear hub after indtaling Kt controller

[Janjuul40]

Hello.. i have a problem with my bike.. i have changed the controller, screen pas sensor to a kt system.. but now my rear hub is very loud noise everything time pedal i engaged.. before it had no Sound ? Any idea what the problem could be ? It sounds like a grinding Sound ? All system is brand new except the rear hub motor

 

[docw009]

I've found that KT controllers follow the wire color schemes used by other major brands. I wouldn't expect that the motor wires are cross-wired, but a miswired motor that runs will be very noisy with low power. That is something to check.

If you think the wires are correct, it could be a bad controller. Over a dozen KT controllers installed, I had one that caused the motor to growl after an install. The bike ran, but made a growling noise, It was a bad controller fresh from the seller. Something wrong with the electronics. New controller needed.

 

[Janjuul40]

But how to find out if it is miswirred ? Sorry i dont underetage completely

 

[Janjuul40]

I cant post a video? othervise you could have heard the Sound

 

[docw009]

Post a video on youtube and link it. If the bike can be ridden, I think it's probably the controller.

If both controllers used the 9 pin motor connector, then you can't miswire it.

If they used this kind, the white connector might have mismatched colors on either side.

 

[aroundqube]

Here is a flow chart for testing the wiring order if you have the second type of connectors shown above. Testing BLDC motor's Phase Wiring - Hall Sensors and Wiring. - Electricbike.com Ebike Forum It is the one at the bottom of the first post, Sensored BLDC Motors