KT-LCD5 Stop & Go problems

[Royfernandez]

I have a 6 month old e-bike 48v 15a motor & KT-LCD5 controller...the last 3 weeks the bike stalls in 3 minute intervals with absolutely zero power in both PAS & Throttle modes....when the bike stalls even with maximum pedal pressure the bike does not move & it appears that the brakes are holding it back...I checked the brakes and confirm that it works fine....Can anyone URGENTLY please help me because it really is very very frustrating to keep riding like this

 

[amberwolf]

If you disconnect the motor from the controller when this happens, will the wheel manually rotate normally then?

If not, then the motor itself has a problem causing a short between phases. This could be a problem in the axle wiring, but that typically is either random or a continuous short. With a short in the actual coils inside the motor, they can be fine until they get too hot, at which point thermal expansion of parts could cause a short. Then when they cool off, the short disappears.



If the wheel does spin normally when disconnected, then the controller is shorting the phases together. Normally this is caused by blown FETs, whcih are not an intermittent problem, but it could be the controller is entering a "lock mode" (antitheft, etc) due to a control failure, or due to overheating within the controller or the motor (if the motor has a thermal sensor). This may be a setting that has changed (even if not intentional, or even somethign that just changed on it's own for unknown reasons), or something the controller is doing to try to protect something. It could just be defective hardware.


Did it have any problems or symptoms before this current problem began?

Or did it just suddenly start?

If it suddenly started, did anything happen to the bike just before this? (rain, a fall, crash, anything)

 

[E-HP]

Is there something about the 4 pictures that you're trying to point out?

 

[justlooking808]

basically what's happening is the controller thinks your brakes are engaged and is cutting power to the motor. it seems like when you hit a bump, the switch in the brake lever is getting stuck and the ebike thinks you are pushing the brakes. that's why the motor is cutting off.

things you can try :
1. push in brake and let it snap back to resting position on both sides. (see if icon goes away)
2. disconnect brake cut of wire on one side and see if motor still cuts off
3. disconnect both sides and see if motor cuts off (be very careful with this as you lose your motor cut off when the brakes is applied)

i think 1 and 2 would help you find out which brake lever is not closing all the way. this usually happens if you crash your bike or lay your bike on the ground with the brakes/handle bar as a stand. i would make sure you make use of the kick stand and not lay your bike on the ground.

the brake switch kind of looks like this =D where the lever rest on the D to open the circuit so the bike know that the brakes isn't being pushed. once the brake lever is engaged in the slightest, it closes the circuit and cuts power to the motor.

i could be wrong, but at least you learned how the break cut off works.