BMX – LCD03 E06 Errror

[tndr_1]

Hello!

I turned the throttle (without pedaling) at a red light and bike just died. I do not know if it had something to do with me blocking the pedals causing sudden extra peak that made it burn or something. But could have! In the display, I have set it to 50% power, just so you know.

This is the kit i ordered from Leafbike: https://www.leafbike.com/products/d...ike-conversion-kit-1355.html?VariantsId=11264

60V 2000W with LCD03 and it runs so great, when it works. hehe.


So I contacted Leafbike support which answered quickly and gave me great instructions on what to try, so I started to troubleshoot the controller and I had friction in the motor when turning it by hand. I can just describe it as I "felt" the magnets inside the motor when turning it.

I do not know much about the electronics, but I did it like this:
Connected ONLY yellow phase -> no friction
Connected ONLY green phase -> no friction
Connected ONLY blue phase -> friction

So I just ordered these mosfets: https://www.aliexpress.com/item/100....order_list.order_list_main.11.24671802UHRzrl and replaced all mosfets on the blue phase. This removed the friction. So I thought I had some success, but turning everything on again and twisting the throttle resulted in the same error as before "E06 Info" on display, and no turning motor.

So currently I am out of luck. I do not know what more to do here and I don't wanna just go and buy a new controller before I have tested everything I can here!

I hope anyone here can give me some advice

/ Oskar

 

[tndr_1]

Hehe, after I started this thread I began to rumble around with the bike again after being on a pause from it. And I somehow got it to start rotating again. I do not know how. I suspect a loose hall sensor wire in the hall connector, because I had to detach those when I replaced the free wheel.

So yeah, it is ROTATING now actually. But I haven't tried it with load. BUT, it cuts off... I recorded a video instead of me explaining in text, I think it will get easier to understand this way

 

[docw009]

Error 06 is motor problem on LCD3. You correctly determined that the blue phase MOSFET's had a short. Replacingthem lets the wheel move. You still may have a circuit fault in the drive circuits to the MOSFET's. AT this point, unless you're good at this, maybe it is easier to replace the controller,

 

[tndr_1]

I’m still quite confident I can fix this so I will give it a go hehe.

But I did some more testing this morning. To see how it would perform under load just holding the wheel slightly when turning the throttle. The performance went gradually down and now the motor is not turning at all again so I guess the mosfets are toast once again!

Did I order and used wrong mosfets? https://www.aliexpress.com/item/100....order_list.order_list_main.11.24671802UHRzrl

 

[E-HP]

Hehe, after I started this thread I began to rumble around with the bike again after being on a pause from it. And I somehow got it to start rotating again. I do not know how. I suspect a loose hall sensor wire in the hall connector, because I had to detach those when I replaced the free wheel.

So yeah, it is ROTATING now actually. But I haven't tried it with load. BUT, it cuts off... I recorded a video instead of me explaining in text, I think it will get easier to understand this way

Can you post a pic of the controller label? Per the link you provided in your first post, the controller appears to be a JN controller, with displays compatible with JN. However, you state the system uses an LCD03, which is made for KT controllers.

What voltage is your display set to? If the display detects that the battery is dead, it will apply the low voltage cutoff and stop providing power. Since KT controllers may support several voltage levels, it will auto detect (guess) the battery voltage connected. You may need disconnect it, fully charge, and reconnect and hope it guesses right, provided the controller supports 60V nominal.

 

[tndr_1]

Yeah this is a good point and it is very confusing, but this has never been an issue actually. But I did reset the settings on the display now to what the supplier recommended and now the battery bar is back showing full battery. But still I can not get the motor to rotate.

There is no friction in the motor when rotating in manually with my hands.

 

[tndr_1]

Here is the controller label

 

[E-HP]

Here is the controller label

View attachment 382426

How was the bike ridden leading up to the failure? Do you know if either the controller or moto got hot?

I would test the motor phases (phase to phase, phase to ground) to rule that out as a potential issue before replacing the controller.

Testing BLDC motor's Phase Wiring - Hall Sensors and Wiring. - Electricbike.com Ebike Forum

Testing electrical components of a typical hub motor with a digital multi meter. First take a few minutes and look over the wiring going into the motor for cuts, scrapes, missing insulation and other wiring issues or poor connections that should be resolved first. Smell for...

electricbike.com

 

[docw009]

Here's a reverse engineered schematic for the S06 KT 16A controller. You can look at the drive circuit to get some ideas of what your controller may use, It's likely the same design philosophy, scaled up for 55A.

 

[tndr_1]

How was the bike ridden leading up to the failure? Do you know if either the controller or moto got hot?

So my free wheel is broken. It can lock up now and then. Very rare. Happened once. I was standing still at a red light and without any help from the pedals I turned the throttle and it made a clonky sound which I think was from the broken free wheel because I think I noticed the pedals moving slightly and maybe my legs was blocking the pedals to move when I turned the throttle.

No I do not know if controller or motor got too hot!

I would test the motor phases (phase to phase, phase to ground) to rule that out as a potential issue before replacing the controller.

Wow thanks for the link! Will def try this!

Here's a reverse engineered schematic for the S06 KT 16A controller. You can look at the drive circuit to get some ideas of what your controller may use, It's likely the same design philosophy, scaled up for 55A.

Niiiice! Very nice! This will be great for troubleshooting! Is my controller a S06 KT but 55A?

 

[tndr_1]

All right so christmas is over and I have done some more troubleshooting. Current status is that the motor doesn't spin at all, and I still get the E06 error.

From my measurements, the Hall sensors seem fine. And none of the phases are shorted.

Even tho I have the schematics now, I wouldn't really be able to fix the PCB because I do not have proper gear for replacing SMD components at the moment.

So I guess I will have to get a new controller.

I can get a replacement from Leaf Bike fro $72, but I would like to see options that are from more known quality brands. What is nice with the current controller is that it fits the BMX perfectly.

Which controller would you recommend for my setup? 60V 2000W

 

[E-HP]

All right so christmas is over and I have done some more troubleshooting. Current status is that the motor doesn't spin at all, and I still get the E06 error.

From my measurements, the Hall sensors seem fine. And none of the phases are shorted.

Even tho I have the schematics now, I wouldn't really be able to fix the PCB because I do not have proper gear for replacing SMD components at the moment.

So I guess I will have to get a new controller.

I can get a replacement from Leaf Bike fro $72, but I would like to see options that are from more known quality brands. What is nice with the current controller is that it fits the BMX perfectly.

Which controller would you recommend for my setup? 60V 2000W

what is your budget? If you don’t get a KT controller, then you’ll need to replace the display as well.

 

[tndr_1]

I do not know my budget really. Spent too much on this bike already, haha.

But $200 for a controller that I can consider reliable and somewhat programmable? Thanks for taking the time to help me!

I found this from Sabvoton... ~$180 with display and Bluetooth adapter: MQCON(Sabvoton) Electric Bicycle Controller Model SVMC7260

Could that be something?