Err 30 - How to replace ESC Controller?

[TrimmCreateBuilder]

Hello,
I have a China bought E-bike. It's a fat tire style commuter.

Specs:
750 W
Bafang Motor
C901 Display

Problem:
As I turn on the system the display flashes the system is on and then within 1 second it goes to Err 30.

I have a similiar model e-bike and plugged in the working ESC controller and everythig works fine except the display LED modules.
I have traced it down to the Display giving a err 30 when I plug in the ESC controller that works.
Hub motor works, lights work, Pretty sure Pedal assist works.

Attached are a few pictures of the labeled wiring and the ESC controller.

I am looking for help in replacing the controller.

I found one and not sure it' works.... ebay rep said its not compatible.

For 750W 1000W Brushless Motor Electric Bicycle 36V 48V 30A KT Ebike Controller | eBay

For 750W 1000W Brushless Motor Electric Bicycle 36V 48V 30A KT Ebike Controller | Sporting Goods, Cycling, Bicycle Components & Parts | eBay!

www.ebay.com.hk

Any help or suggestions is greatly apprecaited.

 

[Freddy1]

My opinion, go with the 30A KT controller if the dimensions work for where the previous 25A one was (usually 30A controllers are larger), and buy a genuine KT display of your choice. The current C961 seems to be a Bafang or clone display and likely not compatible with a KT controller. With a genuine KT controller, and genuine display you know there will be no compatibility issues.

For what it's worth I have the color KT LCD8H display and find it good. Much easier to program than the cheaper black and white LCD3. All the programming parameters are on the one screen, rather than having to flick through to a different screen for each parameter.

I went through virtually the exact same exercise as you. Out of the crate the bike didn't work with I believe was the same message. Electrical connections were cheap, etc, etc. So after a LOT of stuffing around basically I just rewired the whole thing with a new larger amp controller, new display, quality electrical connections everywhere, and it now works perfectly.

 

[Freddy1]

Just noticed, for the 30A controller you are considering, just about every picture of it has different phase wire connections. In one picture the controller is described as having a waterproof connector and SM connections (that's what I'd expect). A single 9? pin waterproof connector for the phase and hall wires, and SM type connectors for everything else. You current controller is all individual wires.

So no major problem, but you may want to clarify exactly what type of phase and hall wire connections it has. If it does have the now near universal 9 pin waterproof type, you would need to buy a 9 pin type cable, and modifying it by cutting the 'other' end off, stripping the insulation back to make a short adaptor cable. If the controller comes with all individual wires no problem, but you're still likely to have to fit matching connectors. Don't scrimp on buying a good crimp tool to do that job. Any SM type connection that need to be made require a special SM crimp tool just for that job. You may need to learn how to swap pins around in an SM type connector. Things like your pas may have a different wiring scheme to the new controller. There is no universal wiring standard for these Chinese bikes.

 

[TrimmCreateBuilder]

Hey Freddy1, Thanks good input again. I have a store very close by that is called MarVac and I can get anything there. Like a Fry's for electronic cable, crimping tools and soldering and more. Either way, thanks for the input, I am very good and cable/ wire stripping, crimping and using all av tools. I just find the ESC controllers kind of difficult to diagonse why these china bikes used the parts they used. Dog SMH

I am looking at these here:

36V 48V For 750W 1000W Brushless Motor Electric Bicycle 30A KT Ebike Controller | eBay

Find many great new & used options and get the best deals for 36V 48V For 750W 1000W Brushless Motor Electric Bicycle 30A KT Ebike Controller at the best online prices at eBay! Free shipping for many products!

www.ebay.com

or

For 750W 1000W Brushless Motor Electric Bicycle 36V 48V 30A KT Ebike Controller | eBay

Find many great new & used options and get the best deals for For 750W 1000W Brushless Motor Electric Bicycle 36V 48V 30A KT Ebike Controller at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Freddy1]

Good luck with sorting it all out.
Just stress again, if you need to crimp SM connectors it is an absolute must to have a different crimp tool to the 'regular' ratchet type. They are designed specifically for these tiny connectors. The point I'm getting to, the correct 'mini' SM crimp tools can be hard to find in general electronics stores. The ones they had in that type of store where I live did a crap job. With the correct tool it does it 100% perfect every time. I had to source mine online.