Sabvoton and 3000-5000w hub motor setup

[jakmobile]

I recently acquired a fully assembled s73 clone that has a Sabvoton SVMC 7280(M) and a 16" hub motor that is supposed to be 5000w. When I first received the bike I wanted to replace the brakes/calipers with 4 piston brakes, which I've done but while in the process I decided I want to understand from top to bottom how the bike functions and how to configure the controller and motor. When I got the bike, the motor was working/ish but I had to replace the display (old one was fried) so I realized at that point how little I understood how to configure these devices. My background is network/security/cyber engineering so I figured that I should be able to figure out how to do a basic config.

Not so much. I've replaced the display and that's working fine, and being OCD, I decided to go through all of the wires coming from the controller and label them so I knew what did what. The bike also did not have any way of locking it so I decided to replace the twist throttle with one that has a digital battery display and a physical key. The original throttle had 3 wires (red/green and black) which I connected to the same color wires coming from the controller that the other throttle was connnected to but but I'm not getting much speed out of it and so I've been trying to determine where the other two wires go to and if if they have any effect for the throttle response. The remaining two cables from the throttle are blue and yellow. And I've been told that blue goes to "orange ignition to battery and yellow goes to "D+". I don't have any issue with splicing cables but I want to confirm where I should be splicing them and what should I expect as a a result of these two connections? I would expect one to actually illuminate the display and I'm not sure about the other. Would someone mind helping me figure this part out?


Sadly I haven't been able to complete that task, nor have I been able to use MQCON to configure the controller and motor. I've downloaded the MQCON software to my iphone and purchased a decent bluetooth adapter from Amazon to do the configuration and that's about as far as I got. I've disconnected what I think is the display connection and have attempted to connect to the bluetooth adapter via MQCON but the app isn't even seeing it to connect to it. I've deleted and reinstalled MQCON but nada, any idea what I'm missing?

Once I can get these two issues figured out and I can do the hall test and angle (I somewhat understand what that does but I couldn't explain it if I had to. I also seem to have some ghosts in the wires as the brake lights do not work, the turn signals don't flash and I think that's about it. haahahaa.

Anyway, would anyone be willing to help me out with this? I'm sure all of these questions have been asked in some way shape or form before and i've tried to do research before asking for help but I think I'm at the point now where I actually need feedback and more than what info I'm getting from the current youtube videos out there. I know that this website prefers these discussions to take place in the forum but if someone is willing to help and would prefer talking on the phone or some sort of virtual call, I'd be down for that. I'd even be willing to paypal some cash to you if you can help get this bike back to it's prime.

Thanks!

 

[jakmobile]

I can also try doing this from a windows laptop (I also have a macbook) but I'll have to track down a USB-USB cable.

 

[dominik h]

A normal USB-Cable will do nothing, you need a special one from MQCon. The same with a normal Bluetooth Module.

When I started with the SVMC72150 years ago, I had the same issues. My phone first didn't see the Bluetooth Module. But the Android tablet has recognized it.
Then I tried again with the phone.
You must not connect the phone to the ble Module, otherwhise the software will not find it anymore.

Probably mqcon also made a newer software Version, but that I do not know as I left the sabvoton/ mqcon route a few years ago, as these Controllers can't handle flux weakening very well, and kill themself with unloaded wheels.
I had a dead SVMC72260 and a dead SVMC72150 in 2 months and the second SVMC72150 without flux weakening activated survived 3 years without any problem in exact the same setup. (190kg scooter with 21S100Ah battery).

 

[jakmobile]

When you say a special USB cable or bluetooth dongle can you provide me a link to the ones that work with MQCON? I'll probably end up replacing with fardriver at some point but not until the current hardware.I have is still working, ya know?

What exactly does the flux weakening do?

 

[dominik h]

Flux weakening, also called weakening field, does enlarge the rpm range of the motor over it's natural voltage given limits.

Can't give you a direct link as always my Aliexpress App opens

 

[jakmobile]

I actually found the link to the bluetooth adapter and the USB cable. Thanks. Once I get those in a few weeks can log into the controller, I'll need some more help. I do have a few questions now though. If I make changes to the Sabvoton controller through the display, do those config changes actually do anything or do they need to be done on the controller themself? What about the motors config? Is there any actual configuration that goes on the motor or is just controller config as well? I started going through the config settings.I could view though the display and used META AI which was somewhat helpful but the fields don't always line up. I.e. config p01 on the display might be different. Some of the config settings really don't make much sense to me. Using the Sabovton, are there any configs that are always done the same? If so, what configs are those and what values are used?

 

[dominik h]

Can't help you with a display.
I never had one.

The controller can do a hall shift angle learning routine, but I guess that was already done before, so no great changes will occur.

 

[jakmobile]

The angle routine was probably done but I'd like to do it again. Is there any harm in doing that? What are some other common things i should do with the controller and or motor?

 

[dominik h]

Nothing can go wrong. The motor has to be unloaded during the test (wheel in the air).
You can set battery and motor current, under- and overvoltage, reacting time on throttle changes and the throttle midpoint.
The last sets the relation from the phase current to the twisted throttle and is for me completly outdated, because at full speed you can only use the first 30-40% of your throttle.