Sabvoton 72150 Throttle Issue

[MobiusClean]

So I bought a Stealth Bomber that was ridden very little and put together very well.

That said, I don’t think the guy i purchased it from fully sorted the throttle. It has an 8000w hub motor and a Sabvoton SVMC 72150 controller.

Symptoms: On my first (and only so far) ride on it I put the PAS on 1 and began to pedal away and suddenly the throttle kicked in FULLY. While the acceleration made me laugh, it lasted way too long and was way too abrupt. It probably lasted 3 seconds before it slowed. The same thing happened when i used only the throttle - full throttle for 3 seconds before it backed off.

My question is how do I set the controller so the throttle is less abrupt and makes a smooth acceleration instead of going full and taking so long to stop accelerating? Any help will be greatly appreciated.

 

[amberwolf]

Does it use the Cycle Analyst to process the PAS and throttle before reaching the controller? If so, you can go to ebikes.ca and find the manual for that version (it has the firmware/hardware version at power up on screen), and then get into settings and note down the present throttle mode, and then change it to PASSTHRU. This directly sends without delay the throttle signal from your throttle to the controller. If the system now responds without delay, the problem is in the CA settings. Change the throttle setting back to what it was, and then we can figure out what to change to fix the problem.

If you choose to experiment on your own, *always* write down *all* of the settings in *all* of the menus before you change *any* setting because some settings can interact with others and might change their values without you knowing what they were, and then you now have a much more complex problem on your hands if those values change behaviors you didn't want changed.


If the delay still exists, (or it doesn't use a Cycle Analyst) the problem is in the controller, and you'll ahve to find the manual and software for that controller and the hardware necessary to "talk" to it, and then figure out what settings in that software affect reaction time, and fix them. You can post what you find for controller settings you find it has at present, and then someone can help figure out what to change.

Some controllers that are programmable don't have software to do it, but only menus in a controller-specific display, so you'd need the display/controller manual to figure out what those settings are and which could fix the problem (if any).

If it isn't a programmable version of the controller, and has no display menus you can change, but it is what is causing the delay, then you'd probably have to replace the controller with one that doesnt' have a delay.

Note that unless it uses the CA to interpret the PAS and make a throttle signal, virtually all controller PAS operation is just on/off at whatever the present assist level setting is. So if you pedal, at all, you get all of the speed or torque or power or whatever that assist level is configured for. If you don't pedal, you get nothing. In most of them, the throttle is not affected by the PAS level, and always provides a full range of control over the motor speed or torque or power or whatever the controller is configured for.

 

[MobiusClean]

Thank you - appreciate you taking the time to answer and provide advice and tips very much!

I believe the previous owner did not use Cycle Analyst for initial setup - he sent me the link to the MQCON manual for setup. I will have to do a deep dive into that for the throttle adjustments.

Cheers,

 

[amberwolf]

Just so you understand, and can properly troubleshoot the problme:

It doesn't matter if the PO "used the CA for initial setup"--if the CA is built into the system and is wired up to the PAS/trhottle, and sending the throttle out to the controller, then you must figure out how the CA is presently setup, and then correct it's setup (if wrong) to work the way you want.

 

[Mywpn]

Thank you - appreciate you taking the time to answer and provide advice and tips very much!

I believe the previous owner did not use Cycle Analyst for initial setup - he sent me the link to the MQCON manual for setup. I will have to do a deep dive into that for the throttle adjustments.

Cheers,

You need to go into mid voltage on the throttle and crease the figure. I used to buy sabvoton all he time. But they are not like they used to be. The components are all be replaced with some cheap shit components and qs say it was an upgrade yet the later 2 I’ve brought both popped way to easy. Certainly no upgrade. The throttle for the sabvoton are a very violent throttle acceleration. You can lower phase amps and it will also make it a lot more useable and a domino pot style throttle. That made a huge difference. But all in all it always will have a touchy throttle socially when running high amp figures