LAVAGIRL - tomiboi MTB | ubox v1 | 12s8p p42a | Luna 350s | Reacher 6485s

@haven damn bruh that is fucking gnarly. Glad you are not injured in a very serious way.

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Damn! I would definitely replace the helmet after a spill like that at that speed. Sounds like you can get a discount on a new one though from TSG if yours saved your ass though

Sucks about all the broken bits on the board :weary:

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I second this, I just had it happen recently. All of a sudden, too. Thankfully, I was not going fast.

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What is/causes ABS overcurrent?

As far as i’m aware its a current spike beyond your abs max current setting. It can be caused by a number of things (like shitty/intermittent connections), but for me I’ve only ever noticed it under heavy load.

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It’s a power loss caused by software, a fault error code.

You can also control the length of time it lasts. I usually turn this down to 85ms from the default 500ms.

Can be many things. Bad settings, loose connections, too high of a load, even the wrong kind of bumps/pebbles can exacerbate other things to cause it.

First thing I’d check are your settings, then connections.

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I was throttling on a downhill slope, so I shouldn’t have been pulling toooo many amps… I’ll examine the connections regardless.

Were you at or very near the board’s maximum speed?

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Yes.

Did you have field weakening turned on?

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Try changing Maximum Duty Cycle to 16% and Duty Cycle Current Limit Start to 14%.

Then test out the top speed behavior at a crazy low speed you can easily run off if needed. Try to replicate the problem and/or see if it exists.

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Could it be thermal throttling? I’ve had motors thermal throttle one before the other, which also threw me into a wobble.

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I suppose it’s possible, I didn’t check temps afterwards

But it was only 2-3 miles into my ride on the new Reachers, bout 45 degrees F outside… not really likely imo

You should check what the beta value is for the thermistor in your motor and compare it to the one set in your ESC.

If it’s off it could think the motor is overheating when it isn’t

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oh jeez, can u explain this like i’m 5?

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On the bench, do your motors crackle when you hold full throttle?

I had an issue running a Ubox V1 and a UART remote that caused a similar failure mode as this, although it didn’t happen severely enough for me to fall.

Also, what FW are you running?

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actually yes, i was dealing with some crackle on one side – however i believe i narrowed the noise down to the spur gear. when i moved the spur gear to the other side the chatter followed. was planning to replace soon, but the board was running fine/sounded good under load up until the fault occured

running fw5.3

Interesting, maybe it wasn’t the same thing then.

My experience on 5.3 was crackling on the bench while holding full throttle with correct duty cycle current limit start settings. Everyone said the issues would go away while riding, but they didn’t, and instead tried to lock up a motor on me. I observed the same motor locking behavior on the bench.

When I changed duty cycle current limit start to 95% on only the side connected to the receiver, the crackle went away and I could hold full throttle at top speed without issue, both on and off the bench. I’ll try and pull up a video of how it sounded.

Either way, I’m glad you’re relatively ok and your gear did its job. It sucks having to replace parts and rebuild confidence :confused:

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Replace it.

That helmet is only fit for hanging on the wall so you can brag about how your good gear saved your life. Never wear it skating again. Helmets can look “fine” after a serious crash, but are in reality completely compromised and will not save you next time.

Whatever a new helmet costs, be happy you are paying that instead of medical debt or funeral bills. A new helmet should be the first thing you buy, before even thinking about a new axle or wheel or whatever.

I’m not just talking out my ass either. I went down a few weeks ago, and my helmet saved me from what would likely have been a traumatic brain injury. I lost traction on wet pavement, spun around, and went down directly backwards onto the back of my head, “I love helmets” style. Got up and walked away without even a bruise on my noggin. My helmet looked fine at first glance. On closer inspection, the shell was all mushy where I smacked into the ground, and the foam was shattered in serveral interesting places all around the helmet. I ordered a new one that night, thankful that I had found a helmet that had worked so well.

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