Help please - my board has a speed restriction!

ESK8 Electronics
1

Hi,

This is my first build and I am new to VESC so looking for some help please. I just cannot get the expected power / speed out of my setup. I have a dual motor, TB 6355 190Kv, 36 tooth / 13 tooth with 83mm wheels running 12S lipo,(2 * 6S 3300 mAh packs in series, 60C). With this setup I cannot get more than 20km/ hr out of the board. When i go up hill, there is enough power to maintain the 20 km / hr but as soon as I level out on max throttle the power reduces and I stay at 20 km / hr. When going down hill I can max throttle but I draw almost no amps and I cannot get more speed.

I would greatly appreciate any help thanks.

Logs and settings below.

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Many thanks.

6 Likes
2

You have soft erpm limit turned on in the ppm tab, turn it off

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3

Yeah his erpm looks to be set at 15k

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4

And that is how you present your shout for help nice one

10 Likes
5

Ahh so the setting that says to limit my RPM actually limits my RPM … :slight_smile: Who would have thought ha ha

Thanks heaps for the help guys.

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6

“Pls help my board isnt going fest fest”

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7

This is a awesome example on how to ask for help. Not a single “post your…” “upload some…” or “what is your…?”.

Linking to this thread on the future when people post topics made up of a single question.

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8

He also has limit ERPM with negative torque checked. Should probably uncheck that on both esc

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I agree 100% with you, everything exposed on the first post

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10

Turned soft erpm off and tried on the bench. Crazy fast. Decided to simply increase the ERPM limit start and ERPM limit end to give me a max speed of 35km/hr. Went for a ride and it worked great.

BUT

Then I did a hard brake and it looks like I may have fried a VESC. One VESC / motor is not responding, flashing red indicating an error with a DRV8302 error whenever I apply throttle.

Could any of my settings have caused this? I did not yet uncheck “limit ERPM with negative torque” as suggested. Could this have fried my VESC on a hard brake? Any other suggestions?

Anyone in AUS who can fix a VESC?

Thanks.

11

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:frowning:

The DRV probably was fried when the voltage spiked as you braked hard.

2 Likes
12

Can you post a screen shot of the advanced tab?

I want to check your current ramp up

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13

12s with 190kv, eprm is getting close to limits of a vesc, what make is it?

14

Actually 67k erpm if I’m not mistaken

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Thanks for the help guys.

@Eboosted @banjaxxed

I realize I’m over the 60k ERPM but my logic was by setting the start limit and end limit in the soft ERPM I was avoiding high ERPM so it would not be an issue. This assumption may be wrong? Especially seeing as how the issue seemed to occur on a hard brake.

Advanced tab below and updated settings which gave me a good amount of power.

I got the VESC from esk8hubs. Their site seems to be gone so not sure what is happening there.

I have ordered a replacement chip and the electronics guys at work think it is fairly straight forward to replace. Worth a try. for sure.

Cheers.

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16

When this block is checked your skateboard will apply brakes to stop it from exceeding the ERPM limits. That’s not ideal because you’re probably traveling fast at this point.

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17

Get a FocBox, you will be on the endless repair loop.

The FocBox has a safety feature that cuts current avoiding it from frying when something goes wrong.

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18

I don’t think so. The FOCBOX simply has higher rated components that reduce the chance of damage. Same software and similar hardware to the original VESC 4.12.

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19

All my focboxes are still working, there’s only one with a burned c49.

1 Like