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DNA 250

Nick

By Nick
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Spector NS5 RD Senior Member

Spector NS5 RD

Posted
Posted
mfj said:

It's definitely not the power supply. I've tried several.

definiely contact evolv. this is the same behavior the VS dna 200's were displaying with the first SP1  update. they had to tweak the FW for a fix. open a ticket and see what they say then report back. to rule out anything on your end, make sure the usb cable you are using is capable of carrying the 2 amps the 250 is requiring for the charge. make sure the wall wart is 2.1 amps or above.

you can open a help ticket here........

https://helpdesk.evolvapor.com/index.php?a=add
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antyac2108 Member

antyac2108

Posted
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I asked about that when i first built my DNA250 and i was told by evolv this

Hi Anthony,

The behavior with temp control should be accurate, however we will look into it on our end.

The charging resetting and ramping back is a known firmware/software issue we are working to resolve at the moment.

Thanks,
Nick Coutris
Evolv, Inc

 
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mfj Member

mfj

Posted
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antyac2108 said:

I asked about that when i first built my DNA250 and i was told by evolv this

Hi Anthony,

The behavior with temp control should be accurate, however we will look into it on our end.

The charging resetting and ramping back is a known firmware/software issue we are working to resolve at the moment.

Thanks,
Nick Coutris
Evolv, Inc

 
Thank you! That is very helpful! Just waiting patiently for the fix lol
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retird Senior Member

retird

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antyac2108 said:

Lol no problem I'll post asap



LOL.... now I have my first cup of coffee...  LOL

Doing a quick search for amperage rating of usb cables..... looks like the lay person's answer is that "most USB cables should be able to handle 2.1 Amps".

Ran across this comment made about the subject (I have no idea if this statement is valid but here it is):

Data cables that allow the device to sync to the computer and transfer files also cause slow charging speed. if you get a cable that's wired just to charge, it will solve this problem. 
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Spector NS5 RD Senior Member

Spector NS5 RD

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retird said:



LOL.... now I have my first cup of coffee...  LOL

Doing a quick search for amperage rating of usb cables..... looks like the lay person's answer is that "most USB cables should be able to handle 2.1 Amps".

Ran across this comment made about the subject (I have no idea if this statement is valid but here it is):

Data cables that allow the device to sync to the computer and transfer files also cause slow charging speed. if you get a cable that's wired just to charge, it will solve this problem. 

here's what i use, STRICTLY for charging......

https://www.amazon.com/PortaPow-Specialised-Blackberry-Transformer-Charging/dp/B00RL68RNS/ref=pd_sim_107_1?ie=UTF8&psc=1&refRID=5ST2VMHAYCW9DJSG0E7V

i have four of the 3'.3" ones. they work very well and 2 are about 1 year old and the micro usb end portions of them are holding up nicely, still a nice snug fit.
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retird Senior Member

retird

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dwcraig1 said:

Here also, depending on shipping charges they may be a bit less than Amazon.
http://www.ebay.com/itm/PortaPow-Specialised-3-3ft-20AWG-Charge-Only-Micro-USB-Cable-2-Pack-New-/282068762006?hash=item41ac9bbd96:g:P~oAAOSwepJXYQK7



THX for that.... I love PayPal and free shipping...... off to ebay I go...... 2 for 15 bucks ain't bad.... :thumb:
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Synoptex Member

Synoptex

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Good day, gentleman. Could you please clarify to me what does the new feature "Onboard reverse voltage protection" means? Does that mean that if I place my 18650 batteries upside down my fuse will not blow like on DNA200? Like the other cheap "Chinese chips" do, they just do nothing untill I place the batteries in correct way... If that's so, that's a good news combined with 2A charging that will definitely make me switch to DNA 250 board.

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retird Senior Member

retird

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I've not seen a 250 (just pictures of it) nor seen much info on it yet..... not much discussion either yet.....

From the Data sheet:

Fuse Because of the energy and power stored in the battery, the DNA 250 includes an onboard 30 amp SMT fuse. The fuse is located on the underside of the PCB near the B+ battery terminal, and is labelled “Fuse” In normal operation the fuse should never blow. However, in the event of an error or short circuit on the board, the fuse will protect the battery. Should it need to be replaced, the fuse is manufactured by Bel Power Solutions, part number C1H30.

If you suspect your fuse is blown, check continuity across the fuse to verify using a Multimeter.

Replacement is accomplished by de-soldering the blown fuse from the board and soldering on a new fuse.

DNA 250 is designed for battery packs that are permanently installed into the device, or battery packs that install using an insulated, polarized connector rated for at least 30 amps. If the battery pack is installed with the polarity reversed, the fuse will blow to protect the battery pack, board and user.

If you are manufacturing a device that is designed to be used with three individual replaceable 18650 cells, the DNA250 now offers reverse polarity protection.

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Synoptex Member

Synoptex

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<span>retird</span> said:

If the battery pack is installed with the polarity reversed, the fuse will blow to protect the battery pack, board and user. 



Thank you.
But thats what I read from Data Sheet and I hope to presume this as a mistake copy/pasted from DNA 200 Data Sheet. 
Why there was Nick posting here in firs post about NEW features of DNA 250:


Nick said:

...with the addition of a few exciting features.

-Onboard reverse voltage protection



As I understand, he tried to point out the NEW features, that were not present in DNA 200 board.
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Spector NS5 RD Senior Member

Spector NS5 RD

Posted
Posted
Synoptex said:



Thank you.
But thats what I read from Data Sheet and I hope to presume this as a mistake copy/pasted from DNA 200 Data Sheet. 
Why there was Nick posting here in firs post about NEW features of DNA 250:




As I understand, he tried to point out the NEW features, that were not present in DNA 200 board.

if you look at the DNA 250 board (back side), you can see the fuse is the first component then followed by the reverse battery protection mosfet. sso if the polarity was reversed the mosfet wouldn't close the circuit which SHOULD protect the fuse from popping. that's how i see it.

edit......as for the balance tap connection, i'm not entirely sure what would happen if the polarity was reversed.

[image]
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VapingBad Senior Member

VapingBad

Posted
Posted

The single cells will not get 2 A, the 2 A is at USB voltage 5V and will be converted upward, if you think in Watts 2 A x 5 V = 10 W.  Then if the batteries are low, say 3.2 V, it charges then in series so 9.6 V, then ignoring efficiency loss and voltage sag on the USB supply 9.6 V / 10 W <= 0.96 A to the cells.   I have mostly charges 25R and VTC4s at 2 A and don't think it has shortened their life by much.

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BobC Member

BobC

Posted
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Just got the DNA250, and like all DNAs, first thing I do is put the screen on (no batteries), plug it into the USB, and test display and eScribe connection.

The board connects to eScribe fine, but no display.
I have a few DNA200s so I swapped the screens, and it works in the 200, but not the 250.

I can change the power up and down and it registers on the device monitor, so I think the board is fine

Is the DNA250 different then the 75, 200 and 60, requiring batteries to power the screen or do I have a defective board?

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