timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 Search function left me wanting, so here's a post!This morning i recieved my Horizontech Krixus tank which uses a Tungsten coil embedded in cermaic.Pulled the CSV from SteamEngine and got the mod loaded up.225degC @ 75w base, on a 0.37ohm coilFires fine, but after a few minutes it starts saying "ohms too high" and shows the ohms have reached into the 0.60 ish territoryFound a couple other vapers on FB experiencing similar issues.Using EScribe 1.042 with firmware 2016-02-23 on my VT133Edit: Tried and got the same result both with the resistance locked and unlockedThoughts/advice? Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 Ah, occurs out of temp mode too, straight power mode get the same result, OHMS climb to 0.60 ish, and then the mod reports "ohms too high" Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 If you look at the power graphs on the data sheet you see that temp sensing coils of 0.37 ohms should go up to just over 110 W, in power mode coils of 0.6 ohm should go up to about 145 W. I would expect the message if you going above these numbers. http://evolvapor.com/datasheet/dna200.pdf Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 Even though i'm only firing at 75w? Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 No, but you didn't say originally, sorry you did and I missed it. I have not used this atty so can give no specific advise, maybe see if the manufacture has a forum or contact their customer services if ther is no info on the www. Failing that I would vape it while attached to Device Monitor to see if you can capture what is happening when you get the warning, hit pause and post the screen shot. Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 I don't think its the coil/vendor to blame. The unit works fine on 2 different Joyetech TC devices with the tcr set to the same value in TC mode, and also works fine in power mode.It's something to do with how the DNA200 board reads/works with tungsten i think. Link to comment Share on other sites More sharing options...
blueridgedog Posted March 23, 2016 Report Share Posted March 23, 2016 What other TC devices are you using that hits it with 75w as a preheat...or do you have more entered? Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 I was not blaming the coil manufacture, just suggesting you ask them for the settings as they will have the most data on the coil. Without a device manager screen shot of it doing it I have nothing to go on. 75 W should be fine up to about 1.15 ohm and the only thing I could think of is it dropping out of temp mode because the temp doesn't raise by 150 F in the first second, but if the res is still less than an ohm as you say I don't see why you would get the warning then. Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 blueridgedog: Touché, none, however, my preheat profile is set to 75w, preheat of 0.5sec and a punch of "5" - Also setting my device to 0 preheat has the same resultBut it ALSO has this issue in power mode. That's what i consider the big issue further than the TC aspect.I'll grab a screenshot once i get in tonight as sadly my work take a dim view of me blowing clouds in the office. Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 Make sure you have live ohms, temp and power checked.BTW turning preheat down is more likely to cause dropping out of temp limiting if it is taking too long to get up to temp than turning it up is. Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 Blakey reckons it works great in temp mode on a DNA 200 see post 10 http://allaboute-cigarettes.proboards.com/thread/62255/krixus-re-wickable-tank-vaping I know him personally and he knows what's what so I have no doubt it can. Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 I can keep on firing without vaping through it, and it never reaches 235degC or uses 100wSeems to stay in TC though, just not reaching limits even if i don't actually breath it in!? Link to comment Share on other sites More sharing options...
Spirometry Posted March 23, 2016 Report Share Posted March 23, 2016 Check Cell #3 Link to comment Share on other sites More sharing options...
timbomfg Posted March 23, 2016 Author Report Share Posted March 23, 2016 Spirometry said:Check Cell #3Yea.....about that..... Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 I think it may be hitting a 6 V limit for 2 cell operation, I have not seen that specified, but it's 9 V for 3 cells so seems logical to me. Link to comment Share on other sites More sharing options...
dwcraig1 Posted March 23, 2016 Report Share Posted March 23, 2016 That comes out to 6.17 volts, looks like you nailed it VBEDIT: it appears that I plugged in some wrong numbers into the calculator...5.96v it is. Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 Cheers, it said 5.96 V in device monitor, but it don't help the guy unless he has a 3 cell DNA as well. Link to comment Share on other sites More sharing options...
VapingBad Posted March 23, 2016 Report Share Posted March 23, 2016 OP did say it was a VT133 as well, I only have 3 cell DNA200 so I must have just tuned that out and it just didn't occur to me until I saw the screen shot. Link to comment Share on other sites More sharing options...
yoseff Posted March 24, 2016 Report Share Posted March 24, 2016 I imagine that my be a limitation in voltage because of the 2 battery configuration, as i used tungsteen coils (Dolphin - Ceramic) on the VS200 without any problem. Link to comment Share on other sites More sharing options...
timbomfg Posted March 24, 2016 Author Report Share Posted March 24, 2016 Unless i'm misinformed, shouldn't it be doing its voltage/amperage calculations based off cold ohms though, and regulating using the hot-ohm calculation? 0.4ohm at 6v is still 90w and it never even reaches that.I can now confirm it plays ball fine on 3 different Joyetechs, the XCube2, the Sig150TC (in power only mode), and even my old ratty BT65 Link to comment Share on other sites More sharing options...
dwcraig1 Posted March 24, 2016 Report Share Posted March 24, 2016 I use this calculatorhttp://www.the12volt.com/ohm/ohmslawcalculators.aspIt going to be hot ohms Link to comment Share on other sites More sharing options...
VapingBad Posted March 24, 2016 Report Share Posted March 24, 2016 timbomfg said:Unless i'm misinformed, shouldn't it be doing its voltage/amperage calculations based off cold ohms though, and regulating using the hot-ohm calculation? 0.4ohm at 6v is still 90w and it never even reaches that.I can now confirm it plays ball fine on 3 different Joyetechs, the XCube2, the Sig150TC (in power only mode), and even my old ratty BT65This has not been confirmed, but I am 99% sure it it your issue: the DNA 200 is a step down converter designed to run from 3 Li cells is series and is limited to a max output voltage of 9 V. After multiple user requests in this forum Evolv released firmware that allowed it to operate from 2 series cells at reduced power (133 W). It is the input voltage that has changed and it does not step up voltage the max output voltage has also changed to 6 V for 2 series cell implementations. So you need a resistance between 0.0532 ohm and 0.27 ohm for 133 W (max power) in this mode. You want 75 W in 2 cell the max res = 0.48 ohm, in 3 cell = 1.08 ohmV squared over power Link to comment Share on other sites More sharing options...
timbomfg Posted March 24, 2016 Author Report Share Posted March 24, 2016 Ah...Kinda regretting getting shot of my VT200 now... Link to comment Share on other sites More sharing options...
VapingBad Posted March 26, 2016 Report Share Posted March 26, 2016 Kanthal limits from R = P/I.I = V.V/P Link to comment Share on other sites More sharing options...
HCigar Sandy Posted April 1, 2016 Report Share Posted April 1, 2016 Do you this use VT133? I can keep on firing without vaping through it, and it never reaches 235degC or uses 100wSeems to stay in TC though, just not reaching limits even if i don't actually breath it in!?[/QUOTE] Link to comment Share on other sites More sharing options...
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