XT 90 antispark

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999zip999   100 GW

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XT 90 antispark

Post by 999zip999 » Jan 08 2021 4:10pm

Just put in my battery with XT90 connections and they pop is this normal or is the antispark blown out ? Battery 20s6p Samsung 40t brand new battery.
Last edited by 999zip999 on Jan 31 2021 11:00am, edited 1 time in total.

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TommyCat   10 kW

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Re: XT 90 antispark

Post by TommyCat » Jan 08 2021 4:44pm

Thinking your referring to the XT 90 S type...
This video will give you information on how to test.


https://youtu.be/7PwdlPOl1zg




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T.C.
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999zip999   100 GW

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Re: XT 90 antispark

Post by 999zip999 » Jan 08 2021 7:35pm

Nice vid Tom . It pops when plugged in. Does that mean the resistor is gone bad ?

Jan-Erik-86   100 W

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Re: XT 90 antispark

Post by Jan-Erik-86 » Jan 09 2021 5:33am

How fast are you plugging it in? I'm not using anti spark connectors myself, but I'm guessing the resistor wont be able to charge the caps in the controller fast enough to prevent a spark if the caps are discharged completely and you plug it in very fast. It's also possible the resistor is simply burned up, but you would have to either test or measure this - or just swap the connector if you suspect it and have a spare.

hias9   100 W

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Re: XT 90 antispark

Post by hias9 » Jan 09 2021 7:21am

When I was using XT90S antispark connectors with a 22S lipo battery, the connector usually started to spark after about 10 or 20 connections.
Maybe always plugging it in only half and wait for a second before plugging it in completely helps, but I did not try that.
On my 14S battery the XT90S still works fine.

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TommyCat   10 kW

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Re: XT 90 antispark

Post by TommyCat » Jan 09 2021 10:35am

Good tips above about slowing your connection by letting the "pre-charge" system work. Especially with a larger voltage pack that would supply a controller having most likely larger capacitors... IE: larger sustained inrush current.


Image

Illustration above as seen in this informative thread...
https://electricbike.com/forum/forum/kn ... tors-xt-90

I've also seen a toasted resistor ooze a green looking discharge.


Image

As seen and talked about here... post #4039 and below.
https://electricbike.com/forum/forum/as ... post112474
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madin88   1 GW

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Re: XT 90 antispark

Post by madin88 » Jan 09 2021 10:52am

XT90s are made for RC model controllers which have lower voltage and way lower capacitance to precharge.

The resistor would have to be one with 50ohm or so that it doesn't blow when using it with 20s on big ebike controller.

999zip999   100 GW

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Re: XT 90 antispark

Post by 999zip999 » Jan 30 2021 2:15pm

So yes it was blown - green stuff coming out the top .
I replaced and with the tips found in the video of connecting male and female together when soldering really helped out . Good info
Why doesn't my xt60 pop or spark when I plug it into my charger at 84v kingpan 5a a great 10 yr old. Was at 59v and keep turning it up till it poop and repalce 75v cap for 100v volt and now 84v good for last two yrs.

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DogDipstick   10 kW

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Re: XT 90 antispark

Post by DogDipstick » Jan 30 2021 2:43pm

madin88 wrote:
Jan 09 2021 10:52am
XT90s are made for RC model controllers which have lower voltage and way lower capacitance to precharge.

The resistor would have to be one with 50ohm or so that it doesn't blow when using it with 20s on big ebike controller.
Completely agree. XT90S is way to low for us. Need 50-100ohm precharge.

Zip: I blew mine out along time ago.. then i installed a switched precharge (manual).
83.1v of Ironhorse XC.. :) :bolt: by Chevy :bolt: :D Broke 10 horsies :twisted: (... no.. down to 'bout 20% now... again....On another note... Anybody know how to diagnose broken ribs? ..Asking for a friend... ).. :? Waddyamean? You cant tell me how many amperes/Ft.^2 of the plate ?!?!? :x 1 (pound / second) Horse Power = 338.24 M^2 Kg^2 / Sec^4 ( :twisted: prove me wrong :twisted: ) :| (gottenymoem4115thangs?Yall?) :confused: Fabricator @ BSECo. Inc.

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Re: XT 90 antispark

Post by Tommm » Jan 30 2021 3:06pm

Xt90s will die after a few connections above 48v. But it is still good to have one for those few roadside moments.

You generally shouldn't pull apart wires to depower your ride anyway, just like you don't pull them apart for a Tesla or a Zero.

To depower your ride normally, use the key in/out mechanism on your controller, or when putting it in long term storage use the low power bms switch, or turn the bms off with its bms bluetooth app.

999zip999   100 GW

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Re: XT 90 antispark

Post by 999zip999 » Jan 31 2021 10:57am

Yes I was old school always disconnect your battery when not in use. You now 5 mm mains and a side precharge resistor first. I do have a 3usd off/on switch handle bar kill switch but want more off

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