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-   -   LVC/LVA for a 1 Cell LiPo? (https://www.rc-monster.com/forum/showthread.php?t=26962)

rawfuls 05.16.2010 10:46 PM

Oh thank god, finally.
Confusing as hell... Not for you, but definitely for me..
Thanks guys, I'll see if all else goes well, and if not..will still post back.. with pictures!

simplechamp 05.16.2010 11:02 PM

Quote:

Originally Posted by zeropointbug (Post 364818)
That labeling is horrible. Which diagrams are each person talking about? One is flipped around the other way.

The manufacturers diagram don't line up with the labels IMO. The big one is batt +, the one next to it is load +, and the far one is common ground... that's just the way I am reading it.

Even if it seems unconventional it makes sense to me that the larger size pad was made larger because it has to have 2 wires soldered on (B+ and P+), and that would leave the other two smaller pads to be single connections of B- and P- respecitvely.

zeropointbug 05.16.2010 11:56 PM

Well, despite the diagram on the site showing one thing, I really disagree with you. Look at the labels, you are plugging the JST into two positives, does that make sense? Am I missing something?

I would agree that the large contact looks like it would be for TWO connections, but not according to the babels.

rawfuls 05.17.2010 12:02 AM

I believe my first couple diagrams, I screwed up completely, but the newer one, on Post #29:
http://www.rc-monster.com/forum/show...9&postcount=29

Make sense to me..
considering it's positive on one side, and has two common grounds?

rawfuls 05.17.2010 12:04 AM

Just to be safe, sent in an email to verify my diagram, we'll see what they say

zeropointbug 05.17.2010 12:08 AM

You don't have two common grounds, the whole sense of the term is "common", is exactly that, it is common to both source and load.

The only explanation is that the labeling is wrong, or the diagram they show with the product is wrong.

Do we need Brian in here for an opinion?

Chadworkz 05.17.2010 12:16 AM

Here...

http://pics.offroadextremes.com/rc/wired_up.png

It's wired up so that the charger charges the battery without the charge current entering the device, and so that the device is powered by the battery current, not the charge current. All this time it is monitoring the charge and discharge cut-off voltages.

rawfuls 05.17.2010 12:16 AM

Quote:

Originally Posted by zeropointbug (Post 364848)
You don't have two common grounds, the whole sense of the term is "common", is exactly that, it is common to both source and load.

The only explanation is that the labeling is wrong, or the diagram they show with the product is wrong.

Do we need Brian in here for an opinion?

That's what I was thinking when I typed it
:lol:

Oh BrianG!

BrianG 05.17.2010 12:17 AM

Quote:

Originally Posted by zeropointbug (Post 364848)
...Do we need Brian in here for an opinion?

lol, I saw the opening post and thought the device Neil posted was pretty straightforward.

In looking at the pic below, it should be pretty obvious that the battery + and load + are common.

http://lib.store.yahoo.net/lib/thesh....7vpcb8.5A.jpg

Chadworkz 05.17.2010 12:18 AM

Here...

http://pics.offroadextremes.com/rc/wired_up.png

It's wired up so that the charger charges the battery without the charge current entering the device, and so that the device is powered by the battery current, not the charge current. All this time it is monitoring the charge and discharge cut-off voltages.

BrianG 05.17.2010 12:23 AM

Chad, I'm not seeing like that at all. I see it as the lipo + and charger/load + are connected to the large pad on the right. The lipo - is connected to the pad on the left. And the charger/load is connected to the middle pad. Essentially, the LVC just disconnects the - lead if an error occurs.

rawfuls 05.17.2010 12:27 AM

Quote:

Originally Posted by BrianG (Post 364852)
lol, I saw the opening post and thought the device Neil posted was pretty straightforward.

In looking at the pic below, it should be pretty obvious that the battery + and load + are common.

http://lib.store.yahoo.net/lib/thesh....7vpcb8.5A.jpg

Which would mean there are two grounds?


@Chadworkz: I thought the module would be supposed to be separate from th charger device, as in only the lipo, module, and a connector (for charging AND connecting to the device, but not at the same time)

BrianG 05.17.2010 12:39 AM

1 Attachment(s)
Two grounds? I think we are all making this a WHOLE lot more complex than it is. See the pic below.


http://rc-monster.com/forum/attachme...5&d=1274071038

They probably made it like this so that the "charger" also powers the circuit when it is plugged in, kinda like a laptop or whatever.

Chadworkz 05.17.2010 01:13 AM

Quote:

Originally Posted by BrianG (Post 364856)
Chad, I'm not seeing like that at all. I see it as the lipo + and charger/load + are connected to the large pad on the right. The lipo - is connected to the pad on the left. And the charger/load is connected to the middle pad. Essentially, the LVC just disconnects the - lead if an error occurs.

If the LiPo and Device positives are connected to the same pad, the LiPo will directly power the Device without passing through the Protection circuitry.

Chadworkz 05.17.2010 01:15 AM

Actually, we need to wait until we see the actual instructions for this.


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