BMS setup

[StrapYourSelfIn]

I know you will scream for more info but this is why I am here

I bought a 36v 10ah headway pack and it came with a bms

http://shop.i-tecc.de/bms-pcb-pcm/bms-12s-36v/bms-lifepo-12s-25a-36v.html

the documentation for the BMS sucked so badly. It made reference to B+ and P- connection points and the thing had only B- and P-

Does anyone have a run down on how to set this up. Even the logic of a bms would help

 

[dnmun]

B+ is the positive terminal of the battery. B- is the negative terminal of the battery. P- is the negative connection to the controller. how hard can it be?

 

[999zip999]

I start with the last sense wire. The neg. one to the last cell on the neg. end then the next wire pos. to the top of same cell then to the next cell in series to pos. Top on far end checking with volt meter.
I hang sense wires like a parachute to make it ez.

 

[StrapYourSelfIn]

B+ is the positive terminal of the battery. B- is the negative terminal of the battery. P- is the negative connection to the controller. how hard can it be?

"It made reference to B+ and P- connection points and the thing had only B- and P-"

Actually reading a post and not being patronising in a reply,how hard can that be?

 

[dogman dan]

Some here on ES live in a world I can only dream of understanding.

Good that you sent a picture of the bms. But I can't really tell much from it. I see the sense wires connections on the right, the little row of pins.

Looks like some bigger connections on the left, labled T1 and T2. I can't see what the two white wires connect to, Both to T2?

I hope somebody can tell you what points on that bms are the B and P connections. B is from battery to bms, P is bms to controller.

 

[dogman dan]

Looking some more, I do see a large B- on the lower board. lower left corner. That is the negative connection of the first cell on the negative end of the string of series connected cells.

That cells + terminal is also the - of cell 2, that's the first little pin on the row of pins. The rest follow.

I'm not certain what happens with the big positive wire. but it looks like there may be a B+ on the upper right corner, lower deck.

Two large terminals on the lower deck, center left side look like they may be P terminals.

The white wire goes to an on off switch?

 

[dogman dan]

Red wire just bypasses it? So no need for a b or p +?

 

[StrapYourSelfIn]

Red wire just bypasses it? So no need for a b or p +?

Thanks for taking the time.

The reason it was confusing as it had B- and P- on the lower board and that was it. Reading through your posts here it makes sense now.

The documentation that came with it was at such a level that if you understood it you wouldnt need to read it.

Thanks again

Lets hope I dont blow something up now

 

[StrapYourSelfIn]

@ dogman

I had one of the electric engineers at work check it out and being an uber nerd, didnt look at the instruction. Just asked me a few questions then mapped the entire BMS with a multimeter into CAD checking the specs of all the components from the manufacturers spec sheet.

Its good having people like this accessible .

Anyway apparently the positive goes directly to the battery/changer .
The negative P- and the unmarked connection below it are connected so one would be for Charging and the other to the motor -
From the B- a connection is made to the last - battery point.

Luckily he is really interested in this and said to come to his lab to build and test it.

He also looked at my specs motor,contoller etc and offered to mod the BMS to increase the cutoff for discharge.