Rebuild BM2 green...

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Re: Rebuild BM2 green...

Postby Burgerman » 01 Feb 2016, 17:33

If it fits... And can be dissasembled in the way I want.

Failing that it will be returned. VAT free too!

There are loads of cheap nasty heavy ones on ebay... But they are narrow, and either badly made or used. It seems to me that if you are building a new chair you should do it right. Wont arrive for 14 days as built to order. So we will see. Was tempted to get blue.
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Re: Rebuild BM2 green...

Postby Irving » 01 Feb 2016, 19:50

If built to order could you not have seen if they'd do the back on its own?
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Re: Rebuild BM2 green...

Postby hank » 01 Feb 2016, 20:58

Like the bucket seat idea. 8-)
Hope it works out for you John.
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Re: Rebuild BM2 green...

Postby Burgerman » 01 Feb 2016, 21:36

If built to order could you not have seen if they'd do the back on its own?


Couldnt get any sense out of them. They have a list of colours, back colours, suades, leathers, mixes, but if you go off the usual menu they all just look bewildered... And dont sell direct to public.
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Re: Rebuild BM2 green...

Postby ex-Gooserider » 02 Feb 2016, 05:31

Minor question - what should we call this chair :?: It isn't really a BM4, since its not a new design, but its not the same BM2 that you started with... Should we label it the BM2A :?:

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Re: Rebuild BM2 green...

Postby Burgerman » 02 Feb 2016, 09:43

BM2v2 or BM2-L for lithium...? Or BM2-R for rebuild, or BM2-P for pose... Since the seat, colour, wheels etc are all mostly to look pretty!

Probably BM2v2
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Re: Rebuild BM2 green...

Postby teabag » 02 Feb 2016, 09:48

B.M Z 120L ?
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Re: Rebuild BM2 green...

Postby Burgerman » 02 Feb 2016, 09:52

Too long...
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Re: Rebuild BM2 green...

Postby hank » 02 Feb 2016, 10:22

JBW :)
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Re: Rebuild BM2 green...

Postby Burgerman » 02 Feb 2016, 20:31

I am just checking out my Pilot Plus well used 100A unit.. All the contacts need cleaning up as they show signs oif burning. on the INSIDE and outside!

Take a look how the contacts connect battery and motos INSIDE. They just press togetheer with some foam strrips...

I am also adding a 45 degree thermostat switch. Because I am adding a fan to keep things cool. This will stop it rolling back and reducing power so soon. The best place for the tiny thermostat is inside bolted to the mosfets. But thats not easy... So will be next to them instead.

810_1259.JPG


810_1263.jpg


810_1265.JPG


810_1266.JPG
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Re: Rebuild BM2 green...

Postby Burgerman » 02 Feb 2016, 22:15

And now the thermostat is inside the case and the fan fitted behind the mounting plate under the seat cover.

810_1272.JPG


So the power module can sit over the hole on 2 8mm spacers so the air can escape underneath in all directions.

810_1278.JPG


And the fan will come on any tie the mosfets reach 45C.
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Re: Rebuild BM2 green...

Postby Burgerman » 02 Feb 2016, 22:43

And the top which will not be seen because there is a flat metal seat plate yet to be fitted:

810_1280.JPG
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Re: Rebuild BM2 green...

Postby expresso » 03 Feb 2016, 01:44

Nice i like that idea - i remember reading about soccer with the chairs and people adding fans to there chairs - but didnt look into that dont remember how they added fans to there chairs -
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Re: Rebuild BM2 green...

Postby Burgerman » 03 Feb 2016, 02:25

If you program your chair to go. To stop. To turn. When *you* tell it, and you dart about a bit for a few minutes stopping and turning they *all* start shutting down and rolling back the power. And eventually it gets to the point where the chair barely moves.

Mine only does it when I am clearing leaves with a blower for half an hour when darting around and zig zagging. Because I adjusted the temperature in the programming from 55 to 70 centigrade. So it doesn't usually bother me. But now and again in summer it cuts in and pisses me off...

This should help keep it cool. And with the thermostat chip inside the power module, epoxied to an output mosfets, it should be efficient. Its not easy either. Not any wasted space inside that PM! At 45C the fan is on. At 40C it goes off again. So it only wastes power and makes a noise if needed. It is only a small fan too, but its circulation is quite good because of the way its working and the way the PM is spaced off the surface. The cool airflow around it and from behind it is pretty good.
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Re: Rebuild BM2 green...

Postby Burgerman » 03 Feb 2016, 02:37

There will be a 3 position lighting switch on there too. OFF/AUTO/ON. So I can leave it on auto normally, and a light sensor will decide. And a movement sensor.

So on auto: if moving + dark light comes on. If it stops moving or gets light, they go off after say 2 or 5 mins.
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Re: Rebuild BM2 green...

Postby Burgerman » 03 Feb 2016, 02:46

I presume you haven't looked inside your power module yet then?

Image
Image :lol:

Nothing to be scared of. You just get to see how crappy the build quality is, wit only a rubber foam pad making the pressure for all the connections to the power mosfets. Amazing they don't fail more often. And that they are using just 8 power mosfets. Unlike the Roboteq with 32... No wonder they get hot really is it.
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Re: Rebuild BM2 green...

Postby shirley_hkg » 03 Feb 2016, 05:36

O M G !

WHAT a confidence they have.
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Re: Rebuild BM2 green...

Postby Burgerman » 03 Feb 2016, 11:17

Well surprisingly it does appear to work pretty well! I and the rest of us using all of PG Drives systems, inc Rnet should take the thing apart and use a scotch bright cloth or fine glass paper to clean those contact point every year or so though. It will likely prevent failure.
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Re: Rebuild BM2 green...

Postby expresso » 03 Feb 2016, 17:00

The contact points your talking about to clean - are the plugs where you plug in the cables ? or inside the box itself -
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Re: Rebuild BM2 green...

Postby Burgerman » 03 Feb 2016, 17:03

Look at the pictures. Inside. They just press together with a bit of foam! That is supposed to be OK for 100A per motor.

Outside too.
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