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by coulomb
Sun Jan 10, 2021 6:44 am
Forum: Batteries and Battery Management
Topic: Firmware for charger, BMU, CMUs
Replies: 17
Views: 10788

Re: Firmware for charger, BMU, CMUs

It seems that it may be possible to read the firmware of a BMU, using Russian software that costs US$60 and a little hardware. I'm very hazy on the details, but it seems that we need to find the BOOT signal. It's not marked on any schematic that I'm aware of. My suspicion is that it will connect to ...
by coulomb
Sat Jan 09, 2021 5:56 pm
Forum: Batteries and Battery Management
Topic: Battery pack replacement, complete 50N pack?
Replies: 3
Views: 270

Re: Battery pack replacement, complete 50N pack?

I guess i need some reprogramming of CMU-boards etc? The CMUs are bolted to the top of the cells inside the battery pack. So as long as you swap the whole pack over, that part of things should be fine. The main question in my mind is whether the newer pack with newer CMUs will still talk the exact ...
by coulomb
Wed Jan 06, 2021 6:36 pm
Forum: Batteries and Battery Management
Topic: Test of elements for replacing LEV-50
Replies: 8
Views: 511

Re: Test of elements for replacing LEV-50

What chemistry do the replacement cells use? The LEV50 is old chemistry, I believe it's LMO (Lithium Manganese Oxide). It's hard to get those cells any more. Most modern cells are NMC (Lithium Nickel Manganese Cobalt Oxide). The curves are different enough that the iMiEV's BMS will think that new ce...
by coulomb
Wed Jan 06, 2021 6:19 pm
Forum: Batteries and Battery Management
Topic: 2010 obc fail.....yep another
Replies: 15
Views: 845

Re: 2010 obc fail.....yep another

i was under the assumption my issue was at the relay, as when its energised, it has no reaction. Don't forget you need to get the polarity correct, else the diode there will short the power supply. Or if the power supply is strong enough (won't take much), it will destroy the diode. Having the diod...
by coulomb
Sat Jan 02, 2021 8:55 pm
Forum: Batteries and Battery Management
Topic: 2010 obc fail.....yep another
Replies: 15
Views: 845

Re: 2010 obc fail.....yep another

686579 wrote: all known fuses checked.(including the small onboard one)

I assume that includes the one in the inverter box, under an inspection cover.
by coulomb
Thu Dec 24, 2020 5:59 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 24
Views: 9753

Re: Crystal Marking

It appears to be a murata part, 10Mhz, based upon the marking code Brilliant, thanks! [ Edit: I wasn't expecting a "resonator"; I don't really know the difference. I remember Murata made 455 kHz ceramic resonators (for radio IF filters) in the 1970s. ] So that's confirmed then: the auto-r...
by coulomb
Wed Dec 23, 2020 9:38 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 24
Views: 9753

Re: CMU board notes, eprom, cell numbering

Anyone know what the crystal frequency is? The processor manual (if I have the right one) says it will work with 4.0 - 20.0 MHz crystals. I don't know how to look this one up: https://i.imgur.com/O8l7r1G.jpg It's almost like y.0X, with the leading "y" in a cursive font. [ Edit: either dot ...
by coulomb
Wed Dec 23, 2020 6:15 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 24
Views: 9753

Re: CMU board notes, eprom, cell numbering

Finding the secret sauce to easily renumber CMU's using a readily available third party diagnostic tool such as Hobdrive / icarsoft etc (no soldering/eeprom swapping) would be a breakthrough for the DIY and aftermarket repair and servicing of these battery packs. I'm making slow progress on reading...
by coulomb
Sun Dec 20, 2020 5:18 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 24
Views: 9753

Re: CMU board notes, eprom, cell numbering

On my 8-cell CMU board marked "G8D-795M-8 PWB(A) ver0.0.2", pin 6 is tied to the same ground as pin 5. The board is green in color, as i understand there are some red boards out there. HTH Yes, that's exactly what I wanted, thanks. The board I have here is also green, marked exactly the s...
by coulomb
Sat Dec 19, 2020 8:27 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 24
Views: 9753

Re: CMU board notes, eprom, cell numbering

I have a sudden interest in the eeprom contents, because I found the CMU firmware code that talks to it. It's associated (sorry, all I know right now) with CAN ids 6Fn (n=1-C for CMU id 1-12) and 6F0. My problem at present is that the code reads the contents 16 bits at a time, but the ORG (organisat...

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