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by coulomb
Sun Dec 09, 2018 3:28 pm
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 34
Views: 12358

Re: Battery Capacity Testing

The black dots in the graph above are battery capacities for 44 German owned iMiev/CZero/iOns collected by datom. Let's remember that this is the capacity as reported by the on-board BMS. The fact that range can miraculously be restored (real-world, achieved range) after the "battery smoothing...
by coulomb
Sun Dec 09, 2018 5:19 am
Forum: Batteries and Battery Management
Topic: Firmware for charger, BMU, CMUs
Replies: 6
Views: 447

Re: Firmware for charger, BMU, CMUs

It looks like it has some of the characteristics of the SH7705 group. I get more than half of the I/O on-chip registers from that manual.
by coulomb
Sat Dec 08, 2018 4:04 pm
Forum: Batteries and Battery Management
Topic: Firmware for charger, BMU, CMUs
Replies: 6
Views: 447

Re: Firmware for charger, BMU, CMUs

Is there anyone who owns a MUT-III VCI (Lite or not), who is prepared to open up their unit? It would really help me to know the exact processor that they use. In other words, please tell me all the numbers and letters printed on the big chip on the CPU board. Renesas make of the order of a hundred ...
by coulomb
Sat Dec 08, 2018 3:17 am
Forum: Batteries and Battery Management
Topic: Firmware for charger, BMU, CMUs
Replies: 6
Views: 447

Re: Firmware for charger, BMU, CMUs

I'll write a small program to extract the binary data next, and attempt to disassemble it. Source code for a very simple console mode C program is here . Compile with GCC for Cygwin or similar. So I've gotten an RPG image to disassemble, and it's not what I had hoped for. This seems to be the firmw...
by coulomb
Fri Dec 07, 2018 8:52 am
Forum: Batteries and Battery Management
Topic: Firmware for charger, BMU, CMUs
Replies: 6
Views: 447

Re: Firmware for charger, BMU, CMUs

I need to upload again; please pardon the stream of consciousness. I was browsing the 2018 MUT-III DVD I found in a torrent. The main executable seems to be MUT3_SE.exe (MultiUseTester three Second Edition). Someone pointed me to the second edition for iMievs; thanks. It and its dozen or so DLLs (Dy...
by coulomb
Thu Dec 06, 2018 5:01 am
Forum: General Technical Discussions
Topic: Imiev repair - precharge resistor
Replies: 8
Views: 517

Re: Imiev repair - precharge resistor

Here's an example of an ARCOL resistor made in the UK with similar specs as the JRM, just need to find it in 24R. Looks good. Except that the only "standard" value for the 75/150 W model seems to be 3 Ω. So that's the only value that Mouser and Digi-key stock. It looks like they'll make a...
by coulomb
Mon Dec 03, 2018 8:32 pm
Forum: General Technical Discussions
Topic: Imiev repair - precharge resistor
Replies: 8
Views: 517

Re: Curiousity killed the cat...

It looks like the initial current kick is about 14 Amps in ~2 msec, Yes; this is straight Ohm's law, with the capacitors initially a short circuit. 340 V / 24 Ω = 14 A. then current tapers back down to zero as the 800uF cap fills in about 120 msec, which is 6*RC time constants with R = 24 Ohms. Eve...
by coulomb
Mon Dec 03, 2018 7:00 am
Forum: General Technical Discussions
Topic: Imiev repair - precharge resistor
Replies: 8
Views: 517

Re: Imiev repair - precharge resistor

Don wrote:Ohmite makes a 25 ohm, 40 watt, 5% wire wound resistor.

Yes, but can it handle the spectacular peak power? It doesn't seem physically large enough. It will be tough to "fill those shoes".
by coulomb
Wed Oct 24, 2018 6:47 pm
Forum: General Technical Discussions
Topic: my Miev will not charge
Replies: 147
Views: 23402

Re: my Miev will not charge

kiev wrote: A worn out aux can prevent READY.

If it's been sitting idle in the workshop for months, even a new auxiliary battery could die, or at least require a good long charge.

That would be worth checking for sure.
by coulomb
Wed Oct 24, 2018 5:28 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 329
Views: 20977

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Coulomb has suggested using a natural cure silicone sealant "silastic". That's neutral cure, as in neutral pH. The kind that cures with acetic acid is of course acidic, which in addition to the corrosion etc is conductive , at least while curing (which could take days to complete if it's ...

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