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by coulomb
Sat Jun 15, 2019 6:07 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72942

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

I thought I’d take the $25 gamble. I didn’t try charging but went instead to ‘ready’ where my hopes were dashed with an audible pop from the rear of the car. Huh. So that's evidence that some of the problems happen after the fuse goes open circuit. But I'd like to be clear on the exact sequence of ...
by coulomb
Mon Jun 10, 2019 10:30 pm
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 12996

Re: not charging my iON, cell or CMU or BMU problems

The second theory - that the BMU programs the CAN bus numbers of the CMU's to standardised numbers for each location and saves it to non-volatile storage in the CMU seems to fit the evidence far better. Yes, except that the CAN bus IDs (there are several per CMU) can be and are calculated from the ...
by coulomb
Sat Jun 08, 2019 6:56 pm
Forum: Batteries and Battery Management
Topic: CMU board notes, eprom, cell numbering
Replies: 8
Views: 843

Re: CMU board notes, eprom, cell numbering

Thanks a heap, Kenny, please keep 'em coming.

I find it strange that the lower voltage regulator has a voltage divider going to pin 1, and the upper one doesn't. Worth a double check?
by coulomb
Fri Jun 07, 2019 9:09 pm
Forum: Modifications & Accessories
Topic: Replace Low Beam (H11) Head Light Bulbs
Replies: 13
Views: 1683

Re: Replace Low Beam (H11) Head Light Bulbs

is there a trick to it? There is usually a tongue that needs to be depressed, possibly with a small tool like a small flat-blade screwdriver. They're nearly always really fiddly, so some wiggling and force is required even when the elusive tongue is found. A second flat-blade screwdriver may also b...
by coulomb
Wed Jun 05, 2019 2:15 am
Forum: General Technical Discussions
Topic: MCU 20A 450VDC fuse investigation
Replies: 14
Views: 1279

Re: MCU 20A 450VDC fuse investigation

when mounted in spring clips, it naturally will experience less mechanical stress on the mounting points. I can almost imagine the metal fingers in the original fuse creating a "tuning fork" of sorts. Add impulses from normal car vibrations and jolts, and the fuse could be doing a merry d...
by coulomb
Mon May 27, 2019 10:53 pm
Forum: Batteries and Battery Management
Topic: Car Now Charging! (was Car Not Charging)
Replies: 9
Views: 911

Re: Car not charging

This datasheet seems to indicate that the 50 mA maximum is only for various tests, e.g. dielectric test and lifetime test. Since they mention X-ray and other high pulse power uses, I assume that they are fully capable of taking many amperes, perhaps hundreds, from short pulses, since that is presum...
by coulomb
Thu May 16, 2019 10:07 pm
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 12996

Re: not charging my iON, cell or CMU or BMU problems

I've been reading the CMU firmware. ... In fact, it seems to me that this happens automatically any time that there is a certain type of error (I can't be certain about what type of error, and it was some time ago I that I found this). Automatic numbering like this seems unlikely - by what mechanis...
by coulomb
Wed May 15, 2019 8:35 pm
Forum: General Technical Discussions
Topic: Chademo speed and max soc
Replies: 3
Views: 574

Re: Chademo speed and max soc

This is because the two cells with high resistance reach the maximum 4.1 volts within a minute of starting the charge even while all the other cells are still only at 4.075 volts. I suspect though if you replaced those 2 cells with brand new cells, then two or three others would limit the fast char...
by coulomb
Sat May 11, 2019 7:55 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72942

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

kiev wrote: If the MCU fuse had blown then you wouldn't have any DCDC converter activity.

But maybe that's the reason for the 12 V battery dying; not getting charged at all.
by coulomb
Wed May 08, 2019 11:43 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72942

Re: capacitor ratings

Would you reckon these would represent a beefier cap since the voltage rating is higher, or were you thinking that the capacitance value also needs to be increased? I say don't change the capacitance value unless you really know what you're doing. My feel is that they just need to be physically bul...

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