PPRuNe Forums - Search Results
PPRuNe Forums

Go Back  PPRuNe Forums > Search Forums
Reload this Page >

Search Results

Register
FAQ
Calendar
Wikiposts
Today's Posts
Search
Vendor Directory
Search: Posts Made By: mm43
Showing results 1 to 24 of 24
Search took 0.00 seconds.
Forum: Tech Log
3rd Apr 2013, 18:36
Replies: 1,100
Views: 263,332
Posted By mm43

@ Kenneth HouseLikewise, my search for any info...

@ Kenneth HouseLikewise, my search for any info on Zodiac Aerospace electrical data has also drawn a blank.

Thales, as the main contractor appears to have a large number of sub-contractors under...
Forum: Tech Log
1st Apr 2013, 20:33
Replies: 1,100
Views: 263,332
Posted By mm43

@Kenneth HousePerhaps we need to look more...

@Kenneth HousePerhaps we need to look more closely at how the contactor is being controlled via BMU/Charger interaction. I note your neat deduction of the contactor coil current, but suspect there is...
Forum: Tech Log
1st Apr 2013, 03:29
Replies: 1,100
Views: 263,332
Posted By mm43

@Kenneth House Your succinct description of...

@Kenneth House

Your succinct description of the correct method of charging Li-ion batteries is appreciated.

However, the apparent failure of the Charger/BMU to cease charging the battery at CV...
Forum: Tech Log
15th Mar 2013, 23:53
Replies: 1,100
Views: 263,332
Posted By mm43

Seems rather obvious that Boeing don't employ...

Seems rather obvious that Boeing don't employ expertise from NASA, and NASA don't employ from Boeing for the same reason.:}
Forum: Tech Log
8th Mar 2013, 18:54
Replies: 1,100
Views: 263,332
Posted By mm43

If that is the actual design criteria, some heads...

If that is the actual design criteria, some heads need more than banging.

The APU once online should be self sufficient, and not beholden to the state of APU battery.
Forum: Tech Log
7th Mar 2013, 18:09
Replies: 1,100
Views: 263,332
Posted By mm43

NTSB - Boeing 787 - Interim Report - March 7,...

NTSB - Boeing 787 - Interim Report - March 7, 2013 (http://www.ntsb.gov/investigations/2013/boeing_787/interim_report_B787_3-7-13.pdf)

Detailed Analysis.
Forum: Tech Log
21st Feb 2013, 23:01
Replies: 1,100
Views: 263,332
Posted By mm43

Kind of looks as if there is some unforeseen...

Kind of looks as if there is some unforeseen commonality via the DC buss and the Main and APU battery packs. The on ground services supplied by each battery may well be the link.
Forum: Tech Log
20th Feb 2013, 19:16
Replies: 1,100
Views: 263,332
Posted By mm43

My interpretation of a Google translation:- ...

My interpretation of a Google translation:-

Slide 15 of the current JTSB report indicates that regardless of switches/CBs in the Nav light circuits being isolated, the Nav lights were on and...
Forum: Tech Log
12th Feb 2013, 04:40
Replies: 1,100
Views: 263,332
Posted By mm43

@ Lyman, The BC-1300 series are for both Ni-Cad...

@ Lyman,
The BC-1300 series are for both Ni-Cad and Securaplane Lithium-Ion batteries.

The Battery charger BMS 50 pin connector J1 is connected to its complementary J1 connector on the Battery...
Forum: Tech Log
12th Feb 2013, 00:04
Replies: 1,100
Views: 263,332
Posted By mm43

Lyman - #641, To the contrary, the charger and...

Lyman - #641,
To the contrary, the charger and the battery case are connected by a multiple pin cable, and the PCB's located in the battery compartment are probably concerned with buffering...
Forum: Tech Log
11th Feb 2013, 18:58
Replies: 1,100
Views: 263,332
Posted By mm43

Lyman, The Securaplane battery charger carries...

Lyman,
The Securaplane battery charger carries its own diagnostic tool and records appropriate data. I suspect chargers will be located nearby each of the suspect battery packs, and according to the...
Forum: Tech Log
11th Feb 2013, 17:27
Replies: 1,100
Views: 263,332
Posted By mm43

@Lyman, Securaplane...

@Lyman,
Securaplane (http://www.securaplane.com/download/doc_download/36-lithium-battery-charger-unit),
Mx got the info from somewhere, and knew when to change the units out.
Forum: Tech Log
9th Feb 2013, 23:02
Replies: 1,100
Views: 263,332
Posted By mm43

@RR_NDB You can't have one without the other. ...

@RR_NDB
You can't have one without the other.

If you are meaning a spontaneous cell short, the result is still heat, and the BMS should detect a rapid change in either temperature or cell...
Forum: Tech Log
9th Feb 2013, 21:07
Replies: 1,100
Views: 263,332
Posted By mm43

@saptzae Well, the discussion is about just...

@saptzae
Well, the discussion is about just that!
Forum: Tech Log
9th Feb 2013, 20:13
Replies: 1,100
Views: 263,332
Posted By mm43

Battery Management System

I note there has been extensive discussion surrounding the apparent lack of temperature sensing for each of the 8 series cells in these battery packs.

I mentioned many posts ago the need in the...
Forum: Tech Log
3rd Feb 2013, 21:47
Replies: 1,100
Views: 263,332
Posted By mm43

@ hetfield; Texas Instruments ... ...

@ hetfield;

Texas Instruments ...
Overall, each group of parallel cells forms one of 8 series cells, and the only monitoring that is done is that of each parallel group as its contribution to...
Forum: Tech Log
3rd Feb 2013, 20:34
Replies: 1,100
Views: 263,332
Posted By mm43

The CT scans show nothing to indicate monitoring...

The CT scans show nothing to indicate monitoring of the sub cells, so in that respect it would appear that your assumption is correct.
Forum: Tech Log
3rd Feb 2013, 19:57
Replies: 1,100
Views: 263,332
Posted By mm43

A very good question. All the talk has been...

A very good question.

All the talk has been around balancing each of the 8 cells within the battery, but we seem to have within each of those 8 cells another 6 sub cells, but they are in parallel...
Forum: Tech Log
3rd Feb 2013, 19:24
Replies: 1,100
Views: 263,332
Posted By mm43

A cropped image from one recently published by...

A cropped image from one recently published by NTSB, showing internal arrangement within a cell.

http://i47.tinypic.com/29fxnip.jpg
Forum: Tech Log
2nd Feb 2013, 18:21
Replies: 1,100
Views: 263,332
Posted By mm43

@ TURIN, saptzae; Thanks for your responses...

@ TURIN, saptzae;

Thanks for your responses to my query at #363 (http://www.pprune.org/tech-log/505695-787-batteries-chargers-19.html#post7668532).

The blocking "diode" will most likely consist...
Forum: Tech Log
1st Feb 2013, 05:46
Replies: 1,100
Views: 263,332
Posted By mm43

Question?

What comes first? The Batt~DC Buss blocking diode then the Batt CB, or is the sequence reversed?

Am I right to assume that both the above are outside the battery pack?
Forum: Tech Log
30th Jan 2013, 19:00
Replies: 1,100
Views: 263,332
Posted By mm43

@rottenray You're on the right track.:ok: ...

@rottenray

You're on the right track.:ok:
My point all along. Logging is separate issue, and that I agree can be done in a separate E/E rack, with each battery pack logged in with its own IP type...
Forum: Tech Log
27th Jan 2013, 19:36
Replies: 1,100
Views: 263,332
Posted By mm43

I suspect the reason for the present arrangement...

I suspect the reason for the present arrangement is to keep the battery management system intrinsic with the cells that it controls. Additional and unquantifiable ohmic losses could present a...
Forum: Tech Log
24th Jan 2013, 03:58
Replies: 1,100
Views: 263,332
Posted By mm43

Now I understand how you guys are sooooo... tall....

Now I understand how you guys are sooooo... tall.

Make Google your friend ....

"15 feet = meters" will get you down to size.:ok:
Showing results 1 to 24 of 24


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.