Journey to Mt Sharp - Part 3: Cooperstown to Kimberley - Waypoint 3, Sol 453 [Nov14,'13] to 595 [Apr9,'14] |
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Journey to Mt Sharp - Part 3: Cooperstown to Kimberley - Waypoint 3, Sol 453 [Nov14,'13] to 595 [Apr9,'14] |
 Nov 24 2013, 04:41 AM
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#31
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 Member  Group: Members Posts: 691 Joined: 21-December 07 From: Clatskanie, Oregon Member No.: 3988  |
Kind of sound's like the grounding issue that happened on Spirit.
QUOTE The drive conducted on Sol 2117 had been planned for one sol earlier, but was delayed after analysis of the Sol 2113 test led to discovery of a new electrical issue on Spirit. Engineers learned that a persistent voltage now exists between the rover electric ground and the rover chassis where no voltage should exist. This condition might be related to problems with the right-rear wheel. http://marsrover.nasa.gov/spotlight/20091217a.html Is it simular? And is the Rover wheel stall issue caused by the problem? |
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Nov 24 2013, 04:46 AM
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#32
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
QUOTE (djellison @ Nov 23 2013, 08:32 PM)  Read up on 'Floating Bus' Technically chassis ground is referenced to the actual surface (more or less, though if you were to drive a metal rod into the surface of Mars and measure the impedence to chassis ground I'm not sure what you'd get), so it's not really floating. It's more that the low side of the battery is intentionally not at the same voltage as chassis ground. Appendix A of https://standards.nasa.gov/documents/detail/3314876 shows the Cassini balanced bus, which is similar.
-------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Nov 24 2013, 07:11 AM
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#33
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Member Group: Members Posts: 238 Joined: 28-October 12 Member No.: 6732 |
QUOTE (djellison @ Nov 24 2013, 04:32 AM) Read up on 'Floating Bus'
 
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Nov 24 2013, 09:02 PM
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#34
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
QUOTE (James Sorenson @ Nov 23 2013, 09:41 PM) Is it similar? And is the Rover wheel stall issue caused by the problem? The Spirit description was less than crystalline to me, but I think the wheel problem was more a cause than a symptom of that bus imbalance (if that's what it really was.) In all honesty, though I'm probably supposed to understand this, I'm not certain what the advantages of a balanced bus are. I think it just gives increased visibility into current paths. I do know that the low side of the bus could be completely shorted to chassis and our instruments would work just fine -- in fact, that's how we usually operate them on the bench. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Nov 25 2013, 02:45 AM
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#35
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
A wee bird tells me that, though we see very few images, the arm was busy over the weekend and there will be more drives very soon. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Nov 25 2013, 10:08 AM
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#36
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Newbie Group: Members Posts: 11 Joined: 24-September 12 Member No.: 6669 |
There are a couple of Sol462 hazcam images down, looking hopeful!
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Nov 25 2013, 02:43 PM
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#37
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
Wow - look at those wheels!
http://www.midnightplanets.com/web/MSL/ima...000E1_DXXX.html (no, not because they are dinged up a bit - because they look great!) - and then look beyond them at the mountains. Even more wow - I don't know if they have ever looked so clear. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Nov 25 2013, 04:59 PM
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#38
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 Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (James Sorenson @ Nov 23 2013, 08:41 PM) Kind of sound's like the grounding issue that happened on Spirit. http://marsrover.nasa.gov/spotlight/20091217a.html Is it simular? And is the Rover wheel stall issue caused by the problem? No, the RF drive actuator for Spirit has nothing to do with floating bus or the steering actuator stall. The best explanation that came out was that the actuator stopped working due to a thin layer on the motor commutator that prevented current from flowing through the rotor's windings. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Nov 25 2013, 07:34 PM
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#39
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Senior Member Group: Members Posts: 2820 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
MAHLI panorama of the wheels on Sol 463.
Jan van Driel
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Nov 25 2013, 09:08 PM
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#40
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Newbie Group: Members Posts: 11 Joined: 24-September 12 Member No.: 6669 |
Latest news on the fault http://www.jpl.nasa.gov/news/news.php?release=2013-340
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Nov 26 2013, 12:17 PM
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#41
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 Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
My take on the mosaics taken on Sol 463. Separate parts, because the centers of the mosaics is not the same.
 
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Nov 26 2013, 03:18 PM
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#42
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Senior Member Group: Members Posts: 2820 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
The Mastcam L view on Sol 463.
Jan van Driel
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Nov 27 2013, 04:02 AM
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#43
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Sol 465 partial navcam pan:
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Nov 27 2013, 07:29 AM
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#44
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 Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Just concentrating on the crater rim.
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Nov 27 2013, 08:26 AM
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#45
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Yes
Very good visibility this sol My take on this panorama :  And Sol 463 Mastcam34 pano : 
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