Author Topic: Main Bus Switching Units (MBSU)  (Read 2309 times)

Online Olaf

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Main Bus Switching Units (MBSU)
« on: 11/11/2017 07:18 PM »
I have tried to create a timetable of the movements of MBSU´s on the ISS, but there must be at least one mistake.
The main problem is, that on FRAM-4 ESP-2 only one unit can be installed , but another FRAM is or was not empty.
Maybe someone can help to resolve the problems?

That´s my table
11.04.2002   installation of S0 Truss with four MBSU´s
03.08.2005   installation of ESP-2 with one spare MBSU on FRAM-4
30.10.2007   installation of one spare MBSU, delivered on STS-120, on ESP-2 FRAM-6
25.08.2013   installation of one spare MBSU, delivered on HTV-4, on ESP-2 FRAM-4 

30.08.2012    changing the MBSU, delivered on ESP-2 with one MBSU failed on S0
28.01.2013    relocation of the failed MBSU to ELC-2
08.02.2016   deinstallation/reinstallation of the MBSU on ELC-2 for test purposes
04./05.05.2017   changing the MBSU, delivered on HTV-4 with one MBSU failed on S0
08.08.2017   relocation of the failed MBSU from ESP-2 to JEM
20.10.2017   deinstallation of the MLI from one MBSU on ESP-2
04.11.2017   relocation of the repaired MBSU from JEM to ESP-2
« Last Edit: 01/28/2018 07:02 PM by Olaf »

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #1 on: 11/29/2017 07:21 PM »
On page 4 of https://www.nasa.gov/sites/default/files/atoms/files/nov_2017_nac_iss_status_and_transition_final.pdf
is shown that it is planned in January 2018 to moved one MBSU inside the ISS and later again outside.
I think that this will be the unserviceable MBSU, which is at the moment installed on ELC-2 FRAM 3.

Offline russianhalo117

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Re: Main Bus Switching Units (MBSU)
« Reply #2 on: 11/29/2017 08:01 PM »
On page 4 of https://www.nasa.gov/sites/default/files/atoms/files/nov_2017_nac_iss_status_and_transition_final.pdf
is shown that it is planned in January 2018 to moved one MBSU inside the ISS and later again outside.
I think that this will be the unserviceable MBSU, which is at the moment installed on ELC-2 FRAM 3.
correct.

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #3 on: 01/24/2018 02:20 PM »
https://blogs.nasa.gov/stationreport/2018/01/
Quote
Three-Day Look Ahead:
Thursday, 01/25: ... JOTI/MBSU install

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #4 on: 01/26/2018 01:50 PM »
https://blogs.nasa.gov/stationreport/
Quote
In preparation for the upcoming Main Bus Switching Unit (MBSU) maintenance, today the crew extended the A/L slide table into the JEM pressurized module (JPM), removed the passive capture mechanism, and installed JEM ORU Transfer Interface (JOTI) on the slide table.  Next week, robotics ground controllers will remove an MBSU from its location outside the station and place it on the JEM A/L slide table for transfer inside.  Once inside, station crew will perform maintenance on the MBSU to recover its functionality and then pass it through the JEM A/L again for reinstallation outside the station.

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #5 on: 01/29/2018 07:26 AM »
It  seems, that the transfer inside is planned on February,4.
http://iss.jaxa.jp/kiboexp/plan/180124.html?utm_source=dlvr.it&utm_medium=twitter

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #6 on: 01/30/2018 02:25 PM »
It  seems, that the transfer inside is planned on February,4.
http://iss.jaxa.jp/kiboexp/plan/180124.html?utm_source=dlvr.it&utm_medium=twitter
It is possible, that this will be delayed due to the problems with the LEE:

Online Olaf

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Re: Main Bus Switching Units (MBSU)
« Reply #7 on: 03/16/2018 02:32 PM »
It looks like the MBSU maintenance is delayed again.
https://blogs.nasa.gov/stationreport/2018/03/
Quote
JEM Airlock (JEMAL): Today the crew reconfigured the JEM ORU Transfer Interface (JOTI) in support of upcoming Materials ISS Experiment – Flight Facility (MISSE-FF) payload operations.  MISSE-FF will be a permanent external platform on the ISS that is modular and robotically serviceable. Remotely controllable sample carriers will provide sample protection and on-demand picture data previously unavailable on prior experiments.  Sample plates containing a variety of surface materials will be exposed to the space environment outside the ISS for varying durations to inform satellite designers on how different materials degrade over time.  MISSE-FF is currently manifested on SpaceX-14.

Quote
Today’s Planned Activities
Structures and Mechanisms JEM ORU Xfer I/F (JOTI) Reconfiguration from MBSU to MTT

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