Updates on ACS-R
Marco Sirianni
October 18, 2007
TIPS - October 18 2007
Agenda
• ACS Status
• ACS-R
– Concept
– Schedule
– EVA activities
– Role of STScI
TIPS - October 18 2007
Status of ACS
o ACS Side 1 Failed on June 19, 2006
• The ARB identified a most probable candidate for the failure,
an Interpoint DC-DC Converter on LVPS 3 board in MEB1
• Precluded all WFC and HRC CCD imaging.
• Operations started on side-2 electronics on Jul 4 2006.
o ACS Side 2 failed on January 27, 2007
•
•
•
•
Short likely in the Hold Bus
Side-2 is completely inoperable
Side-2 is inaccessible to astronauts for repair
Side 2 is not part of repair mission
o ACS was configured for Side-1 SBC operations
only on February 15, 2007
TIPS - October 18 2007
ACS-R
• Immediately after the failure of Jan 2007 the HST project
assembled a team for the repair of ACS.
• At the end of February a specific option was select for
further study.
• On October 3 & 4 the ACS-R project passed the critical
design review.
TIPS - October 18 2007
ACS-R CDR
Name
Affiliation
Primary Disciplines
Dennis Dillman
NASA/NESC
Review Team Chair
Tom Akers
Consultant
EVA
John Grunsfeld
JSC Crew Office
STS-125 Crew
Richard Harms
HST SM4 SRB
Instrument Systems
Denny Holt
Consultant
Shuttle Mission Mgmt
Chris Iannello
KSC Engineering
Power Systems
Wes Ousley
GSFC AETD
Thermal Engineering
Joe Pellicciotti
GSFC AETD
Mechanical Systems
Pete Salerno
GSFC SRO
Electrical Systems
Steve Scott
GSFC Chief Engineer
Systems, C&DH, SW
QuickTime™ and a
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TIPS - October 18 2007
ACS-R Team
ACS Repair Mgr
Peter Alea
(ATK)
ACS Repair PI
Ed Cheng
(Conceptual Analytics)
Mission Assurance
Carl Powell
(HTSI)
System Safety
Willian Hill
(SRS)
Systems
Kevin Boyce (GSFC)
Becky Emerle (Ball)
Contamination
Radford Perry
(SGT)
Electrical Lead
Ike Orlowski
(J&T)
LVPS
Larry Trubell
(Ball)
Flight Software
Barbara Scott
(GSFC)
Parts Engineering
Noman Siddiqi
(GSFC)
Steve Arsianian (HTSI)
Randy Stevens (LMTO)
SI FSW
Bev Serrano
(Raytheon)
SIDECAR ASIC
Markus Loose
Raphael Ricar
FPGA
Ed Cheung
(J&T)
CEB-R Team
Thermal
Jeff Lasco
(Ball)
DCL
Augustyn Waczynski
(GST)
Yiting Wen
(MEI)
Mechanical
Operations/FSW
Clock Boards
Ken Albin
(Ball)
Mechanical Dev Mgr
Mark Turczyn
(GSFC)
Greg Waligroski (Ball)
Drew Brown (Ball)
I&T
Ed Shade
(LMTO)
CCD Emulator
Matt Owens
(MEI)
EGSE
Mark Belz
(J&T)
Structural Analysis
Mike Beda (Ball)
John Leahey (Ball)
GSE Software
Kathleen Mil
(J&T)
SIDECAR Asy Code
Raphael Ricando
Markus Loose
(Teledyne)
SIDECAR V&V
Rob Lampereur (Ball)
Chris Dorato (Ball)
Tools
Torchia Kelly
(ATK)
TIPS - October 18 2007
EVA
Ed Rezac
(LMTO)
STSci
Marco Sirianni
Alan Welty
Carriers
Minal Kashkari
(LMTO)
ACS Current state simplified
Electrical Block Diagram
PDU 20 Amp Fuse
PDU 20 Amp Fuse
WFC CEB
Side 1
Side 2
WFC CCD
HOLD Bus
APB
LVPS H
OPERATE Bus
HOLD Bus
HRC CEB
APB
HRC CCD
+15, -15, +35
+15, -15, +35
+5
LVPS O
+5
Failed Element
LVPS H
LVPS O
Suspect Element
MEB
Side 1 is fully operational except for the
LVPS power to the CEBs.
Currently running on Side 1.
TIPS - October 18 2007
OPERATE Bus
MEB
Side 2 is inoperable.
ACS-R concept
Restore WFC functionality under side-1 (LVPS failed on 6/2006) by
replacing the WFC CEB cards with a new module (CEB-R)
powered by a new LVPS (LVPS-R)
Restore HRC functionality by backpowering the existing HRC CEB
(the success depends on the status of the existing wire harness
within ACS)
Requirement: do not harm SBC
TIPS - October 18 2007
ACS-R simplified Electrical Block Diagram
New Power Supply
PDU 20 Amp Fuse
PDU 20 Amp Fuse
New
CEB
Side 1
Side 2
WFC CCD
HOLD Bus
APB
LVPS H
OPERATE Bus
HOLD Bus
HRC CEB
+15, -15, +35
+15, -15, +35
+5
+5
LVPS O
MEB
APB
HRC CCD
Failed Element
LVPS H
LVPS O
Suspect Element
OPERATE Bus
MEB
New Element
Side 1 used to operate the entire instrument
except for the CEBs which are
replaced/powered by a new box.
TIPS - October 18 2007
Side 2 is inoperable.
ACS-R Design Concept
PIE = Power Intercept Element
CEB-R = CCD Electronic Box - Repair
LVPS-R= Low Voltage Power Supply - Repair
POE = Power Output Element
LVPS-R
POE
CEB-R
PIE
TIPS - October 18 2007
Astronaut Handrail
CEB
Electrical
Interface
Conector
TIPS - October 18 2007
CEB-R
Replace the original 4 boards with a new
element which contains 4 replacement
boards
Backplane
Timing Board
Clock A/X Board
Motherboard Mating
Connectors
Clock B/Y Board
ASPC/Bias Board
TIPS - October 18 2007
LVPS-R
PIE Connector
Cover with
Tether Ring
POE
Tether
Ring
Cable
Stowing
LVPS-R
Grounding
Plug
Handrail Post
ACS Handrail
Post Attachment
Clamp
TIPS - October 18 2007
HRC Backpowering
• The ACS-R design provides the option of
backpowering the existing HRC CEB through the
existing harness within the instrument.
• One of the main issue is the supply of the +35V.
If it can be provided by the original LVPS than it
will be sincronized (-> lower noise), but it must
be provided by the LVPS-R HRC could be
noisier.
• Preliminary tests with flight spare HRC CEB and
CCD show no difference
TIPS - October 18 2007
ACS-R Testing
Besides the single component testing the full ACS-R system
will be tested with:
• Flight spare HRC CEB (backpowering testing)
• Flight spare build for HRC and WFC
– Cannot be cooled as on-orbit
– Used for testing with hi-I preamp and detector
– Functional testing when lowest noise is not needed
• WFC SITE spare CCDs (+custom cryostat)
– Can be cooled to -80 C, crosstalk testing
• CCD emulator
– allows readout of a complete 4Kx4K image
– adjustable noise level:
• Match on-orbit detector level to determine expected performance
• Set noise level very low to verify noise contribution of CEB-R
TIPS - October
18 2007
• Set noise level high to optimize
timing
pattern and CDS for best results.
Schedule Highlights
• Testing with the first engineering module of CEB-R and ACS flight
spare CCDs will start on Oct 25th.
• Flight LVPS ready Mid Jan
• Flight CEB-R ready early March
• Servicing Mission Ground Testing (SMGT) End of February (possibly
a second campaign with complete flight-hardware)
• TV testing - April
• Shipment to KSC - Jun 9
• Launch - August 8
TIPS - October 18 2007
Current Timeline
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TIPS - October 18 2007
EVA Tasks
•
All ACS Repair EVA tasks have been evaluated by suited SM4 crew
•ACS Prep
•Install Guide Studs
•Remove the EMI Grid
Install grid cutter, actuate, remove grid cutter w/grid
•Remove WFC Access Cover Plate and CEB Top Plate 00:45
Install FCP, release fasteners, remove FCP
•Remove 4 WFC CEB electronic boards
•Install WFC CEB Replacement Module
•Install Power Supply Module to ACS handrail, mate PIE
connector to LVPS-R and POE connector to CEB-R
•ACS worksite clean-up
00:05
00:20
00:10
01:00
00:10
00:10
00:20
Total (w/o door operations) 03:00
•The EVA timeline will continue to be refined through upcoming scheduled NBL
crew training and test runs as well as 1-G activities to address open issues on
tool stowage, tool design, fastener access, etc.
TIPS - October 18 2007
EVA Tools
Screen Grid Cutter
Card Extraction Tool
Fastener Capture Plate
TIPS - October 18 2007
The role of STScI
• Support ground calibration to identify areas where
science operations may need modification
(commanding, proposal preparation, data
processing)
• Support IPT in the definition of the ACS-R AT/FT
• Support the scientific evaluation of the FT
• SMOV planning and on-orbit re-commissioning
TIPS - October 18 2007
ACS-R in SMOV
• ACS-06 CCD Functional Test\
• ACS-08 WFC CCD Cross Talk
•
SMOV WFC and HRC observations will be kept in separate proposals/visits
to facilitate operations in case of unforeseen problems with the HRC
backpowering.
•
Cycle 17 calibration programs will overlap with SMOV and will provide
further characterization of the instrument.
•
We will include, as part of cycle 17 calibration plan, a “CCD optimization”
program to investigate the benefits of operating the CCDs with a reduced
clocking rate and clamp and sample scheme. The full impact on science
operation (read noise, CTE, dynamic range, readout time) will be evaluated
before making new options available for GO science.
•
This program will be executed promptly if the noise characteristics of the
default configuration are not satisfactory.
TIPS - October 18 2007
Conclusion
• ACS-R successfully passed CDR
• More integrated testing will start soon
• STScI will be more involved in the future starting with the
ground testing
-----Original Message----From: Weiss, Mike
Sent: Thursday, October 04, 2007 10:33 PM
To: Smith, Hsiao
Subject: Way to Go!
The ACS Repair just pulled off a miracle! You should all feel
extremely proud of what you just accomplished, and I'm sure that you do.
Please pass on to Ed, Pete and the entire team gratitude from not only
the HST Program Office but from anyone in our Agency who may feel that
NASA no longer has the "Right Stuff." ACS Repair has just proved them
wrong.
Superb effort on the part of all!
Mike
TIPS - October 18 2007