Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/smov/webfiles/SCREPS.pdf Дата изменения: Thu Oct 10 23:00:32 2002 Дата индексирования: Thu Feb 27 23:53:05 2014 Кодировка: Поисковые слова: arp 220

HST MOSES

Electrical Power Subsystem

Natalie Seftas September 30, 2002

INSTRUMENT OR SUBSYSTEM:

SA3 Drive Mechanism Performance

REQUIREMENT: J10.4.14.1.1 "Verify that SA3 Drive Mechanism is performin g nominally and that the sensed positions are within +/- 3.5 degrees of the commanded position when operating within the range of 0 to 130 degrees and +/- 5.0 degrees if operating outside this range. The maximum command profile error during the solar array slews will also be verified to be less than the safemode test th reshold of 10 degrees for 3 seconds." RELEVANT SMOV PROPOSAL : NONE DESCRIPTION OF METHODS: Performed data extractions following SA3 installation to determine if sensed positions were within the expected range of the commanded positions . DESCRIPTION OF RESULTS : All slews performed within their expected ranges. Results summarized on following chart. REQUIREMENT STATUS: SUPPORTING DOCUMENTATION : SATISFIED NONE

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HST MOSES

Electrical Power Subsystem

Natalie Seftas September 30, 2002

DESCRIPTION OF RESULTS (Cont'd):

SA3 Slew performance Parameter Requirement SA3 Performance
+SA3 Average = 1.027 Degrees -SA3 Average = 0.837 Degrees

SA Position Error
(35 Samples)

+/- 3.5 Degrees from Commanded Position

SA Profile Error
(20 samples)

< 10 Degrees

+SA3 Average = 3.122 Degrees -SA3 Average = 2.756 Degrees

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HST MOSES

Electrical Power Subsystem
INSTRUMENT OR SUBSYSTEM: REQUIREMENT: J10.4.14.1.2 "Verify that SA3 will provide sufficient power to support HST's load range. Power performance will be assessed and compared to begin ning of life predicts that account for expected degradation. " RELEVANT SMOV PROPOSAL : NONE DESCRIPTION OF METHODS: Power measurements will be calculated when HST is at orbit noon, when the sun vector is within +/-10 degrees of the ­V1 axis, when the solar array to sun incidence angle is less than 5 degrees and when all CCC K -relays and SPA Trim Relays are closed. DESCRIPTION OF RESULTS : HST power performance has exceeded BOL predictions. Results shown on following graph, `SA-3 Actual and Predicted Total Output'. REQUIREMENT STATUS: SUPPORTING DOCUMENTATION : SATISFIED NONE SA3 Power System Performance

Natalie Seftas September 30, 2002

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HST MOSES

Natalie Seftas September 30, 2002

Electrical Power Subsystem

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HST MOSES

Electrical Power Subsystem

Natalie Seftas September 30, 2002

INSTRUMENT OR SUBSYSTEM: PCU-R Performance REQUIREMENT: J10.4.14.2.1 "Verify that PCU-R will support HST's charging." RELEVANT SMOV PROPOSAL : NONE DESCRIPTION OF METHODS: PCU-R performance will be validated by verifying battery voltages a re within expected values. Bus voltages, Bus impedance, load currents and structure currents will also be monitored to ensure correct power performance. Verify SA output and SPA Trim Relay and CCC -K Relay operation via status telemetry and current flow. DESCRIPTION OF RESULTS : Battery voltages; battery, solar array, load and structure currents are verified as nominal. Minor adjustments have been identified as necessary fo r the bus voltages. Database calibration changes will be included in the next operational database build. PCU-R performance is nominal. CCC-K Relays and SPA Trim Relays are opening as expected. Battery Impedance is negligible. View following graphs. REQUIREMENT STATUS: SUPPORTING DOCUMENTATION : SATISFIED NONE

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HST MOSES

Natalie Seftas September 30, 2002

Electrical Power Subsystem
CCCK Relay Openings Since SM3B March 6, 2002 - August 8, 2002
250

200

No. of cycles

150 K Relay 100

50

0
CCCK11 CCCK12 CCCK32 CCCK42 CCCK51 CCCK52 CCCK61 CCCK21 CCCK22 CCCK31 CCCK41 CCCK62

Relay Figure 1

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HST MOSES
September 30, 2002

Electrical Power Subsystem
Trim Relay Openings Since SM3B March 6, 2002 - August 8, 2002
2500 2250 2000 1750
No. of cycles

1500 1250 1000 750 500 250 0
C%DDSPA C_CCSPA C%EESPA C%CCSPA C%BBSPA C_DDSPA C%ASPA C%CSPA C%BSPA C%DSPA C%ESPA C_DSPA C_CSPA C_ASPA C_BBSPA C%AASPA C_AASPA C_EESPA C_BSPA C_ESPA

Trim Relay

Trim Relay Figure 2

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HST MOSES
September 30, 2002

Electrical Power Subsystem

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