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HAM-ISI Medm Screens and Troubleshooting (introduction). Hugo Paris for the SEI team. MEDM Screens. Main. Safety. ON/OFF. Basis change Cartesian => Local. Actuators. Sensors L4C CPS GS13. Processing Sensor blend Damping Isolation. Basis change Local => Cartesian. Sensors. - PowerPoint PPT Presentation
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1
HAM-ISIMedm Screens and Troubleshooting
(introduction)
Hugo Paris for the SEI team
2
MEDM Screens
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Main
Sensors• L4C• CPS• GS13
Basis changeLocal => Cartesian
ProcessingSensor blend
DampingIsolation
Basis changeCartesian => Local
Actuators
ON/OFFSafety
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Sensors
Calm environment:
L4C 0 +/- 400cts
CPS 0 +/- 400cts
GS13 +/- 12000
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Input Filters (INF)
L4C
• Calibration• Gain
CPS
• Calibration
GS13
• Calibration• Symmetrization• Gain• Dewhitening
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Input Filters (INF)
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Coordinate Transform Matrices
① Open Matlab®
② Load Paths:HAM-ISISEI
③ Set Variables:IFO = 'X1'; Chamber = 'HAMX';Direction = 'X';Set_Gains = 1;
④ Run:Populate_MEDM_Screen_HAM_ISI(IFO,Chamber,Direction,Set_Gains)
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Damping
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Blend
10-2
10-1
100
101
102
103
100
Frequency (Hz)
Am
plitu
de
Stage 2 - RY to RY, GS13 - 05/26/09
10-2
10-1
100
101
102
103
-100
0
100
Frequency (Hz)
Pha
se
CPSSeismometer
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Blend
¥
• We don’t know the perturbation:???• Measure the motion of the platform: Blend• Counteract with actuators: ISO Loops
??? Platform motion
ISO Loops
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ISO Loops
+ High performances- Risks of Instability
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Watchdogs
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CPU check
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Conclusion
We want:
• Input filters - ON• Coordinate Transform Matrices - Loaded• Damping loops - ON• Isolation filters - ON• WD - Safe• CPU - OK state
Guardian will help
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Troubleshooting
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Power Spectra
Broken Flexure…
DTT or Matlab®
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Transfer Functions
Measured/processed via Matlab®More details in E1000309
① Run/Save excitation: Run_Exc_Batch_X1_HAMX.m. ② Retrieve time series + Process/Save TF data: Run_Get_Batch.m③ Concatenate/display/save TFS:
Step_1_Plot_TF_Loc_to_Loc_X1_ISI_HAMX.m
We wantSymmetryLow noise
Results comparable to reference
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Example #1
IN-Field cables misconnectedBad connection on GS13 cables => Gain of 1/2
GS13 connections mismatched => reading cross-coupling
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Example #2
Mechanical issueGS13 not torqued against the ISI
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Thank you