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Revision 3 as of 2007-02-07 17:33:36
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Editor: PierreRoyer
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Revision 4 as of 2007-02-08 11:06:14
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Editor: PierreRoyer
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Deletions are marked like this. Additions are marked like this.
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|| PACS_Spec_HK_Setup_OBS || Sets DPU HK List to SPEC BOTH           || || ||
|| PACS_Spec_Gra_Diaghk_SINCOS_Setup_OBS || Starts the grating specific Diaghk flow || || ||
|| PACS_Spec_HK_Setup_OBS ||                                         || Sets DPU HK List to SPEC BOTH || ||
|| PACS_Spec_Gra_Diaghk_SINCOS_Setup_OBS || || Starts the grating specific Diaghk flow || ||

1. Conditions

All tests described can be executed from SAFE MODE of from SPECTROSCOPY. As these tests do not ensure that the grating remains configured with senseful controller parameters, it is safe to end them by sending the SAFE MODE OBCP

One should care that the DPU_HK_LIST command has been commanded to "SPEC - BOTH". This is performed by the PACS_Spec_HK_Setup_OBS.cus script.

Their analysis relies only on HK & diagnostic HK data.

2. PID

The following test loops over a serie of sets of grating PID parameters.

Script

Parameters

Comments

Duration [sec]

PACS_Spec_HK_Setup_OBS

Sets DPU HK List to SPEC BOTH

PACS_Spec_Gra_Diaghk_SINCOS_Setup_OBS

Starts the grating specific Diaghk flow

CONF_grating_OBS

calUname="CONFGrat" calUrow=<default>

Configures the grating with default parameters

198

PACS_Spec_Gra_PID_loop_OBS

A reasonable grid of PID parameters must be hardcoded

619

PACS_Diaghk_Reset_OBS

PACS_SAFE_MODE.tcl

3. Grating Behaviour Characterisation

Once a possibly acceptable set of PID parameters has been found, the grating behaviour should be characterised in all its aspects. This is the goal of the following tests.

3.1. Grating Healthcheck

This test homes the grating a number of times, on both sides of the grating range, and performs large amplitude movements in between. It allows to check for the grating range, the presence or absence of hard points in the path, the behaviour of the driving current throughout the range and it allows to establish the GRAT_CUR_POS vs HALL A & B characteristics.

3.2. Slew Time Cal

This is the main grating characterisation test. It performs series of grating movements of all amplitudes, all over the grating range

3.3. PID Check ("Tune PID")

This test performs a set of small amplitude movements every 5 degrees of the grating range.

Herschel: PACS/FM_ILT_Procedures/TestProcedures/ControlLoopOptimisation/GratingPid (last edited 2009-07-15 14:32:37 by localhost)