File $Source: /home/juda/www/hrc_flight/RCS/pcfg_a_rdnt.html,v $
Version $Revision: 1.3 $
Last Update $Date: 1999/05/10 18:08:08 $
HRC CCB Status Approved

OP03 Procedures op03:

HRC Contingency Command Sequences

Power configure HRC to use CEA A with Redundant Power Bus

Description:

This sequence uses high-level pulse commands to configure the HRC electronics power configuration to use the HRC Power Bus B (the redundant bus) for the prime central electronics assembly (CEA) and all of the HV power supplies. First all the HRC failsafes are disabled and both the A and B side +5V supplies are switched to the OFF state. Then the power bus "B" is selected for use by CEA A. Bus A is selected for CEA B, HRC-I HVPS, HRC-S HVPS, Shield PMT#1 HVPS, and Shield PMT#2 HVPS. This configuration may be used in the event of an anomaly with the HRC primary power bus.

This command sequence is based on the HRC EGSE script pcfg09.cmd

Cautions/Restrictions:

This sequence should be executed and the results verified before the HRC bus power is switched on. At least 1 major frame of data (32.8 sec) must have passed after the commands have executed for this verification to be performed.

Flow Diagram

Delta-Time Command Mnemonic Description Cmd Field Mnemonic Data Parameter Telemetry Verifier Expected Value Notes
00:00:01.000 2FSMRDI Disable Failsafe Master Relay     2FSMRST DISA hlp24
00:00:01.000 2FSCSDI Disable Failsafe Cal Source Relay     2FSCAST DISA hlp28
00:00:01.000 2FSPYDI Disable Failsafe +Y Shutter     2FSPYST DISA hlp66
00:00:01.000 2FSNYDI Disable Failsafe -Y Shutter     2FSNYST DISA hlp6a
00:00:01.000 205VAOF +5V LV Power Supply A Off     2PS5AON OFF hlp3f
00:00:01.000 205VBOF +5V LV Power Supply B Off     2PS5BON OFF hlp7f
00:00:01.000 2C1BBSL Bus B Select, CEA A LVPS     2C1LVBS BUSB hlp33
00:00:01.000 2C2BASL Bus A Select, CEA B LVPS     2C2LVBS BUSA hlp74
00:00:01.000 2IMBASL Bus A Select, HRC-I HVPS     2IMHVBS BUSA hlp34
00:00:01.000 2SPBASL Bus A Select, HRC-S HVPS     2SPHVBS BUSA hlp76
00:00:01.000 2S1BASL Bus A Select, Shield PMT#1 HVPS     2S1HVBS BUSA hlp37
00:00:01.000 2S2BASL Bus A Select, Shield PMT#2 HVPS     2S2HVBS BUSA hlp78

$Log: pcfg_a_rdnt.html,v $

Revision 1.3 1999/05/10 18:08:08 jhc

corrected initial time delay to 1 sec

Revision 1.2 1998/11/16 21:21:53 juda

corrected bus assignments for the MCP and PMT HVPS (should all be Bus A = CEA A) - added EGSE script reference - labeled as a contingency sequence

marked as approved

Revision 1.1 1998/10/16 18:24:08 juda

Initial revision

Dr. Michael Juda
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Mail Stop 70
Cambridge, MA 02138, USA
Ph.: (617) 495-7062
Fax: (617) 495-7356
E-mail: mjuda@cfa.harvard.edu