File $Source: /home/juda/www/hrc_flight/contingency/RCS/safe.html,v $

Version $Revision: 1.2 $

Last Update $Date: 1999/07/07 14:51:50 $

HRC CCB Status Approved

OP03 Procedures op03:

HRC Contingency Procedures

HRC Emergency Safing

Description:

This procedure is to be used to safe the HRC, if autonomous safing fails. It should be implemented within a script so that it can be executed during real-time contacts in cases where both OBCs are off-line.

First both HRC MCP HV power supplies are turned off and their commanded output levels are set to zero. Then, if desired, the anticoincidence PMT HV power supplies are turned off and their commanded output levels are set to zero, Finally, if desired, the the HRC detector housing door is partially closed, first homing the HRC +/-Y Shutters if necessary.

Procedure Trigger:

This procedure should be run anytime that the observatory encounters an anomaly but fails to execute the HRC safing functions.

Procedure

HRC MCP HV Off (mcp_hv_off.html)
If the Antico. Shield PMT HV should be turned off (per SOT request)
- Antico PMT HV Off (antico_hv_off.html)
If the HRC Door should be 3/4 closed (if the HRC position is indeterminant or at the HRMA aimpoint)
- If the -Y shutter is not homed
  - "Home" -Y Shutter (home_negy.html)
- If the +Y shutter is not homed
  - "Home" +Y Shutter (home_posy.html)
- Door Position Cal Source (door_to_cal.html)

$Log: safe.html,v $

Revision 1.2 1999/07/07 14:51:50 juda

removed disable of mechanism failsafes and added comments to antico. and door "If" statements

Revision 1.1 1999/06/28 14:10:54 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

File	$Source: /home/juda/www/hrc_flight/contingency/RCS/safe.html,v $
Version	$Revision: 1.2 $
Last Update	$Date: 1999/07/07 14:51:50 $
HRC CCB Status	Approved