File $Source: /home/juda/www/hrc_flight/macros/RCS/rad_zone_entry.html,v $

Version $Revision: 1.4 $

Last Update $Date: 1999/04/21 13:28:10 $

HRC CCB Status Approved

OP03 Procedures op03:

HRC Higher-Level Sequences

Radiation Zone Entry

Description:

This sequence is to prepare the HRC for radiation zone entry. The MCP HV of the active detector is lowered to half of its operational level and the command sequence to raise the HV is disabled. The dither control command sequence is terminated. The antico shield PMT HVPS are turned off and their commanded output steps set to zero. Finally, if the HRC detector housing door is open it is moved to the "mostly" closed position, making sure that the shutters are "homed" first.

Cautions/Restrictions:

None

Procedure

If HRC-I is the current detector in use
- Activate SCS #87 - HRC-I MCP HV Ramp-down (i_mcp_hv_down.html)
- Disable SCS #89 - HRC-I MCP Auto HV Ramp-up
Else HRC-S is the current detector in use
- Activate SCS #88 - HRC-S MCP HV Ramp-down (s_mcp_hv_down.html)
- Disable SCS #90 - HRC-S MCP Auto HV Ramp-up
Terminate SCS #91 - HRC Dither Control
If HRC detector housing door is OPEN
- If HRC shutters are not at the "Home" position
  - Home +Y Shutter (home_posy.html)
  - Home -Y Shutter (home_negy.html)
- Move HRC Door to "Mostly" Closed Position (door_safe.html)

$Log: rad_zone_entry.html,v $

Revision 1.4 1999/04/21 13:28:10 juda

marked as Approved

Revision 1.3 1998/12/15 17:17:36 juda

added HTML page names to link names in procedure list

Revision 1.2 1998/11/19 14:02:26 juda

added flow diagram

Revision 1.1 1998/10/15 20:15:24 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/macros/RCS/rad_zone_entry.html,v $
Version	$Revision: 1.4 $
Last Update	$Date: 1999/04/21 13:28:10 $
HRC CCB Status	Approved