File $Source: /home/juda/www/hrc_flight/RCS/i_mcp_hv_up.html,v $
Version $Revision: 1.7 $
Last Update $Date: 1999/05/10 18:08:08 $
HRC CCB Status Approved

OP03 Procedures op03:

HRC Command Sequences

HRC-I MCP Auto HV Ramp-up - SCS #89

Description:

In this sequence the HRC-I MCP HV level is raised, in a series of steps, from a reduced, "standby" level up to the final operating level. this sequence is expected to run autonomously. At each step the HVPS current limit is disabled, the bottom MCP HV level is set, the top MCP HV level is set, and then the current limit is enabled. The order of raising the HV is used to minimize HV gradients that might damage the MCPs.

Cautions/Restrictions:

This sequence must not be used unless the pressure at the HRC detector housing is less than 10-5 torr. Also, the HRC detector housing door must be open before this sequence is executed.

Delta-Time Command Mnemonic Description Cmd Field Mnemonic Data Parameter Telemetry Verifier Expected Value Notes
00:00:01.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 53 2IMTBHV2 53 2IMBPAST 53 sd0b35
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 42 2IMTTHV2 42 2IMTPAST 42 sd0a2a
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01
00:00:30.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
30 second delay for HV to settle
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 61 2IMTBHV2 61 2IMBPAST 61 sd0b3d
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 50 2IMTTHV2 50 2IMTPAST 50 sd0a32
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01
00:00:30.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
30 second delay for HV to settle
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 68 2IMTBHV2 68 2IMBPAST 68 sd0b44
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 57 2IMTTHV2 57 2IMTPAST 57 sd0a39
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01
00:00:30.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
30 second delay for HV to settle
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 76 2IMTBHV2 76 2IMBPAST 76 sd0b4c
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 65 2IMTTHV2 65 2IMTPAST 65 sd0a41
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01
00:00:30.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
30 second delay for HV to settle
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 83 2IMTBHV2 83 2IMBPAST 83 sd0b53
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 72 2IMTTHV2 72 2IMTPAST 72 sd0a48
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01
00:00:30.000 2IMCLDS Imaging HVPS current limit disable     2IMCLST DISA sd0c00
30 second delay for HV to settle
00:00:01.000 2IMTBHV Set imaging bottom MCP HV step to 89 2IMTBHV2 89 2IMBPAST 89 sd0b59
00:00:01.000 2IMTTHV Set imaging top MCP HV step to 77 2IMTTHV2 77 2IMTPAST 77 sd0a4d
00:00:02.000 2IMCLEN Imaging HVPS current limit enable     2IMCLST ENAB sd0c01

$Log: i_mcp_hv_up.html,v $

Revision 1.7 1999/05/10 18:08:08 jhc

corrected initial time delay to 1 sec

Revision 1.6 1998/05/18 15:47:27 juda

corrected telemetry verifier mnemonics for MCP HV Step commands (2IMTPST -> 2IMTPAST and 2IMBPST -> 2IMBPAST)

Revision 1.5 1998/05/13 18:30:48 juda

Added "File" entry to version table

Revision 1.4 1998/05/06 20:47:46 juda

Added OBC SCS #

Revision 1.3 1998/05/06 19:17:06 juda

Marked as approved

Revision 1.2 1998/05/06 19:13:36 juda

Identified this as the "autonomous" version of the sequence

Revision 1.1 1998/05/06 12:30:31 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