From rock@quake.Stanford.EDUThu Nov 19 12:15:48 1998
Date: Fri, 13 Nov 1998 10:28:42 -0800 (PST)
From: Rock Bush <rock@quake.Stanford.EDU>
To: MDIERS <mdiers@mdisas>
Subject: Leonid preparations - MDI safing procedures

Attached are the MDI safing procedures for the upcoming Leonids meteor
storm. I have run these control files on the simulator, and they have
functioned correctly to the limits of the simulator (there being no
door mechanisms on the simulator).

The control files listed below can be found in the /mdisw/cfl/flight/src
directory on mdicmd and mdisas. They should be checkpointed and compiled,
and the safing instance updated. 

Regards, Rock

   **************************************************************

Procedures for Safing of the MDI Instrument

The MDI safing will power off the CCD camera, the Image Stabilization
System, and all mechanisms including the shutter, MTM motors, and the
PA/CAL wheels. After these subsystems are confirmed to be powered off, the
MDI controlled Optics Package heater will be turned on and adjusted to
compensate for the decreased thermal input to the Optics Package because
of the camera electronics being powered down. As a final step, the MDI
front door will be closed after verifying that the redundant mechanism
functions properly. 

The MDI safing procedures are detailed below.  It is estimated that the
MDI safing will take less than an hour to perform. 

	Record the MDI bus A current

	exec q_fl_safe_v01

	Verify that ISS, CCD camera and mechanisms are all powered off.

	Record the MDI bus A current

	exec q_fl_htr_config_v01

	  Adjust heater setpoint to "0"
	  Turn Optics Package Heater ON
	  Verify OP heater power is ON (mkpwhop)
	  Adjust heater setpoint to "63"

	Record the MDI bus A current

	exec q_fl_fd_close_v01

	  This procedure requires answering a prompt before sending 
	  door mechanism move commands. The mechanism moves are:
	    Open door mechanism 2
	    Close door mechanism 2
	    Close door mechanism 1

	The door switch status is checked after each move. If a check
	fails, the procedure will halt. The procedure should not be
	restarted without clearly understanding the check failure.
	If door mechanism 2 does not open and close properly, the front
	door will be left open.

	Verify that the front door is closed and door power is off.