Section D - "HANGING" CTD HV hardware and program.

Exiting the CTD HV program, reloading the program, and CTDHV OS9 rebooting.

HANGING -
during normal operation the CTD HV screen in the control room is updated once every few seconds, although there are a few occasions (other than the initialisation phase) when normal updating is suspended for up to 20 seconds.

If the screen is not being updated.

1. Perhaps the OS9 program has hung. Go to the CTD HV computer in the VME crate at shoulder height in rack A2,06. The computer is the MVME147S module towards the left end of the crate. The "RUN" light on this module should be flashing continuously on and off. If it is not, the program has hung - see the section on reboot below.

2. If the computer is running O.K., look at the red coloured module in the VME crate labelled "model A200 SY127 controller". The "acc" and "data" leds in this module should be pulsing in a slightly irregular rhythm with a period of about 1 second.

If they are not pulsing then the "caenet" data connexion is not working. Try pressing the "reset" button on the "model A200 SY127 controller" a few times. If this does not restore the regular pulsing rhythm of the "ack" and "data" leds, then an OS9 reboot is necessary; go to the "reboot" section below.

3. If the two sections above are O.K., it may be that the terminal in the control room has hung. Switch off the mains power for the terminal (a black rocker switch on the base of the terminal) for a few seconds, then switch it back on again. If this restores updating of the display the problem is solved (if it happens often, replace the terminal). If this does not restore the updating of the display an OS9 reboot is necessary. Go to the "reboot" section below.

How to exit the CTD HV program

Before trying to exit the program, lock BBL3 switches 5 and 11 by flicking them to the left, otherwise HERA may lose the beams or bad data may be taken.
Then to exit the program type

exit

on the keyboard. This will bring down any HV in an orderly fashion and exit. Then proceed to the "program reload" or "reboot" section below as required.
If the program has hung and will not respond to an "exit" command try typing "control-E" on the keyboard (control-C will not work). Then proceed to the "program reload" or "reboot" section below as required.
If the above "exit" and "control-E" both fail, then any HV which is on must be removed by pressing in the red "emergency-off" button bewteen racks A2,06 and A2,07 in the rucksack. (If there is no HV on you do not need to do this.)
Then progress to the section below for program reload or OS9 reboot as described.

Reloading the CTD HV control program.

Before reloading the program, make sure BBL3 switches 5 and 11 are locked to the left, otherwise HERA may lose the beams or bad data may be taken.
Only one version of the program is allowed to run, so any presently existing versions must be exited, as in the "exiting" section above. If the ctdhv terminal is not logged in to the OS9 computer type (="return key") on the keyboard and a login prompt should appear on the screen.
Then type the login name

super

followed by the password

??????

This should be followed by a few lines of login information.
To reload the CTD HV program, just type the program name. The name of the current version of the CTD HV program is on a notice by the CTD HV control room display, together with any backup versions.
These names are typically "ctdhvxyz" where xyz changes with program version. Type

ctdhvxyz

to start the program.
The hardware initialisation phase takes about 3 minutes with a few different messages appearing on the screen. No keyboard commands are accepted until this phase is over.

Rebooting the CTD HV OS9.

Before reloading the program, make sure BBL3 switches 5 and 11 are locked to the left, otherwise HERA may lose the beams or bad data may be taken. Make sure there is no HV on any part of the CTD then to exit the program type

exit

on the keyboard. THis will bring down any HV in an orderly fashion and exit. Then proceed to the "program reload" or "reboot" section below as required.
If there is AC power O.K. on the CTD HV in VME crate at shoulder height in rack A2,06 then just press the "reset" button on the MVME147S computer module towards the left hand side of this crate.
This initiates a reboot which takes about 30 seconds. When it is finished, log in on the CTD HV terminal in the control room as described in the section "reloading the CTD HV control program" above.
If there is no power in the CTD HV crate in A2,06 check:

that the power is ON to rack A2,06 on the power control board in the corner of the rucksack (level A).
make sure that the "Hager trip" at the back of rack A2,06 for the HV VME crate is UP.(This Hager trip is labelled "Battery backup for hv disc").
make sure large orange coloured light, on the front of the crate at head height above the HV VME crate, is LIT. If it is not, call a CTD HV expert - see below.
if this lamp is LIT, press down and release the "local" switch on the "Wiener module" at the right hand side of the HV VME crate. The "local" green led should come on. Then lift up and release the top "power" switch on the Wiener module. This should switch on the power to the VME crate and a reboot should begin automatically.

Getting expert assistance

If problems persist you need expert assistance. Call the person whose name appears on the "CTD on-call" list or the "CTD HV expert" lists on the notice board by the control room door.
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