Experimental Facilities Division progress report 1996--97 Page: 38 of 238
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2 USER OPERATIONS
" Uninterruptible power supply to
protect against short-term AC power
loss
" Equipment racks, conduit, cable trays
and cables
Beamline PSS hardware
" User panels and status displays
" Door position sensors (mechanical and
magnetic)
" Door locking mechanism
" Search-and-secure boxes
" Emergency beam stop
" Visible and audible warning indicators
" Interfaces to critical devices that shut
down or mitigate the radiation hazards
" Equipment racks, conduit, cable trays
and cables
The PSS also provides for external watchdog
timer signals between the two PSS chains. If
this "heartbeat" signal skips a beat, the PSS
will cause a stored-beam abort.
Clearly, the user interface with the PSS
involves only beamline hardware. Beamline
PSS equipment (to which the user needs
access) falls into two categories: user control
panels and station hardware. PSS panels,
such as door access controls, shutter controls,
and mode controls, are in equipment cabinetslocated on the outside of the experiment
stations. These PSS cabinets are locked to
prevent uncontrolled access to wiring, but the
fronts are open to allow operation of the
control panels. These cabinets also contain
PLC I/O hardware for each PSS chain. The
PSS beamline control panels provide the
following user functions:
" a logical visual indication of the beam-
line status
" beamline shutter control
" the means to switch shutter control
among different stations on a beamline
" the means to change PSS beamline
operating modes- the means to reset PSS faults
* the mechanisms to administratively
take stations off-line and bring them
back on-line.
The most used of the PSS control chassis is
the station control panel, a typical layout of
which is shown in Fig. 2.7. This panel is
used to open and close safety shutters and
provide visible feedback regarding the status
of the accelerator, other experiment stations,
and the shutters.
The status display consists of a chain of LED
indicators laid out in a logical fashion consis-
tent with the beamline layout. Lamps are green
if the related devices or systems permit the
beam to be propagated down the beamline and
are red if configured to stop the beam.25
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Experimental Facilities Division progress report 1996--97, report, April 1, 1997; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc699281/m1/38/: accessed May 2, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.