Rack Layout for the Run II Framework Racks
        ----------------------------------------------

                                                  Original Rev. 18-APR-1995
                                                    Latest Rev. 8-SEPT-1995


The height inside a rack is about 79.25".  This holds  45U  units of
equipment (1U is defined as 1.75").

The card files are 9U high.

The water cooler for each card file is 1U high.

The power supply sub rack for each card file is 3U high.

Question, How much space is left?

      45 - 3x9U - 3x1U - 3x3U = 6U

Question, Will a proper blower and air duct system fit in 6U, i.e. 10.5" ?



     Vertical Layout of Equipment in the Rack
    ------------------------------------------

             9U Card File Top
             1U Water Cooler

             9U Card File Middle
             1U Water Cooler

             9U Card File Bottom

             1U Air Duct
             6U Blower

             3U Power Supplies for Top Cardfile
             3U Power Supplies for Middle Cardfile
             3U Power Supplies for Bottom Cardfile


Notes:

1. The above layout assumes that  there is space in the rack for the air to
   exit out of the  Top Card File.  There is about 2 1/4" between the top of
   the highest piece of equipment in the rack and the top of the rack.

2. The above layout  assumes that  either the air can  enter a squirle cage
   blower from the side or else that there is some other way within the 6U
   allocated to the blower for the air to enter it.

3. 3U is thought to be sufficient for the Power Supplies for each Cardfile
   based on the following model using ASTEC Spectrum Series power supplies:

     Two of the ASTEC type VS4 modular power supply chassis per cardfile.
     Each VS4 is 5.00" high and 7.90" wide and between 11" and 12" deep.
     Two of the VS4 chassis would site on a shelf and still be under 3U.
     The power connections (208 VAC 3 phase input and DC output) would be
     at the rear of the rack.  Air flow is from the front of the rack
     towards the rear of the rack.   The example part numbers are:

       VS4-D1-D1-20   for two 3.3 Volt 240 Amp modules operating in parallel

     and

       VS4-D2-A2-A0-00   for a 5.0 Volt 240 Amp module plus a 5.0 Volt
                         60 Amp module plus a 2 Volt 60 Amp module.


4. A extractor fan is installed on top of the rack to help pull air through
   the cardfiles.  There is an air baffle around the top of the rack so that
   the extractor fan principlely pulls air through the cardfiles.

5. Framework equipment that does not have a home in these two racks:
     Power Control system for Run II Frameworks
     VME readout crate for the Run II Frameworks
     Serial Interface Link connections to the 128 Geographic Sections
     "patch panel" input for Terms coming into Level 1 Framework
     "patch panel" input for Terms coming into Level 2 Framework
     Panel space for routing signal cables from the front of the application
       cards to the backplane connectors.

6. Additional rack mechanical components:
     Rear DC power cable supports.
     Vertical Bars
     Shelves to hold card files...

7. Approximate Power Dissipation per rack
     2000 Watts per each of three cardfiles
     75% efficiency power supplies
       Total power dissipated inside the rack = 8000 Watts

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Rack and Crate Size

Outside a rack is 24" wide and 30 " deep.  The recess for the front panels
and rear door is 1".

A crate is 17 1/2" wide (in the card section) and 18 1/4" deep.

Thus the side clearance is about:
    24" - 17 1/2" = 6.5"     divided by 2 = 3 1/4"  on each side of the crate.

Thus the front to back clearance is about:
    30" - 18 1/4" - 2" = 9.75"  total front back clearance
          divided by 2 =  4.8"  clearance if split equally front back