Ion Mill   ID-2500   Backplane Power Connections
   --------------------------------------------------

                                             Initial Rev.  25-Aug-2021
                                             Current Rev.  26-Aug-2021


This file lists just the power connections provided to the
5 power modules by the backplane,  i.e. it covers just the
J2 and J3 connectors on the power modules.

The backplane makes the same 150 Volt bulk DC power connection
to each of the power modules.  Note that this bulk 150 V DC
power is  not  isolated from the line.  This is just full wave
bridge rectified raw line power as shown in the file:

    id_2500_support_brds_sch_0002.png


On the power modules their middle J2 connector receives this
bulk 150 V DC power.   J2 is a 7 pin connector.

    J2 Pin
    Number           Function
    ------    ----------------------------
       1       150 V Power Return
       2       150 V Power Return

       3       No Connection
       4       No Connection
       5       No Connection

       6       +150 V DC Bulk Power
       7       +150 V DC Bulk Power



J3 is the 18 pin connector at the right-hand bottom side of
the power modules when looking at the top side of the power
module.  On all power module, J3 is the power Output
connector and carries no other signals.

    J3 Pin
    Number                   Function
    ------    -----------------------------------------------

       1       Pins 1:4 are tied in parallel.  On Cathode and
       2       Neutralizer they are one side of the AC output.
       3       On Discharge and Beam they are the positive
       4       output.  On Accelerator they are the negative
               output.

       5       No Connection
       6       No Connection
       7       No Connection
       8       No Connection

       9       9 & 10 are used only on Cathode and Neutralizer
      10       power modules.  These pins are the center tap
               of the secondary of their output transformer.

      11       No Connection
      12       No Connection
      13       No Connection
      14       No Connection

      15       Pins 15:18 are tied in parallel.  On Cathode and
      16       Neutralizer they are one side of the AC output.
      17       On Discharge and Beam they are the  negative   
      18       output.  On Accelerator they are the positive
               output.



Backplane wiring from the power module outputs to the
ID-2500 rear panel output terminal strip.

   Cathode  1:4      AC Output  is wired to Output Terminal  11
   Cathode  9,10    Center Tap  is wired to Discharge 15:18
   Cathode 15:18     AC Output  is wired to Output Terminal  12

   Discharge  1:4   Pos Output  is wired to Output Terminal  10
   Discharge 15:18  Neg Output  is wired to Cathode 9,10

   Beam  1:4        Pos Output  is wired to Output Terminal  8
   Beam 15:18       Neg Output  is wired to Output Terminals 1 & 2

   Accel  1:4       Neg Output  is wired to Output Terminal  6
   Accel 15:18      Pos Output  is wired to Output Terminals 1 & 2

   Neut  1:4         AC Output  is wired to Output Terminal  4
   Neut  9,10       Center Tap  is wired to Output Terminals 1 & 2
   Neut 15:18        AC Output  is wired to Output Terminal  5


Output Terminal Strip Lugs 1 & 2 are connected together on
the Backplane and are the  ground   power return  and  are
connected to the chassis of the power supply.

Output Terminal Strip Lugs  3, 7, 9  are not used in our
Ion Gun setups and I believe that these output terminals
make no connection to Backplane circuit board traces.

Output Terminal Strip Lugs 8 & 10  must be jumpered together
when the power output cable is connected to the power supply.
That is,  both Output Terminals 8 & 10  are carried by a red
wire in our output cable, through pin C in the Amphenol
connector and to the Anode connection to the Ion Gun.