KN/JN Safety Interlock Operation

            November, 2007  J.W.K.

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Logic Description

 

 

Belts Enabled:

   Vault Swept* and Locked

    OR

    Vault open on override after being swept and locked

 

 

Charging Enabled

   Belts enabled

   AND

      Vault Key in panel

   AND

      Beam stops in

      OR

      Target room Swept* and Locked

 

 

Beam Stop Removal Enabled

   Key 10 in console panel

   AND

       Key 3 in panel

       OR

       Door 3 override

   AND

   Target room Swept*and Locked

   AND

   Charging enabled

   AND

   Ion Source emergency stop button not engaged

 

 

 

 

*Note: “Sweeping” a room doesn’t require a broom. It consists of pressing the Room Clearing Alarm button, starting the warning noise in the room. A timer is then started allowing typically 30 seconds until the room door must be closed and locked. The purpose is to force the experimenter to walk through the room (the button is placed across the room from the door) checking for anyone still in the room. The time delay is to insure that there is only minimum delay between starting the alarm and closing the door so that no one can slip into the room after the button is pressed but before the door is closed.

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Operational Procedures

      To operate accelerator:

      1)   Check that both vault emergency stop buttons/switches are disengaged

2)   Sweep and lock vault (press initialize button and close and lock gate within time allotted)

3)   Put vault key in console box and turn

4)   Belt may now be started

5)   Put all beam stops in

6)   Turn on charging

 

To put beam into target room:

1)      check to be sure emergency stop button in ion source area is disengaged

2)      Put chain in place across door 10

3)      Sweep and lock target room (press initialize button and close and lock gate 3 within allotted time).

4)      Put keys 10 and 3 into console box

5)      Remove beam stop

 


 

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Entering Target Room while running

 

No Override

 

            Take door 3 key from panel – beam stops will go in

            Open door 3 – accelerator belt and charging stay on

            ---

            Sweep and lock room

            Put door 3 key in panel

            Remove beam stop and continue running

Override

          Put door 3 override key in panel

            Take door 3 key from panel – beam stop will remain out

            Open door 3 – accelerator keeps running, beam stops remain out

            ---

            Close door 3

            Put door 3 key back in panel

            Remove door 3 override key from panel


 

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Entering Vault while running

 

No Override

 

            Take vault key from panel – charging will shut off

            Put vault key into door box and turn to unlock door, open door – belt will shut off

            ---

            Sweep and lock vault. Green light on key box will indicate vault swept and locked

            Put vault key in console box – belt may now be restarted. Charging may be turned             on if target room still swept and locked or if beam stops are in.

 

Override

 

            Put vault override key in console panel

            Take vault key from panel – charging will shut off

Put vault key in door box and turn to unlock door, open door – belt will keep

    running

            ---

            Close vault door and remove key from box – vault stays “swept and locked”

            Put vault key in console box – charging may be turned back on if target room still          

                swept and locked or if beam stops are in.


 

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Emergencies

 

            Pressing red emergency button outside vault or throwing switch inside vault will

                immediately turn off belt and charging and disengage door latch.

 

            Pressing red emergency button in ion source area will release yellow chain across

               door 10 and put in beam stops. Removing chain turns on room lights. If beam

stops are not signaling that they are in when chain is removed,  charging will be shut off.  

 

Resuming running will require resetting emergency button and sweeping and

locking room again. Resetting the emergency button will prevent chain from being reinserted without key. Key 10 must be brought from console to reinsert chain and then room sweep sequence repeated after chain replaced.


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Use of Maintenance Key

 

The maintenance key is to be used ONLY to allow operation of both belt motors and charging supplies on the JN and KN accelerators. Turning the key in the box in the vault (the same box with the button pressed to initiate locking the vault) will cause both belt and charge enable lights on the Control Box to come on. There is also a red LED which will be flashing while the maintenance key is in use.

Turning the maintenance key will also disable the vault-locking alarm button, preventing locking the vault for normal running when in maintenance mode.

Note the maintenance mode is to be used ONLY during open-tank maintenance of the accelerators. It is NEVER to be used during normal running.