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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

Email from Gerrit 

Basically the only thing that I remember is that there is an IST interlock 
line coming from what used to be called the 'Jim Thomas' box and an interlock 
line coming from the IST cooling system that goes directly from the cooling 
rack to the IST electronics rack. The 'Jim Thomas' IST interlock line is only 
dependent on the Inner Field Case interlock, I think. Both that IST interlock 
line and the IST cooling rack interlock line end up to a little panel sitting 
in the IST electronics rack and which 'translates' these two interlocks in 
interlock signals which go into the back of the IST electronics crates. 

Gerrit also suggested to ask Bill about the IFC interlock. It is great to see 
that Bill did it even before I asked him. 

Zhenyu

> On Aug 17, 2021, at 1:47 PM, Christie, William <christie AT bnl.gov> wrote:
> 
> Hi Christian,
>             I’m not certain exactly what you’re asking about with respect 
> to the “IFC OK to Run” signal. My recollection is that this signal was a 
> permissive (i.e. signal has to be present for system to operate) signal 
> that dates back to the time of the Silicon Vertex Tracker (SVT). The SVT 
> needed this signal to be present to turn on both their LV and HV on the 
> silicon detector that was installed in the IFC. I believe the SGIS logic 
> was that any one or more of the following alarms would drop this 
> permissive, and hence turn off all voltage to the SVT detector:
>       • Flammable gas alarm on either face of the TPC
>       • Flammable gas alarm from the IFC gas sampling port
>       • Smoke alarm on either face of the TPC
>       • Water leak alarm from inside the IFC (I believe we had a Trace Tek 
> cable inside the IFC during this period
> I think this signal would be a good choice to use as an interlock for the 
> new forward silicon disks.
>       Greetings,
>                   Bill
>  
> From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of "Videbaek, 
> Christian" <cvidebaek AT bnl.gov>
> Date: Monday, August 16, 2021 at 18:01
> To: "Capotosto, Michael" <capotosto AT bnl.gov>, "Visser, Gerard" 
> <gvisser AT indiana.edu>, "Ye, Zhenyu" <yezhenyu AT uic.edu>
> Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
> Subject: Re: [Star-fst-l] FST Interlocks Wiring Scheme
>  
> Hey Mike,
>  
> I was poking around in 2A8 and 2A9 this morning.
>  
> The Jim Thomas PLC connection is connected to a NO contact of the plug-in 
> relay in socket Z11 in 2A9.
> This relay is controlled by 'IFC OK to Run'.
> When closed, the FST wire is connected to the COM pin of the 
> 120VAC-to-24VDC supply on the flip down panel in 2A9.
>  
> The 'IFC OK to Run' wire is connected to a beige module in the top of 2A8.
> I couldn't see any labels on it, and didn't want to remove the panel to get 
> a look at the other side.
>  
> Zhenyu's diagram matches the wiring I looked at in 2A9, though some labels 
> have changed.
> Our FST signal is connected to the 'Enable FGT' signal on the diagram.
> 'SSD Enable' has been disconnected at the terminal block, and 'Enable PXL' 
> is disconnected at a coax connector under the east platform stairs.
>  
> Does anyone have any information on the 'IFC OK to Run / Global #3' signal?
> I poked around on Drupal and online, but haven't yet had any luck.
>  
> Christian
>  
>  
>  
> From: Capotosto, Michael <capotosto AT bnl.gov>
> Sent: Monday, August 16, 2021 5:16 PM
> To: Visser, Gerard <gvisser AT indiana.edu>; Ye, Zhenyu <yezhenyu AT uic.edu>; 
> Videbaek, Christian <cvidebaek AT bnl.gov>
> Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
> Subject: FST Interlocks Wiring Scheme
>  
> Hi Everyone, 
>  
> I traced out the FST Interlocks panel that’s mounted in 2C8, and just put 
> together a quick connection diagram for you all to review.
>  
> For the Jim Thomas PLC interlock – It looks like it ties back to a relay 
> contact, but I’m not sure which of the many it’s tied into. Zhenyu had 
> found this diagram (attached image), but it doesn’t call out IST, perhaps 
> we can ask Alexei to trace it out if it’s a concern which relay contact it 
> actually goes to (You have to remove a panel and flip it up to get access, 
> and probably cut some zip ties to trace the cable out, which contains 120V 
> at the moment)
>  
> --Mike 
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