sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hi,

The PLC is always on. If the 24 V connection is bad, it'd trip again.  

You can see it from the key page via the opensyndi app.  Right now, pole tip doors interlocks are all in red.  But the watchdog timer is not.

Kin

-------- Original message --------

From: "Schultheiss, Carl" <carls AT bnl.gov>

Date: 11/5/24 11:02 (GMT-05:00)

To: "Yip, Kin" <kinyip AT bnl.gov>, "Zubarriain, Jonathan" <jzubarria AT bnl.gov>

Cc: "Costanzo, Timothy" <tcostanzo AT bnl.gov>, sphenix-magnet-l AT lists.bnl.gov

Subject: RE: sphenix watch dog timer fault

Hi,

 

   Can we run the PLC to see if we have any further Watch Dog Timer issues?

 

Carl

 

From: Yip, Kin <kinyip AT bnl.gov>
Sent: Monday, November 4, 2024 6:32 PM
To: Schultheiss, Carl <carls AT bnl.gov>; Zubarriain, Jonathan <jzubarria AT bnl.gov>
Cc: Costanzo, Timothy <tcostanzo AT bnl.gov>; sphenix-magnet-l AT lists.bnl.gov
Subject: RE: sphenix watch dog timer fault

 

Dear Carl,

 

You probably already assumed what I am going to say below.   I went to talk with Tim Costanzo this evening (in his CAS shift this evening).

 

He told me that the 24 V connection was so loose that it could cause problem even when there is no (relatively) violent action of closing/opening the door.  Though there is no way to prove,

Tim agrees that this loose connection could very well be the cause of the two mysterious Watchdog Timer interlocks (=> Magnet trips) that we’ve observed during the 2024 run (~6 months).

 

Richard (CAS) blamed me for not providing him this observation (opening/closing door => cause Watchdog Timer interlocks every time) such that he didn’t know to check about this location of wiring a

few months ago 😅  Well, I wasn’t fully aware of this and didn’t think of its significance because the Watchdog Timer interlock change is not important when we open/close the PS door (as the Magnet is

off, at 0 A).  We asked Tim to check after we/I saw this happened too often and we didn’t understand why this interlock should trip when the PS door closes/opens.

 

Kin

 

From: Yip, Kin
Sent: Monday, October 28, 2024 5:38 AM
To: Costanzo, Timothy <tcostanzo AT bnl.gov>; Rosas, Pablo J <rosas AT bnl.gov>
Cc: Schultheiss, Carl <carls AT bnl.gov>; Karl, Robert F <rkarl AT bnl.gov>; Moloney, John <jmoloney AT bnl.gov>
Subject: RE: sphenix watch dog timer fault

 

Thanks a lot.    I wonder whether this loose connection might have caused problems (like twice in the last 6 months) when you didn't open and close the door ?! 🤔

 

Kin

 

 

-------- Original message --------

From: "Costanzo, Timothy" <tcostanzo AT bnl.gov>

Date: 10/27/24 22:29 (GMT+00:00)

To: "Rosas, Pablo J" <rosas AT bnl.gov>

Cc: "Yip, Kin" <kinyip AT bnl.gov>, "Schultheiss, Carl" <carls AT bnl.gov>, "Karl, Robert F" <rkarl AT bnl.gov>, "Moloney, John" <jmoloney AT bnl.gov>

Subject: sphenix watch dog timer fault

 

Hi Pablo

 

John and I found that the sphenix PS watch dog timer fault was being caused by a loose connection on  the 24VDC (PS #5) din rail. We could see the fault come in when the door was opened and closed. We tighten the din rails screws, and tested, all seems okay now.

I will see you Tuesday.

 

Thanks Tim