[dsg-svt] SVT Cooling System Trip Analysis (Hardware Interlock)

[Peter Bonneau]

Attached is a myaPlot chart of the trip today at 9:17:09.
Sequence of events as seen by the hardware interlock system:

1) 9:17:01 - Cooling pressure starts dropping.
2) 9:17:03 - Cooling in-flow starts dropping.
3) 9:17:07 - Cooling in flow drops to .5L/m - Interlock limit=.5,  cool 
in-flow status = 1 (Fault).
4) 9:17:09 - After the 2 sec delay (current delay setting) - Cooling 
in-flow latched error.
Hardware interlock operating correctly during this event.

I saw the same for the trip yesterday.

We could increase the trip delay time for troubleshooting.

------------------------------------------------------------------------
*From: *"Yuri Gotra" <gotra at jlab.org>
*To: *"Peter Bonneau" <bonneau at jlab.org>, "dsg-svt" <dsg-svt at jlab.org>
*Sent: *Thursday, August 9, 2018 8:53:51 AM
*Subject: *Re: [dsg-svt] SVT HFCB temp R3S1T/B

These readings have been unstable or failing completely for the past 
months. I asked Brian to look into it. He fixed the issue several times 
when there was direct wire connection to the patch panel blocks. Now 
there are connectors but the problem is still there.

There is also a failing reading Humidity SB3.

Yesterday there were 2 SVT trips. I disabled the coolant pressure 
interlock in the evening, no trips overnight. Enabled it again. A log 
with interlock trip time stamps would be very helpful to debug the trips.


On 8/9/18 8:20 AM, Peter Bonneau wrote:

    R3S1T & R3S1B temperature sensor readings are unstable and has
    increased over the last hour from nominal (~-4.9C) to 25 - 30C.
    Low voltage/current readback for R3S1T/B is normal.
    All other HFCB temperatures are normal.


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