[Dsg-rich] [EXTERNAL] Re: AirFlow1 problem

[Tyler Lemon]

Valery,

If we temporarily stop all airflow to RICH and let pressure in the tank build to where it stops, and then restart flow, it might return the flow to normal.

If we do this, RICH would need to be powered off.

Can you turn RICH off so this can be done?

It would need to be done as soon as possible since the hall is getting ready to get beam.

Tyler
________________________________
From: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Tyler Lemon <tlemon at jlab.org>
Sent: Tuesday, March 3, 2020 2:01 PM
To: Marco Mirazita <Marco.Mirazita at lnf.infn.it>; Valery Kubarovsky <vpk at jlab.org>; Bob Miller <rmiller at jlab.org>
Cc: dsg-rich <dsg-rich at jlab.org>
Subject: Re: [Dsg-rich] [EXTERNAL] Re: AirFlow1 problem

Hi Valery and Marco

It looks like right before the lower airflow 1 reading, the buffer tank pressure did not reach the same upper pressure and also went to a lower pressure than usual. This is in the red box in the attachment. The drop in air flow is probably due to the system trying to catch up and get back to the normal operating pressure.

What is the status of the other RICH compressor that was removed from the hall? Last I heard Hall B Engineering was looking into repairing it.

Best regards,
Tyler


________________________________
From: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
Sent: Tuesday, March 3, 2020 1:57 PM
To: Valery Kubarovsky <vpk at jlab.org>
Cc: Tyler Lemon <tlemon at jlab.org>; dsg-rich <dsg-rich at jlab.org>
Subject: [EXTERNAL] Re: [Dsg-rich] AirFlow1 problem

The average flow is reduced and the temperature of the FPGA is
increasing.
This could be potentially dangerous, if the temperature keeps going up
we could reach the interlock limit.
Marco


Il 2020-03-03 13:41 Valery Kubarovsky ha scritto:
> Hi Tyler,
>
>  I got an alarm AirFlow1
>
>  PV: B_DET_RICH_INTLK_AIRFLOW1 - Description: MINOR alarm:
> B_DET_RICH_INTLK_AIRFLOW1 - Alarm Time: 2020/03/03 13:24:47.458 -
> Current Severity: MINOR - Current Status: LOW_ALARM - Alarm Severity:
> MAJOR - Alarm Status: LOLO_ALARM - Alarm Value: 394.37678458612845
>
>  Could you please take a look?
>  Probably we have a problem with the airflow sensor.
>
>  Thanks,
>  Valery
>
>
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> Dsg-rich at jlab.org
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