[Dsg-hallb_magnets] [Hallb-engineering] [New Logentry] Follow-up Re: Follow-up Re: TR8122A Flakey Readout

[Brian Eng]

Strictly speaking, no.

However, if there are sensor read back issues then it’s probably already gone into a controlled ramp.

The cRIO especially handles quite a large number of sensors (all but a small handful that are readout by other hardware [e.g. the cryo-cons]) and each LV chassis also has a large number. It’s hard to say off hand which are interlocked or not.



I would always play it on the safe side and ramp the magnets down such that if they do dump there isn’t any time spent waiting on cryo recovery.

On Jun 10, 2024, at 4:33 PM, Eugene Pasyuk <pasyuk at jlab.org> wrote:

Thanks for taking care of this.

Just to clarify for the future, if we ever need to reset cRIO and/or LV, the magnet must be OFF, right?

-Eugene





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From: Hallb-engineering <hallb-engineering-bounces at jlab.org> on behalf of beng--- via Hallb-engineering <hallb-engineering at jlab.org>
Sent: Monday, June 10, 2024 16:15
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Subject: [Hallb-engineering] [New Logentry] Follow-up Re: Follow-up Re: TR8122A Flakey Readout

Follow-up Re: Follow-up Re: TR8122A Flakey Readout<https://logbooks.jlab.org/entry/4310411>

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Lognumber 4310411<https://logbooks.jlab.org/entry/4310411>. Submitted by beng<https://logbooks.jlab.org/user/beng> on Mon, 06/10/2024 - 16:14<https://logbooks.jlab.org/entries?start_date=1718046892&end_date=1718054092&book=DSGLOG&book=HBTORUS>.
Logbooks:       DSGLOG<https://logbooks.jlab.org/book/dsglog> HBTORUS<https://logbooks.jlab.org/book/hbtorus>
Entry Makers:   ambrown
References:     4308937 - Follow-up Re: TR8122A Flakey Readout<https://logbooks.jlab.org/entry/4308937>
Tried stopping and starting the VI running on the cRIO to recover the readout. Wasn't expecting this to work (and it didn't) but this can be done remotely so it was tried first.
Next Aaron power cycled LV chassis #1 via the switch on the back of the chassis. This brought back TR8122A, but all the relief valve temperatures were bad (~30K instead of ~300K).
The VI was stopped/started again (this is the functionally the same as power cycling the cRIO itself) which recovered all the channels.
In the future to recover bad sensor readouts both the LV chassis and the cRIO should be restarted in that order: LV chassis first then cRIO last.

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