[Dsg-rich] [Rich] FPGA temp alarm

[Marco Mirazita]

But we have a soft interlock shutting down the system if fpga 
temperature goes above 75 deg.


Il 2018-10-16 14:24 Tyler Lemon ha scritto:
> Hello Marco,
> 
> The hardware interlock system does not monitor FPGA temperatures. It
> monitors the RTDs installed in the EP.
> 
> The hardware interlock system did not trip off the electronics because
> the strange temperature readings were only seen on the FPGA
> temperature readouts.
> 
> Best regards,
> Tyler
> 
> -------------------------
> 
> FROM: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> TO: "Valery Kubarovsky" <vpk at jlab.org>
> CC: rich at jlab.org, "dsg-rich" <dsg-rich at jlab.org>
> SENT: Tuesday, October 16, 2018 8:16:06 AM
> SUBJECT: Re: [Rich] [Dsg-rich] FPGA temp alarm
> 
> Hi Valery,
> thank you, in fact my main worry was that the interlock didn't shut
> down
> the electronics.
> It would be anyway good to understand why we had this event.
> I saw from the strip charts that also the LV currents and voltages
> have
> frequent random spikes.
> Marco
> 
> Il 2018-10-16 13:55 Valery Kubarovsky ha scritto:
>> Marco,
>> If you take a more careful look you will find out that the LV was
> shut
>> down.
>> The HV was off. We investigate the reason. It is the first time we
> had
>> such an event.
>> Probably it was connected with the software update that was done
>> approximately at the same time.
>> Regards,
>> Valery
>> 
>> -------------------------
>> 
>>> FROM: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it>
>>> TO: dsg-rich at jlab.org, rich at jlab.org
>>> SENT: Tuesday, October 16, 2018 4:03:24 AM
>>> SUBJECT: [Dsg-rich] FPGA temp alarm
>> 
>>> Hi all,
>>> yesterday at about 4:20 pm jlab time I received several alarm
>>> messages
>>> saying that the FPGA temperatures reached values around 115 deg.
>>> Since it looked like a readout error, I checked the strip chart,
>>> where
>>> there is actually a spike in the readout at that time, but to
> values
>>> of
>>> the order of -10^5. See the attached plot.
>>> So, it is clear that it was a readout error, but it is strange that
>>> the
>>> alarm message and epics report different values.
>>> Also, according to the logbook, the electronics was not shut down
> by
>>> the
>>> interlocks, as should have happened if the temperature really went
>>> above
>>> 100 deg.
>>> So, perhaps the values reported in the alarm messages are not the
>>> correct ones?
>>> Marco
>>> 
>>> _______________________________________________
>>> Dsg-rich mailing list
>>> Dsg-rich at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/dsg-rich
>> 
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