[Dsg-hallb_magnets] [New Comment] Solenoid fast dump at 2416 A

[Brian Eng]

I just checked and I doubt it's a timing shift (assuming we don't find anymore fastdaq issues).

The time offset of the solenoid fastdaq cRIO compared to the PLC (granted the torus PLC is the master) is generally in the single digit ns.

I'm sure if I actually captured the statistics of that there might be some outliers, but I would be shocked if it even got to the 100 ns level.

----- Original Message -----
> From: "Nick Sandoval" <sandoval at jlab.org>
> To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>
> Sent: Saturday, September 29, 2018 6:07:23 PM
> Subject: Re: [Dsg-hallb_magnets] [New Comment] Solenoid fast dump at 2416 A

> The timing of this fast dump does not seem right.   The post shows the SOE relay
> opened ~100mS after voltage tap and IDCCT movement.  Not the 280mS before
> movement shown from 100A tests(plc fast SOE), or the ~110mS before movement as
> seen from (8/30 dump, QD2 relay).
> 
> We either have a timing shift or something caused this dump that was not
> captured by the SOE.  Are all other taps quiet before the dump as well?
> 
> 
> ----- Original Message -----
> From: "Pablo Campero Rojas" <campero at jlab.org>
> To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Pablo Campero Rojas"
> <campero at jlab.org>
> Sent: Saturday, September 29, 2018 2:40:02 PM
> Subject: [Dsg-hallb_magnets] [New Comment] Solenoid fast dump at 2416 A
> 
> Solenoid fast dump at 2416 A
> 
> 
>    * Edit
>    * Delete
> 
> 
> Lognumber 3600579 . Submitted by campero on Sat, 09/29/2018 - 11:53 .
> There is 1 comment...
> Solenoid Fast DAQ data
> new
> 
> by campero on Sat, 09/29/2018 - 14:36
> 
> 
> It seems like QD#1 channel 1 upper went first after it exceded its threshold of
> 200 [mV].
> Attached is the screenshot of the FastDAQ data - voltage signals on the QD#1
> channel 1-4 before Solenoid tripped at 2416 A.
> -J(Removing Jitter) - S (Forcing sync) -D (duplicate timestamp correction)
> option used to get FastDAQ plots.
> No changes made for the Solenoid control systems during this trip. As requested
> by Probir PLC, QDs and MPS were reseted to enable the next Solenoid ramp up.
> Cryogenics auto recovering seems to be stable, at this time (2:36 PM) the T
> average for coils ~ 6.28 K and Magenet reservoir its being fill with helium
> LL8670 ~ 21%.
> Logbooks: 	HBSOLENOID
> Entry Makers: 	campero, rfair, ghoshal
> 
> 
> Solenoid fast dump at 2416 A at 08:56:55 , the SOE PLC timestamps shows that it
> was initiated by QD#1.
> Attached find PLC sequence of events and timestamps.
> 
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