[Dsg-hallb_magnets] [New Logentry] MPS Communication and Low Current Testing

Mon May 1 17:41:19 EDT 2017

Excellent thank you

Ruben

> On May 1, 2017, at 5:10 PM, Pablo Campero <campero at jlab.org> wrote:
> 
> 
> Hello Ruben,
> 
> Fixed ramp rates for the Solenoid MPS were modified as follows:
> 
> Current Range [A]	Fixed slew rates [mA/s]
>  0 - 1700	700
> 1700 - 2416	400
> 
> They will be enable only after commissioning as we agreed, for now the 'fixed ramp rates' from the PLC MPS Control program was commented out and they're not used, which means that now we are able to  to type in any ramp rates (Slew rates) in the slew rate input box on the MPS control screen.
> Additional the maximum current was changed to  2435 [A] .
> Latest version of the PLC program is running in the Solenoid PLC and also it can be found in the next link at GitHUB: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_clas12-2Dplc_&d=DwIFAg&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=L8L9Rj4_BTy7hXw9blwp570eG4Gv0JK0ned2ehCHUR8&m=F-D5gGuLrqxkQ0gdd51wB7AzD_IcvnWu86C6kcd8WQE&s=H9P4yBHxDaUnK7BADG0xSe2TZgOUBoUBJCSsuXokaQU&e= 
> 
> Best Regards
> Pablo 
> 
> From: "Ruben Fair" <rfair at jlab.org>
> To: "Brian Eng" <beng at jlab.org>
> Cc: "Scot Spiegel" <spiegel at jlab.org>, "Wesley Moore" <wmoore at jlab.org>, "Sarin Philip" <philip at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Krister Bruhwel" <bruhwel at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>
> Sent: Friday, April 28, 2017 3:11:06 PM
> Subject: Re: [Dsg-hallb_magnets] [New Logentry] MPS Communication and Low Current Testing
> 
> Ok thank you.
> 
> Pablo - please make a note to ensure the changes are made.
> 
> Cheers
> 
> Ruben
> 
> 
> From: "Brian Eng" <beng at jlab.org>
> To: "Ruben Fair" <rfair at jlab.org>
> Cc: "Scot Spiegel" <spiegel at jlab.org>, "wmoore" <wmoore at jlab.org>, "Sarin Philip" <philip at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Krister Bruhwel" <bruhwel at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>
> Sent: Friday, April 28, 2017 3:08:10 PM
> Subject: Re: [Dsg-hallb_magnets] [New Logentry] MPS Communication and Low Current Testing
> 
> In that case all the current values used in testing we did today were half what they should have been.
> 
> That doesn't effect the results of the testing any since the set and readback use the same conversion numbers, but it will need to be changed when absolute numbers matter.
> 
> The limit in the PLC is currently +/- 2450 A.
> 
> > On Apr 28, 2017, at 2:58 PM, Ruben Fair <rfair at jlab.org> wrote:
> > 
> > Brian,
> > 
> > This is a 4000 A power supply - exactly the same as for the Torus.
> > 
> > But the operating current for the Solenoid is only 2416 A.
> > 
> > The maximum current rating for the vapor cooled leads is 2500 A
> > 
> > So we are only intending to run to a maximum current of 2435 A during the commissioning phase.
> > 
> > Regards
> > 
> > Ruben
> > 
> > 
> > From: "Brian Eng" <beng at jlab.org>
> > To: "Ruben Fair" <rfair at jlab.org>
> > Cc: "Scot Spiegel" <spiegel at jlab.org>, "wmoore" <wmoore at jlab.org>, "Sarin Philip" <philip at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Krister Bruhwel" <bruhwel at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>
> > Sent: Friday, April 28, 2017 2:53:27 PM
> > Subject: Re: [Dsg-hallb_magnets] [New Logentry] MPS Communication and Low Current Testing
> > 
> > What is the max current that the Danfysik can do for the Solenoid? For reference the Torus was 4000 A.
> > 
> > The document has references to 2416 A, but current the PLC is set to 2000 A.
> > 
> > If this value is set incorrectly the A <-> ppm conversion will be wrong.
> > 
> > > On Apr 28, 2017, at 2:24 PM, Ruben Fair <rfair at jlab.org> wrote:
> > > 
> > > Thank you Brian.
> > > 
> > > Yes - we shall reconvene next week to recheck a couple of the tests.
> > > 
> > > 
> > > Pablo,
> > > 
> > > Please remove the 'fixed ramp rates' from the PLC routine - we shall be using totally different ramp rates.
> > > 
> > > We will need to be able to type in ramp rates (Slew rates) in the slew rate input box on the MPS control screen.
> > > 
> > > If you are interested, the following attached document details what range of slew rates we will be using.
> > > 
> > > Regards
> > > 
> > > Ruben
> > > 
> > > From: "Brian Eng" <beng at jlab.org>
> > > To: "Ruben Fair" <rfair at jlab.org>
> > > Cc: "Scot Spiegel" <spiegel at jlab.org>, "wmoore" <wmoore at jlab.org>, "Sarin Philip" <philip at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Krister Bruhwel" <bruhwel at jlab.org>
> > > Sent: Friday, April 28, 2017 2:17:59 PM
> > > Subject: Re: [Dsg-hallb_magnets] [New Logentry] MPS Communication and Low Current Testing
> > > 
> > > Answers interleaved below.
> > > 
> > > > On Apr 28, 2017, at 2:03 PM, Ruben Fair <rfair at jlab.org> wrote:
> > > > 
> > > > Thank you Brian.
> > > > 
> > > > What do you mean by ' the ramp rate has fixed values now'?
> > > > What are these values?
> > > > For commissioning we will need to be able to vary the ramp rates just like we did for the Torus. Once commissioning is complete, then yes we can have fixed ramp rates and the user will not be able to change the ramp rate via the MPS control screen.
> > > 
> > > The ramp rates were copied from the Torus PLC routine.
> > > 
> > > 400, 500, 800 and 1500 mA/s depending on the current (which still have the Torus current values).
> > > 
> > > So trying to change the slew to something else just went back to the numbers in this routine. It should just be a simple matter of disabling this for testing.
> > > 
> > > > With regards the polarity, did what you observed match what the attached document states?
> > > > Table II, Page 5, Items l and m define polarity direction.
> > > 
> > > It does match, but I was mainly checking the positive and negative labels (not U/S and D/S).
> > > 
> > > I suspect this will need to be verified with a hall probe like with the Torus.
> > > 
> > > > Scot thinks that because there is a jumper fitted across the SOE string, this might be preventing the dump switch from physically operating.
> > > > If this is indeed the case, could we repeat the dump switch check next week with help from Scot?
> > > 
> > > Sure, the BLIST Krister created has an estimate of 2 weeks so there shouldn't be any issue with doing some more testing next week.
> > > <19 B000000400-P001 Hall B Solenoid Power-Up and Power-Down Procedure.pdf>
> 
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