[Dsg-hallb_magnets] IDCCT scaling in labview

[Tyler Lemon]

Hello Nick, 

Okay, just IDCCT1 scaling has been changed. 

The changes have been made in the LabVIEW and I will deploy it within the next few minutes. I will then set the modified program as the start-up application. It'll take maybe 15 minutes until the cRIO is back up. 

Best regards, 
Tyler 


From: "Nicholas Sandoval" <sandoval at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ruben Fair" <rfair at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
Sent: Wednesday, January 18, 2017 11:11:56 AM 
Subject: Re: IDCCT scaling in labview 

Hi Tyler, 

Please just scale IDCCT1. The reason is the PLC DINT data type is limited( -2,147,483,648 to 2,147,483,647). When we get the DINT in the PLC and the current is over 2,147A it 'freezes'. 

You can see this behavior in the archive when plotting both IDCCT(I_ZFCT in EPICs) and I_MPS(Danfysik readback) during the high current runs in November. 

We want to keep the resolution on the voltage taps the same, as we do not get close to this limitation. 

Thanks, 

Nick 

----- Original Message ----- 
From: "Tyler Lemon" <tlemon at jlab.org> 
To: "Nicholas Sandoval" <sandoval at jlab.org>, "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ruben Fair" <rfair at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
Sent: Wednesday, January 18, 2017 10:59:02 AM 
Subject: Re: IDCCT scaling in labview 

Hello Nick, 

Right now, the way IDCCT1 data is scaled by one million also scales the voltage taps by one million. 

Do we want the Voltage Taps to stay scaled by one million or should they also be changed to 100,000? 

Tyler 


From: "Nicholas Sandoval" <sandoval at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "Ruben Fair" <rfair at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org> 
Sent: Wednesday, January 18, 2017 10:40:07 AM 
Subject: IDCCT scaling in labview 

Hi Tyler, 

Can you please change the multiplier for IDCCT1 in the labview logic. I believe it is scaled by a million at the moment, please change it to 100,000. 

This will prevent us from hitting the hardware limit on the PLC readout. Let me know when you are complete as I will need to do the same in the PLC 

Thanks, 

Nick 
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