[Dsg-hallb_magnets] cernox sensors 325K error

[Tyler Lemon]

Hello, 

The LabVIEW shows that the raw hexadecimal value for V1 and V2 from the LV Chassis are the same. Since December, the 325K error has happened seven times. Five of seven have all been Coil B Cerenoxes in LV Chassis 4; remaining two have been in VCL Cerenoxes in Chassis 1. 

This above could mean any of the below: 


    1. Something wrong in LV Chassis: five of seven sensors with 325K error were in same Chassis. Since we are reading back the same raw hexadecimal value for V1 and V2 when the error occurs, it could be a problem internal to the LV Chassis. 
    2. cRIO module is bad: Since the majority of the 325K errors are from the same LV Chassis, the port on the cRIO module could be bad and causing incorrect information to be sent/received. 
    3. Sensor cable is bad: The 325K error will also happen if the cable is broken or shorted 

In the mean time, the LV cRIO has been reset and I have also moved the latching indicators to show whether what is written to the LV Chassis by LabVIEW is the same when the 325K error occurs. 

Best regards, 
Tyler 


From: "Ruben Fair" <rfair at jlab.org> 
To: "David Kashy" <kashy at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Friday, February 10, 2017 7:55:00 AM 
Subject: Re: [Dsg-hallb_magnets] cernox sensors 325K error 

Ok - let's see what Tyler learns from the LV chassis output. 

Ruben 


From: "David Kashy" <kashy at jlab.org> 
To: "Ruben Fair" <rfair at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Friday, February 10, 2017 7:49:11 AM 
Subject: Re: [Dsg-hallb_magnets] cernox sensors 325K error 

We have a 325 on coil B now 



----- Original Message ----- 
From: "Ruben Fair" <rfair at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "kashy" <kashy at jlab.org> 
Sent: Thursday, February 9, 2017 4:50:28 PM 
Subject: Re: [Dsg-hallb_magnets] cernox sensors 325K error 

Ok Tyler - sounds like a reasonable approach. 

Regards 

Ruben 



From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "David Kashy" <kashy at jlab.org> 
Sent: Thursday, February 9, 2017 4:48:11 PM 
Subject: [Dsg-hallb_magnets] cernox sensors 325K error 

Hello Ruben and Dave Kashy, 

Before implementing the LabVIEW that will automatically reinitialize a Cerenox sensor if it reads 325K, a version will be deployed to look at the raw hexadecimal text output from the LV Chassis. As Peter mentioned below, this would tell us if the 325K error is caused by the LV Chassis or some conversion done in LabVIEW. 

Since we cannot force the 325K error, we will have to wait for the error to occur to compare the raw LV Chassis output. 

Best regards, 
Tyler 



From: "Amrit Yegneswaran" <yeg at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Thursday, February 9, 2017 2:44:31 PM 
Subject: Re: [Dsg-hallb_magnets] cernox sensors 

thanks peter and tyler. 


From: "Peter Bonneau" <bonneau at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org> 
Sent: Thursday, February 9, 2017 2:16:49 PM 
Subject: cernox sensors 

Hi Amrit, 

I looked at the LV cRio code with Tyler. 

They don't seem to know if the excitation chassis is the problem or the 
conversions, etc in the code. 

The data is sent to cRio as text via serial communications then 
immediately changed to a number for the calculations & lookup table. 

We've seen a lot of errors in serial communications in other 
instrumentation. 

I suggested to Tyler that we latch the received text numbers V1 and V2 
when this error occurs before the conversion to numbers. 

That will tell us if the excitation chassis is not sending or we're not 
receiving the raw data correctly. 

Thanks, 

Peter 

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