[Dsg-hallb_magnets] Hall B Solenoid load cell trends since Jan 1, 2019

[Ruben Fair]

Thank you Tyler.


We will have to check out these two load cells once we have better access to the solenoid. I'll speak to Denny.


Would you mind logging all this info in the log book - if not already done - really useful trend data.


Regards


Ruben

________________________________
From: Dsg-hallb_magnets <dsg-hallb_magnets-bounces at jlab.org> on behalf of Tyler Lemon <tlemon at jlab.org>
Sent: Wednesday, May 1, 2019 11:29:45 AM
To: dsg-hallb magnets
Subject: [Dsg-hallb_magnets] Hall B Solenoid load cell trends since Jan 1, 2019

Hello,

Following up on the email sent in October 2018 on load cell trends for the Hall B Solenoid, attached are plots showing the Solenoid's load cell readings since January 1, 2019.

As in October 2018, the plots are colored to indicate the power status of the Torus and Solenoid:
Blue:     Solenoid ON, Torus ON
Green:  Solenoid OFF, Torus OFF
Pink:     Solenoid ON, Torus OFF
Red:      Solenoid OFF, Torus ON

All LC plots have areas from about April 24 - April 25, 2019 where the readings went to 555 lbsf that can be disregarded. This period was when the LV cRIO froze and stopped communicating with the PLC.

In general, the LCs are stable. As expected, the biggest changes are seen when both magnets are ramped. This was also seen back in October 2018.

When the magnets were both tested in negative polarity on April 18, 2019, there does not appear to be any difference in LC readings.

There are two LCs (RS86103DS_BR_T and Z86108US_BL_B) that have read zero lbsf since my last email in October 2018. Have these LCs been verified to be working correctly?

Best regards,
Tyler
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