[Dsg-ft] Chiller temperature problem

[Amanda Hoebel]

Hi Raffaella, 

The following are responses to your questions:

1. The temperature set point was always at 6 degrees C. When the temperature spikes occurred, the setpoint did not change. The chiller was connected to the detector and flowing liquid, however once the increase or decrease in temperature occurred, we immediately disabled the interlocks to bring the temperature of the liquid inside of the chiller back to 6 degrees C.
2. As Brian mentioned, this is the only one available that we are aware.
3. We checked the connection to the analog card and also swapped the card to the second connector on the bus cable, neither of which solved the problem.

I have attached a presentation I gave during the DSG weekly meeting on the FT status. The presentation includes information on the chiller temperature problem and the tests that were done.

Regards,
Amanda

----- Original Message -----
From: "Brian Eng" <beng at jlab.org>
To: "raffaella devita" <Raffaella.Devita at ge.infn.it>
Cc: "Amanda Hoebel" <amandah at jlab.org>, "dsg-ft" <dsg-ft at jlab.org>, "Patrizia Rossi" <rossi at jlab.org>
Sent: Wednesday, August 9, 2017 12:26:55 PM
Subject: Re: [Dsg-ft] Chiller temperature problem

Hi Raffaella,

Correct, I installed the LRZ 912 module back in Nov 2016. This module was originally purchased for the Lauda chiller used by the SVT, but since the SVT is using an LRZ 913 (RS232 module) and its chiller only has a single slot the card was available for use by the FT.

This is the only available one that I'm aware of; we only bought one of these modules for the SVT as originally we weren't sure which module we were going to use.

> On Aug 9, 2017, at 11:50 AM, Raffaella De Vita <Raffaella.Devita at ge.infn.it> wrote:
> 
> - since the analog card was installed we believe by Brian some time ago (when we bought the chiller we did not get the analog interface), if there is another one available, would it be possible to try replacing it? is this a LRZ 912 module?
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Status of FT (08-09-17).pdf
Type: application/pdf
Size: 1401028 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_ft/attachments/20170809/71d921d3/attachment-0002.pdf>