<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body bgcolor="#ffffff" text="#000000">
From Chris Keith, info on the target control system:<br>
<br>
<br>
<br>
<br>
-------- Original Message --------
<table class="moz-email-headers-table" border="0" cellpadding="0"
cellspacing="0">
<tbody>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject: </th>
<td>Re: UPS power for Hall D target</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Tue, 07 Feb 2012 11:04:42 -0500</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Christopher Keith <a class="moz-txt-link-rfc2396E" href="mailto:ckeith@jlab.org"><ckeith@jlab.org></a></td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:wolin@jlab.org">wolin@jlab.org</a></td>
</tr>
</tbody>
</table>
<br>
<br>
<pre>The compressor for the cold heat is 19.5 A at 460 VAC. It's doubtful
that you will put that on a UPS. In the event of power loss, the target
will warm up. The recovery time will depend on how warm things get, but
we expect a cool-down time from room temperature of approximately 8
hours. Being able to monitor the controls (temperature and pressure)
will be convenient, although not absolutely necessary. The system is
designed so that the H2 gas will passively expand back into the storage
tank without the need to open any electrical or pneumatic valves.
The electronics for monitoring the system (besides the PLC crate) will
be minimal:
-- Temperature controller:
<a class="moz-txt-link-freetext" href="http://www.lakeshore.com/products/cryogenic-temperature-controllers/model-336/Pages/Overview.aspx">http://www.lakeshore.com/products/cryogenic-temperature-controllers/model-336/Pages/Overview.aspx</a>
Pressure monitor: We have been using strain gauge readout/controllers
built by Cuevas' group. I don't know the power usage, but it's not
high. Commercial units abound.
High Vacuum gauge for the scattering chamber:
<a class="moz-txt-link-freetext" href="http://www.mksinst.com/product/product.aspx?ProductID=455">http://www.mksinst.com/product/product.aspx?ProductID=455</a>
If I think of anything else, I'll let you know.
Hope this helps.
Chris
On 2/6/12 5:36 PM, Elliott Wolin wrote:
> Hi Chris,
>
> Giles Brown is collecting requirements for UPS power in Hall D. I
> recall you telling me a long time ago that you likely wouldn't need
> much, if any. But you also said you were considering putting some
> sort of compressor on a UPS, and that might need some power.
>
> What are your current thoughts on UPS power for the target control
> system?
>
> One of our criteria for supplying UPS power involves estimating
> recovery time in the absence of UPS power...if recovery takes a long
> time compared to general recovery after power loss then supplying UPS
> power makes sense.
>
> Of course if something risks getting damaged due to power loss then we
> would supply UPS power as a form of insurance.
>
> Thanks,
>
--
______________________________________________________________________
Christopher D. Keith
Jefferson Lab email: <a class="moz-txt-link-abbreviated" href="mailto:ckeith@jlab.org">ckeith@jlab.org</a>
12000 Jefferson Ave. ph: 757-269-5878
Newport News, VA 23606 fax: 757-269-5235
______________________________________________________________________
</pre>
<br>
<pre class="moz-signature" cols="72">--
Sincerely,
Elliott
================================================================================
Those raised in a morally relative or neutral environment will hold
no truths to be self-evident.
Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365
================================================================================
</pre>
</body>
</html>