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<div>We had another trip of the SVT on 10/15/2017 at 20:27.<br>
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<div>Analysis of the trip for the Hardware Interlock System showed
that low coolant flow was detected followed by the shutdown of
all low and high voltage. This is the correct response for the
interlock system. The interlock system can not stop coolant
flow. <br>
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<div>As shown in the attached EPICS Mya archive chart, a slow rise
in coolant temperature occurred after the trip. <br>
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<div>Peter<br>
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<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Peter Bonneau"
<a class="moz-txt-link-rfc2396E" href="mailto:bonneau@jlab.org"><bonneau@jlab.org></a><br>
<b>To: </b>"Yuri Gotra" <a class="moz-txt-link-rfc2396E" href="mailto:gotra@jlab.org"><gotra@jlab.org></a>,
<a class="moz-txt-link-abbreviated" href="mailto:dsg-svt@jlab.org">dsg-svt@jlab.org</a><br>
<b>Sent: </b>Friday, October 13, 2017 7:38:36 AM<br>
<b>Subject: </b>Re: SVT outinhibit<br>
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<div data-marker="__QUOTED_TEXT__">Yuri:<br>
<br>
I checked on the hardware interlock system system this morning
and it's <br>
running normally (no trips overnight).<br>
<br>
After a system trip and before resetting, we need screen
captures of the <br>
"Interlock Status and signal monitoring" and the "Raw data
monitoring" <br>
tabs of the Hardware Interlock Monitoring System user interface
for <br>
troubleshooting. We need to know which signal is causing the
tripping.<br>
<br>
The last time we had an issue like this (1/31/2017) , the
problem was <br>
caused by a loose connection to the external coolant system
monitoring <br>
electronics (Proteus Industries sensor and Florite 990x
Controller.)<br>
<br>
As mentioned back in January, we don't have spares for the
external <br>
coolant monitoring electronics. I recommend we purchase spares
for this <br>
system.<br>
<br>
Peter<br>
<br>
On 10/12/2017 8:31 PM, Yuri Gotra wrote:<br>
> Dear Peter,<br>
><br>
> We had another crate inhibit issue this evening. Software
interlocks <br>
> were ok, chiller running.<br>
><br>
> HV inhibit was red and all HV channel inhibits had errors.
HV and LV <br>
> ramped down.<br>
><br>
> On the screenshot you could see B_SVT_HV_R1:outinhibit
major <br>
> HIHI_alarm at 20:06.<br>
><br>
> Please let us know your suggestions on debugging this
issue. Thank you<br>
><br>
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