[dsg-svt] FYI: pending SVT support work requests to the DSG

[Yuri Gotra]

Regarding points 3, 5, and 7, most of the day today the hall was in 
restricted access. There was a good opportunity to fix the reported 
issues before the RG-A starts.


On 2/5/18 3:43 PM, Peter Bonneau wrote:
>
> See attached DSG response.
>
>
>
> On 2/3/2018 10:34 AM, Yuri Gotra wrote:
>> The CLAS engineering run is ending in 2 days. We are approaching the 
>> start of physics data taking.
>> Here is the list of SVT support work requested from the DSG which is 
>> still pending.
>>
>> - Implementing the SVT hardware safety interlocks control interface 
>> in CSS, the chosen CLAS environment for slow controls and monitoring. 
>> The current LabView version of the interface requires a dedicated MS 
>> Windows pc to check the status, monitoring the system state, and 
>> resetting the latched interlocks. This pc is not on the CUE 
>> management system and requires manual installation of security 
>> patches and system updates.
>> - Implementing the hardware interlock alarm logging. Lack of logging 
>> features limits debugging options of the primary reasons for 
>> interlock actions and delays resolving the alarm incidents.
>> - Broken hardware interlock on ambient temperature T2. This interlock 
>> had to be disabled, a detector safety issue.
>> - Failing reading of the inlet coolant temperature in the hardware 
>> interlock. This problem requires correct conversion of the raw sensor 
>> data at negative temperatures to be implemented. This interlock had 
>> to be disabled, a detector safety issue.
>> - Failing reading of the outlet coolant flow meter. An attempt to fix 
>> it was made, the reading is still incorrect. This reading provides 
>> data to the SVT software and hardware interlocks, a detector safety 
>> issue.
>> - Installing the leak detection system. The leak sensor is connected 
>> to the hardware interlock but is not yet monitoring the tube 
>> connected to the drain pan, a detector safety issue.
>> - Fixing bad connection of the hybrid temperature reading for R3S11B. 
>> Several attempts to fix unreliable contact have been made, the 
>> reading is still bad. The corresponding module PS interlock had to be 
>> disabled, a module safety issue.
>> - Installing the nitrogen cooling line temperature monitoring. The 
>> temperature sensor has been ordered.
>>
>> A new request. Anova A40 chiller has issues related to operating at 
>> negative temperatures and was removed from the hall this week. This 
>> chiller is being tested by the engineering group. The SVT is using 
>> one of the Lauda chillers connected to the cold plate. This chiller 
>> has a history of blowing the fuses when it was operated in the EEL 
>> building. The spare Lauda chiller has 208 V plug. In order to 
>> minimize the down time of the detector in case of failure of the main 
>> chiller, it is required to assemble a second relay box connected to 
>> the hardware interlock. The relay box currently in use was designed 
>> for 110 V outlet compatible with A40 and one of the Lauda chillers.
>>
>>
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>

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