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

[Peter Bonneau]

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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