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

[Yuri Gotra]

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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