Controls Meeting 15-Dec-2011

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  • Announcements
  • Minutes from previous meeting 1-Dec-2011
  • Report from Scot on cryo design/changes
  • Equipment orders - Mark
  • Solenoid_Controls_Redesign - Mark, Josh, Scot, Cody, Yi, Elliott
    • Danfysik quench detector
    • shunt replacement
    • UPS power to Danfysik
    • ground fault detector using dump resistor
    • redundant Danfysik contactor, quench detector, dump diodes?
    • need more NI fast daq modules, 8 chan/module
  • Experiment Control Supervisor - Vardan, Hovanes, Elliott
  • EPICS evaluation
    • archiver
    • alarm system
    • backup/restore
  • EPICS update - Nerses, Hovanes, Elliott
  • Controls test stand - Hovanes, Josh
    • 435NBX serial module
    • EPICS drivers and gui's
  • PLC programming, Viewpoint, licenses, etc. - Josh
    • high-priority tasks
    • add-on instructions -- ladder logic, function block, structured text
  • Elog - Elliott
  • Mantis task tracker
  • PyIRMIS or CLAS inventory database? - Hovanes, Elliott


9:30 AM Thurs 1-Dec-2011 CC F325


Next Meeting

After the holidays.


Present: Elliott W, Mark S, Cody D, Josh B, Hovanes E, Scot S.

Equipment Orders

Mark has a few items to order. He will not purchase rack bases since we inherited a large number of rack-mount power strips.

Solenoid Controls Redesign

  • Scot presented near-final controls designs and drawings covering PLC chassis and module layouts, the many new or modified channels, changed actuator functions, etc.
  • We will have a redundant He liquid level monitor based on differential pressure, no need for the proposed "idiot light" (carbon resistor) system.
  • Josh will basically rewrite the entire PLC controls program from scratch, using the existing version as an "example."
  • We likely need one more Lakeshore Temperature monitor for the flange temperature probes.
  • Elliott reported we're nearly done with understanding and determining modifications needed for the quench detector.
  • Mark noted that Class 1 systems require less than 5 mA so that 20k resistors will work for 100 V max. George needs to verify the max voltage during fast dumps and quenches.
  • Mark will order the shunt replacement when Yi verifies it meets fast DAQ requirements.
  • Mark will have a center tab welded to the dump resistor so he can use it for the ground fault detector.


  • Elliott reported plans to meet with Accelerator to explore many topics, including layering CSS/Databrowser on top of the MyA achive engine.
  • Hovanes will move on to alarm systems after the archiver.
  • Nerses continues to work on the JLab discriminator, next will be high and low voltage systems.

Test Stand

  • Josh verified the SOE plus relays works as expected.
  • Next he will check the 435NBX ethernet-to-serial gateway.


  • Elliott demonstrated the new Midas elogs for manuals, maintenance logging and procedures. Comments are welcome, and please start using them.
  • We still need to choose and operator elog.


Elliott reviewed recent progress reported in the Mantis system. More people need to start using this!