Difference between revisions of "Solenoid Controls Redesign"

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* Address committee concerns
 
* Address committee concerns
−
** dual fast dump switches?
+
** dual fast dump switches
−
** other redundancies?
+
** UPS on control boards and contactor - stand-alone or counting house UPS
−
** UPS on control boards and contactor?
+
** Failure Modes and Effects Analysis (FMEA)
−
** Failure Modes and Effects Analysis (FMEA) needs to be done
+
 
** what else?
 
** what else?
  
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*** change connection scheme?
 
*** change connection scheme?
 
*** change current limiting scheme?
 
*** change current limiting scheme?
−
*** have fast and slow requirements, high and low voltage threshold requirements
+
*** requirements:  fast vs slow, high vs low voltage, high vs low precision
−
**** 10 kHz Dataforth modules?  attenuators?
+
**** 10 kHz Dataforth modules?  attenuators? isolation amplifiers?
 
*** discuss with engineers
 
*** discuss with engineers
 
*** use local measurement and current-loop to bring it down?
 
*** use local measurement and current-loop to bring it down?
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* Danfysik power supply
 
* Danfysik power supply
−
** do we want to go to Ethernet based control?
+
** do we want to go to Ethernet based control?  use 435NBX?
 
** choose ground fault detection mechanism
 
** choose ground fault detection mechanism
 
** lockbox for key
 
** lockbox for key
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* Quench detector
 
* Quench detector
 
** can we get a good balance?
 
** can we get a good balance?
−
** need sub-coil inductances in proper order
+
** need sub-coil inductances in proper order - from Floyd Fall 2011
 
** do we need to design our own QD?
 
** do we need to design our own QD?
 
** can we get an FPGA module with A/D inputs off the shelf?
 
** can we get an FPGA module with A/D inputs off the shelf?
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*** get screens on the web
 
*** get screens on the web
 
*** security?
 
*** security?
 +
 +
 +
 
** EWEB
 
** EWEB
 
*** create tag lists
 
*** create tag lists
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* A-B PLC programming
 
* A-B PLC programming
 
** consider existing program a prototype, rework for 15-20 year lifetime
 
** consider existing program a prototype, rework for 15-20 year lifetime
 +
** send Josh to A-B training?
 
** custom ("add-on") instructions to simplify everything
 
** custom ("add-on") instructions to simplify everything
  
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** to where
 
** to where
 
*** solenoid controls racks
 
*** solenoid controls racks
−
*** target?
+
*** Danfysik control circuits and contactor?
 +
*** target? other cryo and vacuum systems?
 
** downtime due to power loss is deciding factor
 
** downtime due to power loss is deciding factor
  

Revision as of 08:53, 25 October 2011

To-do for solenoid controls redesign


  • Address committee concerns
    • dual fast dump switches
    • UPS on control boards and contactor - stand-alone or counting house UPS
    • Failure Modes and Effects Analysis (FMEA)
    • what else?


  • Infrastructure
    • what goes into fourth rack besides computer?
    • get fourth rack, install temporary wheels, bolt to other three racks


  • Cryo system
    • need specs, new channels, new functionality, etc.


  • Wiring
    • document trip chains
    • label circuit breakers
    • use Sequence-Of-Events (SOE) module, need additional wiring and relays
      • prototype use of SOE module and relays in controls test stand
    • cross-talk on voltage tap channels
      • change connection scheme?
      • change current limiting scheme?
      • requirements: fast vs slow, high vs low voltage, high vs low precision
        • 10 kHz Dataforth modules? attenuators? isolation amplifiers?
      • discuss with engineers
      • use local measurement and current-loop to bring it down?
    • extend voltage measurement range using attenuators on separate Dataforth/PLC channels
    • should we use high-bandwidth Dataforth modules?
    • should we monitor all relays? circuit breakers?


  • Danfysik power supply
    • do we want to go to Ethernet based control? use 435NBX?
    • choose ground fault detection mechanism
    • lockbox for key
    • lock/tag/try for dump resistor
    • procedures to check for dump resistor integrity and diode polarity


  • Quench detector
    • can we get a good balance?
    • need sub-coil inductances in proper order - from Floyd Fall 2011
    • do we need to design our own QD?
    • can we get an FPGA module with A/D inputs off the shelf?


  • Instrumentation
    • implement system to isolate fault detectors and determine time sequence of trips
    • monitor circuit breakers?
    • implement RS232 connections to all devices (e.g. vacuum gauges)
    • Use RTI 435NBX instead of Point I/O serial modules? Need to get one and test.
    • Replace shunt with different technology? Add amplifier between shunt and fast daq?


  • VME-based fast DAQ
    • NI vs VME?
    • connection to PLC?
    • connection to EPICS?


  • A-B HMI improvements
    • fault sequence screens
    • Viewpoint
      • get screens on the web
      • security?


    • EWEB
      • create tag lists
      • security?


  • A-B PLC programming
    • consider existing program a prototype, rework for 15-20 year lifetime
    • send Josh to A-B training?
    • custom ("add-on") instructions to simplify everything


  • EPICS
    • new channels


  • UPS power
    • to where
      • solenoid controls racks
      • Danfysik control circuits and contactor?
      • target? other cryo and vacuum systems?
    • downtime due to power loss is deciding factor



Notes

  • max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec
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