Difference between revisions of "Solenoid Controls Redesign"

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* Recommendations from Director's Review (Electrical System and Quench Protection) and Lehman Review
 
* Recommendations from Director's Review (Electrical System and Quench Protection) and Lehman Review
 
** determine if cold diodes can increase quench detection - '''NO, Nov-2011'''
 
** determine if cold diodes can increase quench detection - '''NO, Nov-2011'''
−
** add fast DAQ system prior to testing first coil
+
** add fast DAQ system prior to testing first coil - '''Done'''
 
** add tests for internal shorts, shorts to ground and ground faults in coil and power supply to start-up sequence
 
** add tests for internal shorts, shorts to ground and ground faults in coil and power supply to start-up sequence
 
** add second dump circuit breaker
 
** add second dump circuit breaker
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* Cryo system
 
* Cryo system
−
** need specs, new channels, new functionality, etc. from Jonathan
+
** need specs, new channels, new functionality, etc. from Jonathan - '''Done Dec 2011'''
 
** update mechanical/electrical interface drawing
 
** update mechanical/electrical interface drawing
  
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* Quench detector
 
* Quench detector
 
** need sub-coil inductances from Floyd/George - '''Done Dec-2011'''
 
** need sub-coil inductances from Floyd/George - '''Done Dec-2011'''
 +
** modify QD for final configuration
 +
*** test imbalance range adjustment in lab
 
** do we need a second QD?  second technology?  do we need to design our own?  use PLC?
 
** do we need a second QD?  second technology?  do we need to design our own?  use PLC?
−
** test imbalance range adjustment in lab
 
  
  
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* Instrumentation
 
* Instrumentation
 
** implement system to isolate fault detectors and determine time sequence of trips
 
** implement system to isolate fault detectors and determine time sequence of trips
−
*** internal power supply faults?
+
*** internal power supply faults
 
** implement RS232 connections to all devices (e.g. vacuum gauges)
 
** implement RS232 connections to all devices (e.g. vacuum gauges)
 
** Use RTI 435NBX instead of Point I/O serial modules
 
** Use RTI 435NBX instead of Point I/O serial modules

Revision as of 09:52, 20 December 2011

To-do for solenoid controls redesign


  • Recommendations from Director's Review (Electrical System and Quench Protection) and Lehman Review
    • determine if cold diodes can increase quench detection - NO, Nov-2011
    • add fast DAQ system prior to testing first coil - Done
    • add tests for internal shorts, shorts to ground and ground faults in coil and power supply to start-up sequence
    • add second dump circuit breaker
    • add additional quench circuit diodes
    • add second quench detector (connected to second dump breaker)
    • add center tap to dump resistor and monitor ground current in the PLC
    • add UPS on dump breakers to avoid fast discharges
    • perform Failure Modes and Effects Analysis (FMEA)


  • Logbook research
    • check elog for all problems


  • Infrastructure
    • get fourth rack, install temporary wheels, bolt to other three racks
    • install computer and other equipment


  • Cryo system
    • need specs, new channels, new functionality, etc. from Jonathan - Done Dec 2011
    • update mechanical/electrical interface drawing


  • Wiring
    • document trip chains
    • label circuit breakers
    • implement Sequence-Of-Events (SOE) module, need additional wiring and relays
      • prototype use of SOE module and relays in controls test stand - Done Dec-2011
    • improve voltage range and eliminate 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
      • 17+ voltage taps, at least two connections/tap, sometimes three


  • Danfysik power supply
    • use 435NBX to talk to power supply
    • implement dump resistor center-tap ground fault detector
    • lockbox for door key
    • lock/tag/try procedures for dump resistor
    • procedures to check for dump resistor integrity and diode polarity prior to startup


  • Quench detector
    • need sub-coil inductances from Floyd/George - Done Dec-2011
    • modify QD for final configuration
      • test imbalance range adjustment in lab
    • do we need a second QD? second technology? do we need to design our own? use PLC?


  • Instrumentation
    • implement system to isolate fault detectors and determine time sequence of trips
      • internal power supply faults
    • implement RS232 connections to all devices (e.g. vacuum gauges)
    • Use RTI 435NBX instead of Point I/O serial modules
    • Replace shunt with flux-monitoring sensor


  • NI fast DAQ
    • purchase, implement
    • connection to PLC, 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 - Jan-2012
    • use custom ("add-on") instructions to simplify everything
    • use function block, structured text and ladder logic as appropriate


  • EPICS
    • new channels


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



Notes

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


Possible future improvements

  • monitor selected circuit breakers so operators can quickly find them when they trip
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