Difference between revisions of "Solenoid Controls Redesign"

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* Infrastructure
 
* Infrastructure
−
** what goes into fourth rack besides computer?
+
** get fourth rack, install temporary wheels, bolt to other three racks, install computer and other equipment
−
** get fourth rack, install temporary wheels, bolt to other three racks
+
  
  
  
 
* Cryo system
 
* Cryo system
−
** need specs, new channels, new functionality, etc.
+
** need specs, new channels, new functionality, etc. from Jonathan
  
  
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** use Sequence-Of-Events (SOE) module, need additional wiring and relays
 
** use Sequence-Of-Events (SOE) module, need additional wiring and relays
 
*** prototype use of SOE module and relays in controls test stand
 
*** prototype use of SOE module and relays in controls test stand
−
** cross-talk on voltage tap channels
+
** improve voltage range and eliminate cross-talk on voltage tap channels
 
*** change connection scheme?
 
*** change connection scheme?
 
*** change current limiting scheme?
 
*** change current limiting scheme?
 
*** requirements:  fast vs slow, high vs low voltage, high vs low precision
 
*** requirements:  fast vs slow, high vs low voltage, high vs low precision
−
**** 10 kHz Dataforth modules?  attenuators? isolation amplifiers?
+
*** Cody will look into this
−
*** 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
 
* Danfysik power supply
−
** do we want to go to Ethernet based control?  use 435NBX?
+
** use 435NBX to talk to power supply
 
** choose ground fault detection mechanism
 
** choose ground fault detection mechanism
−
** lockbox for key
+
** lockbox for door key  
−
** lock/tag/try for dump resistor
+
** lock/tag/try procedures for dump resistor
−
** procedures to check for dump resistor integrity and diode polarity
+
** procedures to check for dump resistor integrity and diode polarity prior to startup
  
  
  
 
* Quench detector
 
* Quench detector
−
** can we get a good balance?
+
** can we get a good balance...need sub-coil inductances from Floyd (Fall 2011)
−
** need sub-coil inductances in proper order - from Floyd Fall 2011
+
** do we need a second QD?  second technology?  do we eed to design our own?
−
** do we need to design our own QD?
+
** can we get an FPGA module with A/D inputs off the shelf to do this?
−
** can we get an FPGA module with A/D inputs off the shelf?
+
  
  
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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
−
** monitor circuit breakers?
 
 
** 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?  Need to get one and test.
+
** Use RTI 435NBX instead of Point I/O serial modules
−
** Replace shunt with different technology?  Add amplifier between shunt and fast daq?
+
** Replace shunt with flux-monitoring sensor
  
  
Line 95: Line 87:
 
** send Josh to A-B training?
 
** send Josh to A-B training?
 
** custom ("add-on") instructions to simplify everything
 
** custom ("add-on") instructions to simplify everything
 +
** use function block, structured text and ladder logic as appropriate
  
  
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* UPS power
 
* UPS power
−
** to where
+
** solenoid controls racks
−
*** solenoid controls racks
+
** Danfysik control circuits and contactor?
−
*** Danfysik control circuits and contactor?
+
** target? other cryo and vacuum systems?
−
*** target? other cryo and vacuum systems?
+
** cooling systems (dewpoint)?
 
** downtime due to power loss is deciding factor
 
** downtime due to power loss is deciding factor
  
Line 115: Line 108:
 
'''Notes'''
 
'''Notes'''
 
* max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec
 
* 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

Revision as of 14:26, 25 October 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
    • add fast DAQ system prior to testing first coil
    • 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)


  • 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


  • 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
    • 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
      • Cody will look into this


  • Danfysik power supply
    • use 435NBX to talk to power supply
    • choose ground fault detection mechanism
    • 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
    • can we get a good balance...need sub-coil inductances from Floyd (Fall 2011)
    • do we need a second QD? second technology? do we eed to design our own?
    • can we get an FPGA module with A/D inputs off the shelf to do this?


  • Instrumentation
    • implement system to isolate fault detectors and determine time sequence of trips
    • 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


  • 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
    • 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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