Difference between revisions of "Solenoid Controls Redesign"

Revision as of 13:43, 18 October 2011

To-do for solenoid controls redesign

• Address committee concerns
  • dual fast dump switches?
  • other redundancies?
  • UPS on control boards and contactor?
  • 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?
    • have fast and slow requirements, high and low voltage threshold requirements
      • 10 kHz Dataforth modules? attenuators?
    • 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?
  • 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
  • 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.
  • Increase the shunt resistance by a large factor?

• 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
  • custom ("add-on") instructions to simplify everything

• EPICS
  • new channels

• UPS power
  • to where
    • solenoid controls racks
    • target?
  • downtime due to power loss is deciding factor

Notes

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