Difference between revisions of "Solenoid Controls Redesign"
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− | ' | + | * 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 |
− | ** UPS on | + | ** add second quench detector (connected to second dump breaker) |
− | ** Failure Modes and Effects Analysis (FMEA) | + | ** 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) | ||
Revision as of 14:11, 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
- 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?
- EWEB
- 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
- to where
Notes
- max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec