Difference between revisions of "Solenoid Controls Redesign"
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* Wiring | * Wiring | ||
+ | ** add new equipment | ||
** document trip chains | ** document trip chains | ||
** label circuit breakers | ** label circuit breakers | ||
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* NI fast DAQ | * NI fast DAQ | ||
− | ** purchase | + | ** test new module |
− | ** | + | ** purchase three more modules |
+ | ** connect to PLC, EPICS | ||
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+ | * 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 | ||
+ | ** add new channels, modify old ones according to latest channel assignments | ||
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** create tag lists | ** create tag lists | ||
** security? | ** security? | ||
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Revision as of 09:58, 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
- add new equipment
- 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
- implement system to isolate fault detectors and determine time sequence of trips
- NI fast DAQ
- test new module
- purchase three more modules
- connect to PLC, EPICS
- 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
- add new channels, modify old ones according to latest channel assignments
- A-B HMI improvements
- fault sequence screens
- Viewpoint
- get screens on the web
- security?
- EWEB
- create tag lists
- security?
- 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