Difference between revisions of "Solenoid Controls Redesign"
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− | * Recommendations from Director's Review | + | * Recommendations from Director's Review (Electrical System and Quench Protection) and Lehman Review |
** determine if cold diodes can increase quench detection | ** determine if cold diodes can increase quench detection | ||
** add fast DAQ system prior to testing first coil | ** add fast DAQ system prior to testing first coil | ||
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* Infrastructure | * Infrastructure | ||
− | ** get fourth rack, install temporary wheels, bolt to other three racks | + | ** get fourth rack, install temporary wheels, bolt to other three racks |
+ | ** install computer and other equipment | ||
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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 | ||
− | ** | + | ** update mechanical/electrical interface drawing |
− | + | ||
Line 30: | Line 30: | ||
** document trip chains | ** document trip chains | ||
** label circuit breakers | ** 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 | *** prototype use of SOE module and relays in controls test stand | ||
** improve voltage range and eliminate cross-talk on voltage tap channels | ** improve voltage range and eliminate cross-talk on voltage tap channels | ||
Line 36: | Line 36: | ||
*** 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 | ||
− | *** | + | *** 19 voltage taps, at least two connections/tap, sometimes three |
− | + | ||
* Danfysik power supply | * Danfysik power supply | ||
** use 435NBX to talk to power supply | ** use 435NBX to talk to power supply | ||
− | ** | + | ** implement dump resistor center-tap ground fault detector |
** lockbox for door key | ** lockbox for door key | ||
** lock/tag/try procedures for dump resistor | ** lock/tag/try procedures for dump resistor | ||
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* Quench detector | * Quench detector | ||
− | ** | + | ** need sub-coil inductances from Floyd/George |
− | ** do we need a second QD? second technology? do we need to design our own? | + | ** 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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− | * | + | * NI fast DAQ |
− | ** | + | ** purchase, implement |
− | ** connection to PLC | + | ** connection to PLC, EPICS |
− | + | ||
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* A-B PLC programming | * A-B PLC programming | ||
** consider existing program a prototype, rework for 15-20 year lifetime | ** consider existing program a prototype, rework for 15-20 year lifetime | ||
− | ** send Josh to A-B training | + | ** send Josh to A-B training |
− | ** custom ("add-on") instructions to simplify everything | + | ** use custom ("add-on") instructions to simplify everything |
** use function block, structured text and ladder logic as appropriate | ** use function block, structured text and ladder logic as appropriate | ||
Revision as of 12:44, 29 November 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
- 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
- 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
- 19 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
- do we need a second QD? second technology? do we need to design our own? use PLC?
- test imbalance range adjustment in lab
- 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
- 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
- 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