Difference between revisions of "Solenoid Controls Redesign"
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* Infrastructure | * Infrastructure | ||
− | + | ** 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 |
Line 31: | Line 30: | ||
** 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 | ||
− | *** | + | *** Cody will look into this |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
* Danfysik power supply | * Danfysik power supply | ||
− | ** | + | ** 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) |
− | + | ** do we need a second QD? second technology? do we eed to design our own? | |
− | ** do we need to design our own | + | ** 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 | ||
− | |||
** 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 | + | ** Use RTI 435NBX instead of Point I/O serial modules |
− | ** Replace shunt with | + | ** 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 | ||
Line 104: | Line 97: | ||
* UPS power | * 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 | ** 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?
- 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
- 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