Difference between revisions of "For the second coil"

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* Decisions from 21-Dec-2010 meeting
+
'''To-do list'''
−
** add separate readouts of splice and vapor-cooled lead voltages
+
−
** can combine splice and lead into one hardware quench/overvoltage protection channel
+
−
** revert Danfysik quench detector channels used for splice/leads to normal coil balance mode
+
−
** match and balance all current-limiting resistors
+
−
** match and balance resistors in Danfysik quench detector
+
−
** read out voltage taps for quench detection and DAQ using separate resistor chain
+
−
*** will not go to active isolation for the upcoming coil, may have to if this doesn't work
+
−
**
+
  
 +
* Wiring
 +
** remove jumper box and cables and bring to F117 for rework - '''done'''
 +
** remove current-limiting resistor boxes, bring to F117 for rework - '''done'''
 +
** minimize summed coil voltage readouts, do most sums in PLC - '''done'''
 +
** add separate readouts of splice and vapor-cooled lead voltages - '''done'''
 +
** combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller - '''done'''
 +
** match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors - '''done'''
 +
** read out voltage taps for quench detection and DAQ using separate resistor chain - '''done'''
 +
** update wiring diagrams to "as built" - '''done'''
 +
** get diagrams and spec sheets to Fernando - '''done'''
 +
** checkout, understand noise, signal clipping and interaction between modules
  
  
−
* Basic questions
+
* Danfysik power supply
−
** lag between field and current...are there turn-to-turn shorts in coil 1?
+
** understand ramp-down mechanism - '''done'''
−
** what worked, what didn't for coil 1?
+
** measure fast dump resistors in power supply - '''done'''
−
** what should we do differently for the next coil?
+
** eliminate 2V DC offset - '''done'''
−
*** what coil will we test next?
+
** fix slow dump - '''done'''
−
*** will we open up coil 4?
+
** make more copies of full Danfysik power supply manual (get from Steve L) - '''done'''
−
** what might we consider doing differently in the hall?
+
** implement ground fault detection compatible with quench detector
−
** prioritize into "must-haves", "should-haves" and "would-like-to-haves"
+
−
** do we want an independent review of our fast (and slow) dump strategy and system?
+
−
** have we documented our experience?
+
  
  
−
* Puzzles and problems to be addressed before next coil test
+
* Danfysik quench detector
−
** improve cryo system
+
** match and balance resistors - '''done'''
−
*** minimize ice buildup
+
** install test points for gain/offset tuning - '''done'''
−
*** more heating/insulation on N2 vent line
+
** install pots for balance - '''done'''
−
*** do we need cold traps?
+
** install bias circuit to account for Danfysik DC offset and common mode voltage - '''done'''
−
*** do we need additional valves, check valves, bypasses, whatever?
+
** checkout
−
*** can we calibrate the C-glass sensors somehow?
+
 
−
** field polarity reversed
+
 
−
** sub-coil inductances appear to be backwards
+
* Dataforth system
−
*** measure with inductance meter on the platform
+
** Correct for 2M Ohm internal impedance and 200k Ohm resistors in voltage tap readouts - '''done'''
−
** inductance seen on splices
+
** Correct for other internal resistances (vapor-cooled leads and splice)
−
** USB device wiring problems
+
 
−
** other wiring, cable and connector problems
+
 
−
*** better indication of what caused fast/slow dumps -- either LED Panel or bits to the PLC
+
* USB device
−
** total coil inductance disagreement
+
** install voltage dividers to extend voltage range - '''done'''
−
** use matched current-limiting resistors
+
** add resistors to Zener protection circuit - '''done'''
−
** dynamic range adjustments
+
** complete Zener/divider box and checkout
−
** noise elimination
+
 
−
** slow dump doesn't work
+
 
−
** understand fast dump circuit
+
* automated elog entries
−
*** measure fast dump resistances
+
** automatically dump screens to files - '''done'''
−
** understand Danfysik ramp-down mechanism
+
** create perl script - '''done'''
−
** vapor-cooled lead blockage
+
** create cron job - '''done'''
−
*** can anything be done to avoid another one?
+
 
−
*** cold traps to prevent blockage?
+
 
−
*** heaters to melt blockage?
+
* A-B HMI improvements
−
** improve ability to adjust quench detector
+
** get additional HMI client license from Steve - '''done'''
−
*** bring test points to front panel
+
** get second HMI computer working - '''done'''
−
*** use matched resistors
+
** implement A-B license server - '''done'''
−
*** will quench detector work for coil 4?
+
** get A-B IIS file server system working - '''done'''
−
*** note that max ramp rate in the hall is 10V / 20H = 0.5 A/sec
+
** change HMI database to MySql - '''done'''
−
** use new sensor for vapor-cooled lead voltage drop
+
** create more pre-defined trend plots - '''done'''
−
** isolation and current-loop readout for critical signals
+
** improve screen layouts - '''done'''
−
*** interaction via Zener and Dataforth clipping
+
** upgrade to 100 screen license
−
** UPS on Danfysik boards and contactor
+
 
−
** improve PLC cryo and MPS algorithms (in preparation for non-expert use)
+
 
−
*** simplify many operations
+
* A-B PLC program improvements
−
** improve PLC early problem detection
+
** new channels - '''done'''
−
** improve PLC cryo control under varying CTF operating conditions
+
** improve, simplify program - '''done'''
−
** add more HMI screens (may need license upgrade)
+
** try A-B alarm and logging systems - '''done'''
−
** simplify existing screens
+
** test PLC-based alarm system
−
*** relabel readouts
+
** use custom ("add-on") instructions to simplify code
−
** additional HMI license, get second computer working
+
 
−
*** dual-redundant HMI server or another machine for the server
+
 
−
*** HMI development machine and license
+
* EPICS
−
*** contact A-B salesman about licenses
+
** get list of all tags from osh - '''done'''
−
*** change HMI database
+
** serve out all PLC channels to CA
−
** more pre-defined trend plots
+
** implement guard shack notification for IOC hang/crash
−
** did we ever implement guard shack notification?
+
 
−
** automated elog entries
+
 
−
** update drawings and documentation
+
* EWEB screens
−
** where is manpower to make improvements?
+
** update for latest tags and drawings
−
** what else?
+
 
 +
 
 +
 
 +
 
 +
'''For the hall'''
 +
* note that max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec
 +
* should we install a UPS on the Danfysik contactor and control boards?
 +
* do we need additional valves, check valves, bypasses, whatever?
 +
* do we need Dataforth voltage attenuators on coil tap channels?
 +
* do we need active isolation of coil tap channels, etc?
 +
* should we monitor all circuit breakers?
 +
 
 +
 
 +
'''Basic questions'''
 +
* lag between field and current...are there turn-to-turn shorts in coil 1?
 +
** maybe short, maybe eddy currents...
 +
* will we open up coil 3 and/or coil 4?
 +
* do we want an independent review of our fast (and slow) dump strategy and system?
 +
* document our experience!

Latest revision as of 09:51, 24 February 2011

To-do list

  • Wiring
    • remove jumper box and cables and bring to F117 for rework - done
    • remove current-limiting resistor boxes, bring to F117 for rework - done
    • minimize summed coil voltage readouts, do most sums in PLC - done
    • add separate readouts of splice and vapor-cooled lead voltages - done
    • combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller - done
    • match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors - done
    • read out voltage taps for quench detection and DAQ using separate resistor chain - done
    • update wiring diagrams to "as built" - done
    • get diagrams and spec sheets to Fernando - done
    • checkout, understand noise, signal clipping and interaction between modules


  • Danfysik power supply
    • understand ramp-down mechanism - done
    • measure fast dump resistors in power supply - done
    • eliminate 2V DC offset - done
    • fix slow dump - done
    • make more copies of full Danfysik power supply manual (get from Steve L) - done
    • implement ground fault detection compatible with quench detector


  • Danfysik quench detector
    • match and balance resistors - done
    • install test points for gain/offset tuning - done
    • install pots for balance - done
    • install bias circuit to account for Danfysik DC offset and common mode voltage - done
    • checkout


  • Dataforth system
    • Correct for 2M Ohm internal impedance and 200k Ohm resistors in voltage tap readouts - done
    • Correct for other internal resistances (vapor-cooled leads and splice)


  • USB device
    • install voltage dividers to extend voltage range - done
    • add resistors to Zener protection circuit - done
    • complete Zener/divider box and checkout


  • automated elog entries
    • automatically dump screens to files - done
    • create perl script - done
    • create cron job - done


  • A-B HMI improvements
    • get additional HMI client license from Steve - done
    • get second HMI computer working - done
    • implement A-B license server - done
    • get A-B IIS file server system working - done
    • change HMI database to MySql - done
    • create more pre-defined trend plots - done
    • improve screen layouts - done
    • upgrade to 100 screen license


  • A-B PLC program improvements
    • new channels - done
    • improve, simplify program - done
    • try A-B alarm and logging systems - done
    • test PLC-based alarm system
    • use custom ("add-on") instructions to simplify code


  • EPICS
    • get list of all tags from osh - done
    • serve out all PLC channels to CA
    • implement guard shack notification for IOC hang/crash


  • EWEB screens
    • update for latest tags and drawings



For the hall

  • note that max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec
  • should we install a UPS on the Danfysik contactor and control boards?
  • do we need additional valves, check valves, bypasses, whatever?
  • do we need Dataforth voltage attenuators on coil tap channels?
  • do we need active isolation of coil tap channels, etc?
  • should we monitor all circuit breakers?


Basic questions

  • lag between field and current...are there turn-to-turn shorts in coil 1?
    • maybe short, maybe eddy currents...
  • will we open up coil 3 and/or coil 4?
  • do we want an independent review of our fast (and slow) dump strategy and system?
  • document our experience!
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