Difference between revisions of "For the second coil"

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* '''Action Items'''
 
* '''Action Items'''
 +
 
** remove jumper box and cables and bring to F117 for rework - done
 
** remove jumper box and cables and bring to F117 for rework - done
 +
 
** remove current-limiting resistor boxes, 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
 
** minimize summed coil voltage readouts, do most sums in PLC
 
*** implement early-warning quench/overvoltage detection in PLC
 
*** implement early-warning quench/overvoltage detection in PLC
 +
 
** add separate readouts of splice and vapor-cooled lead voltages
 
** add separate readouts of splice and vapor-cooled lead voltages
 +
 
** combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller
 
** combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller
 +
 
** match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors
 
** match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors
 +
 +
** Danfysik power supply
 +
*** understand ramp-down mechanism
 +
** UPS on Danfysik boards and contactor
 
** measure fast dump resistors in power supply - done
 
** measure fast dump resistors in power supply - done
 +
 
** Danfysik quench detector
 
** Danfysik quench detector
−
*** match and balance all resistors
+
*** match and balance resistors
 
*** revert channels used for splice/leads to normal coil balance mode
 
*** revert channels used for splice/leads to normal coil balance mode
 
*** install test points for gain/offset tuning
 
*** install test points for gain/offset tuning
−
*** install pots for external balance
+
*** install pots for external balance if needed
−
*** '''it is not clear whether this device will work for coil 4'''
+
*** note that max ramp rate in the hall is 10V / 20H = 0.5 A/sec
 +
 
 
** read out voltage taps for quench detection and DAQ using separate resistor chain
 
** read out voltage taps for quench detection and DAQ using separate resistor chain
 
*** will not go to active isolation for the upcoming coil
 
*** will not go to active isolation for the upcoming coil
 
*** may need active isolation if passive isolation does not work
 
*** may need active isolation if passive isolation does not work
 
*** may implement active isolation in the hall
 
*** may implement active isolation in the hall
 +
 
** install voltage divider to extend voltage range of USB device readout
 
** install voltage divider to extend voltage range of USB device readout
 +
 
** rework Zener protection circuit on USB device
 
** rework Zener protection circuit on USB device
 +
 
** update wiring diagrams to "as built"
 
** update wiring diagrams to "as built"
 +
 
** get diagrams and spec sheets to Fernando
 
** get diagrams and spec sheets to Fernando
 +
 
** make more copies of full Danfysik power supply manual (get from Steve L)
 
** make more copies of full Danfysik power supply manual (get from Steve L)
−
** get Cody working on fixing the slow dump problem - done
+
 
 +
** fix slow dump - done
 
*** contact Steve L concerning spare Danfysik boards for testing slow dump circuits
 
*** contact Steve L concerning spare Danfysik boards for testing slow dump circuits
 
*** contact Danfysik concerning debug strategy
 
*** contact Danfysik concerning debug strategy
 +
 
** understand signal clipping and interaction between readout modules, test and replace if necessary
 
** understand signal clipping and interaction between readout modules, test and replace if necessary
 +
 +
** automated elog entries
 +
 +
** A-B HMI improvements
 +
*** additional HMI license, get second computer working
 +
*** dual-redundant HMI server or another machine for the server
 +
*** HMI development machine and license
 +
*** contact A-B salesman about licenses
 +
*** change HMI database
 +
*** more pre-defined trend plots
 +
*** more HMI screens (may need license upgrade)
 +
*** simplify existing screens
 +
 +
** A-B PLC program improvements
 +
*** simplify many operations
 +
*** improve PLC early problem detection
 +
*** improve PLC cryo control under varying CTF operating conditions
 +
 +
** improve cryo system
 +
*** minimize ice buildup
 +
*** more heating/insulation on N2 vent line
 +
*** do we need cold traps?
 +
*** do we need additional valves, check valves, bypasses, whatever?
 +
*** can we calibrate the C-glass sensors somehow?
 +
  
  
Line 39: Line 83:
 
*** will we open up coils 3 and 4?
 
*** will we open up coils 3 and 4?
 
** what might we consider doing differently in the hall?
 
** what might we consider doing differently in the hall?
−
** 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?
 
** do we want an independent review of our fast (and slow) dump strategy and system?
 
** have we documented our experience?
 
** have we documented our experience?
−
 
+
** sub-coil inductances
−
 
+
−
 
+
−
'''(needs to be organized into priority order)'''
+
−
* Puzzles and problems to be addressed before next coil test
+
−
** improve cryo system
+
−
*** minimize ice buildup
+
−
*** more heating/insulation on N2 vent line
+
−
*** do we need cold traps?
+
−
*** do we need additional valves, check valves, bypasses, whatever?
+
−
*** can we calibrate the C-glass sensors somehow?
+
−
** field polarity reversed
+
−
** sub-coil inductances appear to be backwards
+
 
*** measure with inductance meter on the platform
 
*** measure with inductance meter on the platform
−
** inductance seen on splices
+
*** inductance seen on splices
−
** USB device wiring problems
+
** USB and other device wiring problems
−
** other wiring, cable and connector problems
+
*** noise
 
*** better indication of what caused fast/slow dumps -- either LED Panel or bits to the PLC
 
*** better indication of what caused fast/slow dumps -- either LED Panel or bits to the PLC
−
** total coil inductance disagreement
 
−
** use matched current-limiting resistors
 
−
** dynamic range adjustments
 
−
** noise elimination
 
−
** slow dump doesn't work
 
−
** understand fast dump circuit
 
−
*** measure fast dump resistances
 
−
** understand Danfysik ramp-down mechanism
 
−
** vapor-cooled lead blockage
 
−
*** can anything be done to avoid another one?
 
−
*** cold traps to prevent blockage?
 
−
*** heaters to melt blockage?
 
−
** improve ability to adjust quench detector
 
−
*** bring test points to front panel
 
−
*** use matched resistors
 
−
*** will quench detector work for coil 4?
 
−
*** note that max ramp rate in the hall is 10V / 20H = 0.5 A/sec
 
−
** use new sensor for vapor-cooled lead voltage drop
 
−
** isolation and current-loop readout for critical signals
 
−
*** interaction via Zener and Dataforth clipping
 
−
** UPS on Danfysik boards and contactor
 
−
** improve PLC cryo and MPS algorithms (in preparation for non-expert use)
 
−
*** simplify many operations
 
−
** improve PLC early problem detection
 
−
** improve PLC cryo control under varying CTF operating conditions
 
−
** add more HMI screens (may need license upgrade)
 
−
** simplify existing screens
 
−
*** relabel readouts
 
−
** additional HMI license, get second computer working
 
−
*** dual-redundant HMI server or another machine for the server
 
−
*** HMI development machine and license
 
−
*** contact A-B salesman about licenses
 
−
*** change HMI database
 
−
** more pre-defined trend plots
 
 
** did we ever implement guard shack notification?
 
** did we ever implement guard shack notification?
−
** automated elog entries
 
−
** update drawings and documentation
 
−
** where is manpower to make improvements?
 
−
** what else?
 

Revision as of 11:44, 19 January 2011

  • Action Items
    • 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
      • implement early-warning quench/overvoltage detection in PLC
    • add separate readouts of splice and vapor-cooled lead voltages
    • combine splice and lead into one hardware quench/overvoltage protection channel using Newport controller
    • match and balance all current-limiting resistors, go back to original 100k Ohm matched resistors
    • Danfysik power supply
      • understand ramp-down mechanism
    • UPS on Danfysik boards and contactor
    • measure fast dump resistors in power supply - done
    • Danfysik quench detector
      • match and balance resistors
      • revert channels used for splice/leads to normal coil balance mode
      • install test points for gain/offset tuning
      • install pots for external balance if needed
      • note that max ramp rate in the hall is 10V / 20H = 0.5 A/sec
    • read out voltage taps for quench detection and DAQ using separate resistor chain
      • will not go to active isolation for the upcoming coil
      • may need active isolation if passive isolation does not work
      • may implement active isolation in the hall
    • install voltage divider to extend voltage range of USB device readout
    • rework Zener protection circuit on USB device
    • update wiring diagrams to "as built"
    • get diagrams and spec sheets to Fernando
    • make more copies of full Danfysik power supply manual (get from Steve L)
    • fix slow dump - done
      • contact Steve L concerning spare Danfysik boards for testing slow dump circuits
      • contact Danfysik concerning debug strategy
    • understand signal clipping and interaction between readout modules, test and replace if necessary
    • automated elog entries
    • A-B HMI improvements
      • additional HMI license, get second computer working
      • dual-redundant HMI server or another machine for the server
      • HMI development machine and license
      • contact A-B salesman about licenses
      • change HMI database
      • more pre-defined trend plots
      • more HMI screens (may need license upgrade)
      • simplify existing screens
    • A-B PLC program improvements
      • simplify many operations
      • improve PLC early problem detection
      • improve PLC cryo control under varying CTF operating conditions
    • improve cryo system
      • minimize ice buildup
      • more heating/insulation on N2 vent line
      • do we need cold traps?
      • do we need additional valves, check valves, bypasses, whatever?
      • can we calibrate the C-glass sensors somehow?



  • Basic questions
    • what is causing blockage in vapor-cooled lead?
      • broken valve!
    • lag between field and current...are there turn-to-turn shorts in coil 1?
      • maybe short, maybe eddy currents
    • what worked, what didn't for coil 1?
    • what should we do differently for the next coil?
      • will we open up coils 3 and 4?
    • what might we consider doing differently in the hall?
    • do we want an independent review of our fast (and slow) dump strategy and system?
    • have we documented our experience?
    • sub-coil inductances
      • measure with inductance meter on the platform
      • inductance seen on splices
    • USB and other device wiring problems
      • noise
      • better indication of what caused fast/slow dumps -- either LED Panel or bits to the PLC
    • did we ever implement guard shack notification?
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