Difference between revisions of "Solenoid Controls Redesign"

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Line 5: Line 5:
 
** document trip chains
 
** document trip chains
 
** label circuit breakers
 
** label circuit breakers
 +
** use Sequence-Of-Events (SOE) module, need additional wiring and relays
 +
** cross-talk on voltage tap channels
 +
*** change connection scheme?
 +
*** change current limiting scheme?
 +
*** use local measurement and current-loop to bring it down?
 +
** extend voltage measurement range using attenuators on separate Dataforth/PLC channels
 +
** should we use high-bandwidth Dataforth modules?
 +
** should we monitor all relays?
  
  
Line 11: Line 19:
 
** do we want to go to Ethernet based control?
 
** do we want to go to Ethernet based control?
 
** choose ground fault detection mechanism
 
** choose ground fault detection mechanism
 +
** address committee concerns
 +
*** dual fast dump switches?
 +
*** other redundancies?
 +
*** UPS on control boards and contactor?
 +
** lockbox for key
 +
** lock/tag/try for dump resistor
 +
** procedures to check for dump resistor integrity and diode polarity
  
  
Line 16: Line 31:
 
* Quench detector
 
* Quench detector
 
** can we get a good balance?
 
** can we get a good balance?
−
** do we to design our own QD?
+
** need sub-coil inductances in proper order
 +
** do we need to design our own QD?
  
  
Line 23: Line 39:
 
** implement system to isolate fault detectors and determine time sequence of trips
 
** implement system to isolate fault detectors and determine time sequence of trips
 
** monitor circuit breakers
 
** monitor circuit breakers
 +
** implement RS232 connections to all devices (e.g. vacuum gauges)
  
  
Line 37: Line 54:
  
 
* A-B PLC program improvements
 
* A-B PLC program improvements
−
** custom instructions to simplify everything
+
** custom ("add-on") instructions to simplify everything
  
  
Line 54: Line 71:
 
** use just for back-door access
 
** use just for back-door access
 
** security?
 
** security?
 +
 +
 +
 +
* UPS power
 +
** to where? target?
 +
** downtime due to power loss is deciding factor
 +
  
  
  
 
'''Notes'''
 
'''Notes'''
−
* note that 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
−
* need travelers for coil installation.
+
−
* should we install a UPS on the Danfysik contactor and control boards?
+
−
* should we install a second contactor in the Danfysik power supply?
+
−
* 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?
+
−
* should we monitor all relays?
+
−
* what is the effect of B field on sensors/relays?  should some instrumentation be relocated?
+
−
* do we need new flow sensors, or should they be relocated?
+
−
* lock box for power supply key
+
−
* more ethernet power strips
+
−
* use custom ("add-on") instructions to simplify PLC code
+
−
* install permanent VME-based fast DAQ
+
−
* logarithmic or equivalent current and voltage measurements
+
−
* isolate coil taps
+
−
* sequence of events module
+
−
* attenuators on Dataforth modules
+
−
* check dump resistor and diode in checklist, interlocks
+
−
* backup in case dump resistor/diode broken
+
−
* dump at low current to check dump system in checkout list
+
−
* logarithmic amps on voltages to get full range
+
−
* manual check of resistor/diode connection and polarity
+
−
* improve checklists and test plan
+
−
* resistor/diode checks in maintenance OSP and/or operations OSP
+

Revision as of 14:11, 13 September 2011

To-do for solenoid controls redesign


  • Wiring
    • document trip chains
    • label circuit breakers
    • use Sequence-Of-Events (SOE) module, need additional wiring and relays
    • cross-talk on voltage tap channels
      • change connection scheme?
      • change current limiting scheme?
      • use local measurement and current-loop to bring it down?
    • extend voltage measurement range using attenuators on separate Dataforth/PLC channels
    • should we use high-bandwidth Dataforth modules?
    • should we monitor all relays?


  • Danfysik power supply
    • do we want to go to Ethernet based control?
    • choose ground fault detection mechanism
    • address committee concerns
      • dual fast dump switches?
      • other redundancies?
      • UPS on control boards and contactor?
    • lockbox for key
    • lock/tag/try for dump resistor
    • procedures to check for dump resistor integrity and diode polarity


  • Quench detector
    • can we get a good balance?
    • need sub-coil inductances in proper order
    • do we need to design our own QD?


  • Instrumentation
    • implement system to isolate fault detectors and determine time sequence of trips
    • monitor circuit breakers
    • implement RS232 connections to all devices (e.g. vacuum gauges)


  • VME-based fast DAQ
    • NI vs VME?


  • A-B HMI improvements
    • fault sequence screens


  • A-B PLC program improvements
    • custom ("add-on") instructions to simplify everything


  • EPICS
    • new channels


  • Viewpoint
    • test


  • EWEB
    • use just for back-door access
    • security?


  • UPS power
    • to where? target?
    • downtime due to power loss is deciding factor



Notes

  • max ramp rate in the hall is approximately 10V / 20H = 0.5 A/sec
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