Mp3 list of main issues during 22 28 march 2010 mp3 team
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MP3 List of main Issues during 22-28 March 2010 MP3 - Team. Main issues on previous week. Main issues on previous week. RQX.R2. RQX.R2 tripped twice while at injection current (450A) No magnet quench at this low current

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Mp3 list of main issues during 22 28 march 2010 mp3 team

MP3 List of main Issues during 22-28 March 2010MP3 - Team




Rqx r2
RQX.R2

  • RQX.R2 tripped twice while at injection current (450A)

    • No magnet quench at this low current

    • Heaters fired in both events (21:46 and 01:32), without clear indication as to the source of the (QPS) trigger

    • No apparent fault of the power converter

MP3 Team


Ru l4
RU.L4

  • RU.L4 still show frequent trips during controlled ramp downs

    • Problem related to incorrect ramp rate solved (now 0.3A/s)

    • Seems zero-voltage crossing problem, as QPS threshold will be raised when <50A, propose to align ramp rate with RU.R4, ie 0.08A/s to delay zero voltage crossing into <50A region

MP3 Team


Rqtd rqtf
RQTD/RQTF

Resistance of 2 Ω in parallel on the circuit

  • Note for operators: 600A detectors must beproperly reset beforere-starting the machine

  • Frequentproblems due to teethingproblemswith tune feedback

    • Procedures and sequencefixedduring the week

MP3 Team


Rco a56b2 rof a45b2 it
RCO.A56B2 + ROF.A45B2 + IT

  • ROF.A45B2 tripped with afault which seems related to the AC contactor state contact -> might need an intervention to replace the power module (tbc by EPC)-> Currently not vital for beam operation

  • RCO.A56B2 and RCD.A56B2: 5th trip for RCO and 4th trip for RCD in 6 days. In all 5 events RCO goes first, all events seem triggered by U_RES jumping to 250 mV in a step function (needs detailed analysis with EPC and QPS) -> Currently not vital for beam operation

  • IT in general: Repetitive trips when switching them OFF or after Slow Power Aborts -> needs to be analysed by EPC, rather important as > pre-cycles

MP3 Team


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