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M. Zerlauth for the MP3-CCC shift crew. 0v1. Summary of the events during past weeks. Few additional issues discovered and solved by interventions done during the week Dominating issue is still with unexplained RQD/F trips in S12 and S78. RCO.A56B2 /RCD.A56B2.

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  1. M. Zerlauth for the MP3-CCC shift crew 0v1

  2. Summary of the events during past weeks • Few additional issues discovered and solved by interventions done during the week • Dominating issue is still with unexplained RQD/F trips in S12 and S78

  3. Machine Interlock Systems RCO.A56B2 /RCD.A56B2 • RCO.A56B2 (and consequently RCD.A56B2) tripped another 3 times during the week, total of 8 trips now in the past 2 weeks • Power supply module of RCO.A56B2 to be exchanged (indicating a trigger through over voltage (1st level) -> Thursday?

  4. Summary of the RQD/F events so far • During past days 4 yet unexplained trips on RQD/F circuits of sectors 12 and 78 were observed as shown in the summary below (completed by the two trips on Tue 30th of March due to the SPS main power supply)

  5. All 4 events have an (almost identical) event sequence, ie PIC receives a Quench/FastPA signal from QPS (event sequence in PIC is the typical signature of an event originating within QPS) RQD/F trip simultaneously (but for 1 event where the GPM is ‘faster’ than the RQD quench signal) RQD and RQF switches open simultaneously and typically 3-5 ms BEFORE the PIC records the quench signal, ie confirming that the QPS quench loop is broken (common QPS quench loop for RQD/F circuits!) No indication of changes in DischargeRequest Loop, thus trip must be internal to QPS (no other means of opening the switches from outside) No other QPS PM buffers (apart from global busbar for 2 events and nQPS buffers which are well after the initial trip and a result of switch OFF of circuits) – Trip of 2nd QPS board? ‘Typical’ event sequence

  6. The RQD/F.A12 ‘hump’ • Available data and event sequence seem to indicate triggers to origin within the QPS system, reason after loads of analysis however still unclear • In sector 12 (where we had 3 oo 4 trips), busbar detector is showing repetitive noise patterns, some peaks up to 1.1V/550ms • Further investigation with help of QPS experts needed as to the real origin of the trips…

  7. FIN Machine Interlock Systems

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