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LV status

LV status. Outline. Preventive maintenance Fan replacement Power supplies: Clogged cooling water circuit Water damage Next steps. 1) Preventive Maintenance: Fan replacement. CAEN: untouched Wiener LV PFC (6x)

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LV status

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  1. LV status Niels Tuning (1/9)

  2. Outline • Preventive maintenance • Fan replacement • Power supplies: • Clogged cooling water circuit • Water damage • Next steps Niels Tuning (2/9)

  3. 1) Preventive Maintenance: Fan replacement • CAEN: untouched • Wiener LV • PFC (6x) • 1 PFC (7196 0059) exploded (AC short) during the final check after preventive maintenance • Fan tray (1x) • Crate PS (1x) • Wiener Tell1 Racks • Fan tray (2x) • Crate PS (4x) • 1 Crate PS (7140 0023) not switch on • Retested, and seems ok • See logbook: • http://lblogbook.cern.ch/OT/3627 PFC Tell1 Rack PS LHCb week 24 Feb 2014 – LV - N. Tuning (3)

  4. 2) Power supplies: history • History (see Moritz’ talk LHCb week 9 Sep 2013): • Switched on LV for commissioning week in Sep 2013 • Dirty cooling circuit: (logbook 21 Oct 2013) LHCb week 24 Feb 2014 – LV - N. Tuning (4)

  5. 2) Power supplies: “verification” procedure • Water spill when checking cooling circuit • 3-SEP-2013: Unconnected cooling water for T1C and T2A • 4-SEP-2013: • A-side: T1A, T2A OK; T3A ERROR • C-side: T1C, T2C, T3C ERROR • JAN-2014: Unmounted all 6 • Being tested one at the time: • 17-OCT: T2C OK, with worries?? • 22-JAN: T1C OK • 30-JAN: T3C OK • 12-FEB: T1A OK • 21-FEB: T2A OK • To be done: T3A • To be done: Spare • Will order one extra spare PS LHCb week 24 Feb 2014 – LV - N. Tuning (5)

  6. 3) Next steps • Clogged cooling water circuit at Sep comm. week • Water spill damaged LV power supplies • Next: • Check carefully all 6 power supplies (long term, with load) • Buy extra spare • Replace water connectors (thanks Laurent Roy for help!) • Re-install power supplies • Test at next commissioning week (~17-MAR) LHCb week 24 Feb 2014 – LV - N. Tuning (6)

  7. Backup LHCb week 24 Feb 2014 – LV - N. Tuning (7)

  8. 1) Preventive Maintenance: Fan replacement Ken Wyllie, TB 26 feb 2013 • Wiener: our fans are under maintenance now • LV power supply (PFC) + fan trays • Tell1 crates fan trays • Total cost 6k CHF • CAEN: we wish not to touch Niels Tuning (8/9)

  9. Intermezzo: Fans in OT • CAEN HV (2 SY1527 Mainframes): We prefer not to touch the system • They have a lifetime of 20khours at 60 C.This corresponds to 2.3 years continuous operation at 60 C.Suppose operation at 30 C, the lifetime increases to(1.26)^3 x 2.3 = 4.6 years of continuous running. • Actual experience suggests lifetime is longer. • We think the risk of damage when taking apart the system is considerable. • We will try to remove dust during LS1. • Wiener LV: We wish to have the fans replaced • PFC units (6) • They have fans with a lifetime of 39khours at 40 C.This corresponds to 4.5 years continuous operation at 40 C (or 5.7 years at 30 C). • At the same time, we have the chance to check/replace suspicious capacitors. • This (simply) implies sliding out the PFC units, and does not form a big risk. • Fan-Tray • Lower priority, as they have longer lifetime 65 khours + easy to replace. • Crate-power-supply of the RCM-crate • Wiener TELL1: We wish to have the fan-tray replaced • Fan-trays • Lower priority, as they have longer lifetime 65 khours + easy to replace • Crate-power-supplies LHCb week 9 Dec 2013 – LV - N. Tuning (9)

  10. CAEN HV (SY1527) LHCb week 9 Dec 2013 – LV - N. Tuning (10)

  11. Wiener LV Front: Back: III. Crate Power Supply I. PFC (x6): II. Fan tray:

  12. Wiener TELL1 Front: Back: II. Crate power supplies I. Fan tray:

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