Niels Tuning (1/9)

LV status

Outline

1) Preventive maintenance Fan replacement

2) Power supplies: Clogged cooling water circuit

Water damage

3) Next steps

Niels Tuning (2/9)

1) Preventive Maintenance: Fan replacement

• CAEN: untouched

• Wiener LV– PFC (6x)

1 PFC (7196 0059) exploded (AC short) 1 PFC (7196 0059) exploded (AC short) during the final check after preventive during the final check after preventive maintenancemaintenance

– Fan tray (1x)

– Crate PS (1x)

• Wiener Tell1 Racks– Fan tray (2x)

– Crate PS (4x)

1 Crate PS (7140 0023) not switch on1 Crate PS (7140 0023) not switch on

Retested, and seems ok

See logbook:

http://lblogbook.cern.ch/OT/3627LHCb week 24 Feb 2014 – LV - N. Tuning (3)

PFC

Tell1 Rack PS

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)

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??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

LHCb week 24 Feb 2014 – LV - N. Tuning (5)

Will order one extra spare PS

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)

Backup

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

1) Preventive Maintenance: Fan replacement

• WienerWiener: our fans are under maintenance now– LV power supply (PFC) + fan trays

– Tell1 crates fan trays

– Total cost 6k CHF

• CAENCAEN: we wish not to touch

Niels Tuning (8/9)

Ken Wyllie, TB 26 feb 2013

Intermezzo: Fans in OT

1)1) CAEN HVCAEN HV (2 SY1527 Mainframes): We prefer not to touch the systema) 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.

b) Actual experience suggests lifetime is longer.

c) We think the risk of damage when taking apart the system is considerable.

d) We will try to remove dust during LS1.

2)2) Wiener LVWiener LV: We wish to have the fans replacedI.PFC units (6)

a) 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).

b) At the same time, we have the chance to check/replace suspicious capacitors.

c) This (simply) implies sliding out the PFC units, and does not form a big risk.

II.Fan-Traya) Lower priority, as they have longer lifetime 65 khours + easy to replace.

1)Crate-power-supply of the RCM-crate

3)3) Wiener TELL1Wiener TELL1: We wish to have the fan-tray replaceda)Fan-trays

• Lower priority, as they have longer lifetime 65 khours + easy to replace

1)Crate-power-supplies

LHCb week 9 Dec 2013 – LV - N. Tuning (9)

CAEN HV (SY1527)

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

Wiener LV

I. PFC (x6):I. PFC (x6):

II. Fan tray:II. Fan tray:

Front:Front: Back:Back:

III. Crate Power SupplyIII. Crate Power Supply

Wiener TELL1

I. Fan tray:I. Fan tray:

II. Crate power suppliesII. Crate power supplies

Front:Front: Back:Back: