Problems with UPS racks last week ...
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Problems with UPS racks last week ...
During the DSS tests on the weekend Jun 1-2 all racks connected to „interruptable“ UPS were cut by DSS at some point.
After the conclusion of the tests, 4 racks failed to be able to switch on under remote control: Traced to failure of the motor acting on the breaker in the switchboard
• Y0314A1 (MDT Can PSUs)• Y0514A1 (Endcap alignment)• Y0705S2• Y2705S2
For USA15 problem was solved with replacing the failed motors.More difficulties in US15:
• Y0705S2 tripped on trying to switch back on, traced to bad first installation of the replacement motor, Solved.
• Y2705S2 was found with 1 phase showing an instable voltage, finally traced on Thur afternoon to a loose connection on the switchboard. Resolved.
48V Service CSC, MDT, RPC, TGC
Note: Except for Y0514A1, DSS actions on the listed racks have been very rare, for US15 UPS eg last in June 2012
Appears no further tests needed for the moment ....
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Consolidation of Electrical Distribution for Big Wheel Racks (A + C)
• During 2011 running it was found that MDT mini-racks on BW A and C are not properly monitored electrically.
• They are daisy chained in a „wild“ fashion on random TGC racks electrically (with non halogen-free cables)
Scheduled to rectify in LS1
• Plan established by Wieslaw, Sergei and TC to install 4 new electrical lines per side, to connect MDT mini-racks with separate breakers on the EXD107/EXD209 switchboard as for all other racks
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Consolidation of Electrical Distribution for Big Wheel Racks (A + C)
• Breaker installation will imply cutting power for 1 or 2 days per side for the full big wheel
• Sergei informed us the work can be done in June/July
Do we have major constraints from our side ?
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Rack Turbine Replacement campaign, USA15 + US15 + UX15
There has been no progress from electrical team to propose a time slot for the turbine replacement campaign.We have now been asked by OPM to go the opposite way and define a time period suitable for us instead
Replacement campaign can be split into
• USA15 racks, quick, few days)• US15 – 1 CSC rack only, anytime• Cavern, racks on HS and HO • Racks on Big Wheel -- major operation
During campaign in UX the detector has to be off !!
• Should insist on a validation of monitoring mapping after the work, we rely on it for interlocks
Several weeks ?
Suggestions and Ideas on When to Do it ?