Virgo Logbook

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Infrastructures (Electrical installation)

D'Andrea, Carbognani, Marano - 18:04 Monday 13 July 2026 (69340)

Technical Bulding 500 KVA diesel generator (GE 1)

Last week the motor of one of the 500 KVA diesel generator (GE 1) hosted in the Technical Building and serving the Central Building + Computing room on UPS and Central Building UTAs on IPS was identified as faulty.

Since it seems that motor repair could be lenghty the immediate solution being pursued at the moment is the renting of an emergency generator to be positioned in the vicinity of the TB that would replace the malfunctioning one and bringing back the standard situation.

This emergency generator has been already shipped onsite (See Fig. 1) and the electrical swap is currently foreseen for tomorrow, Tuesday June 14. The swap itself will not imply IPS interruptions but a test must be done on generator intervention so a ~30 sec ENEL interruption will be simulated.

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D'Andrea, Carbognani, Marano - 18:01 Tuesday 14 July 2026 (69351)

The swap to the emergency generator has been completed and a final test with a sequence ~30 sec ENEL interruption -> generator intervention -> ENEL back -> generator offload has been satisfactorily performed.

Electrical situation is then back to default one.

A longer term solution for having the 2nd generator (GE 2) being able to serve both "UPS Central Building + UPS Computing Room + IPS Central Building UTAs" and "IPS Central Building Chillers" is currently being planned (this solution is basically the first part of the generators parallelization that was already foreseen).