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ALICE Power Reorganization 12 March 2007 Operations Team Nicholas Fette Jimmy Paulos Robert Grogan

Proposed power system reorganization to eliminate hazards and improve reliability for sensitive equipment. Includes dirty/clean generator, UPS, AC charger, DC equalizer, isolator, and more. Migration plan ensures seamless transition without downtime.

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ALICE Power Reorganization 12 March 2007 Operations Team Nicholas Fette Jimmy Paulos Robert Grogan

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  1. ALICE Power Reorganization12 March 2007Operations TeamNicholas FetteJimmy PaulosRobert Grogan Motivation 14 hours autonomous ops, heavy loads High reliability demand for sensitive equipment Present system is “haphazard” and a hazard

  2. Overview: Proposed Power System Dirty Clean Generator Socket Transfer Switch 120VAC UPS AC Charger UPS DC 24VDC Equalizer Isolator - 12V + - 12V + Equalizer 12VDC 24/12 - 12V + - 12V + GND 12VDC

  3. Parts Details – more on wiki Breaker or fuse 2-wire cable 2 3-wire cable Generator Socket 3 inline connector 3 Transfer Switch 3 120VAC 3 Monitor Panel UPS N Charger UPS 24VDC Equalizer 2 Isolator - 12V + - 12V + Equalizer 12VDC 24/12 2 - 12V + - 12V + GND 12VDC 2

  4. Accumentrics UPS • Acumentrics Uninteruptible Power Supply • limited output powers Multiple units in parallel Input AC Output AC UPS Charger UPS UPS Output DC Input DC Inline Y-connector (2 UPS) or connector box (>1 UPS)

  5. Parts and Costs: Total > $20k

  6. Proposed Migration Plan, and I quote … • Remove left rear seat and install two UPS, battery charger, DC-DC converter, automatic switch and accompanying breakers there.  Mount the monitoring panel up front, and wire into the charger appropriately.Wire those elements to the extent possible without taking the current electrical system off line.  Alice will remain normally functional throughout this stage, electrically unaltered. • Take Alice AC power off line.  Hook up wall and generator to the new automatic switch/UPS system, and run all AC distribution from the new UPS.  Leave the old chargers and 12V battery bank intact -- the UPS will not get 24V input.  At the end of this stage Alice will be fully functional with upgraded AC, and DC systems will remain unaltered. • Migrate 24V systems onto the new UPS supply, and 12V systems onto the new UPS+down-converter supply.  This can be done piece by piece and so won't take Alice down. • Take remaining Alice DC infrastructure off line and rewire the batteries in 24V configuration with isolator and equalizers.  The UPS will now receive 24V battery backup.  The compressor will be transfered onto the equalizer system.  This completes the overhaul. Put AC hardware in vehicle.

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