ALOHA Cabled Observatory
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ALOHA Cabled Observatory
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User PowerLow Voltage Circuit Breakers:There are six low voltage user ports on the Observatory for local experiments located a few meters away from the Observatory. The Circuit Breaker boards control the maximum amount of current supplied to each user port. The board is constructed around a Vicor® 48V-48V, DC-DC converter. The Observatory operator has the ability to monitor and set the current trip level of each Circuit Breaker. A Rabbit® RCM3000 control module monitors the current draw from each of six low voltage user ports via a Hall Effect current sensor mounted on each Circuit Breaker board. The Vicor® 48V-48V, DC-DC converters: The Vicor® converters have a shutdown pin which is used to switch the user power port on. Unlike a hard switch, the Vicor® converter provides a smooth turn-on which minimizes transients on the system bus. A separate converter for each user also provides complete floating isolation between users and individually regulated power.
High Voltage Circuit Breakers:There are two high voltage user ports on the Observatory for remote experiments and moorings. Power is supplied by two Pico® 48V-200V DC-DC converters. The outputs are connected in series to supply the user with 400V at the user port. This high potential is designed to overcome the resistive losses of long cable runs, thus providing sufficient voltage at the remote experiment or mooring site. The High Voltage Circuit Breakers also use the Rabbit RCM3000 to monitor and control trip levels. The Pico® 48v-200v, DC-DC Converters:
Page Last Modified 08/10/2007 |
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