Unique Broadband Systems Ltd. DRU2KW User Manual

Manual No. x75mk3-11

x75-man-Rev11-0815.indd

Gravitas X75 is an ultra-compact, integrated DC power system. The base system is a 1RU 

shelf holding up to three hot-swap rectifier modules. This system produces up to 1950 watts 

output at -54.4, +27.2 or +13.6VDC. It can also be operated as a 2+1 redundant system with 

up to 1300 watts output. The expanded system consists of a base shelf plus an expander 

shelf with a 2RU total height. This system holds up to six rectifier modules with up to 3900 

watts output; it can be operated as a 5+1 redundant system with up to 3250 watts output. 

Each rectifier module is cooled by a fan that operates at a speed which is a function of load 

and temperature.

There are up to five circuit-breaker protected DC outputs or up to 10 GMT fuse protected 

outputs on the base system. A battery string breaker and a low-voltage battery disconnect 

are standard features. The expander shelf comes with a ribbon cable and connectors to link 

the signals between the two units at their rear panels. It also comes with bus bar links to 

parallel the rectifier output bus bars.

The base and expander shelves can also be operated as a battery backup, single feed power 

system (without load circuit breakers or fuses).

The remote access controller has LED visual indicators and Form C relay alarms. It is 

programmed by means of a remote PC web page display with communication by Ethernet 

LAN. Temperature compensated rectifier output is provided by means of an accessory TC 

probe. The X75 can be quickly installed by a qualified technician.

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