Note The system On and Stby switches handle low voltage signals only; the high- power circuits do not pass through these switches.

DC Source Site Requirements

The DC source site requirements are as follows:

Suitable for use in –48 Vdc ((classified SELV) nominal or –60 Vdc (classified TNV-2) nominal systems.

The supply source must be electrically isolated by double or reinforced insulation from any hazardous AC or DC source.

The DC source must be reliably connected to earth (that is, battery room positive bus is connected to the grounding electrode).

The DC source must be capable of providing up to 925W of continuous power per feed pair. The sum of all three feeds on one side will be less than 1500W for single-feed and 3000W for dual feed.

Overcurrent Protection Requirements

Overcurrent protection devices must be provided as part of each host equipment rack.

Circuit breakers meeting the requirements shown in TABLE 3-1must be fitted between the DC source and the Netra ft 1800.

TABLE 3-1Overcurrent Protection Requirements

Current rating

30A maximum

Voltage

Maximum 60 Vdc rated in –48 Vdc power systems

 

Maximum 75 Vdc rated in –60 Vdc power systems

Type

Fast trip

Protection

Double pole breaking (both grounded and ungrounded conductor

 

open on fault)

Contact gap

Minimum 3 mm

Nuisance tripping

Circuit breaker must not operate when presented with an inrush

 

current of 27 amps and a duration of 2.5 microseconds

Quantity

One per feed, up to 12 per system

 

 

44 Netra ft 1800 Installation Guide • February 1999

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Sun Microsystems 1800 manual DC Source Site Requirements, Overcurrent Protection Requirements

1800 specifications

Sun Microsystems, founded in 1982, unveiled an array of innovative products over the years, among which the Sun-1 workstation and later the Sun-1800 series were significant contributions to the technology landscape. Designed specifically for engineering, graphics, and computing tasks, the Sun-1800 series emerged during a period when workstations were essential for high-performance computing applications.

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In summary, the Sun Microsystems 1800 series stands out for its powerful SPARC architecture, impressive memory capacity, integrated networking, and robust graphic capabilities. These characteristics, combined with the reliability of the Solaris operating system, positioned the Sun-1800 as a favored choice among professionals in engineering and scientific fields, shaping the future of workstation computing.