Xsr-1850 Redundant Power System - Enterasys X-Pedition XSR-1850 Getting Started Manual

Cable, CompactFlash and Accessory Specifications

XSR-1850 Redundant Power System

The optional XSR-1850 Redundant Power System, as shown in
supplemental power source. This 50-watt, AC to DC power supply is a redundant unit which is
operated in parallel with the standard internal power supply, with which it shares power buses.
The power system requires no configuration - it begins operating when all cables are connected.
The power system utilizes a droop sharing scheme such that at greater than 50% of a full load,
plus or minus 10%, each supply delivers 50% of the required load for 5.1 volt output. Passive
current sharing proveds 50%, plus or minus 30%, of the system load required for +12 and -12 volt
outputs. It also features over-voltage, over-current, and short-circuit protection including a 250
volt minimum fuse.
Up to four power supplies can be installed in the 1U Passive Power Chassis, as shown in
Figure
attach XSRs and the power chassis, as well as a standard, 2-meter shielded power cord for the
chassis-to-wall outlet connection. Power supplies are hot swappable and are equipped with a
built-in fan which extends the unit's lifespan but are not essential for normal functionality.
Refer to
A-22
Figure A-27
A-28, which can be rack mounted. Two-foot long DC power harnesses are provided to
Figure A-28
Figure A-29 for chassis DC output pinout assignments.
XSR-1850 Redundant Power System
Passive Power Chassis (Fully Loaded)
Figure A-27, is an external,