Kontron SBC-845D-VEA, Руководство пользователя

Страница: 26 / 131

xxvi
SBC-845D-VEA Single Board Computer User’s Guide
ä ä ä ä
Line Conditioner
Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners
keep a system’s AC power source voltage at a fairly constant level and, therefore, can handle
brownouts. Because of this added protection, line conditioners cost more than surge protectors.
However, line conditioners cannot protect against a complete loss of power.
ä ä ä ä
Uninterruptible Power Supply
Uninterruptible power supply (UPS) systems offer the most complete protection against
variations on power because they use battery power to keep the server running when AC power is
lost. The battery is charged by the AC power while it is available, so when AC power is lost, the
battery can provide power to the system for a limited amount of time, depending on the UPS
system.
UPS systems range in price from a few hundred dollars to several thousand dollars, with the more
expensive unit s allowing you to run larger systems for a longer period of time when AC power is
lost. UPS systems that provide only 5 minutes of battery power let you conduct an orderly
shutdown of the system, but are not intended to provide continued operation. Surge protectors
should be used with all UPS systems, and the UPS system should be Underwriters Laboratories
(UL) safety approved.