| Publisher | Liebert | ||
|---|---|---|---|
| Format | 335.9KB PDF, requires Acrobat Rdr 5 | Date added | 01 Jul 2000 |
| Topics | UPS | ||
| Downloads | 98 | ||
“High-Availability” power systems require Reliability, Functionality, Maintainability, and Fault Tolerance. A few UPS configurations can overcome the “Last Four Hours” problem to achieve Continuous Availability of conditioned power. These configurations also greatly improve the power systems’ fault tolerance, as we shall see. First, the Bad News: All UPS equipment and switchgear, regardless of manufacturer, should be completely de-energized for preventive maintenance at least once per year. This maintenance generally requires between one and four hours of scheduled downtime per year, depending on system configuration. Preventive maintenance must be performed, and the resulting scheduled downtime limits the availability of the power system. Remember: Deferred maintenance is not the same as high availability.
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