Eaton 9155 UPS (8–15 kVA) User's Guide 164201553 Rev G (www.eaton.com/powerquality) 1Chapter 1 IntroductionThe Eaton® 9155 is a double‐conversion, split-phase, online uninterruptible powersystem (UPS) for protecting computer systems and other intelligent devices. It is idealfor protecting essential information technology and electrical engineeringinfrastructure in corporate, telecom, health care, banking, and industrial applications.The UPS provides a steady, well‐regulated power supply for your computing andcommunications equipment, while protecting it from the frequent irregularities thatare inherent in commercially available power. Voltage spikes, power surges,brownouts, and power failures have the potential to corrupt critical data, destroyunsaved work sessions, and in some instances, damage expensive hardware.With the Eaton 9155, you can safely eliminate the effects of electrical linedisturbances and guard the integrity of your systems and equipment. Figure 1 showsthe Eaton 9155 UPS and an optional Extended Battery Module (EBM).Figure 1. The Eaton 9155 UPS and EBM (2-High Cabinets Shown)Providing outstanding performance and reliability, the Eaton 9155's unique benefitsincluding the following: Online UPS design with pure sine wave output. The UPS filters and regulatesincoming AC power and provides consistent power to your equipment withoutdraining the battery. More wattage in less space with a 0.9 power factor—protecting more equipmentand leaving more room for expansion. Support for Powerware Hot Sync® paralleling of multiple modules for redundancyor extra capacity. Input current total harmonic distortion (THD) of less than five percent, using activeinput power factor correction. ABM® technology that uses advanced battery management to increase batteryservice life, optimize recharge time, and provide a warning before the end of usefulbattery life.