1.3 Theory of Operation

This high-performance, line-interactive, uninterruptible power source (UPS) provides clean, reli- able, AC power to computer systems and other electrical equipment — protecting them from power blackouts, brownouts, swells, sags, surges, and interference. It is designed to provide protec- tion for equipment that operates on 208 volts AC, as well as peripheral equipment requiring 120 volts AC.

The UPS requires single phase 208 volts AC input for proper operation. Typically, this is supplied by connecting the UPS to two phases of a three phase 208V delta or 120V wye service.

The primary output is single phase 208 volt AC. An auxiliary 400VA, (3.3 amps), 120 volt AC out- put is provided to receptacles on the rear panel by an internal isolation transformer with the out- put neutral grounded.

When the front panel display or the optional software report the amount of load, the load on the 120 VAC output is not reported separately, but it is included in the total load. This means that the 120 VAC load is accounted for when calculations are made to determine the amount of run time remaining.

Note: Any load on the 120 volt output reduces the maximum load that can be powered by the 208 volt output.

Note: The 120 VAC output is provided by an isolation transformer which adds resistance in se- ries with the equipment to be powered. As a result, the 120 VAC output variation due to load (expressed as a percentage of nominal output) will be greater than the 208V output it is powered from. This should not be a problem for most equipment that will be powered. See Section 12 for more information.

Normally, the UPS operates “on-line,” supplying power from the utility input to the load (work- station, server, or other device). The converter circuitry is used to maintain an optimal float charge level on the battery.

When the utility fails, the converter supplies AC power to the load and the disconnect switch opens. The loads operate normally until shut down or until the battery is exhausted. The UPS au- tomatically transfers the load back to utility power when the line voltage returns to normal.

The UPS also provides surge protection and EMI/RFI filtering, as well as Smart-Boost™and SmartTrim™, which correct high and low input voltage without drawing power from the battery. Output control uses the UPS’s remote interface to turn the load on or off, without disabling other UPS functions.

4

Page 5 Page 7
Page 6
Image 6
APC 3000XLT, 2200XLT, 1400XLT user manual Theory of Operation
Page 5 Page 7

3000XLT, 1400XLT, 2200XLT specifications

The APC (American Power Conversion) range of Uninterruptible Power Supplies (UPS) includes models such as the 2200XLT, 5000T, 1400XLT, and 3000T, each designed to meet different power protection needs in various environments. These models provide reliable backup power and surge protection, ensuring that electronic devices remain operational during utility power disruptions.

The APC 2200XLT is known for its robust performance and efficiency. This model features on-line double conversion technology, which guarantees that connected equipment receives pure sine wave power, crucial for sensitive electronics. With a power capacity of 2200 VA, the 2200XLT accommodates high-energy requirements, making it ideal for small to medium-sized businesses. The LCD display provides real-time status on power conditions, battery health, and load levels, ensuring users are always informed.

The APC 5000T, with a power capacity of 5000 VA, is designed for larger operations, providing substantial backup power for critical infrastructure. This model offers advanced features such as hot-swappable batteries, allowing maintenance without disrupting power to connected devices. The 5000T also includes PowerChute software, facilitating monitoring and management of UPS systems via a user-friendly interface. Its enhanced scalability means it can easily be expanded to meet growing power needs.

The APC 1400XLT is compact yet efficient, offering 1400 VA of power. It excels in providing reliable protection for desktop computers and workstations. Featuring Power Factor Correction (PFC), this model optimizes power delivery, resulting in increased energy savings. Its customizable alarm settings and easy-to-read LCD panel make it user-friendly, ensuring that even those with minimal technical expertise can operate it effectively.

Lastly, the APC 3000T serves as a versatile powerhouse for small to medium-sized data centers. Its 3000 VA capacity supports critical equipment, while redundant features enhance reliability. The unit is also equipped with a network management card for remote monitoring capabilities. The 3000T's ability to configure and manage multiple units in a parallel setup allows businesses to ensure that their power needs are met while maximizing uptime.

In summary, the APC 2200XLT, 5000T, 1400XLT, and 3000T UPS models offer a variety of features and technologies designed to ensure power availability and system reliability across various applications. These units emphasize security against power disturbances while providing a solid return on investment for organizations seeking to protect their critical electronic infrastructure.
Top Page Image Contents