4.2Loadtransferswitch

The load transfer switch is actually an electro-dynamic relay which serves to rapidly transfer your computer equipment (load) from the utility to the UPS’s alternate power source in the event of a utility failure. When the utility is restored to within safe limits, the switch acts to re-transfer the load to the utility. The time required for the relay to transfer your load to either power source is much, much faster than that which is required by any modern computer or computer peripheral device.

4.3BatteryCharger

The UPS's battery charger converts the alternating current (AC) supplied by the utility to a direct current (DC) which is compatible with the battery. The charger maintains the battery at a constant voltage to ensure that the battery will have the capacity to support your load as often as possible. This charging method, known as “float” charging, provides maximum battery service life and minimal internal heating. The battery is charged whenever the UPS is plugged in, whether or not it is switched on.

4.4Battery

The UPS’s battery is an energy source much like the battery in an automobile. Also, like most automobile batteries, the UPS’s battery is a modern maintenance free lead-acid type; it is sealed and leakproof. The battery has a typical service life of 3 to 6 years. The service life is extended when the UPS is kept in a cool environment, below 30°C or 86°F.

4.5Inverter

The UPS must convert the battery’s energy into a form that your computer equipment can rely upon during a utility failure. This is the job of the UPS’s inverter. The UPS converts the battery’s DC to AC using solid state devices (transistors), controlled using a technique known technically as “pulse width modulation”. This technique is highly efficient which means that little battery power is wasted in the conversion process. Hence, your equipment can run for long periods from the UPS before the battery’s capacity is spent.

Page 15

Page 16 Page 18
Page 17
Image 17
American Power Conversion BK400EI, BK600EI, K250EI user manual 2Loadtransferswitch, 3BatteryCharger, 4Battery, 5Inverter
Page 16 Page 18

K250EI, BK400EI, BK600EI specifications

American Power Conversion (APC) is renowned for its innovative power management solutions, and its uninterruptible power supplies (UPS) are a testament to this commitment. Among their product lineup, the BK600EI, BK400EI, and K250EI models are popular choices designed to provide reliable power protection to various devices and systems.

The BK600EI is a 600VA UPS, ideal for protecting office equipment, personal computers, and networking devices. One of its standout features is the line-interactive technology, which provides voltage regulation during brownouts and surges. This model also supports an LCD display that offers real-time data on battery status, load capacity, and input voltage, enabling users to monitor their power environment easily. Additionally, the BK600EI has a compact design, making it suitable for space-limited areas.

Conversely, the BK400EI is a slightly lower-capacity model, rated at 400VA, making it an excellent option for smaller systems or devices with lower power requirements. Similar to the BK600EI, it employs line-interactive technology, ensuring continuous operation even during power fluctuations. This model is designed with automatic shutdown software that protects devices from data loss during power outages, a critical feature for businesses that rely on information stability and integrity.

The K250EI stands out with its 250VA capacity, catering to entry-level applications. This model is perfect for those needing basic power protection for devices such as routers, modems, or small desktop computers. The K250EI is designed with overload protection, ensuring that devices are safeguarded against electrical surges and overload conditions. The LED indicators provide a quick visual reference for the unit's operational status, reducing user effort in monitoring performance.

All three models share essential characteristics, such as a compact footprint, user-friendly interfaces, and advanced battery management technologies that improve longevity and efficiency. They also come equipped with multiple outlets to ensure users can connect various devices simultaneously. Furthermore, each model is engineered to minimize the environmental impact, boasting energy-efficient designs that contribute to reduced power consumption.

In conclusion, the APC BK600EI, BK400EI, and K250EI UPS models exemplify affordable and effective power management solutions. With their high-quality features, advanced technologies, and protective characteristics, they are well-suited for home offices, small businesses, or individual users seeking reliable power backup and protection.
Top Page Image Contents