4 Technical Description

The Power System is designed to supply safe –54 Vdc primary power through the use of up to 10 rectifier modules. The controller will monitor all functions and provides battery management including controlled battery recharge with temperature compensation and low voltage disconnect. Integrated dc output distribution supports loads ranging from ¼ A all the way to 60 A. The controller can monitor up to 4 discrete external events with voltage free (“dry contact”) user inputs.

4.1.Rectifier Management

AC Input Power

The basic component of the power system is the rectifier module, which rectifies utility ac into nominal 48 Vdc. Each rectifier module requires 85 – 264 Vac, 47 – 63 Hz single phase power. Available cord sets include a variety of blade and twist lock plugs. Dedicated wiring inside conduit can also be used.

DC Output Power

The dc outputs of all the rectifiers in the system are connected to a common bus that is rated to carry the current of the entire system. The rectifier modules will equally share the entire load, independent of the controller. The rectifiers will continue to provide dc power (-54.5 Vdc) if the controller is removed or fails.

Rectifier alarms reporting

The rectifier has numerous sensors inside the unit that monitor fan fail, high temperature, high/low voltage, etc. These rectifier sensors trigger outputs that are monitored by the controller. In addition rectifier current is measured inside each rectifier. The controller can trigger output relays in the event of a rectifier alarm. Refer to Section 4.5 for controller functions.

4.2.System Management

System Voltage Monitor and Control

The controller monitors and adjusts the system voltage. It uses a voltage trim input to the rectifier to precisely control the dc output voltage. In the event of controller removal or failure, individual rectifiers will default to the analog voltage level (-54.5 Vdc) preset at the factory. System high and low voltage alarms are reported by the controller.

Magnum VS –48 Vdc User Manual

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American Power Conversion VS 50, VS 100 user manual Technical Description, Rectifier Management, System Management
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VS 50, VS 100 specifications

American Power Conversion (APC), a brand under Schneider Electric, is renowned for its uninterruptible power supplies (UPS) and provides a range of solutions for both commercial and personal use. Among their various product lines, the APC Smart-UPS 1000VA (VS 1000) and Smart-UPS 500VA (VS 500) stand out due to their features, technologies, and specifications tailored to different operational needs.

The APC Smart-UPS 1000VA is designed for advanced power protection, capable of supporting servers, network equipment, and more demanding applications. It features a pure sine wave output, which is critical for sensitive electronics, ensuring devices receive a stable and clean power source even during outages. The VS 1000 is equipped with an extensive battery backup, offering up to 9 minutes of runtime at full load.

A notable technology employed in the Smart-UPS 1000 is the Automatic Voltage Regulation (AVR), which maintains output voltage stability by adjusting boost and trim in situations of under or over voltage. The unit has an LCD interface, providing real-time data regarding load capacity, runtime, and battery health, enabling users to easily monitor and manage performance. Additionally, with its compact design, the VS 1000 can fit into various settings, maximizing space efficiency.

In contrast, the APC Smart-UPS 500VA targets smaller operations, offering a more compact solution for basic power protection needs. Like its larger counterpart, it also provides pure sine wave output, ensuring the safe operation of connected equipment. The VS 500 is designed for less intensive applications, making it suitable for desktop computers, network devices, and home office setups.

The 500VA model supports shorter runtimes, typically around 3 to 6 minutes under full load but is ideal for situations where downtime needs to be minimized. The Smart-UPS 500VA features similar Automatic Voltage Regulation technology, maintaining voltage stability under fluctuating conditions. However, it comes with a more straightforward LCD display, providing essential information on power status and battery levels without overwhelming the user.

In summary, the APC Smart-UPS 1000VA and 500VA cater to different user requirements, with the VS 1000 offering robust features for larger setups and the VS 500 serving as a versatile option for home or small office use. Both models integrate essential technologies such as pure sine wave output and AVR, showcasing APC’s commitment to high-quality power solutions. Whether for commercial or personal use, these units demonstrate APC's ability to provide reliable power protection tailored to diverse needs.
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