APC VS 50, VS 100 user manual Technical Description, Rectifier Management, System Management

5 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.

5.1. 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 (-54.5Vdc) 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 5.5 for controller functions.

5.2. 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’s Manual Page 20