Electricity + Control August 2019

POWER QUALITY, STANDBY + BACK-UP

UPS with integrated power supply and USB interface

Felix Schulte, Product Marketing, Phoenix Contact Power Supplies GmbH, Paderborn, Germany

Supplying critical dc loads safely, increasing system availability, confined spaces and tough ambient conditions – system designers and operators are faced with numerous challenges. New dc uninterruptible power supply models from the Trio Power series offer interesting solutions – combining a power supply unit, switching unit and battery charger in one device.

1. The typical modular structure of a UPS system has advantages and disadvantages. The all- in-one alternative offers particular space-saving advantages. Take Note! 1

to be buffered. To do this, a dedicated dc UPS is used which combines two functions: firstly, it acts as a switch which switches to the load supply provided by a connected energy storage device in the event of mains failure; secondly, the UPS contains a charge controller which recharges the connected energy storage device during mains operation and ensures that it is charged and ready. The third component is the energy storage device that is connected to the UPS.

The new dc UPS devices are available in different performance classes.

An uninterruptible power supply, or UPS, is used wherever mains fluctuations or mains failures may occur.The aim is to prevent the failure of production systems caused by short-term interruptions to the power supply. In the event of prolonged mains failure, the UPS should ensure that the system enters a safe state. In addition, uncontrolled crashes on control systems such as industrial PCs should be avoided in order to prevent data loss and other damage. Structure of a UPS system The UPS system for dc loads generally consists of at least three components. First, the existing ac mains voltage is converted into a 24 V dc voltage by a power supply unit. This voltage then needs

Classic modular structure: a dc UPS system consists of a power supply unit, UPS device, and energy storage. This makes it possible to distinguish between critical and non-critical loads, but takes up a lot of space.

Wiring effort and space required This proven, modular structure presents advantages as well as disadvantages. The biggest drawback is the extent of space it requires on the DIN rail. For example, a modern 24 V dc power supply unit with 5 A output power has an overall

20 Electricity + Control

AUGUST 2019