Power & Cooling
than 2.5%), high input power factor of 0.99 and a compact footprint with reduced weight.
Hampshire-based Redstation is one of the UK’s leading suppliers of domain registration services, and is one on the many data centre installations Riello UPS have been involved in. Alongside resilience, the energy efficiency of the UPS was one of the main factors in selecting a system from Riello. Redstation’s operations manager Kevin McCardle explains why he opted for the Master Plus:
“The 104 server racks are protected by four Riello Master Plus UPS, the latest in energy efficient UPS working in fully parallel-redundant configuration. A single mains feed enters the building from a dedicated substation to feed the four UPS. They then convert raw mains energy (AC) into the conditioned supply that the data centre loads requires. ‘Conditioned’ means that the UPS create a buffer between protected loads and harmful power outages such as sags, surges, brownouts and harmonics.
“All the UPS share the load equally, but if one fails through a fault condition or is taken out of service for maintenance, the other automatically takes over the load in a completely break-free supply.
“The servers remain totally unaware that there is a power problem or mains failure as it happens automatically. Riello’s Master Plus is designed specifically for data centre use and is one of the most robust UPS on the market. It uses on-line technology (VFI) with an isolation transformer on the inverter output.
“It has low total harmonic distortion (THDi) values, which means
February/March 2011
equipment upstream and downstream is shielded from harmonic pollution (a common cause of problems in electric circuitry) and results in greater efficiency. It also offers high online operating efficiency and high power factor to optimize usage of mains power.
“The UPS operate at 95-96% efficiency with a load attached of around 20-25%. We will only need four UPS when full loads occur.”
Other UPS system considerations
When considering a UPS system you need to consider the type and configuration of the system that suits your application as they all offer different levels of protection. You can choose from a centralised or decentralised system, or a modular or traditional parallel system (that can reduce redundant components and increase efficiency). When considering these options, you need to think about the impact of the type of control system, the battery system and how
the type of enclosure may affect the resilience of the system.
If you require expert advice and more information about any of Riello UPS’ products and services, go to
www.riello-ups.co.uk. Riello UPS is a leading European manufacturer of uninterruptible power supplies and standby power systems from 350VA to 6MVA. The company is part of the Riello Elettronica group and has support offices around the world.
The company provides a complete project management, installation and service package for its UPS, flywheels, generators, static transfer switches and inverters.
The Riello UPS team will be at Data Centre World at London Olympia from the 2-3rd March 2011. Join us at Stand E37 where Riello UPS representatives will be available to demonstrate and discuss the range of Riello UPS power protection systems ideal for the data centre environment.
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