Pioneering solutions for total power protection

In today's 24/7 on demand world, mission-critical business systems must be available 100% of the time. Downtime cannot be tolerated, which is where an uninterrupted power supply can assist. At Uninterruptible Power Supplies Ltd, we pride ourselves on delivering industry-leading power protection solutions combined with service excellence to ensure systems are 'Always ON'.

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  • Data centres use huge amounts of electricity, with larger enterprises spending millions of pounds in energy every year. This reality, set against a background of rising energy costs and growing green legislation suggests that energy efficiency would be data centre operators’ top priority – but this is not in fact the case. While it is certainly a highly significant factor, it is overridden in most operators’ minds by concerns for availability – in today’s always-on world, a data centre cannot go offline.
    This means that operators do want to save energy and cut costs, providing they can do so without compromising availability. These twin goals apply to every aspect of the data centre, including the UPS installation. Fortunately modern modular topology allows UPSs to make their contribution to these goals. In this article Alan Luscombe, director at Uninterruptible Power Supplies Ltd., a Kohler company, looks at the technology and the possibilities it offers to data centre managers.
    Enterprises in most business sectors are generating a continued expansion in demand for data processing capacity. In the view of UK industry association the Data Centre Alliance (DCA), this is driving growth in the data centre industry. Another industry participant, Virtus Data Centres, has put figures to this – they see the UK data centre industry growing by 10% to 20% per annum, depending on market sector.
    This growing landscape is populated by data centres of many sizes and types. Most visible are the hyperscale types built specifically for major users such as Amazon, Facebook and Google. Less visible but more ubiquitous data centres range in size from large warehouses to installations covering a few hundred square feet in an office building. Data centres are also characterised by their ownership type – some are owned and operated by the enterprise that needs their data processing resource, while an increasing number is run by third party vendors providing colocation facilities for multiple tenants. Growth in colocation capacity is expected as client enterprises become more comfortable with entrusting their data resource to an external third party processor.
    One characteristic shared by all data centres, irrespective of their size or type, is their thirst for energy. According to a report by Bank of America Merrill Lynch, an average data centre is 40 times more energy-intensive than an equivalently-sized office building. This can translate into scenarios where energy represents up to 80% of a data centre’s running costs, as reported by the UK Government-owned UK Green Investment Bank.
    Taken together, these factors mean that enterprises of all sizes rely increasingly on data centres that create significant energy costs which they – and their customers – must ultimately absorb. Over time, these costs are likely to grow. Energy prices are on a continuing upward trend, while government legislation, shareholders and customers exert pressure to ‘go green’. These effects will be multiplied as the Internet of Things and Big Data drive the demand for data processing up.
    Against this background of large and rising costs, one would imagine that data centre managers and operators would consider reduction of energy costs and improved efficiency as one of their top priorities.

    What data centre operators actually want

    However this is not in fact the case. In a survey conducted by the Data Center Users’ Group, which is a collective of over 2,000 data centre, IT and facilities managers, the respondents ranked energy efficiency fourth in priority. Availability was the overall, overriding concern. This is partly due to the costs of a data centre outage, which can be huge and run into hundreds of thousands of pounds. However concerns about damage to the enterprise’s reputation are often even greater, and with good reason. A data centre failure that takes out a bank’s ATMs and denies customers access to their accounts is an event that can cause real problems for thousands of users and possibly make the national news headlines.
    That’s not to say that operators have no interest in energy saving or green branding. They’re certainly interested in achieving these objectives, but only if they can do so without putting their data centre’s availability at risk. Wouldn’t it be great if possibilities existed that allow energy savings to be made without threatening the facility’s availability?
    In fact, such possibilities do exist, and are currently implemented in many data centres. Part of the approach involves using sensors and software to monitor and modify the behaviour of a centre’s IT hardware, power and support equipment, and environmental control. Such strategies are complemented by the availability, efficiency and flexibility of the equipment they are working with. This applies not only to the ICT hardware itself, but also to the UPS and cooling equipment that supports it.
    As UPSs tend to be large-scale devices handling high power levels, their performance can have a significant impact on that of the entire data centre. Therefore, installing UPS systems that are efficient while also being highly available and flexible can make a significant contribution to meeting the twin demands of any data centre – high efficiency with uncompromised availability. Accordingly, we can look at the UPS topologies that allow these objectives to be realised.

    How modern UPS technology contributes to efficiency and availability goals

    One of the most important developments in recent years is the advent of transformerless UPS technology. Facilitated by advances in power semiconductors, it offers several key advantages over earlier transformer-based solutions. Efficiency is improved by up to 5% and remains consistent over the entire load spectrum. Power factor becomes closer to unity and independent of UPS loading, reducing the input current magnitude and allowing reductions regarding cabling and switchgear sizing and possibly reducing electricity costs. Input current harmonic distortion is also reduced.
    Fig.1: UPS AC-DC efficiency curves – transformerless v. transformer-based
    However, one of the main advantages is the huge reduction in size and weight that transformerless technology allows. The UPS footprint can be halved, while its weight reduces by about 75%. These reductions are so significant because they have facilitated the concept of modular UPSs and a completely new approach to UPS implementation. Instead of a large, single, inflexible floor-standing module, a UPS can be built up as one or more complete, self-contained modules in a 19” racking frame.
    This is demonstrated in UPS Ltd.’s PowerWAVE 9500DPA high power UPS. It can start as one frame containing a single 100 kW module; the frame can then be scaled vertically in 100 kW steps up to its 500 kW capacity. If preferred, the system can be run in redundant mode, supporting a load up to 400 kW in an N+1 redundant configuration. Horizontal scaling is also possible – this means that up to six frames can be paralleled to provide up to 3 MW power capacity.
    The modular design permits UPSs with very high power availability, particularly if they support ‘hot swapping’. A module is hot swappable if it can be inserted or removed from the host UPS frame without depriving the critical load of power or transferring it to the raw AC mains supply. Safe electrical disconnection and isolation without the risk of error-induced damage are also essential criteria. A faulty hot-swappable module can be immediately replaced by a new plug-in unit, so full UPS capacity is quickly restored – the mean time to repair (MTTR) is typically within half an hour of the module’s failure. The faulty module can be repaired off-line and returned to spares stock.
     By comparison, if a standalone UPS system fails, it must be isolated from the mains supply and repaired in situ rather than replaced, with fault finding and repair down to component level if necessary. This activity carries a MTTR of typically 6 hours. This difference in MTTR times clearly shows the advantage of using hot swap modular systems when high availability is a priority. Whereas a free-standing UPS system with redundancy could achieve 99.9995% (‘Five 9’s) availability, this figure improves to 99.9999% (‘6 Nine’s’) for a hot-swap modular redundant implementation.
    The significance of these figures has been highlighted in work performed by the Uptime Institute ( ). This has generated the term ‘5 Nines’ to express high availability. It also means that hot-swappable modular systems as in the above example that achieve 99.9999% availability are referred to as having ‘six nines’ availability.
    Fig. 2: A high power, fully modular, hot-swappable UPS system

    Fully modular, hot-swappable is the best solution

    In selecting a UPS system for high availability, it is important to ensure that the chosen solution is fully modular with hot-swappability. This is because some vendors offer systems referred to as ‘fault tolerant’ UPSs to provide lower-cost redundancy. Systems of this type have redundant components but not all of the major components are hot-swappable. Batteries and a subset of the power electronics typically are hot-swappable, but often a high number of critical components, such as the processor electronics, are not. Such designs offer high power availability because they continue to deliver protected power to the load if a component fails. However in this architecture the failure often means that the entire UPS has to be shut down for expensive and time-consuming repairs, causing system downtime and a major inconvenience for data centre managers.
    Modern, modular UPS systems offer the highest level of power protection available because all critical components, including batteries, are both redundant and hot swappable. Both planned downtime and unscheduled failure outages are eliminated, while the installation provides the highest levels of power availability for data centre critical loads.
    These modular UPS solutions bring commercial as well as electrical efficiency through their inherent flexibility and scalability. There is no need to future proof a data centre with high excess UPS capacity before it’s actually needed. Instead, a modular system can be efficiently configured to the existing load requirement, because modules can be added incrementally and easily when the load does grow – often with no interruption to power.


    In this article we have seen how modern, modular UPS systems can help data centre managers achieve the highest possible availability without sacrificing the highest possible levels of power efficiency. These non-exclusive benefits spring from the underlying transformerless technology, which has significantly improved UPS efficiency while ushering in the small, lightweight modules that allow hot-swappable, redundant UPS implementations with very high availability.

    Date: 10th September 2015

    Time: 4.00pm -  6.00pm (followed by Networking Event with drinks & food)

    Venue: The Castlefield Rooms, 18-20 Castle Street, Manchester M3 4LZ




    Join UPS Ltd & Yuasa Battery Sales (UK) to update your knowledge of UPS systems and batteries whilst gaining Continuous Professional Development (CPD) points. The free-to-attend seminar will be followed by a relaxed drinks event, acommpanied with a buffet, to enable you to network with other delegates.

    The seminar will cover the following topics:

    - UPS Evolution & Technologies

    - UPS Redundancy & Architectures

    - Selecting a UPS – Standalone or Modular?

    - Battery sizing

    - Factors affecting battery life




    4.00 pm


    4.15 pm

    UPS Presentation; Ensuring fail-safe power protection with today’s UPS technology - Mike Elms, Technical Manager, UPS Ltd

    5.00 pm

    Coffee break

    5.15 pm

    Battery installation, sizing and factors affecting service life - Peter Hollingworth, Technical Support Manager, Yuasa Battery Sales (UK)

    6.00 pm

    Networking & Drinks Event with Buffet




    Who should attend?

    - Electrical Engineers
    - Data Centre Managers
    - IT Managers
    - Project Managers
    - Operations Managers
    - Facilities & Estates Managers

    How to register:


    Click Here to register online
    Email us directly:
    Phone the marketing department on 01256 386700

  • Buyers of uninterruptible power supplies (UPSs) naturally take great care in checking their proposed purchase’s specifications and fitness for supporting their critical load. Parameters such as availability, energy efficiency, capacity and costs are essential and must be correct. However, some practical steps are also essential to ensure a successful installation and operation of the UPS.
    In this article Alan Luscombe, director at Uninterruptible Power Supplies Ltd., a Kohler company, takes a look at these steps - from selecting a suitable installation location to arranging ongoing maintenance.
    If your new data centre installation or upgrade calls for an uninterruptible power supply (UPS), then you will no doubt take great care in comparing any prospective UPS’s specifications and capabilities to the demands of the new data processing environment. Questions are: does the UPS offer the highest possible availability while being energy-efficient? Does it provide sufficient protection against all likely power anomalies, is it correctly sized for your installation and can it grow with your enterprise, while offering the best value for money?
    While these questions are perfectly valid and must be answered satisfactorily, there’s also a set of practical considerations essential to any UPS installation’s ultimate success. Adequate provision must be made for tasks ranging from identifying a suitable location to performing mechanical and electrical installation, as well as negotiating an on-going maintenance contract with the UPS supplier. Below are some ideas to consider when planning the practical aspects of a UPS installation.


    Choosing the location


    Choosing a suitable location is essential, although this has become easier as UPS systems have become smaller and lighter. The floor must support the UPS’s load, while the batteries must also be safely accommodated. Allowing sufficient space for any possible future expansion, as well as providing easy access for service and maintenance technicians is key. Conversely, unauthorised access must be prevented.
    The UPS and its local environment will mutually impact one another. The UPS must be adequately cooled and protected from excessive dust and humidity, while its effect on existing airflow and load on existing air conditioning equipment must be catered for. The installation site should avoid noise and heat issues for the user enterprise and its staff. In general, UPSs up to around 20 kVA can usually run in office environments, while larger sizes require a special-purpose, segregated area.
    Consideration is also needed for cable routing and entry, especially for medium to large UPSs. On solid floors, a cable trench or UPS plinth will be necessary to allow power cabling and termination under the UPS and battery. Specialised computer rooms typically have raised floors to accommodate data processing and communications equipment cabling and possibly cooling. However, these floors cannot usually bear the weight of UPS and battery equipment, which must instead be mounted on a steel plinth standing on the base floor. Adjustable plinth height allows accurate aligning of the UPS equipment with the suspended floor.


    Installation and commissioning

    Electrical installation of UPSs is a specialised task requiring qualified, experienced electrical staff, ideally from the UPS supplier or a recommended contractor. In either case, staff credentials should be checked and references taken from previous sites. The installation must always comply strictly with the supplier’s instructions as well as local and national installation regulations. Although these may vary, correct earthing is always essential for personnel safety and equipment protection. Larger, higher-powered UPSs also require careful consideration of the switchgear and cabling design.
    Considerable time and cost can be saved, by allowing for future business growth and addition of extra UPS modules. Modern, parallel free-standing UPS installation can be considerably eased by using an integrated switchgear and bus bar solution.

     UPSL installation for the Scottish government at the 2014 Commonwealth Games

    Once installed, the supplier’s trained and experienced staff should commission the UPS equipment. Commissioning covers a complete check of system facilities and options, establishing warranty cover, registering serial numbers, ensuring supplier acceptance of environmental conditions and providing UPS operations training for the user.


    Happily ever after

    UPS planning should include a service agreement with the supplier. This should cover emergency callout facilities with defined response times as failures are possible even in the best-maintained, most reliable equipment. A planned maintenance and testing regime is equally as important, which should include scheduled inspection and filter-changing on the UPS, together with regular battery checks. Battery impedance testing allows accurate prediction of life expectancy, while load bank testing reveals the battery capacity at time of test. In any case, batteries should be viewed as consumable items that will periodically need replacement and legal disposal.
    This article has shown some of the practical considerations that complement a UPS’s technical specifications and fitness for purpose. Planning must be made for its entire operational life, from establishing a suitable location, through mechanical and electrical installation to commissioning and on-going maintenance.

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