Product Update -

This month we take a look at the Eaton 9140 Rackmount UPS which provides some of the best in class features to size and cost ratio on the market today.

If you are interested in a demonstration of the benefits of this product please call us on 0800 978 8988 to arrange your free demonstration.

The Eaton 9140 Rackmount UPS provides premium online backup power and scalable battery runtimes for medium- and high-density rack environments. Packing 10 kVA of power into only 6U, the 9140 UPS conserves valuable rack space. The 9140 significantly extends battery service life with ABM technology and prolongs runtimes with extended 3U battery modules.

Features and benefits, are as follows:

• Conserves valuable rack space with up to 10 kVA of power in only 6U of height, including batteries
• Significantly reduces installation time with pre-installed rackmount hardware
• Facilitates easy installation and reduces service time with modular, lightweight design
• Accommodates system growth with capacity upgrade availability from 7.5 to 10 kVA
• Increases battery service life and system uptime with ABM battery-charging technology and hot-swappable batteries
• Provides detailed information and UPS management in multiple languages via intuitive LCD interface

This double-conversion UPS resolves all nine common utility power problems and supplies clean, continuous power to all  connected equipment. If utility power goes out all together, there is no delay transferring to backup power, either to UPS batteries or an auxiliary generator.

Easily install and service your UPS The 9140 delivers high system availability—the key is an internal automatic bypass feature that allows the 9140 to continuously provide power to critical equipment while the system is serviced, even when the electronics are removed.

The 9140 also comes with user-replaceable battery and power modules. Both of these are easy for one person to switch out without disrupting power to protected equipment. If your computer room is dynamic and you find yourself frequently moving racks and other IT equipment, you may prefer a 9140
corded UPS, which is equipped with a standard IEC 309-60A cord with plug as input, which means you don’t need an electrician to install your UPS with each move.

Expanding UPS management capabilities

Getting even more protection for your network is easy to do. If you install a communication card in your 9140, you can easily integrate Eaton’s free Intelligent Power® Software Suite. This allows you to monitor and manage the power devices on your network from a single interface, giving you up-to-the-minute information on the status of power in your network. The Intelligent Power Software Suite:

• Provides critical information, such as UPS battery condition, load levels and battery runtime
• Seamlessly integrates with VMware® vCenter Server™ dashboard
• Triggers migration applications to move virtual machines during a power failure
• Gracefully shuts down computers and virtual machines/servers during an extended power outage
• Work with VMware, Microsoft®, Citrix® and Red Hat® virtualization platforms

To learn more, please just call us on 0800 978 8988

Overall Marks by Critical Power Supplies Ltd

Ease of installation 9 out of 10.

Design and build quality 9 out of 10.

Software functionality 10 out of 10.

Options and service plans 9 out of 10.

Overall - great product, feature rich at a great price.

To purchase this product from our web site please click here or just call us on 0800 978 8988

To download the product datasheet please click here

How to achieve Outstanding Spike and Electrical Noise protection:

The very best power protection comes from a special type of transformer known as a Constant Voltage Transformer (CVT). Providing unparalleled reliability and conditioning performance, spikes and electrical noise are neutralised with attenuation as high as 75dB.

In addition the input and output transformer windings are physically separated. Known as Galvanic isolation this separation ensures that there is no direct connection between the mains supply and load. A CVT therefore provides an impenetrable barrier to spikes and high frequency electrical noise. This barrier also works in reverse mode to prevent a 'noisy' load from polluting the mains supply itself.

Click here to review the CVT product homepage

Superior sag surge and brownout protection:

Mains voltage sags and surges are automatically corrected by a CVT. When faced with an extreme surge voltage such as a local lightning strike the power conditioner will present a low impedance to the mains to protect both itself and any connected loads.

Automatic sine-wave generation:
using ferro resonant transformer technology means that each power conditioner will always generate a pure stable sine-wave even when fed from a polluted mains or square-wave supply.

Perfect switched-mode-power-supply (SMPS) driver:

Ferro resonant transformer technology provides waveform shoulder-lifting - the CVT is the kindest way to drive a switched mode power supply. Input surges are reduced prolonging life and conduction times are lengthened. In addition the CVT provides harmonic buffering and improved reservoir capacitor hold up for the inevitable supply micro breaks which occur with grid protection switching.

CVT how does it work?

AC stabilisation can be achieved using a simple magnetic device which has no moving parts. This is a process of producing a constant ac voltage from a varying ac voltage supply and involves the use of saturable reactors. The latter may be incorporated in a special transformer magnetic saturation being produced in a part of the magnetic circuit.

The winding arrangement and construction of one such constant voltage transformer is shown in the diagram:

The core is a three-limbed shell with a magnetic leakage path dividing the winding space. On the upper winding space is the primary and a
compensating winding while the lower winding space carries the secondary which has a capacitor connected across it. An increasing
voltage applied to the primary produces an increasing flux in the main magnetic circuit and the secondary voltage increases proportionally to
this voltage. The increasing flux produces an increase in the leakage reactance of the secondary and this approaches a value which resonates
with the capacitor connected across it. As the condition of resonance is reached the secondary current rises rapidly saturating the lower portions
of the magnetic circuit. The flux due to the primary is diverted through the magnetic shunt and further increases in primary voltage produces
little change in the secondary emf. It increases very slowly and this is offset by the emf induced in the compensating winding on the upper
portion of the core which is connected in series opposition to the secondary winding.

Thus once the secondary is brought to resonance the output voltage from the secondary and compensating windings is
constant and it is under these conditions that the transformer is used. The advantage of this form of stabilisation is that it can be applied to the heater supplies in addition to any HT supplies derived from it. Owing to the non-sinusoidal waveform however readings taken with the usual rectifier-type meters are subject to error.

The compensating winding produces a small voltage which is used to 'buck' the output voltage. To produce a sinusoidal waveform a further winding is added which is coupled via a magnetic gap. This extra 'neutralising' winding can be arranged to provide a suitable amount of 3rd and 5th harmonics which when summed with the output 'square' wave above results in a sinewave.

Click here to review the CVT product homepage

Eaton UPS product Update -

Eaton has just announed new connectivity cards for their UPS solutions will be shipping from February 2012.

Network Card-MS
The new Network Card-MS (Network-MS) replaces Eaton’s previous ConnectUPS-MS card (103006826) and the Network Management Card (66102). The Network Card–MS Web/SNMP Card allows an Eaton UPS to directly connect to Ethernet networks and the Internet, supporting real-time monitoring and control of UPSs across the network via a standard Web browser, SNMP-compliant network management system or power management software.

Features include:
- Versatile support through HTTP, SNMP, SMTP, Telnet, SSL and SSH compatibility
- Remote management of a UPS or rebooting of protected devices over SNMP/Web
- Customizable actions including automatic shutdown in the event of an extended power failure
- Email notification of alerts
- Compatible with SNMPv3 and IPv6

Network and MODBUS Card-MS
The new Network and MODBUS Card-MS (MODBUS-MS) replaces the former iNMC (industrial Network Management Card 66103). This option provides all of the features listed above in the Network Card-MS as well as continuous, reliable and accurate remote monitoring of a UPS system through a Building Management System (BMS) or Industrial Automation System (IAS). Enabling data to be integrated from the UPS into a wide variety of management systems, the Network and MODBUS Card-MS combines an SNMP agent, HTTP/Web server and a MODBUS card, facilitating UPS supervision from any network monitoring system using SNMP and traps, or any web browser.
New functionality: supports 9130 UPS

Relay Card-MS
The new Relay Card-MS (Relay-MS) replaces Relay Management Card Contacts & RS232 –MS (103006828) and Relay Management Card (66104). The card provides a simple way to remotely deliver UPS information to an alarm system, PLC or computer system via dry contacts (relay), or it can be an RS232 interface for connection to a PC.

Please see the table below for confirmation of old and new part numbers.

Our e-store and web pages will be updated over the next 5working days, however  if you have any queries please contact us on 0845 519 3638 or email support@criticalpowersupplies.co.uk

Note: National roll out projects will not be affected by this product update.

Yours sincerely.

Support @ Critical Power Supplies.

After talking to a customer in Sengal, West Africa today (7/01/2012), we thought we would post the following to help all our customers calculate their load and battery solution correctly when considering Power Inverter applications:

Selecting a battery or system of batteries that will provide your Inverter/Charger with proper DC voltage and an adequate amp-hour capacity to power your application is straight forward. Even though Tripp Lite Inverter/Chargers are highly-efficient at DC-to-AC inversion, their rated output capacities are limited by the total amp-hour capacity of connected batteries and the support of your vehicle’s alternator if the engine is kept running.

• STEP 1: Determine Total Wattage Required
Add the wattage ratings of all equipment you will connect to your Inverter/Charger. Wattage ratings are usually listed in equipment manuals or on nameplates. If your equipment is rated in amps, multiply that number times AC utility voltage to determine watts. (Example: a ¼ in. drill requires 2½ amps. 2½ amps × 120 volts = 300 watts .)

Note: Your Inverter/Charger will operate at higher efficiencies at about 75% - 80% of nameplate rating.

• STEP 2: Determine DC Battery Amps Required
Divide the total wattage required (from step 1, above) by the battery voltage (12) to determine the DC amps required.

540 watts ÷ 12V = 45 DC Amps

• STEP 3: Estimate Battery Amp-Hours Required (for operation unsupported by the alternator)
Multiply the DC amps required (from step 2, above) by the number of hours you estimate you will operate your equipment exclusively from battery power before you have to recharge your batteries with utility- or generator-supplied AC power. Compensate for inefficiency by multiplying this number by 1.2. This will give you a rough estimate of how many amp-hours of battery power (from one or several batteries) you should connect to your Inverter/Charger.

45 DC Amps × 5 Hrs. Runtime
× 1.2 Inefficiency Rating = 270 Amp-Hours

NOTE! Battery amp-hour ratings are usually given for a 20-hour discharge rate. Actual amp-hour capacities are less when batteries are discharged at faster rates. For example, batteries discharged in 55 minutes provide only 50% of their listed amp-hour ratings, while batteries discharged in 9 minutes provide as little as 30% of their amp-hour ratings.

• STEP 4: Estimate Battery Recharge Required, Given Your Application
You must allow your batteries to recharge long enough to replace the charge lost during inverter operation or else you will eventually run down your batteries. To estimate the minimum amount of time you need to recharge your batteries given your application, divide your required battery amp-hours (from step 3, above) by your Inverter/Charger’s rated charging amps.

270 Amp-Hours ÷ 55 Amps
Inverter/Charger Rating = 5 Hours Recharge

NOTE! For Tripp Lite Inverter/Chargers providing 1250 watts or less of continuous AC power, a full-size battery will normally allow sufficient power for many applications before recharging is necessary. For mobile applications, if a single battery is continuously fed by an alternator at high idle or faster, then recharging from utility or generator power may not be necessary. For Tripp Lite Inverter/Chargers over 1250 watts used in mobile applications, Tripp Lite recommends you use at least two batteries, if possible fed by a heavy-duty alternator anytime the vehicle is running. Tripp Lite Inverter/Chargers will provide adequate power for ordinary usage within limited times without the assistance of utility or generator power. However, when operating extremely heavy electrical loads at their peak in the absence of utility power, you may wish to “assist your batteries” by running an auxiliary generator or vehicle engine, and doing so at faster than normal idling.

If you need additional information or assistance with sizing your battery please call us on 0845 519 3638 or contact us via e-mail.

Everyday questions from IT Managers:

• How do you reliably power single power source switches in Rack?
• I need an STS I can control over the network but who makes one?
• I need a 1U 16amp STS, but having trouble finding one?
• I need an extended warranty on my STS, but can't get three years or more, who provides one?

Well Critical Power Supplies has the answers in the form of the Eaton 16amp STS and the Riello MultiSwitch MNS

Click here to read more >

Device protection

Product Focus "Secure-Tec Surge Protection 15.000 A" With acoustic warning when surge protection fails.

Purchase online at Critical Power Supplies Ltd E-Store

Features and Benefits.