Some motor loads are heat sensitive to frequency changes. must be converted for voltage with a transformer and then also have their gears and/or pulleys changed for speed correction. However, motor loads whose proper operation depends upon frequency, such as clocks, turntables, timers, cassette players, etc. Frequency is unimportant to the normal operation of most loads: most motor driven loads will simply run at a slightly different speed than they did at their rated frequency simple heating equipment (broilers, coffee pots, etc.) will operate with no problem at all. No transformer of any type can change frequency. Autotransformers perform in much the same way as the transformer that the electric company uses to bring electricity to a building. It also has better voltage stability and greater overload tolerance.
An autotransformer is much smaller and lighter than an isolation transformer. Thus, a load may operate anywhere around the world, as long as a transformer is available to convert the local voltage to the voltage it requires.Īn autotransformer, with a single tapped winding (diagrammed above), is generally preferred to an isolation transformer, with 2 separate windings, for many reasons. shall be referred to as the load.Īn autotransformer is a tapped winding transformer that changes the voltage available locally to the voltage required by a particular load. This is done with a transformer.įor the purpose of this article, all types of appliances, tools, equipment, machinery, etc. When using electrical appliances/equipment designed for a specific voltage, it is necessary to adjust the local voltage to the voltage for which the equipment was designed. Most appliances are made to operate on a single voltage and frequency.
CONVERT VA TO WATTS UPGRADE
Alternatively, if you are looking to upgrade your current UPS, refer to our UPS Upgrade Selector and don’t forget to utilize our Trade-UPS Program which allows you to receive up to a 25% discount on the purchase of a new APC by Schneider Electric UPS when you trade in your old model, regardless of the manufacturer.įor further discussion regarding the differences between Watts and VA please refer to White Paper 15, Watts and Volt Amps: Powerful Confusion.Voltage and frequency (Hz) vary throughout the world, and, in some cases, within the same country. Please refer to our UPS Selector for help properly sizing a UPS. The difference between 0.8 or 0.9 power factors and a unity power factor (1.0) may not sound like much – but when you take into account the fact that the extra available wattage can be used to support additional loads and extend run times it is easy to see how the next generation of Smart-UPS On-Line will increase your availability while saving you money. Smaller models of the next generation of Smart-UPS On-Line have a 0.9 power factor or higher, and all are Energy Star™ qualified regardless of VA. Models 6kVA (6000 VA) and higher have a unity power factor, which means VA translates to an equal amount of Watts (i.e. This power factor is what really matters when sizing a UPS for your specific requirements.ĪPC™ by Schneider Electric’s™ latest generation of Smart-UPS™ On-Line now delivers innovative features to help you make the most of your energy™. The ratio of the Watts to VA is called the "Power Factor" and is expressed either as a number (i.e. What you really need to know is that for electronics such as computers and UPSs, Watt and VA ratings can differ significantly with the VA rating always being equal to or larger than the Watt rating. The Watt rating determines the actual power purchased from the utility company and the heat loading generated by the equipment and the VA rating is used for sizing wiring and circuit breakers. Watts is the real power drawn by the equipment, while volt-amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. Most of us have heard of Watts before – and have some understanding that each piece of equipment has a certain amount of Watts it draws to operate, but how exactly does that relate to a UPS? And what is a VA anyway?Įlectronics have both maximum Watt ratings and maximum VA (volt-ampere) ratings and neither the Watt nor the VA rating of a UPS may be exceeded by the attached equipment (load).
So have you ever decided to research some UPSs to see which is the right fit for you, only to be left asking yourself, "Watts? VA? Huh?" Between the increasingly fragile power grid, the escalating power consumption of IT equipment and the constantly increasing importance of our network, it isn't difficult to see the value a UPS (uninterruptible power supply) has to not only a business, but a home.
0 kommentar(er)
