A few of the improvements attained by EVER-POWER drives in energy effectiveness, productivity and process control are truly remarkable. For instance:
The savings are worth about $110,000 a year and also have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane plants throughout Central America to become self-sufficient producers of electrical energy and increase their revenues by as much as $1 million a 12 months by selling surplus capacity to the local grid.
Pumps operated with variable and Variable Speed Motor higher speed electric motors provide numerous benefits such as for example greater range of flow and head, higher head from a single stage, valve elimination, and energy saving. To achieve these benefits, however, extra care must be taken in selecting the correct system of pump, engine, and electronic motor driver for optimum interaction with the process system. Successful pump selection requires knowledge of the full anticipated selection of heads, flows, and specific gravities. Motor selection requires suitable thermal derating and, sometimes, a coordinating of the motor’s electrical feature to the VFD. Despite these extra design factors, variable rate pumping is now well approved and widespread. In a straightforward manner, a discussion is presented on how to identify the benefits that variable speed offers and how to select parts for trouble free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter can be made up of six diodes, which act like check valves found in plumbing systems. They allow current to circulation in mere one direction; the path proven by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is comparable to pressure in plumbing systems) is certainly more positive than B or C phase voltages, after that that diode will open up and allow current to stream. When B-stage becomes more positive than A-phase, then the B-phase diode will open and the A-stage diode will close. The same is true for the 3 diodes on the negative side of the bus. Thus, we obtain six current “pulses” as each diode opens and closes.
We can get rid of the AC ripple on the DC bus by adding a capacitor. A capacitor works in a similar fashion to a reservoir or accumulator in a plumbing system. This capacitor absorbs the ac ripple and delivers a simple dc voltage. The AC ripple on the DC bus is typically significantly less than 3 Volts. Therefore, the voltage on the DC bus turns into “approximately” 650VDC. The real voltage depends on the voltage level of the AC range feeding the drive, the amount of voltage unbalance on the energy system, the engine load, the impedance of the power system, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just known as a converter. The converter that converts the dc back to ac is also a converter, but to distinguish it from the diode converter, it is generally referred to as an “inverter”.
In fact, drives are an integral part of much larger EVER-POWER power and automation offerings that help customers use electrical energy effectively and increase productivity in energy-intensive industries like cement, metals, mining, coal and oil, power generation, and pulp and paper.