Some of the improvements attained by EVER-POWER drives in energy performance, productivity and process control are truly remarkable. For example:
The savings are worth about $110,000 a year and have slice the company’s annual carbon footprint by 500 metric tons.
EVER-POWER medium-voltage drive systems allow sugar cane vegetation throughout Central America to become self-sufficient producers of electrical energy and enhance their revenues by as much as $1 million a 12 months by selling surplus power to the local grid.
Pumps operated with adjustable and higher speed electric motors provide numerous benefits such as for example greater selection of flow and mind, higher head from an individual stage, valve elimination, and energy conservation. To achieve these benefits, nevertheless, extra care should be taken in choosing the appropriate system of pump, electric motor, and electronic engine driver for optimum conversation with the process system. Effective pump selection requires understanding of the complete anticipated selection of heads, flows, and specific gravities. Engine selection requires appropriate thermal derating and, at times, a coordinating of the motor’s electrical characteristic to the VFD. Despite these extra design considerations, variable velocity pumping is now well accepted and widespread. In a straightforward manner, a conversation is presented on how to identify the benefits that variable velocity offers and how exactly to select components for hassle free, reliable operation.
The first stage of a Adjustable Frequency AC Drive, or VFD, is the Converter. The converter is usually made up of six diodes, which are similar to check valves used in plumbing systems. They enable current to Variable Speed Electric Motor stream in only one direction; the direction shown by the arrow in the diode symbol. For instance, whenever A-phase voltage (voltage is comparable to pressure in plumbing systems) is certainly more positive than B or C phase voltages, then that diode will open and allow current to flow. 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 holds true for the 3 diodes on the negative side of the bus. Therefore, we obtain six current “pulses” as each diode opens and closes.
We can eliminate the AC ripple on the DC bus with the addition of a capacitor. A capacitor functions in a similar fashion to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and provides a simple dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Thus, the voltage on the DC bus turns into “around” 650VDC. The actual voltage depends on the voltage degree of the AC line feeding the drive, the amount of voltage unbalance on the energy system, the electric motor load, the impedance of the energy program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, may also be just referred to 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 usually referred to as an “inverter”.
In fact, drives are an integral part of much bigger EVER-POWER power and automation offerings that help customers use electricity effectively and increase productivity in energy-intensive industries like cement, metals, mining, oil and gas, power generation, and pulp and paper.