Since the process of converting incoming power from one frequency to another will result in some losses, energy savings must always come from optimizing the performance of the complete system.
First step in determining energy savings potential of a system is to thoroughly analyze the operation of entire system. Detailed knowledge of equipment operation and process requirements are required in order to ensure energy savings. In addition, type of frequency converter, features offered, and overall suitability for application should be considered.
Frequency converters contain three primary sections:
– Rectifier Circuit – consists of diodes, SCRs, or insulated gate bipolar transistors. These devices convert AC line power to direct current.
– DC Bus – consists of capacitors that filter and store the DC charge.
– Inverter – consists of high-voltage, high-power transistors that convert DC power to a variable-frequency, variable-voltage AC output delivered to load.
Frequency converters also contain a powerful microprocessor which controls inverter circuit to produce an almost pure variable-frequency sinusoidal voltage delivered to load. The microprocessor also controls input / output configurations, frequency converter settings, fault conditions and communication protocols.