Several options exist to mitigate harmonic problems in plants. Unfortunately, there is no one solution that fits all applications. Finding and choosing the correct option for your needs is the key. Otherwise, failure to reduce these unwanted electrical currents can result in problems ranging from overheating neutral conductors and transformers to inefficient operation of electronic equipment.
Adjustable speed drives can be used in most applications where motors power mechanical equipment. Drives provide precise electrical motor control, enabling motor speeds to be ramped up and down or maintained at a required speed. The obvious benefit is the motor and drive use only the require amount of energy, rather than having a motor run at a fixed speed.
A PLC for process control can appear to be less expensive, but… Bill Lydon, contributing editor at Automation.com has talked with a number of control engineers that are trying to sort out this issue to make decisions.