K-ECJ45 Variable Frequency Controller Description The NTN K-ECJ45 is a compact, high-function variable frequency controller designed for precise control of vibratory feeders and similar equipment. It is particularly suitable for applications requiring fine-tuned frequency adjustments to ensure consistent material flow and handling. Feature And Application of K-ECJ45 Feature Application Control Capacity : 4.5A at 230V AC, suitable for driving various vibratory feeder models.