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Learning Objectives:

• Setting five parameters can take care of most VFD programming.
• Consider VFD control method, motor FLA, acceleration and deceleration times.
• Also consider speed and run source and fault rest.

Variable frequency drives (VFD) are electronic devices using fast acting switches or insulated gate bipolar transistor (IGBT) to convert three phase input power to a variable frequency and voltage output for motor speed control. VFD settings contain programming, and five parameter changes account for most applications.

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