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# Variable Frequency Drives Explained: Wiring, Parameters & Troubleshooting Guide
- URL: https://inferconautomation.com/blog/vfd-wiring-parameters-troubleshooting/
- Published: 2026-02-20T00:30:00.000Z
- Updated: 2026-02-20T00:30:00.000Z
- Description: Complete guide to VFD variable frequency drives — from wiring diagrams and parameter configuration to common fault codes and troubleshooting. Covers Schneider Altivar, Mitsubishi variable frequency drive, and Delta VFD controllers used in industrial automation.
- Author: Inferconautomation
- Tags: Drives & Motion, VFD, #Import 2026-10-29 12:58

Variable Frequency Drives (VFDs) are among the most important devices in modern industrial automation, responsible for controlling AC motor speed, reducing energy consumption, and enabling soft-start functionality. This guide covers wiring, parameter setup, and fault diagnosis for Schneider Electric Altivar series drives.

## Critical Parameters to Configure (Altivar 320)

- **bFr (Motor Frequency):** Set to motor nameplate frequency (50 Hz in India)
- **ACC (Acceleration Ramp):** Typically 3–10 seconds

> **⚠️ Safety Warning**Always wait at least 5 minutes after disconnecting power before opening the drive cover — DC bus capacitors retain dangerous voltage.