Delta VFD055B43A

Preface
Thank you for choosing DELTA’s high-performance VFD-B Series. The VFD-B Series is manufactured with
high-quality components and materials and incorporate the latest microprocessor technology available.
This manual is to be used for the installation, parameter setting, troubleshooting, and daily maintenance of the
AC motor drive. To guarantee safe operation of the equipment, read the following safety guidelines before
connecting power to the AC motor drive. Keep this operating manual at hand and distribute to all users for
reference.
To ensure the safety of operators and equipment, only qualified personnel familiar with AC motor drive are to
do installation, start-up and maintenance. Always read this manual thoroughly before using VFD-B series AC
Motor Drive, especially the WARNING, DANGER and CAUTION notes. Failure to comply may result in
personal injury and equipment damage. If you have any questions, please contact your dealer.
PLEASE READ PRIOR TO INSTALLATION FOR SAFETY.
DANGER!
1. AC input power must be disconnected before any wiring to the AC motor drive is made.
2. A charge may still remain in the DC-link capacitors with hazardous voltages, even if the power has been
turned off. To prevent personal injury, please ensure that power has turned off before opening the AC
motor drive and wait ten minutes for the capacitors to discharge to safe voltage levels.
3. Never reassemble internal components or wiring.
4. The AC motor drive may be destroyed beyond repair if incorrect cables are connected to the input/output
terminals. Never connect the AC motor drive output terminals U/T1, V/T2, and W/T3 directly to the AC
mains circuit power supply.
5. Ground the VFD-B using the ground terminal. The grounding method must comply with the laws of the
country where the AC motor drive is to be installed. Refer to the Basic Wiring Diagram.
6. VFD-B series is used only to control variable speed of 3-phase induction motors, NOT for 1-phase motors
or other purpose.
7. VFD-B series shall NOT be used for life support equipment or any life safety situation.

Delta VFD055B43A Specifications

General

Model	Delta VFD055B43A
Category	DC Drives
Output Power	5.5 kW
Cooling Method	Fan cooling
Horsepower	7.5 hp
Input Phase	3-phase
IP Rating	IP20
Input Voltage	3-phase 380-480V AC
Control Method	V/F Control, Sensorless Vector Control, Closed-Loop Vector Control

Summary

Preface

Safety Guidelines

Crucial safety information and warnings for operating the AC motor drive.

Chapter 3 Start Up

Preparations and Trial Run

Critical checks, preparations, and steps for performing a trial run before normal operation.

Chapter 4 Digital Keypad Operation

Digital Keypad VFD-PU01 Overview

Operating the Digital Keypad

Chapter 5 Parameters

Parameter Group Overview

Introduction to the 12 parameter groups and their general functions for easy setting.

Summary of Parameter Settings

Overview of parameter settings, including user parameters, basic parameters, and operation method parameters.

Parameter Settings for Applications

Description of Parameter Settings

Detailed explanation of individual parameters, their settings, and factory defaults.

Chapter 6 Fault Code Information

Common Problems and Solutions

Troubleshooting guide for common fault names, descriptions, and corrective actions.

Reset Procedures

Chapter 7 Troubleshooting

Over Current (OC) Troubleshooting

Troubleshooting flowchart for over-current faults, including possible causes and solutions.

Ground Fault and Over Voltage (OV) Troubleshooting

Diagnostic steps for ground fault and over-voltage issues, including wiring and voltage checks.

Low Voltage (Lv) and Over Heat (OH) Troubleshooting

Troubleshooting guide for low voltage and overheating problems, focusing on power and ventilation.

Overload (OL) and Phase Loss (PHL) Troubleshooting

Solutions for overload faults and steps to troubleshoot phase loss issues.

Motor Operation Troubleshooting

Chapter 8 Maintenance and Inspections

Daily and Periodic Inspections

Appendix C How to Select the Right AC Motor Drive

Capacity Formulas and Precautions

Motor Selection Guidelines