Delta VFD-B Series

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 VFD-B Series Specifications

General

Brand	Delta
Model	VFD-B Series
Category	DC Drives
Language	English

Summary

Chapter 1 Introduction

1.3 Preparation for Installation and Wiring

Steps required to prepare the AC motor drive before installation and wiring, including keypad removal.

Chapter 2 Installation and Wiring

2.2 Installation

Detailed instructions for mounting and installing the AC motor drive unit.

2.4 Wiring

Chapter 3 Start Up

3.1 Preparations before Start-up

Chapter 4 Digital Keypad Operation

4.1 Description of the Digital Keypad VFD-PU01

4.2 How to Operate the Digital Keypad VFD-PU01

Chapter 5 Parameters

5.1 Summary of Parameter Settings

5.2 Parameter Settings for Applications

5.3 Description of Parameter Settings

Chapter 6 Fault Code Information

6.1 Common Problems and Solutions

Lists common fault names, descriptions, and corresponding corrective actions for troubleshooting.

Chapter 7 Troubleshooting

7.1 Over Current (OC)

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

7.2 Ground Fault

Troubleshooting guide for ground fault errors, including checks for wiring and insulation.

7.3 Over Voltage (OV)

Troubleshooting steps for over-voltage conditions, including checking voltage and regeneration.

7.4 Low Voltage (Lv)

Troubleshooting guide for low-voltage faults, covering power supply and circuit checks.

7.5 Over Heat (OH)

Troubleshooting steps for overheating issues, focusing on heatsink temperature and cooling.

7.6 Overload

Troubleshooting for overload conditions, including motor load and thermal relay settings.

7.8 Phase Loss (PHL)

Troubleshooting guide for phase loss faults, checking wiring and input voltage.

7.9 Motor cannot Run

Flowchart to diagnose why the motor is not running, covering power, faults, and settings.

7.10 Motor Speed cannot be Changed

Troubleshooting guide for issues where motor speed cannot be adjusted.

7.11 Motor Stalls during Acceleration

Diagnosing and resolving motor stalling issues during acceleration.

7.12 The Motor does not Run as Expected

Troubleshooting steps when the motor's performance deviates from expectations.

Appendix C How to Select the Right AC Motor Drive

C.1 Capacity Formulas

C.3 How to Choose a Suitable Motor