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Delta VFD055B23A

Delta VFD055B23A
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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.

Table of Contents

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Delta VFD055B23A Specifications

General IconGeneral
Output Power5.5 kW
Horsepower7.5 HP
IP RatingIP20
Input Phase3 Phase
Protection FeaturesOvercurrent, Overvoltage, Overheating, Short Circuit
Operating Temperature-10°C ~ +50°C
Storage Temperature-20°C to 60°C
Humidity90% RH, non-condensing
Altitude1000 m (Derate above 1000 m)
SeriesDelta VFD-B Series

Summary

Preface

PLEASE READ PRIOR TO INSTALLATION FOR SAFETY.

Important safety guidelines to read before installation and connecting power to the AC motor drive.

WARNING!

Key warnings related to handling sensitive electronic components and testing procedures.

Chapter 2 Installation and Wiring

2.2 Installation

Guidelines for mounting the AC motor drive vertically, ensuring proper space for heat dissipation.

2.4 Wiring

Guidelines and precautions for connecting power and control terminals during wiring.

2.4.1 Basic Wiring

Essential steps for basic wiring, including power application and post-wiring checks.

2.4.3 Main Terminals Connections

Details the terminal symbols and their corresponding functions for mains power and control circuits.

2.4.4 Control Terminals

Provides circuit diagrams for digital inputs (SINK and SOURCE modes) and explains grounding terminals.

2.4.5 Main Circuit Terminals

Details main circuit terminals for 1HP to 3HP models, including torque and wire specifications.

Chapter 3 Start Up

3.1 Preparations before Start-up

Essential checks before start-up, including wiring correctness, terminal connections, and equipment status.

3.3 Trial Run

Steps for performing a trial run after initial preparation, checking motor rotation and operational stability.

Chapter 4 Digital Keypad Operation

4.2 How to Operate the Digital Keypad VFD-PU01

Provides step-by-step instructions for operating the digital keypad, including selection, parameter setting, and data modification.

Chapter 5 Parameters

5.1 Summary of Parameter Settings

Provides a summary of parameter settings divided into 12 groups, detailing parameter numbers, explanations, settings, and factory defaults.

Group 6 Protection Parameters

Details parameters for protecting the drive against over-voltage, over-current, overheating, and other fault conditions.

5.3 Description of Parameter Settings

Provides detailed descriptions for user parameters (00-00, 00-01), including identity codes and rated current display.

Group 1: Basic Parameters

Covers fundamental parameters like maximum output frequency, voltage, and mid-point settings for the V/f curve.

02 - 02 Stop Method

Determines how the motor stops upon receiving a stop command or detecting an external fault (ramp or coast).

Group 3: Output Function Parameters

Configures multi-function output relays and terminals (MO1, MO2, MO3) for various operational statuses and fault indications.

Group 5: Multi-step speeds and PLC (Process Logic Control) parameters

Defines multi-step speed frequencies and parameters for PLC programs, controlling sequence and timing.

05 - 15 PLC Mode

Selects the PLC operation mode (disable, single cycle, continuous, step-by-step) for the AC motor drive.

Group 6 Protection Parameters

Details parameters for protecting the drive against over-voltage, over-current, overheating, and other fault conditions.

06 - 01 Over-Current Stall Prevention during Acceleration

Prevents motor stall during acceleration by stopping or holding frequency when output current exceeds limits.

06 - 03 Over-Torque Detection Mode (OL2)

Determines the drive's response to over-torque detection, including running or stopping behavior.

Group 7 Motor Parameters

Covers parameters related to motor characteristics such as rated current, no-load current, torque compensation, and auto-tuning.

07 - 05 Motor Parameters Auto Tuning

Enables auto-tuning for motor parameters, either without motor running or with a no-load test.

08 - 14 Auto Restart After Fault

Enables automatic reset/restart of the drive after specific faults (OC, OV) up to 10 times.

08 - 19 Speed Search during Start-up

Enables or disables speed search for starting motors with high inertia, improving restart after power loss.

Group 10 PID Control Parameters

Covers parameters for PID control, including input terminals, gains, and feedback signal error handling.

10 - 03 Integral Gain ( I )

Specifies the integral control gain (I), defining the output's response to sustained deviation.

10 - 07 PID Output Frequency Limit

Defines the percentage limit for output frequency during PID control, capping the maximum output.

10 - 12 ASR (Auto Speed Regulation) control (with PG only) (P)

Specifies proportional control and gain (P) for speed control using PG (encoder) feedback.

Chapter 6 Fault Code Information

6.1 Common Problems and Solutions

Lists common fault names, descriptions, and corrective actions for issues like over-current and IGBT protection.

6.2 Reset

Describes three methods to reset the AC motor drive after a fault has been cleared: keypad, external terminal, or communication.

Chapter 7 Troubleshooting

7.1 Over Current (OC)

Troubleshooting flowchart for over-current faults, covering acceleration, deceleration, and steady-state conditions.

7.2 Ground Fault

Troubleshooting steps for ground fault issues, focusing on output circuit grounding and IGBT module checks.

7.3 Over Voltage (OV)

Troubleshooting flowchart for over-voltage faults, addressing voltage specification, regeneration, and deceleration time.

7.4 Low Voltage (Lv)

Troubleshooting flowchart for low voltage faults, covering power loss, circuit issues, and voltage checks.

7.5 Over Heat (OH)

Troubleshooting steps for over-heat conditions, focusing on heatsink temperature, cooling fan, and ambient conditions.

7.9 Motor cannot Run

Flowchart for diagnosing why the motor cannot run, checking PU01 display, faults, input voltage, wiring, and parameters.

7.10 Motor Speed cannot be Changed

Troubleshooting guide for issues where motor speed cannot be changed, checking frequency settings, PLC mode, and signals.

7.11 Motor Stalls during Acceleration

Flowchart for motor stalls during acceleration, examining acceleration time, inertia, voltage, load torque, and wiring.

7.12 The Motor does not Run as Expected

Steps to diagnose why the motor is not running as expected, checking parameters, load, output voltage, and torque compensation.

Chapter 8 Maintenance and Inspections

Periodic Inspection:

Procedure for periodic inspection, including safety precautions like power-off and capacitor discharge confirmation.

DANGER!

Critical safety warnings for maintenance, emphasizing power disconnection, qualified personnel, and preventing electric shock.

Appendix C How to Select the Right AC Motor Drive

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