Delta VFD-H User Manual

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APPENDIX
B
Serial Communications
The different AC motor drive parameters can be programmed and displayed by remote control
via the RS-485 serial interface. A personal computer may be used to load, change, or monitor
the parameter value through the PC‘s RS-485 interface, which permits communication with
higher-level automation systems. This appendix describes the following:

Computer Control

Data Format and Protocol

Character Delay Time and Response Delay Time
Computer Control
The VFD-A series AC motor drive has a built in RS-485 serial communication port on its control
terminal block marked SG+, SG-. The two connector pins are defined as follows:
SG ＋ : Signal ＋
SG－ : Signal －
Each VFD-A AC motor drive has a pre-assigned slave address specified by Pr.-78. The computer
may select any AC drive according to this slave address. The computer may also control all of the
AC drives connected to it when the “A” code in command string is 02H.
Data Format and Protocol
 Data Format
 Baud Rate (Transmission speed in bits per second)
 Range of values: 1200, 2400, 4800 Baud (See Pr.-77)
 Eleven (11) bits are required to represent each character, as shown in the following
example:
Number of bits Function
1 start bit
8 data bits
1 odd parity bit
1 stop bit

Delta VFD-H Specifications

General

Brand	Delta
Model	VFD-H
Category	DC Drives
Language	English

Summary

Installation and Wiring

Installation Requirements

Main Circuit Wiring

Terminal designations and connection details for power input and motor output circuits.

Control Circuit Wiring

Terminal descriptions and functions for control signals and external interfaces.

Basic Wiring Diagram

Illustrates typical wiring connections for power and control circuits for safe operation.

Digital Keypad Operation

Digital Keypad Parts and Functions

Digital Keypad Operating Modes & Programming Steps

Start-up Procedures

Initial Operation - Motor Disconnected

Steps for initial setup and selecting operation modes before connecting the motor.

Initial Operation – Setting Parameters and Connecting the Motor

Parameter Settings

Operation Modes

Parameters for selecting frequency and command sources for drive control.

V/F Data Settings

Parameters defining voltage-frequency curve characteristics for optimal motor control.

Accel. / Decel. Time Setting

Parameters for setting acceleration and deceleration ramp times for smooth operation.

Frequency Reference Setting

Operating and Protective Functions Setting

External Control Terminal Configuration

Torque and Slip Compensation

Parameters for enhancing starting torque and compensating for motor slip.

Overload Detection Settings

Parameters for electronic thermal overload relay and over-torque detection functions.

Display Functions

System Functions

Troubleshooting and Fault Information

Common Problems and Solutions

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

APPENDIX B Serial Communications

Computer Control and Data Format

Protocol

Details command structures for controlling, setting, and reading drive parameters remotely.

APPENDIX G Circuit Breaker and Fuse Charts

Non-fuse Circuit Breaker Chart

Fuse Specification Chart