INVT Goodrive270 Series User Manual

Goodrive270 series VFD for fan and pump Communication protocol
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The calculation adopts the international standard CRC check rule. You can refer to the related
standard CRC algorithm to compile the CRC calculation program as required.
The following example is a simple CRC calculation function for your reference (using the C
programming language):
unsigned int crc_cal_value(unsigned char*data_value,unsigned char
data_length)
{
int i;
unsigned int crc_value=0xffff;
while(data_length--)
{
crc_value^=*data_value++;
for(i=0;i<8;i++)
{
if(crc_value&0x0001)
crc_value=(crc_value>>1)^0xa001;
else
crc_value=crc_value>>1;
}
}
return(crc_value);
}
In the ladder logic, CKSM uses the table look-up method to calculate the CRC value according to the
content in the frame. The program of this method is simple, and the calculation is fast, but the ROM
space occupied is large. Use this program with caution in scenarios where there are space
occupation requirements on programs.
9.4 RTU command code and communication data
9.4.1 Command code 03H, reading N words (continuously up to 16 words)
The command code 03H is used by the master to read data from the VFD. The count of data to be
read depends on the "data count" in the command. A maximum of 16 pieces of data can be read. The
addresses of the read parameters must be contiguous. Each piece of data occupies 2 bytes, that is,
one word. The command format is presented using the hexadecimal system (a number followed by
"H" indicates a hexadecimal value). One hexadecimal value occupies one byte.
The 03H command is used to read information including the parameters and running status of the
VFD.
For example, if the master reads two contiguous pieces of data (that is, to read content from the data
addresses 0004H and 0005H) from the VFD whose address is 01H, the frame structures are
described in the following.
RTU master command (from the master to the VFD)

INVT Goodrive270 Series Specifications

General

Control Mode	V/F control, Sensorless vector control
IP Rating	IP20
Cooling Method	Air cooling
Overload Capacity	150% for 60 seconds
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overheat, Overload, Short circuit
Communication	RS485, Modbus
Application	Water pump
Input Frequency	50Hz/60Hz
Output Voltage	0~Rated Voltage
Rated Current	Depends on the model
Operating Temperature	-10°C to +40°C
Storage Temperature	-20°C to 60°C
Humidity	<95% (non-condensing)
Altitude	Below 1000m

Summary

Change History

Preface

Safety Precautions

Safety Definitions and Warnings

Defines safety terms (Danger, Warning, Note) and lists warning symbols.

General Safety Guidelines

Covers essential precautions for handling, installation, operation, and maintenance.

Quick Startup Guide

Product Inspection and Environment Checks

Details unpacking, pre-use checks, and environmental requirements for VFD installation.

Basic Commissioning Steps

Outlines fundamental steps for initial VFD setup, motor parameter configuration, and autotuning.

Product Overview

Working Principles and Specifications

Explains the VFD's basic principles, technical specifications, and features.

Model Designation and Ratings

Details the VFD model designation code and product ratings for various power outputs.

VFD Structure and Components

Illustrates the physical structure and identifies the main components of the VFD.

Installation Guidelines

Mechanical Installation

Covers environment, direction, mounting methods, clearances, and cabinet installation.

Wiring Guidelines

Details main circuit, control circuit, external keypad, and wiring protection procedures.

Basic Operation Guidelines

Keypad Operation and Display

Explains LED and LCD keypad functions, parameter display, and editing.

Core VFD Configuration and Control Modes

Covers parameter configuration, autotuning, control modes (Vector, Space Voltage), and frequency settings.

Advanced Functions and Controls

Details Simple PLC, PID control, water pump control, and protection features.

Function Parameter List

Basic and Motor Parameters (P00-P03)

Covers basic functions, motor 1 parameters, vector control, and V/F control for motor 1.

Control and I/O Parameters (P04-P07, P09-P11)

Details V/F control for motor 2, input/output terminals, human-machine interface, enhanced functions, PID, and protection.

Specific Functions and Settings (P10, P12-P28, P90-P96)

Covers Simple PLC, motor 2 parameters, communication, status, HVAC, water pump, and protection functions.

Troubleshooting Common Faults

Fault Indicators and Reset

Explains how faults are indicated and how to reset them.

Fault History and Solutions

Lists common faults, their causes, and solutions for troubleshooting.

Interference Countermeasures

Addresses interference issues with sensors, RS485, motor cables, and RCDs.

VFD Maintenance

Periodical Inspection and Cooling Fan

Outlines routine checks for VFD components and procedures for cooling fan replacement.

Capacitor and Power Cable Maintenance

Describes capacitor reforming, replacement, and power cable inspection.

Communication Protocol

Modbus RTU Communication

Details Modbus protocol, RTU frame structure, error checks, and command examples.

Expansion Card Communication

Explains wiring and functions for PROFIBUS, CAN, and PROFINET expansion cards.

Technical Data and Compliance

Derating, Specifications, and EMC

Covers derating conditions, technical specifications, EMC requirements, and application standards.

Dimension Drawings

Keypad and VFD Mounting Dimensions

Provides detailed dimensions for keypads, VFDs, and mounting brackets.

Optional Peripheral Accessories

Filters, Reactors, and Cables

Details selection guidelines for filters, reactors, and power/control cables.

Breakers, Contactors, and Other Accessories

Covers selection of breakers, contactors, and other optional accessories.

Further Information

Product Queries and Feedback

Contact information for product queries, service, and manual feedback.