Inovance MD500 Series User Manual

7. Interfaces and Communication
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7
■
CRC Check
In Modbus-RTU mode, a message includes a CRC-based error-check eld. The CRC eld
checks content of entire message. The CRC eld is two bytes, containing a 16-bit binary
value. The CRC eld is calculated by transmitting device, and then added to message.
The receiving device recalculates a CRC value after receiving message, and compares
the calculated value with the CRC value in the received CRC eld.
The CRC is rst stored to 0xFFFF. Then a procedure is invoked to process the successive
8-bit byte in the message and the value in the register. Only the eight bits in each
character are used for the CRC. The start bit, stop bit and the parity bit do not apply to the
CRC.
During generation of the CRC, each eight-bit character is in exclusive-OR (XOR) with the
content in the register. Then the result is shifted in the direction of the least signicant bit
(LSB), with a zero lled into the most signicant bit (MSB) position. The LSB is extracted
and examined. If the LSB was a 1, the register then performs XOR with a preset value.
If the LSB was a 0, no XOR is performed. This process is repeated until eight shifts have
been performed. After the last (eighth) shift, the next eight-bit byte is in XOR with the
register's current value, and the process repeats for eight more shifts as described above.
The nal value of the register, after all the bytes of the message have been applied, is the
CRC value.
The CRC is added to the message from the low-order byte followed by the high-order
byte. The CRC simple function is as follows:
unsigned int crc_chk_value
（
unsigned char *data_value,unsigned char length
）
{
unsigned int crc_value=0xFFFF;
int i;
while
（
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
）
;
}

Inovance MD500 Series Specifications

General

Protection Level/Enclosure	IP20
Cooling Method	Forced air cooling
Output Voltage	0 ~ Input Voltage
Control Method	V/F control, Sensorless vector control
Communication Protocols	Modbus RTU, CANopen, PROFIBUS-DP
Overload Capacity	150% rated current for 60s, 180% rated current for 3s
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Overtemperature, Phase loss, Short circuit
Braking Unit	Built-in (for lower power models), external (for higher power models)
Operating Temperature	-10°C ~ +50°C (Derating above 40°C)
Carrier Frequency	1kHz-16kHz (adjustable)

Summary

Chapter 7 Interfaces and Communication

About MD500 Terminals

Describes the usage of Digital Input (DI) and Digital Output (DO) terminals.

Safety Information and Precautions

Warnings, Cautions and Notes

Explains the meaning of warning, caution, and note symbols used in the manual.

Electrical Safety

Emphasizes extreme care when working with high voltages within the AC drive.

Machine/System Design and Safety of Personnel

Outlines responsibilities for system design, installation, and safety.

Electrical Installation - Safety

Highlights electrical shock risks, stored energy, and safe practices.

Adjusting AC Drive Parameters

Advises on parameter tuning by qualified personnel and potential risks.

Chapter 1 Product Information

Product Type Identification

Explains how model numbers identify specific characteristics and specifications.

Ratings

Lists electrical and performance ratings including input, output, and frequency details.

Technical Specifications

Lists specifications for display, protections, and environmental operating conditions.

Chapter 2 Mechanical Installation

Installation Environment

Details requirements for working temperature, cooling, and mounting location.

Mounting Orientation and Clearance

Illustrates clearance for multi-drive installations and air guide plate installation.

Installation Method and Procedures

Details preparing the backplate for hole cut-out and installing the drive.

Chapter 3 Electrical Installation

Typical System Connection

Shows a typical system connection diagram with optional components.

Main Circuit Wiring

Details main circuit terminal arrangement and functions.

Main Circuit Wiring

Details grounding (PE) connection requirements and best practices.

Main Circuit Wiring

Covers main circuit cable protection and power input protection.

Control Circuit Wiring

Illustrates control circuit terminal arrangement and lists terminals.

Control Circuit Wiring

Explains wiring for digital inputs in SOURCE mode and wiring for DI5 high-speed pulse input.

Wiring Checklist

Provides a comprehensive checklist for electrical installation.

Chapter 4 Operating Panel (Keypad & Display)

Inbuilt LED Operating Panel

Explains the function of each key on the LED operating panel.

Function Parameter Operations

Discusses editing function parameters and provides a table of often used parameters.

Saving and Restoring Settings

Covers saving parameter values, making backups, and restoring default settings.

Chapter 5 Quick Setup

Setup Flowchart

Details the initial steps of setup, including parameter initialization and setting motor parameters.

Setup Flowchart

Details selecting control mode, frequency reference channels (AI1, AI2), and their settings.

Setup Flowchart

Details setting V/F curve parameters and performing a trial run.

Chapter 6 Description of Parameters

Start/Stop the AC Drive

Describes different start modes like direct start and catching a spinning motor.

Start/Stop Command Source

Details control modes: operating panel, terminal I/O, and serial communication via F0-02.

Terminal I/O Control

Explains three-wire control mode 2, including wiring and sequence diagrams.

Set Frequency Reference

Details four methods to set frequency reference, including main and auxiliary references.

Analog Input

Provides examples for current input at AI2 and voltage input at AI3 for frequency reference.

PID Reference

Shows PID control function block diagrams and PID reference/feedback setting channels.

Main & Auxiliary Calculation

Details F0-07 settings for final frequency reference selection and calculation methods.

Start/Stop the AC Drive

Describes different start modes for the AC drive, including direct start and catching a spinning motor.

Start Mode

Details catching a spinning motor, pre-excited start, and SVC quick start modes.

Stop Mode

Explains stop modes like decelerate to stop and coast to stop, including DC injection braking settings.

Acceleration/Deceleration Time and S-curve Setting

Details acceleration/deceleration time parameters and describes acceleration/deceleration modes.

Motor Auto-tuning

Explains motor auto-tuning methods (static 1, dynamic, static 2) and their applications.

Motor Auto-tuning

Details the steps for dynamic auto-tuning and static auto-tuning 2, including notes on parameter input.

Control Performance

Introduces control performance aspects, starting with V/F curve settings.

V/F Curve

Describes linear V/F curve, user-defined multi-point V/F curve, and variable-torque square V/F curve.

Current Limit Control

Explains how current limit control works during acceleration, running, and deceleration.

Voltage Limit and Braking Unit Applied Voltage

Covers voltage limit functions and braking unit application for preventing overvoltage.

Speed Loop

Details speed loop PI parameters and explains how they affect system response.

Torque Limit

Covers torque limit function for system protection in speed or torque control.

Protections

Introduces protection functions for the AC drive and motor, starting with motor overload protection.

Motor Overload Protection

Details motor overload protection parameters (F9-00, F9-01, F9-02) and inverse time-lag characteristics.

Phase Loss Protection

Explains input and output phase loss protection parameters.

Fault Reset

Covers auto reset times, DO action during auto reset, and delay of auto reset.

Fault Protection Action Selection

Details how to select action modes for different fault types.

Motor Overheat Protection

Explains motor overheat protection settings using temperature sensors.

Power Dip Ride-through

Describes the power dip ride-through function for continuous operation during momentary power loss.

Load Lost Protection

Explains load lost protection function parameters.

Undervoltage & Overvoltage Threshold and Overcurrent Fast Prevention

Output Overcurrent Protection

Monitoring

Process Control

User Programmable Card

Master and Slave Control

Function of the AI Terminals

Function of the AO and Pulse Output Terminals

Communication

Read and Write Function Parameters

Parameter Initialization

Auxiliary Function

Jog

Chapter 7 Interfaces and Communication

About Use of MD500 Terminals

Serial Communication

Modbus Communication Protocol

Describes Modbus-RTU protocol application, bus structure, and data format.

Parameter initialization

Chapter 8 Peripherals and Options

Description of Peripheral Electrical Devices

MCCB, Fuse and Contactor

Braking Unit and Braking Resistor

Explains selection of braking resistor resistance and power, and provides typical braking frequencies for applications.

Braking Unit and Braking Resistor

Extension Cards

Functional Extension Cards

Extension Communication Cards

Extension CANopen Card (MD38CAN2)

Extension RS485 Card (MD38TX1)

Extension PROFIBUS-DP Card (MD38DP2)

Extension PG Cards

Extension Resolver Card (MD38PG4)

Extension Open-collector PG Card (MD38PG5D)

Extension Differential PG Card With Frequency Dividing (MD38PG6, MD38PG6D)

Chapter 9 Technical Data

EMC

Details CE mark implications, European standards, and Low Voltage Directive compliance.

EMC

Covers fuse installation, foreign object prevention, grounding, and EMC guidelines compliance.

dv/dt Reactor Installation

Common-mode Filter

Breaker & Fuse Selection

Shielded Cable

Solutions to Common EMC Interference Problems

De-rating

Explains de-rating based on carrier frequency, ambient temperature, and altitude.

Chapter 10 Maintenance and Inspection

Daily Inspection

Provides detailed safety information and warnings for daily inspection.

Periodic Inspection

Replacement of Wearing Components

Discusses wearing components, their service life, possible causes of failure, and judging criteria.

Chapter 11 Troubleshooting

Safety Information

Provides essential safety information and warnings for troubleshooting.

Troubleshooting During Trial Run

Offers solutions for problems in open-loop vector control, including torque/speed response and motor oscillation.

Troubleshooting During Trial Run

Continues troubleshooting for open-loop vector control and covers issues in V/F control like motor oscillation and overcurrent.

Fault Display

Resetting Fault

Details methods for resetting faults via DI terminal, operating panel, automatic reset, and host computer.

Faults and Diagnostics

Covers troubleshooting for overvoltage and undervoltage conditions.

Faults and Diagnostics

Troubleshoots encoder faults, motor overspeed, motor overtemperature, and braking unit overload.

Symptoms and Diagnostics

Provides troubleshooting for issues like no display, motor not rotating, DI terminals disabled, and speed errors.

Symptoms and Diagnostics

Covers troubleshooting for overcurrent/overvoltage detection and pre-charge relay faults.

Appendix A Parameter Table

Standard Parameters

Lists Fault and Protection (Group F9) parameters.

Standard Parameters