ABB FMBA-01 Bedienungsanleitung

ABB Drives

User’s Manual

Modbus Adapter Module

FMBA-01

Modbus Adapter Module

FMBA-01

User’s Manual

3AFE68586704 REV A EN

EFFECTIVE: 27.06.2005

Safety instructions

Overview

This chapter states the general safety instructions that must be

followed when installing and operating the FMBA-01 Modbus

Adapter module.

The material in this chapter must be studied before attempting any

work on, or with, the unit.

In addition to the safety instructions given below, read the

complete safety instructions of the specific drive you are working

on.

General safety instructions

WARNING! All electrical installation and maintenance work on the

drive should be carried out by qualified electricians.

The drive and adjoining equipment must be properly earthed.

Do not attempt any work on a powered drive. After switching off

the mains, always allow the intermediate circuit capacitors 5

minutes to discharge before working on the frequency converter,

the motor or the motor cable. It is good practice to check (with a

voltage indicating instrument) that the drive is in fact discharged

before beginning work.

The motor cable terminals of the drive are at a dangerously high

voltage when mains power is applied, regardless of motor

operation.

There can be dangerous voltages inside the drive from external

control circuits even when the drive mains power is shut off.

Exercise appropriate care when working on the unit. Neglecting

these instructions can cause physical injury or death.

Table of contents

Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Before you start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

What this manual contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Terms used in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

RS-485 standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

The FMBA-01 Modbus Adapter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Delivery check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Mechanical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

General cabling instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

RS-485 connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Bus termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table of contents

Technical data and diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

FMBA-01 Modbus Adapter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

RS-485 link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

LED indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Introduction

Intended audience

The manual is intended for the people who are responsible for

commissioning and using an FMBA-01 Modbus Adapter module.

The reader is expected to have a basic knowledge of electrical

fundamentals, electrical wiring practices and how to operate the

drive.

Before you start

It is assumed that the drive is installed and ready to operate before

starting the installation of the extension module.

In addition to conventional installation tools, have the drive

manuals available during the installation as they contain important

information not included in this manual. The drive manuals are

referred to at various points of this document.

What this manual contains

This manual contains information on the wiring, configuration and

use of the FMBA-01 Modbus Adapter module.

Safety instructions are featured on the first few pages of this

manual.

Overview contains a short description of the RS-485 standard

and the FMBA-01 Modbus Adapter module and a delivery

checklist.

Mechanical installation contains placing and mounting

instructions for the module.

Electrical installation contains wiring, bus termination and

earthing instructions.

Introduction

Technical data and diagnostics contains information on physical

dimensions and connectors of the module and the specification of

the RS-485 link. It also explains how to trace faults with the status

LEDs on the FMBA-01 Modbus Adapter module.

Terms used in this manual

Communication Module

Communication Module is a name for a device (e.g. a fieldbus

adapter) through which the drive is connected to an external

communication network (e.g. a fieldbus). The communication with

the module is activated with a drive parameter.

FMBA-01 Modbus Adapter module

The FMBA-01 Modbus Adapter module is one of the optional

fieldbus adapter modules available for ABB drives. The FMBA-01

is a device through which an ABB drive is connected to a RS-485

network.

Overview

This chapter contains a short description of the RS-485 standard

and the FMBA-01 Modbus Adapter module, and a delivery

checklist.

RS-485 standard

RS-485 is a serial interface standard for communication over a

twisted-pair cable. Because the RS-485 signal transmission is

differential, it provides better protection against noise and longer

transmission distances than the RS-232. RS-485 is a half-duplex

multi-drop network, which means that multiple devices may reside

on line. Only one transmitter may be active at any given time.

The RS-485 standard specifies only the electrical characteristics

of the bus system. The communication protocol and

communication speed depend on the used application. For

example the electrical characteristics of the PROFIBUS and

MODBUS are based on the RS-485 standard.

The RS-485 transmission line consists of two wires, A and B. The

signal transmission is based on the voltage difference between

the wires. Minimum detected voltage difference is 200 mV. The

potential difference between the two wires determines the logic

state bit: when B is at higher voltage than A, the state is defined as

bit 1 (data high) and when A is at higher voltage than B, the state

is defined as bit 0 (data low).

The common mode voltage between RS-485 network devices is

limited to -5...+12 V. Ground wire and cable shield should be

connected to prevent common mode voltage between the network

devices from drifting outside the allowable limits.

Overview

RS-485 bus cable should be terminated with a 120 ohm resistor

on both ends to prevent signal reflection. When no device on the

network is transmitting, noise can be falsely interpreted as

communication data. To avoid this, termination can be included

with a fail-safe circuit (pull-up and pull-down resistors). The circuit

forces the bus into a known idle state when no device is

transmitting.

The FMBA-01 Modbus Adapter module

The FMBA-01 Modbus Adapter module is an optional device for

ABB drives which enables the connection of the drive to a RS-485

network. The FMBA-01 provides galvanic isolation between the

drive and RS-485 network and converts serial communication

signals of the drive to RS-485 signal levels.

The FMBA-01 has a built-in bus termination with fail-safe circuitry.

The termination can be activated with a jumper.

The adapter module is mounted into an option slot on the motor

control board of the drive. See the drive documentation for module

placement options.

Bus connector X1

(see chapter Electrical installation)

Diagnostic LEDs

(See chapter LED indications)

Other

RS-485

device

ABB drive Other

RS-485

device

Construction of the RS-485 network and the FMBA-01

Termination jumper J1

(See chapter Electrical installation)

Overview

Compatibility

The FMBA-01 Modbus Adapter module is compatible with all

stations that comply with RS-485.

Delivery check

The option package for the FMBA-01 Modbus Adapter module

contains:

• Modbus Adapter module, type FMBA-01

• this manual.

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