Lenze AC Tech SC Series Bedienungsanleitung

SCF Series Drives

Modbus Communications Reference Guide

This documentation applies to the use of an SCF Series Variable Frequency Drive in a Modbus Network and should

be used in conjunction with the SCF Series Installation and Operation Manual (Document SF01) that shipped with

the drive. These documents should be read in their entirety as they contain important technical data and describe

the installation and operation of the drive.

No part of this documentation may be copied or made available to third parties without the explicit written approval

of Lenze AC Tech Corporation. All information given in this documentation has been carefully selected and tested

for compliance with the hardware and software described. Nevertheless, discrepancies cannot be ruled out. Lenze

AC Tech does not accept any responsibility nor liability for damages that may occur. Any necessary corrections will

be implemented in subsequent editions.

About These Instructions

i RG-SFMOD

Contents

1 Safety Information.............................................................................................................1

1.1 Warnings, Cautions and Notes ..............................................................................1

1.1.1 General ....................................................................................................1

1.1.2 Application ...............................................................................................1

1.1.3 Installation ...............................................................................................1

1.1.4 Electrical Connection................................................................................2

1.1.5 Operation .................................................................................................2

1.2 Reference and Links .............................................................................................2

2 Introduction.......................................................................................................................3

2.1 Modbus Details.....................................................................................................3

2.2 Universal Registers ...............................................................................................4

3 Data Representation - Internal and External.......................................................................5

3.1 Register Format ....................................................................................................5

3.2 Data Types ...........................................................................................................5

3.3 AC Tech Drive Registers........................................................................................5

4 SCF Drive Setup & Operation.............................................................................................6

4.1 Serial Address ......................................................................................................6

4.2 Serial Communications Parameter ........................................................................6

4.3 Control Parameter.................................................................................................6

4.4 Unlocking & Locking Controls ...............................................................................7

4.5 Unlocking & Locking Programming Parameters only .............................................7

4.6 Watchdog Timer ...................................................................................................8

4.7 Monitoring Only Operation ....................................................................................8

4.8 Normal Control Operation Sequence .....................................................................8

4.9 Start/Stop, Speed Control and Parameter Change Operation .................................9

RG-SFMOD ii

Contents

5 SCF Drive Control Registers...............................................................................................10

5.1 Abbreviations........................................................................................................11

5.2 Drive Control - Register #1....................................................................................11

5.3 Drive Hardware Conﬁguration - Register #22 ........................................................12

5.4 Drive Status - Registers #24-29............................................................................13

5.4.1 Reading Register #24...............................................................................13

5.4.2 Operational Status - Register #26.............................................................14

5.4.3 Actual Rotational Direction - Registers #24 & 27 ......................................14

5.4.4 Control Mode - Registers #24 & 27 ..........................................................14

5.4.5 Speed Command Source - Registers #24 & 28.........................................15

5.4.6 Auto/Manual Status - Registers #24 & 28.................................................15

5.4.7 Present Fault - Registers #24 & 29...........................................................16

5.4.8 Commanded Rotational Direction - Registers #24 & 29 ............................16

5.5 Motor Volts - Register #30 ....................................................................................17

5.6 Keypad Speed - Register #40 ...............................................................................17

5.7 Unlock Commands - Register #48.........................................................................17

5.8 Unlock Parameters - Register #49 ........................................................................17

5.9 Register Version....................................................................................................17

6 SCF Programming Parameters ..........................................................................................18

6.1 Format..................................................................................................................18

6.2 Parameter List ......................................................................................................19

7 Quick Start Instructions .....................................................................................................25

7.1 Initial Settings.......................................................................................................25

7.2 Drive Control.........................................................................................................26

7.3 Basic Drive Commands.........................................................................................26

7.4 Basic Drive Status.................................................................................................27

7.5 Basic Drive Network Programming........................................................................27

1 RG-SFMOD

Safety Information

1 Safety Information

1.1 Warnings, Cautions and Notes

1.1.1 General

Some parts of Lenze controllers (frequency inverters, servo inverters, DC controllers) can be live, moving

and rotating. Some surfaces can be hot.

Non-authorized removal of the required cover, inappropriate use, and incorrect installation or operation

creates the risk of severe injury to personnel or damage to equipment.

All operations concerning transport, installation, and commissioning as well as maintenance must be

carried out by qualiﬁed, skilled personnel (IEC 364 and CENELEC HD 384 or DIN VDE 0100 and IEC report

664 or DIN VDE0110 and national regulations for the prevention of accidents must be observed).

According to this basic safety information, qualiﬁed skilled personnel are persons who are familiar with

the installation, assembly, commissioning, and operation of the product and who have the qualiﬁcations

necessary for their occupation.

1.1.2 Application

Drive controllers are components designed for installation in electrical systems or machinery. They are

not to be used as appliances. They are intended exclusively for professional and commercial purposes

according to EN 61000-3-2. The documentation includes information on compliance with EN 61000-3-2.

When installing the drive controllers in machines, commissioning (i.e. the starting of operation as directed)

is prohibited until it is proven that the machine complies with the regulations of the EC Directive 98/37/EC

(Machinery Directive); EN 60204 must be observed.

Commissioning (i.e. starting drive as directed) is only allowed when there is compliance to the EMC

Directive (2004/108/EC).

The drive controllers meet the requirements of the Low Voltage Directive 2006/95/EC. The harmonised

standards of the series EN 50178/DIN VDE 0160 apply to the controllers.

The availability of controllers is restricted according to EN 61800-3. These products can cause

radio interference in residential areas. In the case of radio interference, special measures may be

necessary for drive controllers.

1.1.3 Installation

Ensure proper handling and avoid excessive mechanical stress. Do not bend any components and do not

change any insulation distances during transport or handling. Do not touch any electronic components

and contacts. Controllers contain electrostatically sensitive components, which can easily be damaged by

inappropriate handling. Do not damage or destroy any electrical components since this might endanger

your health! When installing the drive ensure optimal airﬂow by observing all clearance distances in the

drive's user manual. Do not expose the drive to excessive: vibration, temperature, humidity, sunlight, dust,

pollutants, corrosive chemicals or other hazardous environments.

RG-SFMOD 2

Safety Information

1.1.4 Electrical Connection

When working on live drive controllers, applicable national regulations for the prevention of accidents (e.g.

VBG 4) must be observed.

The electrical installation must be carried out in accordance with the appropriate regulations (e.g.

cable cross-sections, fuses, PE connection). Additional information can be obtained from the regulatory

documentation.

The regulatory documentation contains information about installation in compliance with EMC (shielding,

grounding, ﬁlters and cables). These notes must also be observed for CE-marked controllers.

The manufacturer of the system or machine is responsible for compliance with the required limit values

demanded by EMC legislation.

1.1.5 Operation

Systems including controllers must be equipped with additional monitoring and protection devices according

to the corresponding standards (e.g. technical equipment, regulations for prevention of accidents, etc.).

You are allowed to adapt the controller to your application as described in the documentation.

DANGER!

• After the controller has been disconnected from the supply voltage, do not touch the live components and power

connection until the capacitors have discharged. Please observe the corresponding notes on the controller.

• Do not continuously cycle input power to the controller more than once every three minutes.

• Close all protective covers and doors during operation.

WARNING!

Network control permits automatic starting and stopping of the inverter drive. The system design must incorporate adequate

protection to prevent personnel from accessing moving equipment while power is applied to the drive system.

Table 1: Pictographs used in these instructions

Pictograph Signal word Meaning Consequences if ignored

DANGER! Warning of Hazardous Electrical

Voltage.

Reference to an imminent danger that may

result in death or serious personal injury if the

corresponding measures are not taken.

WARNING! Impending or possible danger

for persons

Death or injury

STOP! Possible damage to equipment Damage to drive system or its surroundings

NOTE Useful tip: If observed, it will

make using the drive easier

1.2 Reference and Links

SCF Series Variable Frequency Drives visit: http://www.lenze-actech.com

Modbus-IDA visit: http://www.modbus-IDA.org

3 RG-SFMOD

Introduction

2 Introduction

This document deﬁnes the speciﬁcs required for Modbus serial communication with a Lenze-AC Tech

standard SCF Series drives for control, status monitoring, and programming parameters. A familiarity

with normal drive capabilities and operations is assumed. If this is not the case, refer to the SCF Series

Installation and Operation manual (SF01) for more information.

2.1 Modbus Details

A. AC Tech Drives running the Modbus communication protocol use the RTU (Remote Terminal Unit)

transmission mode and are slaves only. Therefore, the device communicating with the drives must be

a Modbus Master. The baud rate is 9600, no parity (two stop bits). There are provisions for Odd parity

1 stop bit and Even parity 1 stop bit as well. The bit sequence is:

DATA

Start bit 1 2 3 4 5 6 7 8 Stop bit Stop bit

B. At this time the AC Tech drives do not support the broadcast function of the protocol.

C. IMPORTANT NOTE: Modbus 3X and 4X Registers are numbered starting at 1. However, when

transmitted to a slave over the serial link, the actual address transmitted is one less. This is because

the addresses are numbered starting from 0. AC Tech register numbers are also numbered starting

from 0. Therefore, AC Tech register numbers always correspond exactly with the address transmitted.

As a result, MODBUS REGISTER NUMBERS ARE ALWAYS ONE GREATER THAN AC TECH REGISTER

NUMBERS. WHENEVER THE WORDS “REGISTER #xx” APPEAR, IT SHOULD BE ASSUMED THAT THEY

MEAN “AC TECH REGISTER xx” and the Modbus Register number will be one larger. In some instances

we may show both for clarity. For example: “Register #24 (Modbus Register #25) . . .”

D. The function codes supported by AC Tech drives are:

03 Read Holding Registers (4X references). In general we can read only one register at a time. However,

there are a few limited exceptions.

Exception One:

Exception Two:

AC Tech uses a method of reading a group of related registers that may not be consecutive within

the drive memory map. When this is done for the registers below, the response from the drive will

be for the number of words requested but will not be with consecutive registers.

04 Read Input Registers (3X references). As with function 03, we read one register at a time except

where noted.

RG-SFMOD 4

Introduction

06 Preset Single Register (4X references). Write single register.

16 Preset Multiple Registers (4X references). Although the function is for multiple registers, we will

accept only a single register to be written.

Note: Since we do not differentiate between 4X and 3X references, function codes 03 and 04 are

treated identically.

E. Exception codes:

01 - Command rejected, Illegal function

02 - No such register

03 - Data out of range

04 - Wrong data format

06 - Slave device busy. Registers cannot be written while the drive is in keypad programming mode.

F. The AC Tech drive will most nearly conform to the Modicon®Micro 84 in capabilities. This may be of

importance when conﬁguring networks for DDE Servers.

G. Modbus®and Modicon®are registered trademarks of Schneider Electric. For more information about

the Modbus Protocol please refer to the Modicon Modbus Protocol Reference Guide. Web resources:

http://www.Modbus-IDA.org and http://www.schneider-electric.com.

2.2 Universal Registers

Lenze-AC Tech manufactures several drive families. Currently the QC, MC, MCH, SC, TC,

smd

Tmd

and SMV

Series drives support Modbus based communications. Since each drive family has different parameters

and size ranges, the parameter (register) deﬁnitions are in many cases quite different. In order to facilitate

communication in a network with a mix of drive types, certain AC Tech Register locations have been made

universal among AC Tech drives. While their locations are consistent, their contents may vary as deﬁned

in Table 2.

Table 2: Contents of Universal Registers

AC Tech Reg # Function

1 Drive Control (WRITE ONLY). Not all drives will have all control functions but when the function is

available it will be at a deﬁned bit location within Register #1. Drive Family and register Conﬁguration

Number dependent.

19 Drive Family (READ ONLY) This register is CONSISTENT AMONG ALL AC TECH DRIVES:

- 64 -- QC family - 67 -- - 70 -- TCF family

- 65 -- MC family - 68 -- MCH family - 71 --

Tmd

family

- 66 -- SCF family - 69 --

smd

family - 72 -- SMV family

21 Drive Size (READ ONLY). Code to identify Power (HP/KW) and Line Voltage of the drive. Family

dependent. For the SC series it always reads zero.

24 Drive Status (READ ONLY). Various operational variables.

48 Unlock Control (WRITE ONLY).

49 Unlock Writing of registers (WRITE ONLY).

50 Parameter Conﬁguration Number (READ ONLY).

5 RG-SFMOD

Data & Register Format

3 Data Representation - Internal and External

3.1 Register Format

All registers are 16 bits. The data within these registers can take on the following forms:

• Individual bit commands (16 per register).

Example: Register #1 (Modbus Register #2).

• Individual bit ﬂags (16 per register).

Example: Register #22.

• A chain of two 8 bit unsigned integers.

• A 16 bit unsigned integer.

This unsigned integer could in turn represent many different types of data with various scaling

rules and units, which are deﬁned by the DATA TYPE of the register.

3.2 Data Types

Data passed in registers across the Modbus communications link are always in INTERNAL units. The drive

itself may show the information in alternate DISPLAYED units. For Example: drive speeds are always stored

internally as tenths of a Hz but the drive may display that speed in whole Hz by dropping the tenth using

programmed conversion factors. Table 3 lists examples of the internal units used on the SCF series.

Table 3: SCF Series Internal Units

Type Unit Example

SPEED .1Hz 60Hz = 600

TIME .1Sec 30.0Sec = 300

3.3 AC Tech Drive Registers

Registers #0 through #50: (Modbus Registers #1 to #51) Reserved for conﬁguration and control

Registers #51 through #255 (Modbus Registers #52 to #256) Reserved for the drives’ programming

mode parameters. Programming Mode Parameters are the parameters

that can be accessed from the local keypad on the drive. There is a direct

correspondence between the SCF Drive Programming Mode Parameter

number and the AC Tech Register number (and consequently, the

Modbus register number):

AC Tech Register # = (SCF Programming Parameter #) + 50

Modbus Register # = (SCF Programming Parameter #) + 51

The entries in Table 5 are based on SCF Drive Software # 213-064 Revision 03 (Parameter Conﬁguration =

312). If a later revision of software were to change register deﬁnitions, drive operation could be seriously

affected. This will be identiﬁed for a given drive by examining Register #50 (Parameter Conﬁguration

Number). The number displayed at power up on drive display can also identify it. If it is not 312, writing to

any register on the drive MUST NOT BE ATTEMPTED unless your Controller has been setup to support the

new conﬁguration.

RG-SFMOD 6

Drive Setup & Operation

4 SCF Drive Setup & Operation

4.1 Serial Address

All AC Tech drives have a Serial Address Parameter that must be programmed prior to attempting to

operate the serial interface (Programming Parameter #43 / AC Tech Register #93).

4.2 Serial Communications Parameter

All AC Tech drives have a Serial Communications Parameter that governs the operation of the Serial Link.

On SCF drives this is #15 SERIAL LINK (register #65). Table 4 lists the selections for SC Parameter 15,

SERIAL LINK.

Table 4: SCF Parameter 15 Selections

Setting Description Watchdog Timeout Period

1 DISABLE

2 9600,N,2 WITH TIMER 10 sec

3 9600,N,2 WITHOUT TIMER

4 9600,E,1 WITH TIMER 10 sec

5 9600,E,1 WITHOUT TIMER

6 9600,O,1 WITH TIMER 10 sec

7 9600,O,1 WITHOUT TIMER

Explanation of Terms:

• DISABLED serial link not operational

• WITH TIMER serial link allows reading & writing of both control & programming parameters.

Watchdog timer is enabled (refer to section 4.6,

Watchdog Timer

• WITHOUT TIMER serial link allows reading & writing of both control & programming parameters.

Watchdog timer is disabled (refer to section 4.6,

Watchdog Timer

The Serial Communications Parameter must be appropriately programmed prior to attempting to

communicate with the drive.

4.3 Control Parameter

Programming parameter #14 (control) must be programmed to 01 (terminal strip only). Serial operation will

not work correctly if 02 (remote keypad only) or 03 (terminal strip or remote keypad) are selected.

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