Lenze MCH Series User Manual

MCH Series Drives

Modbus Communications Reference Guide

About These Instructions

This documentation applies to the use of an MCH Series Variable Frequency Drive in a Modbus Network and should be used in conjunction with the MCH Series Installation and Operation Manual (Document MH01) 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.

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 MCH 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 .............................................8

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

4.7 Monitoring Only Operation ....................................................................................9

4.8 Normal Control Operation Sequence .....................................................................9

4.9 Start/Stop, Speed Control and Parameter Change Operation .................................10

i RG-MHMOD

Contents

5 MCH Drive Control Registers .............................................................................................11

5.1 Abbreviations ........................................................................................................12

5.2 Drive Control - Register #1....................................................................................13

5.3 Drive Size - Register #21 ......................................................................................14

5.4 Drive Status - Registers #24-29 ............................................................................14

5.4.1 Operational Status - Register #24 & 26 ....................................................15

5.4.2 Actual Rotational Direction - Registers #24 & 27 ......................................15

5.4.3 Control Mode - Registers #24 & 27 ..........................................................16

5.4.4 Speed Command Source - Registers #24 & 28 .........................................16

5.4.5 Auto/Hand Status - Registers #24 & 28 ....................................................16

5.4.6 Present Fault - Registers #24 & 29 ...........................................................17

5.4.7 Commanded Rotational Direction - Registers #24 & 29 ............................17

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

5.6 Kilowatt Hours - Registers #32 & 33 .....................................................................18

5.7 Keypad Speed - Register #40 ...............................................................................18

5.8 Total Run Time - Registers #36 & 37 ....................................................................18

5.9 PID Commands - Registers #38, 39, 41 & 43 ........................................................18

5.10 Serial Speed Command - Register #42 .................................................................18

5.11 Unlock Commands - Register #48 .........................................................................19

5.12 Unlock Parameters - Register #49 ........................................................................19

5.13 Register Version ....................................................................................................19

6 MCH Programming Parameters .........................................................................................20

6.1 Format ..................................................................................................................20

6.2 Parameter List ......................................................................................................21

7 Quick Start Instructions .....................................................................................................26

7.1 Initial Settings .......................................................................................................26

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

7.3 Basic Drive Commands .........................................................................................27

7.4 Basic Drive Status .................................................................................................28

7.5 Basic Drive Network Programming ........................................................................28

RG-MHMOD ii

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

Safety Information

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.

1 RG-MHMOD

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.

Safety Information

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!

STOP!

NOTE

Warning of Hazardous Electrical

Voltage.

Impending or possible danger

for persons

Possible damage to equipment Damage to drive system or its surroundings

Useful tip: If observed, it will

make using the drive easier

Reference to an imminent danger that may

result in death or serious personal injury if the

corresponding measures are not taken.

Death or injury

1.2 Reference and Links

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

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

RG-MHMOD 2

2 Introduction

This document deﬁnes the speciﬁcs required for Modbus serial communication with a Lenze-AC Tech standard MCH 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 MCH Series Installation and Operation manual (MH01) 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). The bit sequence is:

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) . . .”

Introduction

DATA

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: Register #24 (Modbus Register #25) Drive Status, can also be read as a group of 6 words.

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.

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

3 RG-MHMOD

Introduction

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. In Keypad Programming mode, cannot write registers.

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, 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.

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 -- TC family

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

- 66 -- SC family - 69 --

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

dependent. For the MCH series refer to section 5.3.

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).

Table 2: Contents of Universal Registers

Tmd

smd

family - 72 -- SMV family

family

smd, Tmd

and SMV

RG-MHMOD 4

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 #1.

• A chain of two 8 bit unsigned integers.

• A 16 bit unsigned integer.

This unsigned integer could 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 hundredths of a Hz but the drive may display that speed in terms of RPM's using programmed conversion factors. Table 3 lists examples of the internal units used on the MCH series.

The data type "PID" requires further explanation. The internal range of any data of PID type is 0 to 32736. Many variables can be controlled in a PID system (pressure, temperature, ﬂow, etc.). To simplify drive calculation, the drive programmer enters the type and range of the controlled variable (actually it is the range of the feedback device that we are scaling) and this range is mapped to the internal range (0-32736). If the feedback device measured 0 to 200 PSI, then 0 PSI is 0 internal units, and 200 PSI is 32736 internal units. To command a setpoint of 100 PSI the LOCAL PID command (Register #41) can be written with the value 16368 (32736*100/200). Thus to control PID operations using real world units, the Modbus Master must have knowledge of the range of the feedback device.

3.3 AC Tech Drive Registers

Registers #0 - #50: (Modbus Reg #1 - #51) Reserved for conﬁguration and control Registers #51 - #260 (Modbus Reg #52 - #261) Reserved for drive's programming mode parameters Programming Mode Parameters are the parameters accessible from the local keypad on the drive. There is a direct correspondence between the MCH Drive Programming Mode Parameter number and the AC Tech Register number (and consequently, the Modbus register number):

Table 3: MCH Series Internal Units

Type Unit Example

SPEED 0.01 Hz 60 Hz = 6000

TIME 0.1 Sec 30.0 Sec = 300

AC Tech Register # = (MH Programming Parameter #) + 51 Modbus Register # = (MH Programming Parameter #) + 52

The Table 6 entries are based on MCH Drive Software # 213-070 Revision 00 (Parameter Conﬁguration = 148). If a later revision of software were to change register deﬁnitions, drive operation could be seriously affected. Examine Register #50 (Parameter Conﬁguration Number) for revision. The number displayed at power up on drive display also identiﬁes it. If it is not 148, writing to any register on the drive MUST NOT BE ATTEMPTED unless your Controller has

been setup to support the new conﬁguration.

5 RG-MHMOD

Drive Setup & Operation

4 MCH 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 #58 / AC Tech Register #109).

4.2 Serial Communications Parameter

All AC Tech drives have a Serial Communications Parameter that governs the operation of the Serial Link. On MCH drives this is #57 SERIAL LINK (register #108). Table 4 lists the selections for MCH Parameter 57, SERIAL LINK.

Table 4: MCH Parameter 57 Selections

Setting Description Watchdog Timeout Period

00 DISABLE

01 WITH TIMER 10 sec

02 WITHOUT TIMER

Explanation of Terms:

• DISABLED serial link not operational (this is the drive's default setting)

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

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

Prior to attempting to communicate with the drive, Serial Communications Parameter must be appropriately programmed.

4.3 Control Parameter

The Control Parameter on MCH drives (Programming Parameter #30 / AC Tech Register #81) determines how much control a user has over a drive via the serial link. The Control Parameter must be appropriately programmed for a particular application. Refer to the MCH Series Installation and Operation Manual (MH01) for a detailed explanation on programming the drive parameters.

Watchdog timer is enabled (refer to section 4.6,

Watchdog timer is disabled (refer to section 4.6,

Table 5: Control (Parameter 30)

Setting Description

00 NORMAL (default)

01 NORM NO HAND

02 SERIAL SPEED

03 S SPD / NO HAND

04 SERIAL AUTO

05 S AUTO / NO HAND

Watchdog Timer

RG-MHMOD 6

+ 23 hidden pages