Lenze AC Tech MCH Series Reference Manual
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Lenze AC Tech MCH Series Reference Manual

Modbus communications
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MCH Series Drives
Modbus Communications Reference Guide

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Summary of Contents for Lenze AC Tech MCH Series

  • Page 1 MCH Series Drives Modbus Communications Reference Guide...
  • Page 2 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.

  • Page 3: Table Of Contents

    Contents 1 Safety Information ......................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 Reference and Links .....................2 2 Introduction ........................3 Modbus Details .....................3 Universal Registers ....................4 3 Data Representation - Internal and External ...............5 Register Format ....................5 Data Types ......................5 AC Tech Drive Registers..................5...
  • Page 4 Contents 5 MCH Drive Control Registers .....................11 Abbreviations ......................12 Drive Control - Register #1..................13 Drive Size - Register #21 ..................14 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 &...

  • Page 5: Safety Information

    Safety Information Safety Information 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.

  • Page 6: Electrical Connection

    STOP! Possible damage to equipment Damage to drive system or its surroundings NOTE Useful tip: If observed, it will make using the drive easier Reference and Links MCH Series Variable Frequency Drives visit: http://www.lenze-actech.com Modbus-IDA visit: http://www.modbus.org RG-MHMOD...

  • Page 7: Introduction

    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.

  • Page 8: Universal Registers

    - 72 -- SMV family 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. Drive Status (READ ONLY). Various operational variables. Unlock Control (WRITE ONLY).

  • Page 9: Data Representation - Internal And External

    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. Table 3: MCH Series Internal Units...

  • Page 10: Mch Drive Setup & Operation

    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.

  • Page 11: Unlocking & Locking Controls

    Drive Setup & Operation • Setting the control parameter to “NORMAL” or “NORM NO HAND” gives the user read/write access to the Program Parameters but prevents them from writing to any of the control registers. • Setting the control parameter to “SERIAL SPEED” or “S SPD / NO HAND” maintains the user’s read/ write access to the Program parameters but also gives the user write access to all control registers except for SERIAL START.

  • Page 12: Unlocking & Locking Programming Parameters Only

    Drive Setup & Operation Unlocking & Locking Programming Parameters only Registers #49 and #1 are used in Unlocking and Locking Programming Parameters. • Writing to any writeable register other than #1 can be enabled by writing the Drive’s Programming Password to Register #49 (Unlock Parameters). This would be done when Drive Control (start, forward/ reverse, keypad speed control, etc.) is not required.

  • Page 13: Monitoring Only Operation

    Drive Setup & Operation − A Watchdog failure can be recognized by reading the drive status (AC Tech Registers #24 – 29) and looking at the control mode. If it has reverted from SERIAL to LOCAL without the Modbus Master commanding it via Register #1 bit 1 (LOCK) then a watchdog failure has occurred.

  • Page 14: Start/Stop, Speed Control And Parameter Change Operation

    Drive Control & Communication Start/Stop, Speed Control and Parameter Change Operation The typical sequence for a Start/Stop, Speed Control or Parameter Change operation is listed herein. 1. Power up drive with serial enabled. 2. Unlock Controls and Parameters by writing the current programming password (default 19) to Register #48.

  • Page 15: Mch Drive Control Registers

    Drive Control & Communication MCH Drive Control Registers Table 6 describes the MCH Drive Control Registers in ascending order of AC Tech Register #. The HEX representation is given in parenthesis next to the AC Tech Register # in the left-most column. Table 6: MCH Drive Control Registers [NOTE] REGISTER NAME...

  • Page 16: Abbreviations

    Drive Control & Communication [NOTE] REGISTER NAME MESSAGE UNITS Section CRCH CRCL CRCH CRCL 40 (28) Keypad Speed Command 65000 0.01 Hz CRCH CRCL CRCH CRCL CRCH CRCL CRCH CRCL 41 (29) Local PID Command Refer to Section 5.9 CRCH CRCL CRCH CRCL...

  • Page 17: Drive Control - Register #1

    The MC Series drives return 65 (41H) The TC Series drives return 70 (46H) The SC Series drives return 66 (42H) The Tmd Series drives return 71 (47H) The MCH Series drives return 68 (44H) The SMV Series drives return 72 (48H) RG-MHMOD...

  • Page 18: Drive Size - Register #21

    Drive Control & Communication Drive Size - Register #21 Table 9 lists the MCH Series drives. Register 21 will contain the value in the "Size" column. The drives are listed in ascending order by the "Size" number. Table 9: Drive Size - Register #21...

  • Page 19: Operational Status - Register #24 & 26

    Drive Control & Communication NOTE 3a - Command Speed (Register #24 Bytes D1H and D1L or Register #25) • In hundredths of a Hz • Most significant byte is first, followed by Least significant • Example: 02 01 in hex converts to 5.13Hz in decimal. NOTE 3b - Actual Speed (Register #24 Bytes D2H and D2L or Register #25) •...

  • Page 20: Control Mode - Registers #24 & 27

    Drive Control & Communication 5.4.3 Control Mode - Registers #24 & 27 Table 13 lists the Control Mode (Register #24 byte D4L or Register #27 DL). Table 13: Control Mode Setting Control HAND AUTO SERIAL 5.4.4 Speed Command Source - Registers #24 & 28 Table 14 lists the Speed Command Source (Register #24 byte D5H or Register #28 DH).

  • Page 21: Present Fault - Registers #24 & 29

    Drive Control & Communication 5.4.6 Present Fault - Registers #24 & 29 Table 16 lists the Present Fault (Register #24 byte D6H or Register #29 DH) Table 16: Present Fault Setting Fault Display NO FAULT OUTPUT (TRANSISTOR) FAULT OUTPUT Reserved HIGH DC BUS VOLTAGE HI VOLTS HIGH DRIVE TEMPERATURE...

  • Page 22: Kilowatt Hours - Registers #32 & 33

    Drive Control & Communication Kilowatt Hours - Registers #32 & 33 Kilowatt hours are listed as a 32-bit value. Register #32 - Kilowatt Hours Low Word Register #33 - Kilowatt Hours High Word Formula: (High Word x 65536) + Low Word = Total kWh (Kilowatt hours) Keypad Speed - Register #40 This register enables the user to set the keypad speed to desired value.

  • Page 23: 5.11 Unlock Commands - Register #48

    Drive Control & Communication 5.11 Unlock Commands - Register #48 Register #48 (Unlock Commands) unlocks commands by using 0000 for the password. If the correct Programming mode password is entered then the appropriate programming parameters can also be accessed (refer to the full parameter protocol specification if access to programming parameters is required).

  • Page 24: Mch Programming Parameters

    Drive Control & Communication MCH Programming Parameters Format NOTE - Attention Parameter list presented in Section 6.2 is valid only for MCH Software 213-070 revision 00. For revisions, refer to appropriate MCH Manual (MH01). Abbreviations: (1byte) drive address (1-247) (1byte) register address (2bytes) Cyclic Redundancy Check READING: Message structure for reading 1 word: (most of parameters)

  • Page 25: Parameter List

    Drive Control & Communication Parameter List AC Tech Parameter Name Range of Adjustment Factory Default Register Modbus value (decimal value) Number (hexadecimal representation) 51 (33) LINE VOLTS 00 - High 02 - Auto 01 - Low 02 - Auto 52 (34) SPEED #1 Min.
  • Page 26 Drive Control & Communication AC Tech Parameter Name Range of Adjustment Factory Default Register Modbus value (decimal value) Number (hexadecimal representation) 77 (4D) STOP 00 - Ramp 00 - Coast 01 - Coast 79 (4F) SPEED SRC KEY 00 - Enabled 00 - Enabled 01 - Disabled 80 (50)
  • Page 27 Drive Control & Communication AC Tech Parameter Name Range of Adjustment Factory Default Register Modbus value (decimal value) Number (hexadecimal representation) 95 (5F) TB10B OUT 00 - None 00 - None 01 - 0 - 10 VDC 02 - 2 - 10 VDC 96 (60) @TB10B 10 - 200 (10 - 200%)
  • Page 28 Drive Control & Communication AC Tech Parameter Name Range of Adjustment Factory Default Register Modbus value (decimal value) Number (hexadecimal representation) 115 (73) MONITOR 00 - OFF 01 - ON 01 - ON 116 (74) PROGRAM 00 - Maintain 01 - Reset 60 01 - Reset 60 02 - Reset 50 117 (75)
  • Page 29 Drive Control & Communication NOTE 4 - Acceleration Limits Acceleration Limits Adjustment Range 0.25 - 20 1 - 36000 (0.1 - 3600 sec) 25 - 60 3 - 36000 (0.3 - 3600 sec) 75 - 250 6 - 36000 (0.6 - 3600 sec) NOTE 5 - Deceleration Limits Deceleration Limits Adjustment Range...

  • Page 30: Quick Start Instructions

    Tech Technical Library at http://www.lenze-actech.com. Initial Settings 1. Set the Modbus Master to 9600 bps with 8 data bits, no parity and 2 stop bits. The MCH series drive does NOT support any other baud rates or data formats. 2. Set Parameter 58 (Serial Address) to the desired network address that the Modbus master will poll.

  • Page 31: Basic Drive Commands

    2. To Start the drive write a value of 0008hex to Modbus register 40002. 3. Drive direction cannot be contolled via Modbus on the MCH series drive. 4. If you want the network to control the speed of the drive, set Parameter 24 (Auto Source) to KEYPAD and write the speed to the Keypad Speed Command Register, Modbus register 40041 (AC Tech register 40).

  • Page 32: Basic Drive Status

    Drive Control & Communication Basic Drive Status AC Tech register 24 is a 6 word entity containing the drive’s status information. To retrieve the entire status block (Modbus registers 24-29) send a read command to Modbus register 40025 using Modbus function code 03 with a register count of 6.
  • Page 33 Lenze AC Tech Corporation 630 Douglas Street • Uxbridge MA 01569 • USA Sales: 800-217-9100 •Service: 508-278-9100 www.lenze-actech.com RG-MHMOD-e7...

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