Danfoss VLT 2800 Series Operating Instructions Manual
Modbus rtu
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- General information manual (120 pages) ,
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Contents
MG.10.S1.22 - VLT is a registered Danfoss trademark
VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
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Introduction ............................................................................................................
About This Manual .................................................................................................
Assumptions ..........................................................................................................
What You Should Already Know .............................................................................
Modbus RTU Overview ..........................................................................................
VLT 2800 and VLT 6000 with Modbus RTU ............................................................
Hardware Setup VLT 2800 .....................................................................................
Hardware Setup VLT 6000 .....................................................................................
EMC Precautions ...................................................................................................
VLT 2800 Parameter Settings for Modbus Communication .....................................
VLT 6000 Parameter Settings for Modbus Communication ..................................... 11
Remote Terminal Unit ............................................................................................. 13
Modbus RTU Message Framing Structure .............................................................. 13
Parameter Handling ................................................................................................ 16
Translation from Modbus RTU Protocol to FC Protocol ........................................... 16
Register Maps VLT 2800 ........................................................................................ 17
Register Maps VLT 6000 ........................................................................................ 18
Process Data ......................................................................................................... 19
Status Coil Maps .................................................................................................... 19
Control Word Bit Descriptions for VLT 2800 ............................................................ 19
Status Word Bit Description for VLT 2800 ............................................................... 21
Control Word Bit Descriptions VLT 6000 ................................................................. 23
Status Word Bit Descriptions VLT 6000 .................................................................. 24
Serial communication reference .............................................................................. 25
Present output frequency ....................................................................................... 26
Exception Code Tables .......................................................................................... 31
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Table of Contents
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Summary of Contents for Danfoss VLT 2800 Series
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Page 1: Table Of Contents
Serial communication reference ................25 Present output frequency ..................26 Supported Modbus RTU Function Codes ......... 27 Exception Codes ..................... 31 Exception Code Tables ..................31 Appendix A - Examples ................32 MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 2 Operating Instructions Software version: 2.6x These Operating Instructions can be used for all VLT 6000 HVAC frequency converters with software version 2.6x. The software version number can be seen from parameter 624. MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 3 å Electrostatic discharge (ESD) Electronic components are sensitive to electrostatic discharge (ESD). ESD can reduce performance or destroy sensitive electronic components. Follow proper ESD procedures during installation or servicing to prevent damage. MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 4 Using VLT 6002 - 6006, 525-600 V: Wait at least 4 minutes Using VLT 6008 - 6027, 525-600 V: Wait at least 15 minutes Using VLT 6032 - 6275, 525-600 V: Wait at least 30 minutes VLT 6000 MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 5: Overview
It is assumed that you have full knowledge of the capabilities and limitations of the controller. å Modbus RTU Overview Modbus RTU (Remote Terminal Unit) protocol defines a message structure that controllers will recognize MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 6: Vlt 2800 And Vlt 6000 With Modbus Rtu
It is also possible to access the parameters, read their values, and, where possible, write values to them. This permits a range of control possibilities, including controlling the drive’s setpoint when its internal PID controller is used. MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 7: Installation And Setup
2. The shield of the cable must be connected to the cable clamps. NOTE It is recommended to use shielded, twisted-pair cables to reduce noise between conductors. Figure 1 Network Terminal Connection MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 8: Hardware Setup Vlt 2800
If the Modbus RTU cable has to connection, must be observed. cross a motor and brake resistor cable they must cross each other at an angle of 90 degrees. MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 9: Modbus Rtu Programming
600 Baud (600 BAUD) sometimes used to allow a transmitted word to be 1200 Baud (1200 BAUD) checked for errors. Because Modbus RTU uses 2400 Baud (2400 BAUD) the more efficient CRC (Cyclic Redundancy Check) MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 10 This will delay the drive’s response to the message and possibly cause the master controller to time out. The resulting retransmissions of messages will slow communications on the network. MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 11: Vlt 6000 Parameter Settings For Modbus Communication
Since the If the number of units connected (frequency CRC check will not be valid, the drive will ignore the converters + master) exceeds 31, an amplifier MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 12 This will delay the drive’s response to the message and possibly cause the master controller to time out. The resulting retransmissions of messages will slow communications on the network. MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 13: Network Configuration
A Similarly, if a new message begins earlier that 3.5 new message can begin after this interval. character times following a previous message, the MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 14 This will cause a timeout (no CRC field is not valid for the combined messages. MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 15 å CRC Check Field Messages include an error-checking field that is based on a cyclical redundancy check (CRC) method. The MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 16: Parameter Handling
Parameter 201: Minimum Frequency, conversion factor 0.1. If parameter 201 is to be set to 10 MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 17: Register Maps Vlt 2800
04570-04999 Reserved 05000 Parameter 500, Protocol ↓ ↓ 05440 Parameter 544, Pulse Count 05450-05999 Reserved 06000 Parameter 600, Operating Data: Operating Hours ↓ ↓ 06420 Parameter 642, Power Card Identification 06430-65536 Reserved MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 18: Register Maps Vlt 6000
Parameter 600, Operating Data: Operating Hours ↓ ↓ 06310 Parameter 631, Nameplate: Communication Option Ordering No. 06320-06999 Reserved 07000 Parameter 700, Relay 6, Output Function ↓ ↓ 07110 Parameter 711, Relay 9, Off Delay 07120-65536 Reserved MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 19: Process Data
Note: In parameter 504 DC brake a No function Digital output selection is made to define how Bit 02 gates with the Terminal 46 corresponding function on a digital input. activated Select Setup, lsb Select Setup, msb Reversing MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 20 Bit 15 Reversing: Bit 15 = ’0’ causes no reversing. Bit 15 = ’1’ causes reversing. Note: In the factory setting reversing is set to digital in parameter 506 Reversing. Bit 15 only MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 21: Status Word Bit Description For Vlt 2800
Bit 02 = ’0’. The frequency converter has frequency is within the defined limits. released the motor. Bit 02 = ’1’. The frequency converter can start the motor when a start command is given. MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 22 (2000 Hex) of the reference range. Par. 202 Output frequency high limit = 50 Hz Control word = 047F Hex Start command. Reference = 2000 Hex 50% reference. Status word = 0F03 Hex. MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 23: Control Word Bit Descriptions Vlt 6000
Bit 07 = "0" leads to no reset. functions of the digital inputs. Bit 07 = "1"means that a trip is reset. Bit 02, DC BRAKE: MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 24: Status Word Bit Descriptions Vlt 6000
004. Note: In parameter 507 Choice of Setup a choice is made of the way bits 13/14 are to be gated with the corresponding function of the digital inputs. MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 25: Serial Communication Reference
Bit 10 = "0" if the output frequency has reached the value in parameter 201 Output frequency 0-16384 (4000 Hex) - 0-100 % (par. 204 Minimum low limit or parameter 202 Output frequency ref. - Par. 205 Maximum ref.). MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 26: Present Output Frequency
047F Hex. Start command Reference = E000 Hex. -50 % reference å Present output frequency The value of the present output frequency of the frequency converter at any given time is transmitted MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 27: Supported Modbus Rtu Function Codes
The Byte Count field specifies the quantity of complete bytes of data. Response The normal response is an echo of the query, returned after the coil state has been forced. MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 28 Response and second contains the low order bits. The normal response returns the slave address, function code, starting address, and quantity of coils forced. MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 29 Error Check (CRC) Register Address LO Preset Data HI Preset Data LO Error Check (CRC) Response The normal response is an echo of the query, returned after the register contents have been passed. MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 30 Field Name Example (HEX) Slave Address Function Starting Address HI Starting Address LO No. of Registers HI No of Registers LO Error Check (CRC) MG.10.S1.22 - VLT is a registered Danfoss trademark...
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Page 31: Exception Codes
There is no bus access to the parameter called Data Change is not possible because factory setup is selected Modbus RTU Errors Modbus Code Meaning (decimal) Invalid Data Address Invalid Message Length Invalid Data Length or Value Invalid Function Code MG.10.S1.22 - VLT is a registered Danfoss trademark... -
Page 32: Appendix A - Examples
Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Slave Function Coil Addr HI Coil Addr No. of Coils No. of Coils Byte Count Force Date HI Address Coils (0-7) MG.10.S1.22 - VLT is a registered Danfoss trademark... - Page 33 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 + 7 Slave Function Coil Addr HI Coil Addr LO No. of Coils HI No. of Coils LO Error Check Address [54] [13] MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 34 Error Check Address All values are in hexadecimal. å EXAMPLE 5: Read Parameter 514 Motor Current = 3 Amps (Data Type 7: UINT32) (Conversion factor = -2) Modbus Function 03 Read Holding Registers MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 35 Message sent to Modbus RTU card from Modbus master Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6+7 Slave Function Start Addr HI Start Addr LO Error Check Address Registers HI Registers LO MG.10.S1.22 - VLT is a registered Danfoss trademark...
- Page 36 Error Check Address Note that the starting address of a register is the parameter number x 10 -1 in HEX. Byte 3+byte 4: 0190 = 400 = 40% All values are in hexadecimal. MG.10.S1.22 - VLT is a registered Danfoss trademark...
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