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Danfoss MCD 600 Modbus RTU Card

Danfoss-MCD-600-Modbus-RTU-Card-product

Specifications

  • Connections: Expansion port
  • Settings: Modbus Network Settings
  • Certification: Internationally recognized standard practice for RS-485 communication

Product Usage Instructions

Installation

Installing the Expansion Card

Procedure:

  1. Push a small flat-bladed screwdriver into the slot in the center of the expansion port cover and ease the cover away from the soft starter.
  2. Line up the card with the expansion port.
  3. Gently push the card along the guide rails until it clicks into the soft starter.

Connecting to the Network

Prerequisites:
The expansion card must be installed in the soft starter.

Procedure:

  1. Restore control power.
  2. Connect field wiring via the 5-way connector plug.

Operation

Prerequisites
Ensure the expansion card is correctly installed and connected to the network.

Master Configuration
Configure the soft starter as the master device for Modbus communication.

Configuration

  • Modbus Network Settings:
    Adjust network settings as required.
  • Enabling Network Control:
    Enable network control for remote operation.
  • Feedback LEDs
    Observe feedback LEDs to monitor system status.
  • Modbus Registers
    Refer to the user manual for detailed information on Modbus registers, PLC configuration, compatibility, parameter management, standard mode, legacy mode, examples, trip codes, and Modbus error codes.

Safety

Disclaimer
The examples and diagrams in this manual are included solely for illustrative purposes. The information contained in this manual is subject to change at any time and without prior notice. Responsibility or liability is never accepted for direct, indirect, or consequential damage resulting from the use or application of this equipment.

Warnings

SHOCK HAZARD
Attaching or removing accessories while the soft starter is connected to mains voltage may cause personal injury. – Before attaching or removing accessories, isolate the soft starter from mains voltage.

RISK OF PERSONAL INJURY AND EQUIPMENT DAMAGE
Inserting foreign objects or touching the inside of the soft starter while the expansion port cover is open may endanger personnel and can damage the soft starter.

  • Do not insert foreign objects in the soft starter with the port cover open.
  • Do not touch the inside of the soft starter with the port cover open.

Important User Information

  • Observe all necessary safety precautions when controlling the soft starter remotely. Alert personnel that machinery may start without warning.
  • The installer is responsible for following all instructions in this manual and for following correct electrical practice.
  • Use all internationally recognized standard practices for RS-485 communication when installing and using this equipment.

Installation

Installing the Expansion Card

Procedure

  1. Push a small flat-bladed screwdriver into the slot in the center of the expansion port cover and ease the cover away from the soft starter.
  2. Line up the card with the expansion port.
  3. Gently push the card along the guide rails until it clicks into the soft starter.

Example:

Danfoss-MCD-600-Modbus-RTU-Card-fig- (1)

Illustration 1: Installation of the Expansion Cards

Connecting to the Network

Prerequisites:
The expansion card must be installed in the soft starter.

Procedure

  1. Restore control power.
  2. Connect field wiring via the 5-way connector plug.

Example:

Danfoss-MCD-600-Modbus-RTU-Card-fig- (2)

Illustration 2: 5-way Connector Plug

PinFunction
1, 2Data A
3Common
4, 5Data B

Operation

Prerequisites
The Modbus RTU Card must be controlled by a Modbus client (such as a PLC) that complies with the Modbus Protocol Specification. For successful operation, the client must also support all functions and interfaces described in this manual.

Master Configuration

  • For standard Modbus 11-bit transmission, configure the master for 2 stop bits with no parity and 1 stop bit for odd or even parity. For 10-bit transmission, configure the master for 1 stop bit.
  • In all cases, the master baud rate and slave address must match those set in parameters 12-1 to 12-4.
  • The data polling interval must be long enough for the module to respond. Short polling intervals may cause inconsistent or incorrect behavior, particularly when reading multiple registers. The recommended minimum polling interval is 300 ms.

Configuration

Modbus Network Settings
Set the network communication parameters for the card via the soft starter. For details on how to configure the soft starter, see the VLT® Soft Starter MCD 600 Operating Guide.

Table 1: Parameter Settings

ParameterParameter nameDescription
12-1Modbus AddressSets the Modbus RTU network address for the soft starter.
12-2Modbus Baud RateSelects the baud rate for Modbus RTU communications.
12-3Modbus ParitySelects the parity for Modbus RTU communications.
12-4Modbus TimeoutSelects the timeout for Modbus RTU communications.

NOTICE 
The Modbus RTU Card reads communications parameter settings from the soft starter when control power is applied. If parameters are changed in the soft starter, the cycle control power is required for the new values to take effect.

Enabling Network Control
The soft starter only accepts commands from the expansion card if parameter 1-1 Command Source is set to Network.

NOTICE
If the reset input is active, the soft starter does not operate. If a reset switch is not required, fit a link across terminals RESET, COM+ on the soft starter.

LED statusDescription
OffThe soft starter is not powered up.
OnCommunication active.
FlashingCommunication inactive.

NOTICE
If communication is inactive, the soft starter may trip on Network Communications. If parameter 6-13 Network Communications is set to Soft Trip and Log or Trip Starter, the soft starter requires a reset.

Modbus Registers

NOTICE  
All references to registers mean the registers within the device unless otherwise stated.

Compatibility
The Modbus RTU Card supports 2 modes of operation:

  • In Standard Mode, the device uses registers defined in the Modbus Protocol Specification.
  • In Legacy Mode, the device uses the same registers as the clip-on Modbus Module supplied by Danfoss for use with older soft starters. Some registers differ from those specified in the Modbus Protocol Specification.

Ensuring Safe and Successful Control

  • Data written to the device remains in its registers until the data is overwritten or the device is reinitialized.
  • If the soft starter should be controlled via parameter 7-1 Command Override or should be disabled via the reset input (terminals RESET, COM+), fieldbus commands should be cleared from the registers. If a command is not cleared, it is resent to the soft starter once fieldbus control resumes.

Parameter Management
Parameters can be read from and written to the soft starter. The Modbus RTU can read or write a maximum of 125 registers in 1 operation.

NOTICE  

  • The total number of parameters in the soft starter may vary according to the model and parameter list of the soft starter. Attempting to write to a register not associated with a parameter returns an error code 02 (illegal data address). Read register 30602 to determine the total number of parameters in the soft starter.
  • Do not change the default values of the Advanced parameters (parameter group 20-** Advanced Parameters). Changing these values may cause unpredictable behavior in the soft starter.

Standard Mode

Command and Configuration Registers (Read/Write)

Table 2: Description of Read/Write Registers

RegisterDescriptionBitsDetails
40001Command (single write)0–7To send a command to the starter, write the required value: 00000000 = Stop

00000001 = Start

 

00000010 = Reset

 

00000100 = Quick stop (coast to stop) 00001000 = Forced communication trip 00010000 = Start using Parameter Set 1 00100000 = Start using Parameter Set 2 01000000 = Reserved

10000000 = Reserved

  8–14Reserved
  15Must = 1
40002Reserved  
40003Reserved  
40004Reserved  
40005Reserved  
40006Reserved  
40007Reserved  
40008Reserved  
40009–40xxxParameter management (single or multiple read/ write)0–15Manage soft starter programmable parameters. See the VLT® Soft Starter MCD 600 Operating Guide for a complete parameter list.

Status Reporting Registers (Read Only)

NOTICE  
For models MCD6-0063B and smaller (soft starter model ID 1~4), the current reported via communications registers is 10 times greater than the actual value.

Table 3: Description of Read Registers

RegisterDescriptionBitsDetails
30003Reserved  
30004Reserved  
30005Reserved  
30006Reserved  
30007Reserved  
30008Reserved  
30600Version0–5Binary protocol version
  6–8Parameter list major version
  9–15Product type code: 15 = MCD 600
30601Model number0–7Reserved
8–15Soft starter model ID
30602Changed parameter number0–70 = No parameters have changed

 

1–255 = Index number of the last parameter changed

8–15The total number of parameters available in the soft starter
30603Changed parameter value0–15Value of the last parameter that was changed, as indicated in register 30602
RegisterDescriptionBitsDetails
30604Starter state0–40 = Reserved

 

1 = Ready

 

2 = Starting

 

3 = Running

 

4 = Stopping

 

5 = Not ready (restart delay, restart temperature check, run simulation, reset input is open)

 

6 = Tripped

 

7 = Programming mode 8 = Jog forward

9 = Jog reverse

  51 = Warning
  60 = Uninitialized

 

1 = Initialized

  7Command source

0 = Remote Keypad, Digital Input, Clock 1 = Network

  80 = Parameters have changed since the last parameter read

 

1 = No parameters have changed

  90 = Negative phase sequence

 

1 = Positive phase sequence

  10–15Reserved
30605Current0–13Average rms current across all 3 phases
14–15Reserved
30606Current0–9Current (% motor FLC)
10–15Reserved
30607Motor temperature0–7Motor thermal model (%)
8–15Reserved
RegisterDescriptionBitsDetails
30608Power0–11Power
  12–13Power scale

 

0 = Multiply power by 10 to get W 1 = Multiply power by 100 to get W 2 = Power (kW)

3 = Multiply power by 10 to get kW

  14–15Reserved
30609% Power factor0–7100% = power factor of 1
  8–15Reserved
30610Voltage0–13Average rms voltage across all 3 phases
  14–15Reserved
30611Current0–13Phase 1 current (rms)
  14–15Reserved
30612Current0–13Phase 2 current (rms)
  14–15Reserved
30613Current0–13Phase 3 current (rms)
  14–15Reserved
30614Voltage0–13Phase 1 voltage
  14–15Reserved
30615Voltage0–13Phase 2 voltage
  14–15Reserved
30616Voltage0–13Phase 3 voltage
  14–15Reserved
30617Parameter list version number0–7Parameter list minor revision
  8–15Parameter list major version
30618Digital input state0–15For all inputs, 0 = open, 1 = closed (shorted) 0 = Start/Stop

1 = Reserved

 

2 = Reset

 

3 = Input A 4 = Input B

5 to 15 = Reserved

RegisterDescriptionBitsDetails
30619Trip code0–15See 4.8 Trip Codes
  8–15Reserved
30620–30631Reserved  

NOTICE
Reading register 30603 (Changed parameter value) resets registers 30602 (Changed parameter number) and 30604 (Parameters have changed). Always read registers 30602 and 30604 before reading register 30603.

Legacy Mode

Registers

NOTICE 

  • For models MCD6-0063B and smaller (soft starter model ID 1~4), the current reported via communications registers is 10 times greater than the actual value.
  • Legacy Mode reports read-only status information in registers 40003 onwards to match the register definitions of the clip-on Modbus Module. Identical data is also available via registers 30003 onwards.

Table 4: Description of Registers in Legacy Mode

RegisterDescriptionBitsDetails
40001Reserved  
40002Command (single write)0–2To send a command to the starter, write the required value: 1 = Start

2 = Stop

 

3 = Reset

 

4 = Quick stop (coast to stop)

5 = Forced communication trip 6 = Start using Parameter Set 1 7 = Start using Parameter Set 2

3–15Reserved
RegisterDescriptionBitsDetails
40003Soft starter state0–31 = Ready

 

2 = Starting

 

3 = Running

 

4 = Stopping (including braking)

 

5 = Restart delay (including temperature check) 6 = Tripped

7 = Programming mode 8 = Jog forward

9 = Jog reverse

41 = Positive phase sequence (only valid if bit 6 = 1)
51 = Current exceeds FLC
60 = Uninitialized

 

1 = Initialized

7–15Reserved
40004Reserved  
40005Motor current0–7Average 3-phase motor current (A)
8–15Reserved
40006Motor temperature0–7Motor thermal model (%)
8–15Reserved
40007Reserved  
40008Reserved  
40009–40xxxParameter management (single or multiple read/ write)0–7Manage soft starter programmable parameters. See the VLT® Soft Start- er MCD 600 Operating Guide for a complete parameter list.
8–15Reserved
40600Version0–5Binary protocol version
6–8Parameter list version number
9–15Product type code:

 

15 = MCD 600

40601Model number0–7Reserved
  8–15Soft starter model ID
RegisterDescriptionBitsDetails
40602Changed parameter number0–70 = No parameters have changed

 

1–255 = Index number of the last parameter changed

  8–15The total number of parameters available in the soft starter
40603Changed parameter value0–15Value of the last parameter that was changed, as indicated in register 40602
40604Starter state0–40 = Reserved

 

1 = Ready

 

2 = Starting

 

3 = Running

 

4 = Stopping

 

5 = Not ready (restart delay, restart temperature check, run simulation, reset input is open)

 

6 = Tripped

 

7 = Programming mode 8 = Jog forward

9 = Jog reverse

51 = Warning
60 = Uninitialized

 

1 = Initialized

7Command source

0 = Remote Keypad, Digital Input, Clock 1 = Network

80 = Parameters have changed since the last parameter read

 

1 = No parameters have changed

90 = Negative phase sequence

 

1 = Positive phase sequence

10–15Reserved
40605Current0–13Average rms current across all 3 phases
  14–15Reserved
40606Current0–9Current (% motor FLC)
  10–15Reserved
RegisterDescriptionBitsDetails
40607Motor temperature0–7Motor thermal model (%)
  8–15Reserved
40608Power0–11Power
  12–13Power scale

 

0 = Multiply power by 10 to get W 1 = Multiply power by 100 to get W 2 = Power (kW)

3 = Multiply power by 10 to get kW

  14–15Reserved
40609% Power factor0–7100% = power factor of 1
8–15Reserved
40610Voltage0–13Average RMS voltage across all 3 phases
14–15Reserved
40611Current0–13Phase 1 current (rms)
14–15Reserved
40612Current0–13Phase 2 current (rms)
14–15Reserved
40613Current0–13Phase 3 current (rms)
14–15Reserved
40614Voltage0–13Phase 1 voltage
14–15Reserved
40615Voltage0–13Phase 2 voltage
14–15Reserved
40616Voltage0–13Phase 3 voltage
14–15Reserved
40617Parameter list version number0–7Parameter list minor revision
8–15Parameter list major version
RegisterDescriptionBitsDetails
40618Digital input state0–15For all inputs, 0 = open, 1 = closed (shorted) 0 = Start/Stop

1 = Reserved

 

2 = Reset

 

3 = Input A 4 = Input B

5–15 = Reserved

40619Trip code0–7See 4.8 Trip Codes
  8–15Reserved
40620–40631Reserved  

NOTICE
Reading register 40603 (Changed parameter value) resets registers 40602 (Changed parameter number) and 40604 (Parameters have changed). Always read registers 40602 and 40604 before reading register 40603.

Examples

Table 5: Command: Start

MessageSoft starter addressFunction codeRegister addressDataCRC
In2006400021CRC1, CRC2
Out2006400021CRC1, CRC2

Table 6: Soft Starter State: Running

MessageSoft starter addressFunction codeRegister addressDataCRC
In2003400031CRC1, CRC2
Out20032xxxx0011CRC1, CRC2

Table 7: Trip Code: Motor Overload

MessageSoft starter addressFunction codeRegister addressDataCRC
In2003400041CRC1, CRC2
Out2003200000010CRC1, CRC2

Table 8: Download Parameter from Soft Starter – Read Parameter 5 (Parameter 1-5 Locked Rotor Current), 600%

MessageSoft starter addressFunction codeRegisterDataCRC
In2003400131CRC1, CRC2
Out20032 (bytes)600CRC1, CRC2

Table 9: Upload Single Parameter to Soft Starter – Write Parameter 61 (Parameter 2-9 Stop Mode), set =1

MessageSoft starter addressFunction codeRegisterDataCRC
In2006400241CRC1, CRC2
Out2006400241CRC1, CRC2

Table 10: Upload Multiple Parameters to Soft Starter – Write Parameters 9, 10, 11 (Parameters 2-2 to 2-4) Set to Values of 15 s, 300%, and 350%, Respectively

MessageSoft starter addressFunction codeRegisterDataCRC
In201640017, 315, 300, 350CRC1, CRC2
Out201640017, 315, 300, 350CRC1, CRC2

NOTICE  
This function can only be used to upload consecutive parameters. The Register field indicates the number of parameters to be uploaded and the register number of the 1st parameter.

Trip Codes

CodeDescription
0No trip
1Excess start time
2Motor overload
3Motor thermistor
4Current imbalance
5Frequency
6Phase sequence
7Instantaneous overcurrent
8Power loss
9Undercurrent
10Heatsink overtemperature
11Motor connection
12Input A trip
13FLC too high
14Unsupported option (function not available inside the delta)
15Communications card fault
16Forced network trip
17Internal fault
18Overvoltage
19Undervoltage
23Parameter out of range
24Input B trip
26L1 phase loss
27L2 phase loss
28L3 phase loss
29L1-T1 shorted
30L2-T2 shorted
31L3-T3 shorted
33Time-overcurrent (bypass overload)
CodeDescription
34SCR overtemperature
35Battery/clock
36Thermistor circuit
47Overpower
48Underpower
56LCP disconnected
57Zero speed detect
58SCR itsm
59Instantaneous overcurrent
60Rating capacity
70Current read err L1
71Current read err L2
72Current read err L3
73Remove mains volts (mains voltage connected in run simulation)
74Motor connection T1
75Motor connection T2
76Motor connection T3
77Firing fail P1
78Firing fail P2
79Firing fail P3
80VZC fails P1
81VZC fails P2
82VZC fails P3
83Low control volts
84–96Internal fault x. Contact the local supplier with the fault code (x).

Modbus Error Codes

CodeDescriptionExample
1Illegal function codeThe adapter or soft starter does not support the requested function.
2Illegal data addressThe adapter or soft starter does not support the specified register address.
3Illegal data valueThe adapter or soft starter does not support 1 of the received data values.
4Slave device errorAn error occurred while trying to perform the requested function.
6Slave device busyThe adapter is busy (for example, writing parameters to the soft starter).

Specifications

  • Soft starter 6-way pin assembly
  • Network 5-way male and unpluggable female connector (supplied)
  • Maximum cable size 2.5 mm2 (14 AWG)

Settings

  • Protocol Modbus RTU, AP ASCII
  • Address range 0–254
  • Data rate (bps) 4800, 9600, 19200, 38400
  • Parity None, Odd, Even, 10-bit
  • Timeout None (Off), 10 s, 60 s, 100 s

Certification

  • RCM IEC 60947-4-2
  • CE EN 60947-4-2
  • RoHS Compliant with EU Directive 2011/65/EU

Danfoss can accept no responsibility for possible errors in catalogues, brochures, and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order, provided that such alterations can be made without subsequent changes being necessary in specifications already agreed upon. All trademarks in this material are the property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Frequently Asked Questions

  • Q: Can I insert foreign objects into the soft starter with the port cover open?
    A: No, do not insert foreign objects in the soft starter with the port cover open, as it may endanger personnel and damage the equipment.
  • Q: What safety precautions should be observed when controlling the soft starter remotely?
    A: Observe all necessary safety precautions and alert personnel that machinery may start without warning. Follow correct electrical practices and use internationally recognized standard practice for RS-485 communication.

Documents / Resources

Danfoss MCD 600 Modbus RTU Card [pdf] Installation Guide
AQ277154312778, MCD 600 Modbus RTU Card, Modbus RTU Card, RTU Card

References

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