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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

Pin Function
1, 2 Data A
3 Common
4, 5 Data 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

Parameter Parameter name Description
12-1 Modbus Address Sets the Modbus RTU network address for the soft starter.
12-2 Modbus Baud Rate Selects the baud rate for Modbus RTU communications.
12-3 Modbus Parity Selects the parity for Modbus RTU communications.
12-4 Modbus Timeout Selects 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 status Description
Off The soft starter is not powered up.
On Communication active.
Flashing Communication 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

Register Description Bits Details
40001 Command (single write) 0–7 To 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

    8–14 Reserved
    15 Must = 1
40002 Reserved    
40003 Reserved    
40004 Reserved    
40005 Reserved    
40006 Reserved    
40007 Reserved    
40008 Reserved    
40009–40xxx Parameter management (single or multiple read/ write) 0–15 Manage 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

Register Description Bits Details
30003 Reserved    
30004 Reserved    
30005 Reserved    
30006 Reserved    
30007 Reserved    
30008 Reserved    
30600 Version 0–5 Binary protocol version
    6–8 Parameter list major version
    9–15 Product type code: 15 = MCD 600
30601 Model number 0–7 Reserved
8–15 Soft starter model ID
30602 Changed parameter number 0–7 0 = No parameters have changed

 

1–255 = Index number of the last parameter changed

8–15 The total number of parameters available in the soft starter
30603 Changed parameter value 0–15 Value of the last parameter that was changed, as indicated in register 30602
Register Description Bits Details
30604 Starter state 0–4 0 = 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

    5 1 = Warning
    6 0 = Uninitialized

 

1 = Initialized

    7 Command source

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

    8 0 = Parameters have changed since the last parameter read

 

1 = No parameters have changed

    9 0 = Negative phase sequence

 

1 = Positive phase sequence

    10–15 Reserved
30605 Current 0–13 Average rms current across all 3 phases
14–15 Reserved
30606 Current 0–9 Current (% motor FLC)
10–15 Reserved
30607 Motor temperature 0–7 Motor thermal model (%)
8–15 Reserved
Register Description Bits Details
30608 Power 0–11 Power
    12–13 Power 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

    14–15 Reserved
30609 % Power factor 0–7 100% = power factor of 1
    8–15 Reserved
30610 Voltage 0–13 Average rms voltage across all 3 phases
    14–15 Reserved
30611 Current 0–13 Phase 1 current (rms)
    14–15 Reserved
30612 Current 0–13 Phase 2 current (rms)
    14–15 Reserved
30613 Current 0–13 Phase 3 current (rms)
    14–15 Reserved
30614 Voltage 0–13 Phase 1 voltage
    14–15 Reserved
30615 Voltage 0–13 Phase 2 voltage
    14–15 Reserved
30616 Voltage 0–13 Phase 3 voltage
    14–15 Reserved
30617 Parameter list version number 0–7 Parameter list minor revision
    8–15 Parameter list major version
30618 Digital input state 0–15 For all inputs, 0 = open, 1 = closed (shorted) 0 = Start/Stop

1 = Reserved

 

2 = Reset

 

3 = Input A 4 = Input B

5 to 15 = Reserved

Register Description Bits Details
30619 Trip code 0–15 See 4.8 Trip Codes
    8–15 Reserved
30620–30631 Reserved    

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

Register Description Bits Details
40001 Reserved    
40002 Command (single write) 0–2 To 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

3–15 Reserved
Register Description Bits Details
40003 Soft starter state 0–3 1 = 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

4 1 = Positive phase sequence (only valid if bit 6 = 1)
5 1 = Current exceeds FLC
6 0 = Uninitialized

 

1 = Initialized

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

 

15 = MCD 600

40601 Model number 0–7 Reserved
    8–15 Soft starter model ID
Register Description Bits Details
40602 Changed parameter number 0–7 0 = No parameters have changed

 

1–255 = Index number of the last parameter changed

    8–15 The total number of parameters available in the soft starter
40603 Changed parameter value 0–15 Value of the last parameter that was changed, as indicated in register 40602
40604 Starter state 0–4 0 = 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

5 1 = Warning
6 0 = Uninitialized

 

1 = Initialized

7 Command source

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

8 0 = Parameters have changed since the last parameter read

 

1 = No parameters have changed

9 0 = Negative phase sequence

 

1 = Positive phase sequence

10–15 Reserved
40605 Current 0–13 Average rms current across all 3 phases
    14–15 Reserved
40606 Current 0–9 Current (% motor FLC)
    10–15 Reserved
Register Description Bits Details
40607 Motor temperature 0–7 Motor thermal model (%)
    8–15 Reserved
40608 Power 0–11 Power
    12–13 Power 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

    14–15 Reserved
40609 % Power factor 0–7 100% = power factor of 1
8–15 Reserved
40610 Voltage 0–13 Average RMS voltage across all 3 phases
14–15 Reserved
40611 Current 0–13 Phase 1 current (rms)
14–15 Reserved
40612 Current 0–13 Phase 2 current (rms)
14–15 Reserved
40613 Current 0–13 Phase 3 current (rms)
14–15 Reserved
40614 Voltage 0–13 Phase 1 voltage
14–15 Reserved
40615 Voltage 0–13 Phase 2 voltage
14–15 Reserved
40616 Voltage 0–13 Phase 3 voltage
14–15 Reserved
40617 Parameter list version number 0–7 Parameter list minor revision
8–15 Parameter list major version
Register Description Bits Details
40618 Digital input state 0–15 For all inputs, 0 = open, 1 = closed (shorted) 0 = Start/Stop

1 = Reserved

 

2 = Reset

 

3 = Input A 4 = Input B

5–15 = Reserved

40619 Trip code 0–7 See 4.8 Trip Codes
    8–15 Reserved
40620–40631 Reserved    

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

Message Soft starter address Function code Register address Data CRC
In 20 06 40002 1 CRC1, CRC2
Out 20 06 40002 1 CRC1, CRC2

Table 6: Soft Starter State: Running

Message Soft starter address Function code Register address Data CRC
In 20 03 40003 1 CRC1, CRC2
Out 20 03 2 xxxx0011 CRC1, CRC2

Table 7: Trip Code: Motor Overload

Message Soft starter address Function code Register address Data CRC
In 20 03 40004 1 CRC1, CRC2
Out 20 03 2 00000010 CRC1, CRC2

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

Message Soft starter address Function code Register Data CRC
In 20 03 40013 1 CRC1, CRC2
Out 20 03 2 (bytes) 600 CRC1, CRC2

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

Message Soft starter address Function code Register Data CRC
In 20 06 40024 1 CRC1, CRC2
Out 20 06 40024 1 CRC1, 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

Message Soft starter address Function code Register Data CRC
In 20 16 40017, 3 15, 300, 350 CRC1, CRC2
Out 20 16 40017, 3 15, 300, 350 CRC1, 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

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

Modbus Error Codes

Code Description Example
1 Illegal function code The adapter or soft starter does not support the requested function.
2 Illegal data address The adapter or soft starter does not support the specified register address.
3 Illegal data value The adapter or soft starter does not support 1 of the received data values.
4 Slave device error An error occurred while trying to perform the requested function.
6 Slave device busy The 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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