Danfoss VLT MCD 200 User manual

MCD Modbus Module Instructions Introduction
MG.17.F5.02 - VLT®is a registered Danfoss trademark 1
INSTALLATION INSTRUCTIONS: MCD MODBUS MODULE
Order Code: 175G9000
1. Introduction
Danfoss soft starters can be controlled and monitored across an RS485 serial communication
network using the Modbus RTU and AP ASCII protocols.
For users requiring simple control of MCD 200 and MCD 500 soft starters using Modbus RTU or AP
ASCII, the instructions below describe the installation and operation of the Modbus Module.
MCD 3000 soft starters have AP ASCII protocol support built in - see the MCD 3000 Users Manual for
details of message formats. The MCD 3000 supports Modbus RTU control when used in conjunction
with a Remote Operator.
This document describes Modbus and AP ASCII messaging and
Appendix A describes how to connect
the Remote Operator and use it as a Modbus RTU or AP ASCII slave device.
2. Installation
1. Remove control power and mains supply from the soft starter.
2. Attach the Modbus Module to the starter as shown.
3. Apply control power to the soft starter.
MCD 200 MCD 500
177HA261.11
177HA528.10
Remove the Modbus Module using the following procedure:
1. Disconnect the RS485 cable from the module.
2. Remove control power and mains supply from the soft starter.
3. Push a small flat-bladed screwdriver into the slots at the top and
bottom of the module and depress the retaining clips.
4. Pull the module away from the soft starter.
177HA378.10
CAUTION
Remove mains and control voltage from the soft starter before attaching or removing
accessories. Failure to do so may damage the equipment.

Adjustment MCD Modbus Module Instructions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 2
3. Adjustment
Network communication parameters must be set on the Modbus Module. DIP switch settings take
effect on the power-up of the Modbus Module via the soft starter.
123456
ON
123456
ON
Protocol
Address
Baud Rate
Parity
imeout
(seconds)
4800
OFF
OFF
9600
OFF
ON
19200
ON
38400
ON
ONOFF
No Parity
OFF
OFF
ODD
OFF
ON
EVEN
ON
10 bit
ON
ONOFF
No ime Out
OFF
OFF
10 s
OFF
ON
60 s
ON
100 s
ON
ONOFF
AP
ASCII
OFF
R U
ON
Example: Address = 24
+16
+8
+4
+2
+1
0
0
0
0
0
ON
+16
+8
+4
+2
+1
0
0
0
0
0
ON
DIP SWI CH A DIP SWI CH B
177HA262.11
4. Connection
For the Modbus Module to accept serial commands, a link must be fitted across terminals A1-N2 on
MCD 200 Series starters.
In order for the MCD 500 to accept commands from the serial network, the soft starter must be in
Auto On mode and links must be fitted to terminals 17 and 25 to 18.
In Hand On mode, the starter will not accept commands from the serial network but the starter's
status can still be monitored.
MCD 200 MCD 500
177HA326.12
MCD 200
RS485
SERIAL PORT
B8 B7 B6
GND -
+
MODBUS
MODULE
A1
N2
RS485
Modbus network
connection
MCD 500
(Auto On mode)
RS485 serial port
B8 B7 B6
+ GND -
MODBUS
MODULE
RS485
Modbus network
connection
25
17
18
Stop
COM
Reset
177HA532.10
N.B.!:
If MCD 500 parameter 3-2 Comms in Remote is set to Disable Comms in Remote, the
starter will not accept start or stop commands from the serial network (the starter will
still accept reset commands and allow status monitoring).

MCD Modbus Module Instructions Network Status LED
MG.17.F5.02 - VLT®is a registered Danfoss trademark 3
5. Network Status LED
The Network Status LED indicates the state of the
communications link between the module and the network.
LED operation is as follows:
LED
177HA263.11
Off On Flashing
No connection or soft starter not
powered up Communication active Communication inactive
N.B.!:
If communication is inactive, the soft starter may trip if the Communications Timeout
function has been set on the module. When communication is restored, the soft starter
will require a Reset.

Modbus Register MCD Modbus Module Instructions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 4
6. Modbus Register
Register
Address
Type Description
MCD 201 MCD 202 MCD 500 MCD 3000
40002 Single Write 1 = Start
Command 2 = Stop
3 = Reset
4 = Quick stop (coast to stop)
5 = Forced communication trip
40003 Multiple Read Bit Description
Starter
status
0 to 3 1 = Ready
2 = Starting
3 = Running
4 = Stopping (including braking)
5 = Restart delay (including
Temperature check)
6 = Tripped
7 = Program mode
8 = Jog forward
9 = Jog reverse
4 1 = Positive phase sequence (only valid if bit
6 = 1). Always = 0
5 1 = Current exceeds FLC
6 0 = Uninitialised
1 = Initialised
7 Always = 0
40004
Trip Code Multiple Read See Trip Code table.
40005 1
Motor
current
Multiple Read Average 3 phase motor current (A)
40006
Motor
temperature
Multiple Read Motor temperature (thermal model)
40007 Multiple Read Bit Description
Product Type 0 to 2 Product parameter list version
and Version 3 to 7
1= MCD 3000
4= MCD 200
7 = MCD 500
40008
Serial
Protocol
Version
Multiple Read
40009 2 ~ Single Write Parameter 1-A (Motor FLC) to:
Parameter and Multiple •MCD 500 Par. 20-6 (Pedestal Detect)
management Read •MCD 3000 Par. 60 (Min Run Frequency)

MCD Modbus Module Instructions Modbus Register
MG.17.F5.02 - VLT®is a registered Danfoss trademark 5
1For MCD 500 models MCD5-0068B and smaller this value will be 10 times greater than the value
displayed on the LCP.
2See the relevant soft starter literature for a complete parameter list. The first product parameter
is always allocated to register 40009. The last product parameter is allocated to register 40XXX,
where XXX = 008 plus total number of available parameters in the product.
N.B.!:
The numbering of parameter options via serial communications differs slightly from the
numbering displayed on the LCP. Numbering via the Modbus Module starts at 0, so for
Par. 2-1 Phase Sequence, the options are 1~3 on the LCP but 0~2 via the module.

Trip Codes MCD Modbus Module Instructions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 6
7. Trip Codes
Trip
Code
Trip Name
MCD 201 MCD 202 MCD 500
MCD 3000
1 Excess start time
2 Motor overload (thermal model)
3 Motor thermistor
4 Current imbalance
5 Frequency (Mains supply)
6 Phase sequence
7 Instantaneous overcurrent
8 Power loss (Power circuit)
9 Undercurrent
10 Heatsink overtemperature
11 Motor connection
12 Input A trip (Auxiliary input A)
13 FLC too high (FLC out of range)
14 Unsupported option (Not available in 6-wire)
15 Starter communication
16 Network communication
17 Internal fault
23 EEPROM fail
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)
35 Battery/clock
36 Thermistor circuit
255 No trip

MCD Modbus Module Instructions Modbus Functions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 7
8. Modbus Functions
The Modbus Module supports the following Modbus functions:
03 Read multiple registers
06 Write single register
Modbus broadcast functions are not supported.
MCD 200 soft starters (including Remote Operator):
Read multiple registers 40003 to 40008
Write single register 40002
MCD 500 soft starters:
Read multiple registers starting from 40003 up to a maximum of 125 register blocks
Write single register 40002 or 40009 to 40599
N.B.!:
A multiple read across register boundary 40008/40009 will result in a Modbus Error code
05 at the Master.
Modbus Module version 3 and earlier (serial number xxxxxx-3) can read a maximum of
119 register blocks.
8.1. Master Configuration
For standard Modbus 11-bit transmission, the Master must be configured for 2 stop bits with No
Parity and 1 stop bit for odd or even parity.
For 10-bit transmission, the Master must be configured for 1 stop bit.
In all cases, the Master baud rate and slave address must match those set on the Modbus Module DIP
switches.
Command: Start
Message Starter
Address
Function Code Register
Address
Data CRC
In 20 06 40002 1 CRC1, CRC2
Out 20 06 40002 1 CRC1, CRC2
Starter status: Running
Message Starter
Address
Function Code Register
Address
Data CRC
In 20 03 40003 1 CRC1, CRC2
Out 20 03 2 (bytes) 3 CRC1, CRC2
Trip code: Motor overload
Message Starter
Address
Function Code Register
Address
Data CRC
In 20 03 40004 1 CRC1, CRC2
Out 20 03 2 (bytes) 2 CRC1, CRC2
Download parameter from starter
MCD 500: Read Parameter 1, Motor FLC (Parameter 1-1), 100 A
Message Starter
Address
Function
Code
Register
Address
Data CRC
In 20 03 40009 1 CRC1, CRC2
Out 20 03 2 (bytes) 100 CRC1, CRC2

Modbus Error Codes MCD Modbus Module Instructions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 8
Upload parameter to starter
MCD 500: Write Parameter 4, Current Limit (Parameter 1-4), set = 400% FLC
Message Starter
Address
Function
Code
Register
Address
Data CRC
In 20 06 40012 400 CRC1, CRC2
Out 20 06 40012 400 CRC1, CRC2
9. Modbus Error Codes
Code Description Example
01 Illegal function code Function other than 03 or 06
02 Illegal data address Register number invalid
03 Not readable data Register not allowed for data reading
04 Not writable data Register not allowed for data writing
05 Data boundary fault Multiple data transfer across data boundary or data size more than
125
06 Invalid command code e.g. writing "6" into 40003
07 Illegal parameter read Invalid parameter number
08 Illegal parameter write Invalid parameter number, read only, or hidden parameter
09 Unsupported command
Sending a serial command to MCD 500 with parameter 3-2 =
Disable control in RMT.
10 Local communication error Communication error between Modbus slave and starter
N.B.!:
Some of the above codes are different from those defined in the Modbus Application
Protocol Specification available on www.modbus.org.

MCD Modbus Module Instructions AP ASCII Protocol
MG.17.F5.02 - VLT®is a registered Danfoss trademark 9
10. AP ASCII Protocol
The message fragments used to communicate with the Modbus Module as an AP ASCII slave device
are shown below. The message fragments may be assembled into complete messages as described
in the sections that follow.
N.B.!:
Data must be transmitted in 8-bit ASCII, no parity, one stop bit.
Message Fragment Type ASCII Character String or
(Hexadecimal Character String)
Send address EOT
(04h [nn] [nn] [lrc] [lrc] ENQ or 05h)
Send command STX [ccc] [lrc] ETX or
Send request (02h [ccc] [lrc] 03h)
Receive data STX
(02h [dddd]
[dddd] [lrc]
[lrc] ETX or 03h)
Receive status STX
(02h [ssss]
[ssss] [lrc]
[lrc] ETX or 03h)
ACK (acknowledge) ACK
(06h) or
NAK (negative
acknowledge) NAK
(15h) or
ERR (error) BEL
(07h) or
nn = two byte ASCII number representing the soft starter address where each decimal digit is
represented by n.
lrc = two byte longitudinal redundancy check in hexadecimal.
ccc = three byte ASCII command number where each character is represented by c.
dddd = four byte ASCII number representing the current or temperature data where each decimal digit is
represented by d.
ssss = four byte ASCII number. The first two bytes are ASCII zero. The last two bytes represent the nibbles
of a single byte of status data in hexadecimal.
10.1. Commands
Commands can be sent to the soft starter using the following format:
Send
address
ACK Send
command
ACK
Possible error responses:
NAK (Invalid LRC)
= Master
=Slave (softstarter)
Command ASCII Comment
Start B10 Initiates a start
Stop B12 Initiates a stop
Reset B14 Resets a trip state
Quick stop B16 Initiates an immediate removal of voltage from the motor. Any soft
stop settings are ignored.
Forced communication trip B18 Causes a communications trip

AP ASCII Protocol MCD Modbus Module Instructions
MG.17.F5.02 - VLT®is a registered Danfoss trademark 10
10.2. Status Retrieval
Soft starter status can be retrieved using the following format:
ACK
NAK
177HA316.12
Send
Address Send Request Receive Status
Invalid LRCPossible error responses
= Master = Slave (MCD)
Request ASCII Receive Status (ssss)
Trip code C18 See the trip code table.
Starter status C22 Bit Description
0 to 3 1 = Ready
2 = Starting
3 = Running
4 = Stopping (including braking)
5 = Restart delay (including Temperature check)
6 = Tripped
7 = Program mode
4 1 = Positive phase rotation (only valid if bit 6 = 1)
5 1 = Current exceeds FLC
6 0 = Uninitialised
1 = Initialised
7 0 = Communications are OK
1 = Communications device fault
10.3. Data Retrieval
Data can be retrieved from the soft starter using the following format:
ACK
NAK
177HA313.10
Send
Address Send Request Receive Data
Invalid LRCPossible error responses
= Master = Slave (MCD)
Request ASCII Receive Data (dddd)
Motor current D10 Requests motor current. The data is four byte decimal ASCII. Minimum value
0000 A, maximum value 9999 A.
Motor
temperature D12 Requests the calculated value of the motor thermal model as a % of motor thermal capacity. The data is four byte decimal ASCII. Minimum value is
0000%. Trip point is 0105%.