Danfoss demonstrates the hidden power in the Danfoss FC51 series of inverters when it is trusted by consumers thanks to its powerful features, high durability, saving installation costs and compact size. This will certainly be the inverter line suitable for common applications such as pumps, fans, conveyors, cooling towers, … or widely used in the fields of HVAC, OEM.
In addition to the basic control methods of the inverter, Danfoss FC51 also supports Modbus-RTU communication protocol, today plc247.com will support you to control it with Mitsubishi Q-Series PLC (using QJ71C24N Module).
QJ71C24N & Danfoss FC51 “Wiring Diagram”
Danfoss FC51 inverter has a built-in RS485 communication port that makes it easy to connect from the QJ71C24N Module to it as shown in the diagram below:
Danfoss FC51 “Modbus RTU” Parameters Setting
In addition to the basic parameters of the inverter installed according to the motor (frequency, current, voltage…) to be able to control Danfoss FC51 using Modbus RTU protocol, we need to install the transmission parameters as follow:
Danfoss FC51 Modbus Registers Address
>>> VFD Control Address = C34F (hex)
+ Set Registers C34F = 47C (hex) or 1148 (dec) >>> Forward Run
= 847C (hex) or 33916 (dec) >>> Reverse Run
= 43C (hex) or 1084 (dec) >>> Stop
= 4BC (hex) or 1212 (dec) >>> VFD Reset
>>> VFD Frequency Setting Address = C359 (hex)
+ Reference Setting = 0 to 16384(dec) ~ (0 to 100%)
- Output Voltage Address = 16120 – 1 = 16119 (dec)
- Output Frequency Address = 16130 – 1 = 16129 (dec)
- Output Current Address = 16140 – 1 = 16139 (dec)
Mitsubishi QJ71C24N “Modbus RTU” Configuration
Below are the basic steps to set parameters for Mitsubishi QJ71C24N for protocol “Modbus RTU” Communication.
+ Step 1: Create New Project
+ Step 2: I/O Assigment
+ Step 3: Channel 2 (RS485) Parameters Setting
+ Step 4: Sent parameters to QJ71C24N
+ Step 5: “Echoback” Disable
QJ71C24N “Modbus RTU” Protocols Configuration
>>> Protocol No.1: “Func 06 / Write Single Registers”
- Slave Address = “D100”
- Register Adress = “D101”
- Register Value = “D110”
- “Comm. Error” = “D300“
>>> Protocol No.2: “Func 03 / Read Holding Registers”
- Slave Address = “D200”
- Starting Address = “D201”
- Quantity of Registers = “D202”
- Registers Value Response = “D210” (From D210…D335 depending on the number of Registers (D202) to read)
- “Comm. Error” = “D300”
PLC Programming
+ Disable “Echoback” & Error Clear
+ Read/Write Distribution
+ Frequency Setting Command
+ VFD Control Command
+ Data Output Monitoring
+ HMI Interface
Project Video Tutorial
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Related Software and Documents
+ Download Mitsubishi GX-Works 2 Software
+ Q03UDV & HMI Weintek “Connection Tutorial”
+ Download Danfoss FC51 Manual PDF
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