Hello friends!
Continuing the series of articles using Mitsubishi QJ71C24N to control different devices through the Modbus-RTU communication protocol, today plc247.com continues to guide you to control the PowerFlex 525 inverter.
The Allen-Bradley PowerFlex 525 inverter has a built-in RS485 communication port that makes it easy to connect to it from the QJ71C24N Module.
QJ71C24N & PowerFlex 525 “Connection Diagram”
Below is a diagram of Modbus RS485 communication connection between QJ71C24N and PowerFlex 525
PowerFlex 525 “Modbus RTU” Parameters Setting
To be able to control and monitor the PowerFlex 525 through the Modbus-RTU protocol, we need to set the following parameters:
PowerFlex525 Modbus Registers Address
+ VFD Control Address = 2000 (Hexa)
- Set Word 2000 = 18 >>> Motor Forward Start
= 34 >>> Motor Reverse Start
= 1 >>> Stop
= 8 >>> VFD Fault Reset
+ Frequency Reference Address = 2001 (Hexa)
- Frequency Command Address = 2102 (Hexa)
- Output Frequency Address = 2103 (Hexa)
- Output Current Address = 2104 (Hexa)
- DC-BUS Voltage Address = 2105 (Hexa)
- Output Voltage Address = 2106 (Hexa)
Mitsubishi QJ71C24N “Modbus RTU” Configuration
Here are the basic configuration steps to set parameters for Mitsubishi QJ71C24N
+ Step 1: Create New Project
+ Step 2: I/O Configuration
+ Step 3: Channel.2 Parameters Setting
+ Step 4: Sent Parameters to Module QJ71C24N
+ Step 5: Disable “Echoback”
- Set G450 = 1 (Disable Echoback)
QJ71C24N & PowerFlex 525 “Protocols Setting”
>>> 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
HMI Programming
+ Error Clear & Disable Echoback
+ Communication Distribution
+ Frequency Setting Command
+ VFD Control Command
+ Data Output Monitoring
+ HMI Control Panel
Project Video Tutorial
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References
+ Download Mitsubishi GX-Works 2 Full Software
+ HMI Weintek & Mitsubishi Q03UDV “Connection Tutorial”
+ Download Allen-Bradley PowerFlex 525 Manual PDF
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