The Delta VFD-M inverter is one of Delta Electronics’ most commonly used inverters. Although it has been around for a long time, today this type of inverter is still trusted by many automation engineers.
Today plc247.com will guide you to use Siemens S7-200 PLC to control Delta VFD-M inverter through Modbus-RTU communication protocol, both devices have built-in RS485 Communication Port.
Siemens S7-200 & Delta VFD-M “Wiring Diagram”
The RS485 communication port of the Delta VFD-M inverter is an RJ11 port, you can use the desk phone Jack to connect to it.
Delta VFD-M Modbus Parameters Setting
In order for the Delta VFD-M inverter to be controlled and monitored using the Modbus-RTU protocol, we need to set the following communication parameters:
- P00: 03 (Frequency Set by RS485)
- P01: 04 ( Control by RS485)
- P88: 01 (Slave Address)
- P89: 01 (Baudrate 9600bps)
- P92: 04 ( Mode 8/1/Even)
- P157: 01 (Modbus-RTU Selection)
Delta VFD-M Registers Address Table
Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 40001“
+ VFD Control Address = 2000 (hex) + 40001 = 8192 (dec) + 40001 = 48193 (dec)
- Set Word “48193” = 18 (dec): Forward Run
- Set Word “48193” = 34 (dec): Reverse Run
- Set Word “48193” = 1 (dec): Stop
+ Frequency Setting Address = 2001 (hex) + 40001= 8193 (dec) + 40001 = 48194 (dec)
In this project, I read 4 registers “Data Output” from the address register:
+ Output Frequency Address = 48452 (dec)
+ Communication Distribution
+ Modbus Configuration
+ Frequency Setting
+ VFD Control Command
+ Data Monitoring
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