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Mitsubishi FX5U “Modbus RTU” LS iG5A VFD Tutorial

Written by plc247.com

Hello friends, the LS iG5A inverter is a compact and economical inverter, the LS – IG5 series is powerful and optimized for performance. It meets the needs of customers in applications: Modbus RTU Communication, PID control, space vector, PWM…

Today plc247.com will guide you to use Mitsubishi FX5U to control LS iG5A inverter via Modbus-RTU (RS485)

Mitsubishi FX5U & LS iG5A “Wiring Diagram”

Note: Use a 120Ω terminal resistor if the communication distance is far

LS iG5A Modbus RTU Configuration

In addition to the basic parameters (frequency, voltage, current, acceleration, deceleration…) we need to set the communication parameters as follows:

  • Drv = 3
  • Frq = 7
  • I59 = 0 (Choose Modbus-RTU)
  • I60 = 1 (Slave No.1)
  • I61 = 3 (baudrate 9600bps)
  • I62 = 0
  • I65 = 2 (Even/1bit)
LS iG5A Modbus-RTU Registers Address
Note: PLC Address Using = “VFD Address – 1”

+ Frequency Reference Address = 5 – 1 = 4 (hex)

+ VFD Control Address = 6 – 1 = 4 (hex)

  • Set Word 5 (hex) = 2 >>> Run Forward
  • Set Word 5 (hex) = 4 >>> Run Reverse
  • Set Word 5 (hex) = 0 >>> Stop

+ Output Current Adress = 9 – 1 = 8 (hex)

+ Output Frequency Address = A – 1 = 9 (hex)

+ Output Voltage Address = B – 1 = A (hex)

PLC Mitsubishi FX5U Modbus-RTU Setting

We need to configure the communication parameters of RS485 Port to be the same as those installed in the LS iG5A inverter.

PLC Programming

+ Reset & Distribution Control

+ VFD Control Command

+ Read Data Response

Project Video Example

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Documentation Requirements

>>> Download Mitsubishi GX Works3 Software
>>> LS iG5A Manual PDF Download (Password Extract: plc247.com)

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