How should I connect the 24V external power supply to the inverter?
Connect the 24V external power supply across terminals +24 and SD. The input voltage must be 23.5 to 26.5VDC with input current of 0.7A or less. When the 24V external power supply is connected, FL-net communication can continue while the main power circuit is OFF, and the operation panel will display 'EV' flickering. (Page 15)
From the official Mitsubishi Inverter FL Remote Communication System manual, page 15
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