Operation Panel (Fr-Du07) Display Is Not Operating; Power Lamp Is Not Lit; Parameter Write Cannot Be Performed - Mitsubishi Electric FR-B-750 to 75K Instruction Manual

5.5.11 Operation panel (FR-DU07) display is not operating

Check that the operation panel is connected to the inverter securely.

5.5.12 POWER lamp is not lit

Check that wiring is securely performed and installation is correct.

5.5.13 Parameter write cannot be performed

Make sure that operation is not being performed (signal STF or STR is not ON).
Make sure that you are not attempting to set the parameter in the external operation mode.
Check Pr. 77 Parameter write selection.
Check Pr. 161 Frequency setting/key lock operation selection.
Check first when you have troubles
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