Operation Mode Is Not Changed Properly; Operation Panel (Fr-Du07) Display Is Not Operating; Power Lamp Is Not Lit; Parameter Write Cannot Be Performed - Mitsubishi Electric FR-A700 Series Instruction Manual

Check first when you have troubles

4.6.10 Operation mode is not changed properly

If the operation mode does not change correctly, check the following:
1) Inspection of load
Check that the STF or STR signal is off.
When it is on, the operation mode cannot be changed.
2) Parameter setting
Check the Pr. 79 setting.
When the Pr. 79 Operation mode selection setting is "0" (initial value), the inverter is placed in the
external operation mode at input power-on. At this time, press
when the parameter unit (FR-PU04/FR-PU07) is used) to switch to the PU operation mode.

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

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

4.6.12 POWER lamp is not lit

Check that wiring is securely performed and installation is correct.

4.6.13 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.
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on the operation panel (press