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 Instruction Manual

Check first when you have troubles
● Others
– Check that the settings of Pr. 80 "Motor capacity and Pr. 81 "Number of motor poles" are
correct to the inverter capacity and motor capacity under advanced magnetic flux vector
control, real sensorless vector control or vector control.
– Check that the wiring length is not exceeding 30 m when advanced magnetic flux vector
control, real sensorless vector control or vector control is exercised. Perform offline auto
tuning. (Refer to 6.12.3)
– Check that the wiring length is not too long for V/F control.
– Change the Pr. 19 "Base frequency voltage setting" (about 3%) under V/F control.
7.6.10

Operation mode is not changed properly

● Inspection of load
– Check that the STF or STR signal is off. When it is on, the operation mode cannot be
changed.
● 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, pressing the buttun PU/EXT on the operation panel switches the mode to the PU
operation mode. For other values (1 to 4, 6, 7), the operation mode is limited accordingly.
7.6.11

Operation panel (FR-DU07) display is not operating

● Check that the correct mains power supply is connected to terminals R1/L11 and S1/ L21.
● Check that the operation panel is connected to the inverter securely.
7.6.12

POWER lamp is not lit

● Check that wiring is securely performed and installation is correct.
7.6.13

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".
7 - 30
Troubleshooting