Causes And Corrective Actions - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Causes and corrective actions

5.3 Causes and corrective actions

(1) Error message
A message regarding operational troubles is displayed. Output is not shut off.
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
....... Specifications differ according to the date assembled. Refer to page 484 to check the SERIAL number.
Operation Panel
Indication
Name
Description
Check point
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
404
HOLD
Operation panel lock
Operation lock mode is set. Operation other than
Press for 2s to release lock.
LOCD
Password locked
Password function is active. Display and setting of parameter is restricted.
Enter the password in Pr. 297 Password lock/unlock to unlock the password function before operating.
(Refer to page 310.)
Er1
Write disable error
· You attempted to make parameter setting when Pr. 77 Parameter write selection has been set to
disable parameter write.
· Frequency jump setting range overlapped.
· Adjustable 5 points V/F settings overlapped
· The PU and inverter cannot make normal communication
· Check the setting of Pr. 77 Parameter write selection (Refer to page 307.)
· Check the settings of Pr. 31 to 36 (frequency jump). (Refer to page 158.)
· Check the settings of Pr. 100 to Pr. 109 (adjustable 5 points V/F). (Refer to page 164.)
· Check the connection of the PU and inverter.
Er2
Write error during operation
When parameter write was performed during operation with a value other than "2" (writing is enabled
independently of operating status in any operation mode) is set in Pr. 77 and the STF (STR) is ON.
· Check the Pr. 77 setting. (Refer to page 307.)
· Check that the inverter is not operating.
· Set "2" in Pr. 77.
· After stopping operation, make parameter setting.
Er3
Calibration error
Analog input bias and gain calibration values are too close.
Check the settings of C3, C4, C6 and C7 (calibration functions). (Refer to page 294.)
is invalid. (Refer to page 395.)
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