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

4.3 Causes and corrective actions

(1) Error message
A message regarding operational troubles is displayed. Output is not shut off.
Operation Panel
Indication
Name
Operation panel lock
Description
Operation lock mode is set. Operation other than
Check point
Corrective action
Press
Operation Panel
Indication
Name Password locked
Description Password function is active. Display and setting of parameter is restricted.
Check point
Enter the password in Pr. 297 Password lock/unlock to unlock the password function before operating.
Corrective action
(Refer to Chapter 4 of
Operation Panel
Indication
Name
Write disable error
· You attempted to make parameter setting when Pr. 77 Parameter write selection has been set to
Description
· 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 Chapter 4 of
· Check the settings of Pr. 31 to 36 (frequency jump). (Refer to Chapter 4 of
Check point
· Check the settings of Pr. 100 to Pr. 109 (adjustable 5 points V/F). (Refer to Chapter 4 of
· Check the connection of the PU and inverter.
Operation Panel
Indication
Name
Write error during operation
When parameter write was performed during operation with a value other than "2" (writing is enabled
Description
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 Chapter 4 of
Check point
· Check that the inverter is not operating.
· Set "2" in Pr. 77.
Corrective action
· After stopping operation, make parameter setting.
Operation Panel
Indication
Name Calibration error
Description
Analog input bias and gain calibration values are too close.
Check the settings of C3, C4, C6 and C7 (calibration functions). (Refer to Chapter 4 of
Check point
Manual (Applied).)
HOLD
for 2s to release lock.
LOCD
the Instruction Manual (Applied).)
Er1
disable parameter write.
(Applied).)
(Applied).)
Manual (Applied).)
Er2
Er3
Causes and corrective actions
is invalid. (Refer to page 51.)
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the Instruction Manual
the Instruction Manual
the Instruction Manual (Applied).)
the Instruction
4
the Instruction
139