Causes And Corrective Actions - Mitsubishi Electric FR-D720-0.1K 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
HOLD
indication
Name
Operation panel lock
Description
Operation lock mode is set. Operation other than
Check point
Corrective action
Press
Operation panel
LOCD
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. (Refer to page
Corrective action
164).
Operation panel
Er1
indication
Name Write disable error
You attempted to make parameter setting when Pr. 77 Parameter write selection has been set to disable parameter write.
Description Frequency jump setting range overlapped.
The PU and inverter cannot make normal communication.
Check the setting of Pr. 77 Parameter write selection. (Refer to page 162).
Check point
Check the settings of Pr. 31 to Pr. 36 (frequency jump). (Refer to page 85)
Check the connection of the PU and inverter.
Operation panel
Er2
indication
Name Write error during operation
When parameter write was performed during operation with a value other than "2" (writing is enabled independently
Description
of operation status in any operation mode) is set in Pr. 77 and the STF (STR) is ON.
Check the Pr. 77 setting. (Refer to page 162).
Check point
Check that the inverter is not operating.
Set "2" in Pr. 77.
Corrective action
After stopping operation, make parameter setting.
Operation panel
Er3
indication
Name
Calibration error
Description
Analog input bias and gain calibration values are too close.
Check point Check the settings of C3, C4, C6 and C7 (calibration functions). (Refer to page 154).
Operation panel
Er4
indication
Name Mode designation error
Appears if a parameter setting is attempted in the External or NET operation mode with Pr. 77 ≠ "2".
Description
Appears if a parameter setting is attempted when the command source is not at the operation panel.
Check that operation mode is PU operation mode.
Check the Pr. 77 setting. (Refer to page 162).
Check point
Check if a parameter unit (FR-PU04/FR-PU07) is connected when Pr. 551 = "9999 (initial setting)."
Check the Pr. 551 setting.
After setting the operation mode to the "PU operation mode", make parameter setting. (Refer to page 166)
After setting Pr. 77 = "2", make parameter setting.
Corrective action
Disconnect the parameter unit (FR-PU04/FR-PU07), and make parameter setting.
After setting Pr. 551 = "4", make parameter setting. (Refer to page 175).
256
for 2s to release lock.
is invalid. (Refer to page 238)
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