Mitsubishi FR-F720-00046-NA Instruction Manual page 354

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Operation Panel
Indication
Name
Description
Check point
Corrective action
344
E. 5
E. 6
E. 7
E.CPU
CPU fault
Stops the inverter output if the communication fault of the built-in CPU occurs.
Check for devices producing excess electrical noises around the inverter.
· Take measures against noises if there are devices producing excess electrical noises around the
inverter.
· Please contact your sales representative.
E.CTE
RS-485 terminal power supply short circuit
When the internal power supply for RS-485 terminals are shorted, this function shuts off the power
output.
At this time, communication from the RS-485 terminals cannot be made.
To reset, enter the RES signal or switch power OFF, then ON again.
· Check that the RS-485 terminals are connected correctly.
· Check the connection of the RS-485 terminals
E.P24
24VDC power output short circuit
When the 24VDC power output from the PC terminal is shorted, this function shuts off the power output.
At this time, all external contact inputs switch OFF. The inverter cannot be reset by entering the RES
signal. To reset it, use the operation panel or switch power OFF, then ON again.
· Check for a short circuit in the PC terminal output.
· Remedy the earth (ground) fault portion.
E.CDO
Output current detection value exceeded
This functions stops the inverter output when the output current exceeds the setting of Pr.150 Output
current detection level, or the output current falls below the setting of Pr.152 Zero current detection level.
This function is active when Pr. 167 Output current detection operation selection is set to "1, 10, 11".
When the initial value (Pr. 167 = "0") is set, this fault does not occur.
Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay
time, Pr. 152 Zero current detection level, Pr. 153 Zero current detection time, Pr. 166 Output current detection
signal retention time, Pr. 167 Output current detection operation selection. (Refer to page 137.)
E.IOH
Inrush current limit circuit fault
Trips when the resistor of the inrush current limit circuit overheats. The inrush current limit circuit fault
· Check that frequent power ON/OFF is not repeated.
· Check that no meltdown is found in the primary side fuse (5A) in the power supply circuit of the
inrush current suppression circuit contactor (FR-F740-03250 or higher) or no fault is found in the
power supply circuit of the contactor.
· Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Configure a circuit where frequent power ON/OFF is not repeated.
If the problem still persists after taking the above measure, please contact your sales representative.
Fault 5
Fault 6
FR-PU04
FR-PU07(-01)
Fault 7
CPU Fault
FR-PU04
E.CTE
FR-PU07(-01)
FR-PU04
E.P24
FR-PU07(-01)
FR-PU04 Fault 14
FR-PU07(-01) OC detect level
FR-PU04 Fault 14
FR-PU07(-01) Inrush overheat