Mitsubishi Electric FR-A720-0.4K Instruction Manual page 427

Causes and corrective actions
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
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
416
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
Trips the inverter when the output current exceeds the setting of Pr. 150 Output current detection level.
This function is available when Pr. 167 Output current detection operation selection is set to "1". When the
initial value (Pr. 167 = "0") is set, this protective function is not available.
Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay time,
Pr. 166 Output current detection signal retention time, Pr. 167 Output current detection operation selection.
(Refer to page 248.)
E.IOH
Inrush current limit circuit fault
Stops the inverter output when the resistor of inrush current limit circuit overheated. The inrush current
limit circuit failure
· Check that frequent power ON/OFF is not repeated.
· Check that the primary side fuse (5A) in the power supply circuit of the inrush current limit circuit
contactor (FR-A740-110K or higher) is not fused.
· 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.
E.SER
Communication fault (inverter)
This function stops the inverter output when communication error occurs consecutively for more than
permissible retry count when a value other than "9999" is set in Pr. 335 RS-485 communication retry count
during RS-485 communication from the RS-485 terminals. This function also stops the inverter output if
communication is broken for the period of time set in Pr. 336 RS-485 communication check time interval.
Check the RS-485 terminal wiring.
Perform wiring of the RS-485 terminals properly.
E.AIE
Analog input fault
Stops the inverter output when a 30mA or higher current or a 7.5V or higher voltage is input to terminal
2 while the current input is selected by Pr. 73 Analog input selection, or to terminal 4 while the current
input is selected by Pr. 267 Terminal 4 input selection.
Check the setting of Pr. 73 Analog input selection, Pr. 267 Terminal 4 input selection and voltage/current
input switch. (Refer to page 286.)
Either give a frequency command by current input or set Pr. 73 Analog input selection, Pr. 267 Terminal 4
input selection, and voltage/current input switch to voltage input.
E.USB
USB communication fault
When the time set in Pr. 548 USB communication check time interval has broken, this function stops the
inverter output.
Check the USB communication cable.
· Check the Pr. 548 USB communication check time interval setting.
· Check the USB communication cable.
· Increase the Pr. 548 USB communication check time interval setting. Or, change the setting to 9999.
(Refer to page 360)
FR-PU04
E.P24
FR-PU07
FR-PU04 Fault 14
FR-PU07 OC detect level
FR-PU04 Fault 14
FR-PU07 Inrush overheat
FR-PU04 Fault 14
FR-PU07 VFD Comm error
FR-PU04 Fault 14
FR-PU07 Analog in error
FR-PU04 Fault 14
FR-PU07 USB comm error