Mitsubishi Electric FR-A720-0.4K Instruction Manual page 409

Operation Panel
E.P24
Indication
Name
24VDC power output short circuit
When the 24VDC power output from the PC terminal is shorted, this function shuts off the power output.
Description
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 point
· Check for a short circuit in the PC terminal output.
Corrective action
· Remedy the earth (ground) fault portion.
Operation Panel
E.CDO
Indication
Name
Output current detection value exceeded
This function is activated when the output current exceeds the Pr. 150 Output current detection level
Description
setting.
Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay time,
Check point
Pr. 166 Output current detection signal retention time, Pr. 167 Output current detection operation selection.
(Refer to page 239.)
Operation Panel
E.IOH
Indication
Name Inrush current limit circuit alarm
This function is activated when the resistor of the inrush current limit circuit overheats. The inrush
Description
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
Check point
contactor (FR-A740-110K or more) 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.
Corrective action
If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
E.SER
Indication
Name Communication error (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
Description
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 point
Check the RS-485 terminal wiring.
Corrective action
Perform wiring of the RS-485 terminals properly.
Operation Panel
E.AIE
Indication
Name Analog input error
Appears when 30mA or more is input or a voltage (7.5V or more) is input with the terminal 2/4 set to
Description
current input.
Check the setting of Pr. 73 Analog input selection, Pr. 267 Terminal 4 input selection and voltage/current
Check point
input switch. (Refer to page 275.)
Either give a frequency command by current input or set Pr. 73 Analog input selection, Pr. 267 Terminal 4
Corrective action
input selection, and voltage/current input switch to voltage input.
Operation Panel
E.USB
Indication
Name
USB communication error
When the time set in Pr. 548 USB communication check time interval has broken, this function stops the
Description
inverter output.
Check point Check the USB communication cable.
· Check the Pr. 548 USB communication check time interval setting.
· Check the USB communication cable.
Corrective action
· Increase the Pr. 548 USB communication check time interval setting. Or, change the setting to 9999.
(Refer to page 343)
Causes and corrective actions
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
5
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