Mitsubishi Electric FR-A720-0.4K Instruction Manual page 158

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
Trips the inverter when the output current exceeds the setting of Pr. 150 Output current detection level.
Description 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.
Check point
(Refer to Chapter 4 of
Operation Panel
E.IOH
Indication
Name
Inrush current limit circuit fault
Stops the inverter output when the resistor of inrush current limit circuit overheated. The inrush current
Description
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 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.
Corrective action
If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
E.SER
Indication
Name 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
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 fault
Stops the inverter output when a 30mA or higher current or a 7.5V or higher voltage is input to terminal
Description
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
Check point
input switch. (Refer to Chapter 4 of
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 fault
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 Chapter 4 of
FR-PU04
E.P24
FR-PU07
FR-PU04 Fault 14
FR-PU07 OC detect level
the Instruction Manual (Applied).)
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
the Instruction Manual (Applied).)
FR-PU04 Fault 14
FR-PU07 USB comm error
the Instruction Manual (Applied))
Causes and corrective actions
4
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