Справочник Пользователя для Mitsubishi Electronics FR-E720-0.1KSC to 15KSC

When a fault occurs in the inverter, the inverter trips and the PU display automatically changes to one of the following fault or
alarm indications.
The error message shows an operational error. The inverter output is not shut off.
Warnings are messages given before faults occur. The inverter output is not shut off.
Alarms warn the operator of failures with output signals. The inverter output is not shut off.
When faults occur, the protective functions are activated to inverter trip and output the fault signals.

Operation has been attempted during the 
operation panel lock.

Press 

 for 2s to release the lock.

Reading/writing of a password-restricted 
parameter has been attempted.

Enter the password in Pr. 297 Password lock/unlock to unlock the 
password function before operating.



Parameter setting has been attempted although 
parameter writing is set to be disabled.



Overlapping range has been set for the 
frequency jump.



PU and the inverter cannot make normal 
communication.



Check the setting of Pr. 77 Parameter write selection.



Check the settings of Pr. 31 to Pr. 36 (frequency jump).



Check the connection of PU and the inverter.

Parameter writing has been attempted while a 
value other than "2" is set in Pr. 77 Parameter write 
selection and the STF (STR) is ON.



Set "2" in Pr. 77 Parameter write selection.



After stopping the operation, set parameters.

Analog input bias and gain calibration values have 
been set too close.

Check the settings of calibration parameters C3, C4, C6 and C7 
(calibration functions).



Parameter setting has been attempted in the 
External or NET operation mode when Pr.77 
Parameter write selection is not "2."



Parameter writing has been attempted when the 
command source is not at the operation panel.



After setting the operation mode to the "PU operation mode," 
set parameters. 



Set "2" in Pr.77 Parameter write selection.



Disconnect the USB cable from the USB connector and the 
parameter unit (FR-PU04/FR-PU07) from the PU connector, 
then set Pr. 551  PU mode operation command source selection = 
"9999 (initial setting)."



Set Pr. 551 PU mode operation command source selection = "4."

The reset signal (RES signal) is ON.
(Inverter output is shutoff.)



Turn OFF the reset command.

The overcurrent stall prevention has been 
activated.



Increase or decrease the Pr. 0 Torque boost setting by 1% and 
check the motor status.



Set the acceleration/deceleration time longer.



Reduce the load. Try Advanced magnetic flux vector control or 
General-purpose magnetic flux vector control.



Check the peripheral devices for faults.



Adjust the Pr. 13 Starting frequency setting. Change the Pr. 14 
Load pattern selection setting.



Set the stall prevention operation current in Pr. 22 Stall 
prevention operation level. (The acceleration/deceleration time 
may change.) Increase the stall prevention operation level 
with Pr. 22 Stall prevention operation level, or disable stall 
prevention with Pr. 156 Stall prevention operation selection. 
(Operation at OL occurrence can be selected using Pr. 156 
Stall prevention operation selection.)

The overvoltage stall prevention function has been 
activated.
(This warning is also output during the 
regeneration avoidance operation.)

Set the deceleration time longer.

The regenerative brake duty has reached 85% of 
the Pr. 70 Special regenerative brake duty setting or 
higher.



Set the deceleration time longer.



Check the Pr.30 Regenerative function selection and Pr. 70 Special 
regenerative brake duty settings.



The cumulative value of the electronic thermal O/L 
relay has reached 85% of the Pr. 9 Electronic 
thermal O/L relay setting or higher.



Reduce the load and frequency of operation.



Set an appropriate value in Pr. 9 Electronic thermal O/L relay.

 on the operation panel has been pressed 

during the External operation.

Turn the start signal OFF and release with 

.

The cumulative energization time has exceeded 
the maintenance output timer set value.

Setting "0" in Pr. 503 Maintenance timer erases the signal.

The voltage at the main circuit power has been 
lowered.

Investigate the devices on the power supply line such as the 
power supply itself.