Mitsubishi Electric FR-E700 Instruction Manual page 458

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Alarm
When an alarm occurs, the output is not shut off. You can also output an alarm signal by making
parameter setting. (Set "98" in any of Pr. 190 to Pr. 192 "Output terminal function selection". Re-
fer to section 6.10.5).
Operation Panel
Indication
Name
Description
Check point
Corrective action
Fault
When a fault occurs, the inverter trips and a fault signal is output.
Operation Panel
Indication
Name
Description
Check point
Corrective action
7 - 8
UV
Undervoltage
If the power supply voltage of the inverter decreases, the control circuit will not perform nor-
mal functions. In addition, the motor torque will be insufficient and/or heat generation will
increase. To prevent this, if the power supply voltage decreases below about 230VAC, this
function stops the inverter output and displays. An alarm is reset when the voltage returns
to normal.
Check that the power supply voltage is normal.
Check that the power supply voltage is normal.
FN
Fan fault
For the inverter that contains a cooling fan, "FN" appears on the operation panel when the
cooling fan stops due to an alarm or different operation from the setting of Pr. 244 "Cooling
fan operation selection".
Check the cooling fan for an alarm.
Replace the cooling fan.
E.OC1
Over current shut-off during acceleration
When the inverter output current reaches or exceeds approximately 230% of the rated cur-
rent during acceleration, the protective circuit is activated and the inverter trips.
1) Check for sudden acceleration.
2) Check that the downward acceleration time is not long in vertical lift application.
3) Check for output short circuit/ground fault.
4) Check that stall prevention operation is correct.
5) Check that regeneration is not performed frequently. (Check that the output voltage
becomes larger than the V/f reference value at regeneration and overcurrent occurs due
to the high voltage.)
1) Increase the acceleration time. (Shorten the downward acceleration time in vertical lift
application.)
2) When "E.OC1" is always lit at starting, disconnect the motor once and start the inverter.
If "E.OC1" is still lit, contact your sales representative.
3) Check the wiring to make sure that output short circuit/ground fault does not occur.
4) Perform a correct stall prevention operation. (Refer to section 6.3.5).
5) Set base voltage (rated voltage of the motor, etc.) in Pr. 19 "Base frequency voltage".
(Refer to section 6.5.1.)
FR-PU04
—
FR-PU07
FR-PU04
FN
FR-PU07
FR-PU04
OC During Acc
FR-PU07
Troubleshooting