Mitsubishi Electric FR-F500 Series Instruction Manual page 187

(2) Minor fault
When the protective function is activated, the output is not shut off. You can make parameter setting to output
the minor fault signal. (Set "98" in any of Pr. 190 to Pr. 195 (output terminal function selection). Refer to page
142)
Operation Panel
Indication
Name
Description
Check point
Corrective action
(3) Warnings
Operation Panel
Indication
Name
Description
Check point
Corrective action
Note 5: The stall prevention operation current may be set as desired. It is factory-set to 120%.
FN
Fan fault
For the inverter which contains a cooling fan, FN appears on the operation panel
when the cooling fan stops due to a fault or operates differently from the setting
of Pr. 244 "cooling fan operation selection".
Check the cooling fan for a fault.
Change the fan.
OL
Stall prevention (Over current)
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function stops the increase in
During frequency until the overload current reduces to prevent the
acceleration inverter from resulting in overcurrent shut-off. When the
overload current has reduced below 120%, this function
increases the frequency again.
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function lowers the frequency
During constant- until the overload current reduces to prevent overcurrent
speed operation shut-off. When the overload current has reduced below
120%, this function increases the frequency up to the set
value.
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function stops the decrease in
During frequency until the overload current reduces to prevent the
deceleration inverter from resulting in overcurrent shut-off. When the
overload current has reduced below 120%, this function
decreases the frequency again.
Check the motor for use under overload.
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".
PROTECTIVE FUNCTIONS
FR-PU04
FR-PU04
173
Fan Failure
OL
5