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PROTECTIVE FUNCTIONS
170
(2) Minor fault
When the protective function is activated, the output is not shut off. You can make parameter setting to output
the light fault signal. (Set "98" in any of Pr. 190 to Pr. 195 (output terminal function selection). Refer to page
140)
Operation Panel
Indication
FN
FR-PU04
Fan Failure
Name
Fan fault
Description
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 point
Check the cooling fan for a fault.
Corrective action
Change the fan.
(3) Warnings
Operation Panel
Indication
OL
FR-PU04
OL
Name
Stall prevention (Over current)
During
acceleration
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function stops the increase in
frequency until the overload current reduces to prevent the
inverter from resulting in overcurrent shut-off. When the
overload current has reduced below 120%, this function
increases the frequency again.
During constant-
speed operation
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function lowers the frequency
until the overload current reduces to prevent overcurrent
shut-off. When the overload current has reduced below
120%, this function increases the frequency up to the set
value.
Description
During
deceleration
If a current of more than 120% (Note 5) of the rated inverter
current flows in the motor, this function stops the decrease in
frequency until the overload current reduces to prevent the
inverter from resulting in overcurrent shut-off. When the
overload current has reduced below 120%, this function
decreases the frequency again.
Check point
Check the motor for use under overload.
Corrective action
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".
Note 5: The stall prevention operation current may be set as desired. It is factory-set to 120%.
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