Instruction manual

PROTECTIVE FUNCTIONS
179
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2
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Minor fault
Operation Panel
Indication
FN
FR-PU04 Fan fault
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.
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3
)
Warnings
Operation Panel
Indication
OL
FR-PU04 OL (Stall Prev STP)
Name
Stall prevention (Over current)
During
acceleration
If a current of more than 150% (Note 4) 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 150%, this function
increases the frequency again.
During constant-
speed operation
If a current of more than 150% (Note 4) 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
150%, this function increases the frequency up to the set
value.
Description
During
deceleration
If a current of more than 150% (Note 4) 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 overvoltage shut-off. When the
overload current has reduced below 150%, this function
decreases the frequency again.
Check point Check the motor for use under overload.
Corrective action
The acceleration/deceletion 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 4: The stall prevention operation current may be set as desired. It is factory-set to 150%.
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