Instruction manual

171
5
PROTECTIVE FUNCTIONS
(2) Minor fault
The output is not shut off when the protective function is activated. You can make
parameter setting to output the minor fault signal. (Set "98" in any of Pr. 190 to Pr. 192
(output terminal function selection). Refer to page 149.)
(3) Warnings
Note:5. The stall prevention operation current can be set as desired. It is factory-set to
150%.
Operation Panel Indication FN FR-PU04-MGI 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 Replace the fan. (Refer to page 183.)
Operation Panel Indication OL FR-PU04-MGI OL
Name Stall prevention (overcurrent)
Description
During
acceleration
If a current of more than 150% (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 150%,
this function increases the frequency again.
During
constant-speed
operation
If a current of more than 150% (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 150%, this
function increases the frequency up to the
set value.
During
deceleration
If a current of more than 150% (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 150%, 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".
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