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Mitsubishi Electric FR-E520 Instruction Manual Page 203

Transistorized inverter.
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(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 163.)
Operation Panel Indication
Name
Description
Check point
Corrective action
(3) Warnings
Operation Panel Indication
Name
Description
Check point
Corrective action
Note:6. The stall prevention operation current can be set as desired. It is factory-set to
150%.
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.
Replace the fan. (Refer to page 205.)
OL
Stall prevention (overcurrent)
During
If a current of more than 150% (Note 6) of
acceleration
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
If a current of more than 150% (Note 6) of
constant-speed
the rated inverter current flows in the motor,
operation
this function lowers the frequency until the
overload
overcurrent shut-off. When the overload
current has reduced below 150%, this
function increases the frequency up to the
set value.
During
If a current of more than 150% (Note 6) of
deceleration
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
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".
193
PROTECTIVE FUNCTIONS
FR-PU04 Fan Failure
FR-PU04 OL
current
reduces
below
150%,
to
prevent
5
this
function

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