Mitsubishi Electric FR-A500 Instruction Manual page 208

Operation Panel
E.ECT
Indication
Name Wire break detection
The inverter output is stopped if the encoder signal is turned off during orientation,
Description
encoder feedback or vector control executed with the FR-A5AP.
Check point Check for encoder signal wire break.
Corrective action Repair wire break.
(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 158)
Operation Panel
Indication
Name Fan fault
For the inverter which contains a cooling fan, FN appears on the operation panel
Description 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.
(3) Warnings
Operation Panel
Indication
Name Stall prevention (Over current)
During
acceleration
During constant-
Description
speed operation
During
deceleration
Check point Check the motor for use under overload.
The acceleration time may change. Increase the stall prevention operation level with
Pr. 22 "stall prevention operation level" or disable stall prevention with Pr. 156 "stall
Corrective action
prevention operation selection".
Note: 5. The stall prevention operation current may be set as desired. It is factory-set to 150%.
FN
OL
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.
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.
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.
PROTECTIVE FUNCTIONS
FR-PU04
FR-PU04
FR-PU04
199
No encoder signal
Fan fault
OL
5