203
PROTECTIVE FUNCTIONS
5
(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 162)
(3) Warnings
Note: 5. The stall prevention operation current may be set as desired. It is factory-set to 150%.
Operation Panel
Indication
E.ECT FR-PU04 No encoder signal
Name Wire break detection
Description
The inverter output is stopped if the encoder signal is turned off during orientation,
encoder feedback or vector control executed with the FR-A5AP.
Check point Check for encoder signal wire break.
Corrective action Repair wire break.
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 Replace the fan.
Operation Panel
Indication
OL FR-PU04 OL
Name Stall prevention (Over current)
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 time may change. Increase the stall prevention operation level
using Pr. 22 "stall prevention operation level" or make the stall prevention
inoperative using Pr. 156 "stall prevention operation selection".
