Mitsubishi FR-A500 Series - 6.1 Standard Specifications

PROTECTIVE FUNCTIONS
189
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, PLG 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 light fault signal. (Set "98" in any of Pr. 190 to Pr. 195 (output terminal function selection). Refer to page
150)
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.
(3) Warnings
Operation Panel
Indication
OL
FR-PU04
OL
Name
Stall prevention (Over current)
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.
Description
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".
Note 5: The stall prevention operation current may be set as desired. It is factory-set to 150%.
5