PROTECTIVE FUNCTIONS
171
Operation Panel
Indication oL FR-PU04 oL
Name Stall prevention (overvoltage)
Description During
deceleration
If the regenerative energy of the motor increases too much
to exceed the brake capability, this function stops the
decrease in frequency to prevent overvoltage shut-off. As
soon as the regenerative energy has reduced, deceleration
resumes.
Check point Check for sudden speed reduction.
Corrective action The deceleration time may change. Increase the deceleration time with Pr. 8
"deceleration time".
Operation Panel
Indication PS FR-PU04 PS
Name PU stop
Description A stop made by pressing the STOP
RESET key of the PU has been set in Pr. 75 "PU
stop selection".
Check point Check for a stop made by pressing the STOP
RESET key of the operation panel.
Corrective action Refer to page 100.
Operation Panel
Indication TH FR-PU04 TH
Name Electronic overcurrent protection prealarm
Description This alarm appears if the cumulative value of the electronic overcurrent
protection reaches 85% of the preset level. If it reaches 100% of the preset
level, motor overload shutoff (E.THM) occurs.
Check point Check for large load or sudden acceleration.
Corrective action Reduce the load volume or the frequency of operation.
Operation Panel
Indication Err.
Description
This alarm appears if:
• The RES signal is on.
• You attempted to set any parameter value in the external operation mode.
• You attempted to change the operation mode during operation.
• You attempted to set any parameter value outside its setting range.
• You attempted to set any parameter value during operation
(while signal STF or STR is ON).
• You attempted to make parameter setting when Pr. 77 "parameter write
disable selection" has been set to disable parameter write.
Corrective action Perform operation correctly.