Instruction manual

PROTECTIVE FUNCTIONS
180
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] key of the PU has been set in Pr. 75 "PU
stop selection".
Check point Check for a stop made by pressing the STOP key of the operation panel.
Corrective action Refer to page 90.
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.
• Communication is not made properly between PU and inverter.
• A parameter value was set during operation (while signal STF or STR is ON).
• You attempted to set a parameter value when Pr. 77 "parameter write disable
selection" had been set to disable parameter write.
Corrective action Perform operation correctly.