Instruction manual

208
PROTECTIVE FUNCTIONS
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 using Pr. 8 "deceleration time".
Operation Panel Indication PS FR-PU04 PS
Name PU stop
Description
A stop made by pressing the key of the PU has been set
in Pr. 75 "PU stop selection".
Check point
Check for a stop made by pressing the key of the
operation panel during external operation.
Corrective action Refer to page 130.
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 set any parameter value while parameter
write is being inhibited in Pr. 77 "parameter write disable
selection".
Corrective action Perform operation correctly.
STOP
RESET
STOP
RESET