Mitsubishi FR-A500 Series Instruction Manual page 204

Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Description
Corrective action
oL
Stall prevention (overvoltage)
If the regenerative energy of the motor increases too much to
During exceed the brake capability, this function stops the decrease
deceleration in frequency to prevent overvoltage shut-off. As soon as the
regenerative energy has reduced, deceleration resumes.
Check for sudden speed reduction.
The deceleration time may change. Increase the deceleration time using Pr. 8
"deceleration time".
PS
PU stop
A stop made by pressing the
stop selection".
Check for a stop made by pressing the
Refer to page 100.
RB
Regenerative brake prealarm
This alarm appears if the regenerative brake duty reaches 85% of the value set
in Pr. 70 "special regenerative brake duty".
Regenerative overvoltage (E.OV_) occurs if the regenerative brake duty reaches
100%.
Check that the brake resistor is not used frequently.
Increase the deceleration time.
TH
Electronic overcurrent protection prealarm
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 for large load or sudden acceleration.
Reduce the load volume or the frequency of operation.
Err.
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.
• Normal communication cannot be made between the PU and inverter.
• 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.
Perform operation correctly.
PROTECTIVE FUNCTIONS
FR-PU04
FR-PU04
STOP
key of the PU has been set in Pr. 75 "PU
RESET
STOP
RESET
FR-PU04
FR-PU04
190
oL
PS
key of the operation panel.
RB
TH