Mitsubishi FR-A800

Causes and corrective actions
PROTECTIVE FUNCTIONS
649
6 5
Operation panel
indication
RB FR-PU07 RB
Name
Regenerative brake pre-alarm (Standard models only)
Description
Appears if the regenerative brake duty reaches or exceeds 85% of the Pr.70 Special regenerative brake
duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E. OV[ ]) occurs.
Check point
• Check if the brake resistor duty is not too high.
• Check that the Pr.30 Regenerative function selection and Pr.70 settings are correct.
Corrective action
• Set the deceleration time longer.
• Check the Pr.30 and Pr.70 settings. (Refer to page 614.)
Operation panel
indication
TH FR-PU07 TH
Name
Electronic thermal relay function pre-alarm
Description
Appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset
level of Pr.9 Electronic thermal O/L relay. If the value reaches 100% of Pr.9 setting, motor overload trip
(E.THM) occurs.
Check point
• Check for large load or sudden acceleration.
• Check that the Pr.9 setting is appropriate. (Refer to page 331.)
Corrective action
• Reduce the load and frequency of operation.
• Set an appropriate value in Pr.9. (Refer to page 331.)
Operation panel
indication
PS FR-PU07 PS
Name
PU stop
Description
• The motor is stopped using under the mode other than the PU operation mode. (To enable
under the mode other than the PU operation mode, set Pr.75 Reset selection/disconnected PU
detection/PU stop selection. Refer to page 259 for details.)
• The motor is stopped by the emergency stop function.
Check point
• Check for a stop made by pressing of the operation panel.
• Check for whether the X92 signal is OFF.
Corrective action
• Turn the start signal OFF and release with .
• Turn ON the X92 signal and OFF the start signal for release.
Operation panel
indication
SL FR-PU07 SL
Name
Speed limit indication
Description
Output if the speed limit level is exceeded during torque control.
Check point
• Check that the torque command is not larger than required.
• Check if the speed limit level is set too low.
Corrective action
• Decrease the torque command value.
• Increase the speed limit level.
Operation panel
indication
CP FR-PU07 CP
Name
Parameter copy
Description
Appears when parameter copy is performed between inverters FR-A820-03160(55K) or lower, FR-A840-
01800(55K) or lower, FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher
Check point
Resetting of Pr.9, Pr.30, Pr.51, Pr.56, Pr.57, Pr.61, Pr.70, Pr.72, Pr.80, Pr.82, Pr.90 to Pr.94, Pr.453, Pr.455,
Pr.458 to Pr.462, Pr.557, Pr.859, Pr.860 and Pr.893 is necessary.
Corrective action
Set the initial value in Pr.989 Parameter copy alarm release.