Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual page 82

Operation Panel
RB
Indication
Name
Regenerative brake prealarm
Appears if the regenerative brake duty reaches or exceeds 85% of the Pr. 70 "special regenerative
Description
brake duty" value. If the regenerative brake duty reaches 100%, a regenerative overvoltage
(E. OV_) occurs.
• Check that the brake resistor duty is not high.
Check point
• Check that the Pr. 30 "regenerative function selection" and Pr. 70 "special regenerative brake
duty" values are correct.
• Increase the deceleration time.
Corrective action
• Check the Pr. 30 "regenerative function selection" and Pr. 70 "special regenerative brake duty"
values.
Operation Panel
TH
Indication
Name Electronic thermal relay prealarm
Appears if the integrating value of the electronic thermal relay reaches or exceeds 85% of the
Description
preset level. If it reaches 100% of the preset level, a motor overload shutoff (E. THM) occurs.
Check point Check for large load or sudden acceleration.
Corrective action Reduce the load weight or the number of operation times.
Operation Panel
MT
Indication
Name
Maintenance signal output
Description
Indicates that the cumulative energization time of the inverter has reached a given time.
Check point
Check that Pr. 890 "maintenance output setting time" has been set. (A short time has been set.)
Corrective action After checking the energization time, write "0" to Pr. 892 "maintenance output signal clear".
Operation Panel
SL
Indication
Name Speed limit indication (speed restriction)
Description Output if the speed restriction level is exceeded during torque control.
• Check that the torque command is not larger than required.
Check point
• Check that the speed restriction level is not low.
Corrective action
Decrease the torque restriction. Increase the speed restriction level.
Operation Panel
Err.
Indication
This alarm appears if:
• The RES signal is on;
• You attempted to make parameter setting in the external operation mode;
• You attempted to change the operation mode during operation;
Description • You attempted to set any parameter value outside its setting range;
• The PU and inverter cannot make normal communication;
• You attempted to make parameter setting during operation (when signal STF or STR is on); or
• You attempted to make parameter setting when Pr. 77 "parameter write disable selection" has
been set to disable parameter write.
Corrective action
Perform run and operation securely.
FR-PU04V RB
FR-PU04V TH
FR-PU04V MT
FR-PU04V SL
78
Errors (Alarms)
6