Mitsubishi Electric FR-A720-0.4K Instruction Manual page 418

Operation Panel
RB
Indication
Name
Regenerative brake pre-alarm
Appears if the regenerative brake duty reaches or exceeds 85% of the Pr. 70 Special regenerative brake
duty value. When the setting of Pr. 70 Special regenerative brake duty is the initial value (Pr. 70 = "0"), this
warning does not occur. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E.
Description
OV_) occurs.
The RBP signal can be simultaneously output with the [RB] display. For the terminal used for the RBP
signal output, assign the function by setting "7" (positive logic) or "107" (negative logic) in any of Pr. 190
to Pr. 196 (output terminal function selection). (Refer to page 239)
· 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 function pre-alarm
Appears if the cumulative value of the Pr. 9 Electronic thermal O/L relay reaches or exceeds 85% of the
preset level. If it reaches 100% of the Pr. 9 Electronic thermal O/L relay setting, a motor overload trip (E.
THM) occurs.
Description
The THP signal can be simultaneously output with the [TH] display. For the terminal used for the THP
signal output, assign the function by setting "8" (positive logic) or "108" (negative logic) in any of Pr. 190
to Pr. 196 (output terminal function selection). (Refer to page 239)
· Check for large load or sudden acceleration.
Check point
· Is the Pr. 9 Electronic thermal O/L relay setting is appropriate? (Refer to page 183.)
· Reduce the load weight or the number of operation times.
Corrective action
· Set an appropriate value in Pr. 9 Electronic thermal O/L relay. (Refer to page 183.)
Operation Panel
MT
Indication
Name
Maintenance signal output
Indicates that the cumulative energization time of the inverter has reached a given time.
Description When the setting of Pr. 504 Maintenance timer alarm output set time is the initial value (Pr. 504 = "9999"),
this warning does not occur.
The Pr. 503 Maintenance timer setting is larger than the Pr. 504 Maintenance timer alarm output set time
Check point
setting. (Refer to page 389.)
Corrective action
Setting "0" in Pr. 503 Maintenance timer erases the signal.
Operation Panel
CP
Indication
Name
Parameter copy
Description
Appears when parameters are copied between models with capacities of 55K or lower and 75K or higher.
Resetting of Pr. 9, Pr. 30, Pr. 51, Pr. 52, Pr. 54, Pr. 56, Pr. 57, Pr. 61, Pr. 70, Pr. 72, Pr. 80, Pr. 82, Pr. 90 to Pr.
Check point
94, Pr. 158, 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.
Operation Panel
SL
Indication
Name
Speed limit indication (output during speed limit)
Description Output if the speed limit level is exceeded during torque control.
· Check that the torque command is not larger than required.
Check point
· Check that the speed limit level is not low.
· Decrease the torque command.
Corrective action
· Increase the speed limit level.
Causes and corrective actions
FR-PU04
RB
FR-PU07
FR-PU04
TH
FR-PU07
FR-PU04 ————
FR-PU07 MT
FR-PU04 ————
FR-PU07 CP
FR-PU04 ————
FR-PU07 SL
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