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Causes and corrective actions
Operation panel
RB
indication
Name
Regenerative brake prealarm
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. OV_) occurs.
Description
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. 192 (output terminal
function selection). (
1. Check that the brake resistor duty is not high.
Check point
2. Check that the Pr. 30 Regenerative function selection and Pr. 70 Special regenerative brake duty settings are correct.
1. Increase the deceleration time.
Corrective action
2. Check that the Pr. 30 Regenerative function selection and Pr. 70 Special regenerative brake duty settings.
Operation panel
TH
indication
Name
Electronic thermal relay function prealarm
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.
The THP signal can be simultaneously output with the [TH] display. For the terminal used for THP signal output,
Description
assign the function by setting "8 (positive logic) or 108 (negative logic)" in any of Pr. 190 to Pr. 192 (output terminal
function selection). (
1. Check for large load or sudden acceleration.
Check point
2. Is the Pr. 9 Electronic thermal O/L relay setting is appropriate? (Refer to page 41)
1. Reduce the load and frequency of operation.
Corrective action
2. Set an appropriate value in Pr. 9 Electronic thermal O/L relay. (Refer to page 41)
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 setting.
Check point
(
Corrective action
Setting "0" in Pr. 503 Maintenance timer erases the signal.
Operation panel
UV
indication
Name
Undervoltage
If the power supply voltage of the inverter decreases, the control circuit will not perform normal functions. In addition,
the motor torque will be insufficient and/or heat generation will increase. To prevent this, if the power supply voltage
decreases below about 115VAC (about 230VAC for 400V class, about 58VAC for 100V class), this function stops the
Description
inverter output and displays
An alarm is reset when the voltage returns to normal.
Check point
Check that the power supply voltage is normal.
Corrective action
Check the power supply system equipment such as power supply.
(3) Alarm
When an alarm occurs, the output is not shut off. You can also output an alarm signal by making parameter setting.
(Set "98" in any of Pr. 190 to Pr. 192 (output terminal function selection).
(applied)).
Operation panel
FN
indication
Name
Fan fault
For the inverter that contains a cooling fan,
Description
an alarm or different operation from the setting of Pr. 244 Cooling fan operation selection.
Check point
Check the cooling fan for an alarm.
Corrective action
Check for fan alarm. Please contact your sales representative.
100
FR-PU04
FR-PU07
Refer to the chapter 4 of the Instruction Manual (applied)).
FR-PU04
FR-PU07
Refer to the chapter 4 of the Instruction Manual (applied)).
FR-PU04
FR-PU07
Refer to the chapter 4 of the Instruction Manual (applied)).
FR-PU04
FR-PU07
.
FR-PU04
FR-PU07
RB
TH
——
MT
——
Refer to the chapter 4 of the Instruction Manual
FN
appears on the operation panel when the cooling fan stops due to

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