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Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual Page 294

Fr-e700 series.
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Causes and corrective actions
Operation panel
oL
indication
Name
Stall prevention (overvoltage)
During
Description
deceleration
Check for sudden speed reduction.
Check point
Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886) is used. (Refer to page 261).
Corrective action
The deceleration time may change. Increase the deceleration time using Pr. 8 Deceleration time.
Operation panel
PS
indication
Name
PU stop
Stop with
Description
page 184 .)
Check point
Check for a stop made by pressing
Corrective action
Turn the start signal OFF and release with
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). (Refer to page 145).
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 settings are correct.
Increase the deceleration time.
Corrective action
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.
Description
The THP signal can be simultaneously output with the [TH] display. For the terminal used for THP signal output,
assign the function by setting "8 (positive logic) or 108 (negative logic)" in any of Pr. 190 to Pr. 192 (output terminal
function selection). (Refer to page 145).
Check for large load or sudden acceleration.
Check point
Is the Pr. 9 Electronic thermal O/L relay setting is appropriate? (Refer to page 116)
Reduce the load and frequency of operation.
Corrective action
Set an appropriate value in Pr. 9 Electronic thermal O/L relay. (Refer to page 116)
294
FR-PU04
FR-PU07
If the regenerative energy of the motor becomes excessive to exceed the regenerative energy
consumption capability, this function stops the decrease in frequency to prevent overvoltage trip.
As soon as the regenerative energy has reduced, deceleration resumes.
If the regenerative energy of the motor becomes excessive when regeneration avoidance function
is selected (Pr. 882 =1), this function increases the speed to prevent overvoltage trip.
(Refer to page 261).
FR-PU04
FR-PU07
of the PU is set in Pr. 75 Reset selection/disconnected PU detection/PU stop selection. (For Pr. 75 refer to
of the operation panel.
FR-PU04
FR-PU07
FR-PU04
FR-PU07
oL
PS
.
RB
TH

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