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Mitsubishi Electric FR-F740-00023 Instruction Manual: Operation Panel (fr-du07) Display Is Not Operating; Motor Current Is Too Large

F700 series.
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5.5.10 Operation panel (FR-DU07) display is not operating

Check
points
Main
Circuit,
Power is not input.
Control
Circuit
Front
Operation panel is not properly connected to the
cover
inverter.

5.5.11 Motor current is too large

Check
points
Torque boost (Pr. 0, Pr. 46) setting is improper under V/F
control, so the stall prevention function is activated.
V/F pattern is improper when V/F control is performed.
(Pr. 3, Pr. 14, Pr. 19)
Parameter
Setting
Stall prevention function is activated due to a heavy
load.
Possible Cause
Possible Cause
Check first when you have a trouble
Countermeasures
Input the power.
Check if the inverter front cover is installed securely.
The inverter cover may not fit properly when using wires
2
whose size are 1.25mm
or larger, or when using many
wires, and this could cause a contact fault of the
operation panel.
Countermeasures
Increase/decrease Pr. 0 Torque boost setting value by
0.5% increments to the setting.
Set rated frequency of the motor to Pr. 3 Base frequency.
Use Pr. 19 Base frequency voltage to set the base voltage
(e.g. rated motor voltage).
Change Pr. 14 Load pattern selection according to the load
characteristic.
Reduce the load weight.
Set Pr. 22 Stall prevention operation level higher according
to the load. (Setting Pr. 22 too large may result in
frequent overcurrent trip (E.OC ).)
Check the capacities of the inverter and the motor.
Refer
to
page
12
5
Refer
to
page
67
78
80
——
70
——
5
287

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