Operation Mode Is Not Changed Properly; Operation Panel (Fr-Du07) Display Is Not Operating; Motor Current Is Too Large - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Check first when you have a trouble
5.5.9

Operation mode is not changed properly

Check
points
Input
Start signal (STF or STR) is ON.
signal
Pr. 79 setting is improper.
Parameter
Setting
Operation mode and a writing device do not
correspond.

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, Pr. 112) 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 (torque limit) function is activated due to
a heavy load.
Auto tuning is not performed under Advanced magnetic
flux vector control, Real sensorless vector control, or
vector control.
424
Possible Cause
Possible Cause
Possible Cause
Countermeasures
Check that the STF and STR signals are OFF.
When either is ON, the operation mode cannot be
changed.
When Pr. 79 Operation mode selection setting is "0" (initial
value), the inverter is placed in the External operation
mode at input power ON. To switch to the PU operation
mode, press on the operation panel (press
when the parameter unit (FR-PU04/FR-PU07) is used) .
At other settings (1 to 4, 6, 7), the operation mode is
limited accordingly.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 550, Pr. 551, and select
an operation mode suitable for the purpose.
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 (Torque limit 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.
Perform offline auto tuning.
Refer
to
page
313
313
313,
322
Refer
to
page
14
6
Refer
to
page
146
159
161
—
152
(100)
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189