Operation Mode Is Not Changed Properly; Operation Panel Display Is Not Operating; Motor Current Is Too Large - Mitsubishi Electric FR-D720-008 Instruction Manual

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 display is not operating

Check
points
Main
Wiring or installation is improper.
Circuit
Main
Circuit
Power is not input.
Control
Circuit
Command sources at the PU operation mode is not at
Parameter
the operation panel.
Setting (None of the operation mode displays (
is lit.)

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.
Auto tuning is not performed under General-purpose
magnetic flux vector control.
Possible Cause
Possible Cause
Possible Cause
Check first when you have some troubles
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
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. 551, and select an
operation mode suitable for the purpose.
Countermeasures
Check for the wiring and the installation.
Make sure that the connector is fitted securely across
terminal P/+ to P1.
Input the power.
Check the setting of Pr. 551 PU mode operation command
source selection.
(If parameter unit(FR-PU04/FR-PU07) is connected
)
while Pr. 551 = "9999" (initial setting), all the operation
mode displays (
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.
Perform offline auto tuning.
Refer
to
page
163
when the 163
163,
174
Refer
to
page
14
14
174
) turn OFF.)
Refer
to
page
71
83
85
—
77
—
103
263
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