Operation Mode Is Not Changed Properly; Operation Panel Display Is Not Operating; Motor Current Is Too Large - Mitsubishi Electric 800 Series Instruction Manual

6.5.9

Operation mode is not changed properly

Check
Possible cause
points
Input
Start signal (STF or STR) is ON.
signal
Pr.79 Operation mode selection setting is
improper.
Parameter
setting
Operation mode and a writing device do not
correspond.
6.5.10

Operation panel display is not operating

Check
Possible cause
points
Main
circuit
Power is not input.
Control
circuit
Front
Operation panel is not properly connected to
the inverter.
cover
6.5.11

Motor current is too large

Check
Possible cause
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.
Offline auto tuning is not performed under
Advanced magnetic flux vector control, Real
sensorless vector control, or vector control.
When PM sensorless vector control is
selected for a PM motor, and offline auto
tuning is not performed.
Check first when you have a trouble
Countermeasure
Check that the STF and STR signals are off.
When either is ON, the operation mode cannot be changed.
When the Pr.79 is set to "0 (initial value)", the operation mode is
the External operation mode at power ON. To switch to the PU
operation mode, press on the operation panel (press
on the parameter unit (FR-PU07)). At other settings (1 to
4, 6, 7), the operation mode is limited accordingly.
Check Pr.79 Operation mode selection, Pr.338
Communication operation command source, Pr.339
Communication speed command source, Pr.550 NET mode
operation command source selection and Pr.551 PU mode
operation command source selection, and select an
operation mode suitable for the purpose.
Countermeasure
Input the power.
Check if the inverter front cover is installed securely.
Countermeasure
Increase/decrease the Pr.0 Torque boost setting value by
0.5% increments so that stall prevention does not occur.
Set rated frequency of the motor to Pr.3 Base frequency.
Use Pr.19 Base frequency voltage to set the base voltage (for
example, rated motor voltage).
Change Pr.14 Load pattern selectionaccording to the load
characteristic.
Reduce the load weight.
Set Pr.22 Stall prevention operation level (Torque limit
level) higher according to the load. (If Pr.22 is set too high, an
overcurrent trip (E.OC[]) is likely to occur.)
Check the capacities of the inverter and the motor.
Perform offline auto tuning.
Perform offline auto tuning for a PM motor.
PROTECTIVE FUNCTIONS
Refer to
page
43, 421
291
291, 301
Refer to
page
32
21
Refer to
page
589
591
593
―
154, 332
―
426
6
436
653