Operation Mode Is Not Changed Properly; Operation Panel (Fr-Du08) Display Is Not Operating; The Motor Current Is Too Large - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

6.6.9

Operation mode is not changed properly

Check
point
Input
The start signal (STF or STR) is ON.
signal
The Pr.79 Operation mode selection
setting is not appropriate.
Parameter
setting
Operation mode and a writing device do not
correspond.

6.6.10 Operation panel (FR-DU08) display is not operating

Check
point
Main
circuit
The power is not input.
Control
circuit
Front The operation panel is not properly
cover connected to the inverter.

6.6.11 The motor current is too large

Check
point
The torque boost (Pr.0, Pr.46, Pr.112)
setting is not appropriate under V/F
control, so the stall prevention function is
activated.
The V/F pattern is not appropriate when V/
F control is performed. (Pr.3, Pr.14,
Pr.19)
Parameter
setting
The 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 an IPM motor other than MM-
CF, offline auto tuning is not performed.
772
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
Possible cause
Possible cause
Possible cause
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 the
(press the key 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 the 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 the Pr.14 Load pattern selection setting according 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 the IPM motor.
key on the operation panel
Refer to
page
68, 502
370
370, 380
Refer to
page
46
33
Refer to
page
672
673
674
—
235, 409
—
509
519