Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 1087 / 1218

Protective functions Check first when you have a trouble
FR-A800 6 - 47
6.6.9 Operation mode is not changed properly
6.6.10 Operation panel (FR-DU08) display is not operating
6.6.11 Motor current is too large
Check
points
Possible cause Countermeasure
Refer to
page
Input
signal
Start signal (STF or STR) is ON.
Check that the STF and STR signals are off.
When either is ON, the operation mode cannot
be changed.
2-44, 5-447
Parameter
setting
Pr. 79 "Operation mode selection" setting is
improper.
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 PU/EXT key on the operation panel
(press PU key on the parameter unit (FR-PU07)).
At other settings (1 to 4, 6, 7), the operation
mode is limited accordingly.
5-271
Operation mode and a writing device do
not correspond.
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.
5-271,
5-282
Check
points
Possible cause Countermeasure
Refer to
page
Main
circuit
Power is not input. Input the power. 2-21
Control
circuit
Front
cover Operation panel is not properly connected
to the inverter. Check if the inverter front cover is installed
securely.
2-7
Check
points
Possible cause Countermeasure
Refer to
page
Parameter
setting
Torque boost (Pr. 0, Pr. 46, Pr. 112) setting is
improper under V/F control, so the stall
prevention function is activated. Increase/decrease the Pr. 0 "Torque boost"
setting value by 0.5% increments so that stall
prevention does not occur.
5-688
V/F pattern is improper when V/F control is
performed.
(Pr. 3, Pr. 14, Pr. 19)
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).
5-690
Change Pr. 14 "Load pattern selection"
according to the load characteristic.
5-692
Stall prevention (torque limit) function is
activated due to a heavy load.
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
첸
) is likely to occur.)
5-90,
5-325
Check the capacities of the inverter and the
motor.
⎯
Offline auto tuning is not performed under
Advanced magnetic flux vector control, Real
sensorless vector control, or vector control.
Perform offline auto tuning. 5-72
When PM sensorless vector control is
selected for an IPM motor other than
MM-CF, and offline auto tuning is not
performed.
Perform offline auto tuning for an IPM motor. 5-471