Mitsubishi Electric FR-A820-00046 Instruction Manual page 1082

Check first when you have a trouble
Check
points
Parameter
setting
Load
6 - 42
Possible cause
Start signal operation selection is set by Pr. 250
"Stop selection".
The motor has decelerated to a stop when
power failure deceleration stop function is
selected.
Performing auto tuning.
The automatic restart after instantaneous
power failure function or power failure stop
function has been activated.
(Performing overload operation during input
phase loss may cause voltage insufficiency, and
that may result in detection of power failure.)
The motor test operation is selected under
vector control or PM sensorless vector control.
When the FR-HC2, FR-CV, or FR-CC2 is used, the
input logic setting of the X10 signal is incorrect.
Load is too heavy.
Shaft is locked.
Countermeasure
Check the Pr. 250 setting and the connection of
STF and STR signals.
When power is restored, ensure the safety, and
turn OFF the start signal once, then turn ON
again to restart.
When Pr. 261 "Power failure stop selection" = "2
or 12", the motor automatically restarts after
the power is restored.
When offline auto tuning ends, press STOP/
RESET key of the operation panel for the PU
operation. For the External operation, turn OFF
the start signal (STF or STR).
This operation resets the offline auto tuning,
and the PU's monitor display returns to the
normal indication.
(Without this operation, next operation cannot
be started.)
Set Pr. 872 "Input phase loss protection
selection" ="1" (input phase failure protection
active).
Disable the automatic restart after
instantaneous power failure function and
power failure stop function.
Reduce the load.
Increase the acceleration time if the function
was activated during acceleration.
Check the Pr. 800 "Control method selection"
setting.
Set Pr. 599 = "0" (initial value for standard
models and IP55 compatible models) to use the
X10 signal with the NO contact input
specification, and Pr. 599 = "1" (initial value for
separated converter types) to use the X10
signal with the NC contact input specification.
Reduce the load.
Inspect the machine (motor).
Protective functions
Refer to
page
5-447
5-599
5-72,
5-594
5-317,
5-581,
5-590,
5-599
5-61
5-713
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