Mitsubishi Electric FR-F820-00077 Instruction Manual page 847

Protective functions
Check
points
Parameter
setting
Load
FR-F800
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 PM
motor 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.
Check first when you have a trouble
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) 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).
Refer to
page
5-293
5-432
5-303,
5-427
5-163,
5-415,
5-423,
5-432
5-41
5-552
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