Mitsubishi Electric FR-F800 Instruction Manual page 554

Check
Possible cause
points
Under V/F control, Pr.0 Torque boost setting
is improper.
Pr.78 Reverse rotation prevention selection
is set.
Pr.79 Operation mode selection setting is
incorrect.
Bias and gain (calibration parameter C2 to
C7) settings are improper.
Pr.13 Starting frequency setting is greater
than the running frequency.
Frequency settings of various running
frequency (such as multi-speed operation) are
zero.
Especially, Pr.1 Maximum frequency is zero.
Pr.15 Jog frequency is lower than Pr.13
Starting frequency for JOG operation.
Operation mode and a writing device do not
correspond.
Parameter
Start signal operation selection is set by
Setting
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.
Load
Shaft is locked.
Check first when you have a trouble
Countermeasure
Increase the Pr.0 setting by 0.5% increments while observing
the rotation of a motor.
If that makes no difference, decrease the setting.
Check the Pr.78 setting.
Set Pr.78 when you want to limit the motor rotation to only one
direction.
Select the operation mode which corresponds with input
methods of start command and frequency command.
Check the bias and gain (calibration parameter C2 to C7)
settings.
Set running frequency higher than Pr.13.
The inverter does not start if the frequency setting signal is less
than the value set in Pr.13.
Set the frequency command according to the application.
Set Pr.1 higher than the actual frequency used.
Set Pr.15 higher than Pr.13.
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.
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
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).
PROTECTIVE FUNCTIONS
Refer to
page
496
217
200
314
197, 198
222, 245
197, 198,
221
200, 210
335
426
of the operation
341, 423
235, 414,
420, 426
143
508
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553
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