Under V/F control, Pr.0 Torque boost
setting is not appropriate.
Pr.78 Reverse rotation prevention
selection is set.
The Pr.79 Operation mode selection
setting is incorrect.
The bias and gain (calibration parameter
C2 to C7) settings are not appropriate.
The Pr.13 Starting frequency setting is
greater than the running frequency.
Zero is set in various running frequency
settings (such as for multi-speed operation).
Especially, Pr.1 Maximum frequency is
Pr.15 Jog frequency is lower than Pr.13
Starting frequency for JOG operation.
Operation mode and a writing device do not
The start signal operation selection is set by
Pr.250 Stop selection
The motor has decelerated to a stop when
the power failure time deceleration-to-stop
function is selected.
Auto tuning is being performed.
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
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
Load is too heavy.
The shaft is locked.
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
Select the operation mode suitable for the input methods of the
start command and frequency command.
Check the bias and gain (calibration parameter C2 to C7)
Set the running frequency higher than the one set in Pr.13.
The inverter does not start if the frequency setting signal has a
value lower than that of Pr.13.
Set the frequency command according to the application.
Set Pr.1 higher than the actual frequency used.
The Pr.15 setting should be equal to or higher than the 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 the STF and STR
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 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
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
Reduce the load.
Inspect the machine (motor).
key of the
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble