Step-out detection/detection failure of magnetic pole position at startup
Phenomena The step-out of PM motor was detected. The magnetic pole position at startup failed to be
detected.
Possible Causes Check and Measures
(1) Function code settings do not
agree with the motor
characteristics.
Check whether F04, F05, P01, P02, P03, P60, P61, P62, P63, P64
agree with the motor constants.
Perform auto-tuning of the inverter for every motor to be used.
(2) Magnetic pole position
detection method is not
appropriate.
Confirm that the magnetic pole position detection mode matches the
motor type.
Match the magnetic pole position detection mode selection (P30) to
the motor type.
(3) Starting frequency (continuation
time) (F24) is insufficient.
Check whether a starting frequency (continuation time) (F24) is set
optimally, after setting the magnetic pole position detection mode
selection (P30) to “0” or “3.”
Set a period of time during which motor can rotate by one or more
revolutions.
F24≥P01/2/F23 (P01: Number of poles, F23: Starting frequency)
(4) Starting torque is insufficient. Check the data of acceleration times (F07, E10, E12, E14) and a current
command value on a start (P74).
Change the acceleration time to match the load.
Increase the current command value at startup.
(5) Load is small. Check the data of a reference current at starting (P74).
Decrease the reference current at starting.
Set it to 80% or lower when running a motor single unit in a test run etc.
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