6.3 If an Alarm Code Appears on the LED Monitor
6-15
[ 16 ] erd Step-out detection/detection failure of magnetic pole position at startup
Phenomenon: Synchronous motor step-out was detected. The magnetic pole position at startup failed to be
detected.
(1) Function code settings do not
agree with the motor
characteristics.
Check whether function codes F04*, F05*, P01*, P02*, P03*, P60*,
P61*, P62*, P63*, P64* agree with the motor constants.
➔ Perform auto-tuning.
(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 (function
code P30*) to the motor type.
(3) Starting frequency (continuation
time) (function code F24) is
insufficient.
Check whether a starting frequency (continuation time) (function code
F24*) is set optimally, after setting the magnetic pole position detection
mode selection (function code 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 (function codes F07, E10, E12,
E14) and a current command value on a start (function code P74*).
➔ Change the acceleration time to match the load.
➔ Increase the current command value at startup.
➔ Increase the control switching level (function code P89) setting.
Check the data of a reference current at starting (function code P74*).
➔ Decrease the reference current at starting.
Set it to 80% or lower when running a motor single unit in a test run
etc.
(6) A phase was missing in the
connection between the inverter
and the motor.
➔ Properly connect the motor to the inverter.
The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".
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