PM Motor Adjustment
Adjust the PM motor as shown in the table below depending on its operation status and the phenom-
enon.
Operation status Phenomenon Description of adjustment
Adjustment
item
During startup
Motor rotates
in reverse or
rotates slightly.
The motor may rotate slightly in magnetic pole
alignment during startup.
Set 1st PM Motor Starting Method P30 to 1 to
suppress the rotation amount during startup.
When operation is performed with P30 set to 0 or
3, reverse rotation becomes difficult by lowering
P74.
P30
P74
Motor stalls or
causes an
overcurrent
trip.
If the motor stalls during startup, a large current
may flow, which causes an overcurrent trip.
Increase the PM motor starting current value.
Increasing the PM motor starting current value im-
proves the magnetic pole alignment during start-
up, which results in an increase in the startup tor-
que.
However
, setting this parameter to an excessively
large value may cause detection of an overload.
Check the value in the monitor of electronic ther-
mal overload protection for motor (monitor mode:
5_62).
P74
Increase the PM motor starting time value.
This increases the time during which the starting
current flows to improve magnetic pole alignment
during startup, which results in an increase in the
startup torque.
F24
Motor starting
time is too
long.
Set P30 correctly according to the motor in use.
P30
Motor rotating
Rotation is un-
stable.
If the motor rotation is unstable during startup, in-
crease the motor starting current.
However
, setting this parameter to an excessively
large value may cause detection of an overload.
Check the value in the monitor of electronic ther-
mal overload protection for motor (monitor mode:
5_62).
P74
A shock or
overcurrent trip
occurs.
Adjust the speed control gain to a larger value and
the integral time to a smaller value.
d03, d04
Motor is hunt-
ing or vibrat-
ing.
Adjust the speed control gain to a smaller value
and the integral time to a larger value.
d03, d04
Increase the carrier frequency if it is low
. F26
Gradually increase the PM motor d-axis induc-
tance.
Gradually increase the PM motor q-axis induc-
tance.
P61
P62
6 Vector Control and Applied Functions
6-23
M1 Series Standard Type User's Manual (I669)
6-4 PM Motor Mode
6
6-4-4 Adjustment of PM Motor Mode Settings
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