Omron MX2 Series User Manual page 306

6 Vector Control and Applied Functions
Parameter
No.
PM Motor Initial Pole Position Esti-
H131
mation 0V Waiting Times
PM Motor Initial Pole Position Esti-
H132
mation Detection Waiting Times
PM Motor Initial Pole Position Esti-
H133
mation Detection Times
PM Initial Pole Position Estimation
H134
Voltage Gain
Precautions for Correct Use
• For a PM motor, even if the DC injection braking function is enabled, the regenerative energy
is returned to the inverter. If an overvoltage trip occurs during DC injection braking or during
deceleration, consider to use one or more braking resistors.
• If a holding brake is provided, release the brake before running the motor.
If this timing is not correct, the PM motor will stall.
• To improve the control performance of the PM motor, be sure set the Carrier Frequency
(b083) to 8.0 kHz or higher.
• Derating of the output current may be required depending on the installation environment
and the Carrier Frequency (b083) setting. For derating of each inverter model, refer to A-1
Derating on page A-2.
PM Motor Adjustment
Adjust the PM motor as shown in the table below depending on its operation status and the phenome-
non.
Operation status
During startup
6 - 64
Function name
Phenomenon
The motor may rotate slightly in magnetic pole alignment
Motor rotates in
during startup.
reverse or rotates
Enable the initial pole position estimation function (refer to
slightly.
P. 6-66) to suppress the rotation speed during startup.
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 improves
the magnetic pole alignment during startup, which results
in an increase in the startup torque.
Motor stalls or
causes an overcur-
However, setting this parameter to an excessively large
rent trip.
value may cause an overload. Check the value in the Elec-
tronic Thermal Load Rate Monitor (d104).
Increase the PM Motor Starting Time value.
This increases the time during which the starting current
flows to improve the magnetic pole alignment during
startup, which results in an increase in the startup torque.
Motor starting time Enable the initial pole position estimation function (refer to
is too long. P. 6-66) and shorten the motor starting time.
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Data
0 to 255
0 to 255
0 to 255
0 to 200
Adjustment method
Default
Unit
data
10 time
10 time
30 time
100 %
Adjust-
ment item
H123
H117
H118
H118,
H123