
Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
172
???????
Parameters referred to
Pr.3 Base frequency, Pr.19 Base frequency voltage
Pr.72 PWM frequency selection
Pr.80 Motor capacity, Pr.81 Number of motor poles
Pr.125 Terminal 2 frequency setting gain frequency, Pr.126 Terminal 4 frequency setting gain frequency
Pr.359 Encoder rotation direction, Pr.369 Number of encoder pulses, Pr.851 Control terminal option-Number of encoder pulses, Pr.852 Control terminal
option-Encoder rotation direction
Pr.822 Speed setting filter 1
Pr.824 Torque control P gain 1 (current loop proportional gain)
5
Hunting (vibration or
acoustic noise) occurs
in the motor or the
machine.
Speed control gain is too
high.
• Perform easy gain tuning.
• Set
Pr.820
lower and
Pr.821
higher.
• Perform speed feed forward control or model adaptive speed control.
Torque control gain is too
high.
• Set
Pr.824 Torque control P gain 1 (current loop proportional gain)
lower.
Motor wiring is incorrect.
• Check the wiring.
6
Acceleration/
deceleration time is
different from the
setting.
Torque shortage.
• Raise the torque limit.
(Refer to the torque limit for speed control on
• Perform speed feed forward control.
Load inertia is too high.
• Set acceleration/deceleration time suitable for the load.
7
Machine movement is
unstable.
Speed control gain is not
suitable for the machine.
• Perform easy gain tuning.
• Adjust
Pr.820
and
Pr.821
.
• Perform speed feed forward control or model adaptive speed control.
Response is slow because
of the inverter's
acceleration/deceleration
time setting.
• Set the optimum acceleration/deceleration time.
8
Rotation ripple occurs
during the low-speed
operation.
High carrier frequency is
affecting the motor rotation.
• Set
Pr.72
lower.
Speed control gain is too
low.
• Set
Pr.820
higher.
No.
Condition
Cause
Countermeasure
Содержание 800 Series
Страница 11: ...MEMO 10 ...
Страница 17: ...MEMO 16 ...
Страница 95: ...MEMO 94 ...
Страница 671: ...MEMO 670 ...
Страница 681: ...MEMO 680 ...