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111
Speed control by Real sensorless
vector control, vector control
4
PARAMETERS
4
Motor speed is
unstable.
(1) The speed command varies. (1) -1 Check that a correct speed command comes from the
command device. (Take measures against noises.)
(1) -2 Decrease Pr. 72 PWM frequency selection.
(1) -3 Increase Pr. 822 Speed setting filter 1. (Refer to page 292)
(2) Insufficient torque. (2) Increase the torque limit value.
(Refer to torque limit of speed control on page 100)
(3) The speed control gains do not
match the machine. (mechanical
resonance)
(3) -1 Perform easy gain tuning. (Refer to page 106)
(3) -2 Adjust Pr. 820, Pr. 821. (Refer to page 108)
(3) -3 Perform speed feed forward/model adaptive speed
control.
5
Motor or machine
hunts (vibration/
noise is produced).
(1) The speed control gain is high. (1) -1 Perform easy gain tuning. (Refer to page 106)
(1) -2 Decrease Pr. 820 and increase Pr. 821.
(1) -3 Perform speed feed forward control and model adaptive
speed control.
(2) The torque control gain is high. (2) Decrease the Pr. 824 value. (Refer to page 130)
(3) The motor wiring is wrong. (3) Check the wiring
6
Acceleration/
deceleration time
does not match the
setting.
(1) Insufficient torque. (1) -1 Increase the torque limit value.
(Refer to torque limit of speed control on page 100)
(1) -2 Perform speed feed forward control.
(2) Large load inertia. (2) Set the acceleration/deceleration time that meets the load.
7
Machine operation is
unstable
(1) The speed control gains do not
match the machine.
(1) -1 Perform easy gain tuning. (Refer to page 106)
(1) -2 Adjust Pr. 820, Pr. 821. (Refer to page 108)
(1) -3 Perform speed feed forward control and model adaptive
speed control.
(2) Slow response because of
improper acceleration/
deceleration time of the inverter.
(2) Change the acceleration/deceleration time to an optimum
value.
8
Speed fluctuates at
low speed.
(1) Adverse effect of high carrier
frequency.
(1) Decrease Pr. 72 PWM frequency selection.
(2) Low speed control gain. (2) Increase Pr. 820 Speed control P gain 1.
Phenomenon Cause Countermeasures