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IPM motor control <IPM>
4
PARAMETERS
· Adjust in the following procedure:
1) Change the Pr.820 setting while checking the conditions.
2) If it can not be adjusted well, change Pr.821 setting, and perform 1) again.
(2) Troubleshooting
No. Movement/condition Adjustment method
1
Load inertia is too high.
Set Pr.820 and Pr.821 higher.
Pr.820
If acceleration is slow, raise the setting by 10%s and set a value that
satisfies the following condition: The setting immediately before vibration/
noise starts occurring × 0.8 to 0.9
Pr.821
If overshoots occur, raise the setting by double the setting and set a value
that satisfies the following condition: The setting where overshoots stop
occurring × 0.8 to 0.9
2
Vibration or acoustic noise is
generated from machines.
Set Pr.820 lower and Pr.821 higher.
Pr.820
Lower the setting by 10%s and set a value that satisfies the following
condition: The setting immediately before vibration/noise starts occurring ×
0.8 to 0.9
Pr.821
If overshoots occur, raise the setting by double the setting and set a value
that satisfies the following condition: The setting where overshoots stop
occurring × 0.8 to 0.9
3
Response is slow.
Set Pr.820 higher.
Pr.820
If acceleration is slow, raise the setting by 5%s and set a value that satisfies
the following condition: The setting immediately before vibration/noise starts
occurring × 0.8 to 0.9
4
Return time (response time)
is long.
Set Pr.821 lower.
Lower Pr.821 by half the current setting and set a value that satisfies the following
condition: The setting immediately before overshoots or unstable movements stop
occurring × 0.8 to 0.9
5
Overshoots or unstable
movements occur.
Set Pr.821 higher.
Raise Pr.821 by double the current setting and set a value that satisfies the following
condition: The setting immediately before overshoots or unstable movements stop
occurring × 0.8 to 0.9
Condition Possible cause Countermeasure
1
Motor does not run at the
correct speed.
(Command speed and
actual speed differ.)
(1) Speed command from the
controller is different from the
actual speed.
The speed command is
affected by noise.
(2) The command speed and the
speed recognized by the
inverter are different.
(1) Check that the speed command sent from the
controller is correct. Lower Pr.72 PWM frequency
selection.
(2) Adjust bias and gain (Pr.125, Pr.126, C2 to C7) of the
speed command again.
2
The speed does not
accelerate to the
command speed.
(1) Torque shortage
Stall prevention operation is
activated.
(2) Only P (proportion) control is
performed.
(1) -1 Raise the stall prevention operation level. (Refer to
page 91.)
(1) -2 Capacity shortage
(2) Speed deviation occurs under P (proportional) control
when the load is heavy. Select PI control.
3 Motor speed fluctuates.
(1) Speed command varies.
(2) Torque shortage
(3) Speed control gain is not
suitable for the machine.
(Resonance occurs.)
(1) -1 Check that the speed command sent from the
controller is correct. (Take EMC measures.)
(1) -2 Lower Pr.72 PWM frequency selection.
(2) Raise the stall prevention operation level. (Refer to
page 91.)
(3) Adjust Pr.820 and Pr.821 (Refer to page 84.)
4
Hunting (vibration or
acoustic noise) occurs in
the motor or the machine.
(1) Speed control gain is too
high.
(2) Motor wiring is incorrect.
(1) Set Pr.820 lower and Pr.821 higher.
(2) Check the wiring.