Mitsubishi Electric FR-F700PJ Series, Инструкция по эксплуатации

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91
IPM motor control <IPM>
4
P
ARAM
ETE
R
S
 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
are 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.
(3) Speed control gain is too low.
(1) -1 Raise the stall prevention operation level. (Refer to page
96.)
(1) -2 Capacity shortage
(2) Speed deviation occurs under P (proportional) control
when the load is heavy. Select PI control.
(3) Set Pr. 820 higher.
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 96.)
(3) Adjust
Pr. 820 and Pr. 821 (Refer to page 90.)
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.
5
Acceleration/deceleration time
is different from the setting. (1) Torque shortage
(2) Load inertia is too high. (1) Raise the stall prevention operation level. (Refer to page 96.)
(2) Set acceleration/deceleration time suitable for the load.
6
Machine movement is
unstable.
(1) Speed control gain is not
suitable for the machine.
(2) Response is slow because of
the inverter's acceleration/
deceleration time setting.
(1) Adjust Pr. 820 and Pr. 821 (Refer to page 90.)
(2) Set the optimum acceleration/deceleration time.
7
Rotation ripple occurs
during the low-speed
operation. (1) High carrier frequency is
affecting the motor rotation.
(2) Speed control gain is too low.
(1) Lower
Pr. 72 PWM frequency selection
.
(2) Raise
Pr. 820 Speed control P gain 1
.