Mitsubishi Electric FR-A820-00046 Instruction Manual page 311

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
● Adjust in the following procedure:
Change the Pr. 820 setting while checking the conditions.
If it cannot be adjusted well, change Pr. 821 setting, and perform
No. Movement / condition Adjustment method
1 Load inertia is high.
Vibration or acoustic
2 noise are generated
from machines.
3 Response is slow.
Return time (response
4
time) is long.
Overshoots or unstable
5
movements occur.
Tab. 5-36:
NOTES When adjusting the gain manually, set Pr. 819 "Easy gain tuning selection" to "0" (no easy gain tun-
ing) (initial value).
Pr. 830 "Speed control P gain 2" and Pr. 831 "Speed control integral time 2" are valid when terminal
RT is ON. In this case, replace them for Pr. 820 and Pr. 821 in the description above.
FR-A800
Set Pr. 820 and Pr. 821 higher.
If acceleration is slow, raise the setting by 10%s and set a value that satisfies
Pr. 820 the following condition:
The setting immediately before vibration/noise starts occurring × 0.8 to 0.9.
If overshoots occur, raise the setting by double the setting and set a value that
Pr. 821 satisfies the following condition:
The setting where overshoots stop occurring × 0.8 to 0.9.
Set Pr. 820 lower and Pr. 821 higher.
Lower the setting by 10%s and set a value that satisfies the following
Pr. 820 condition:
The setting immediately before vibration/noise starts occurring × 0.8 to 0.9.
If overshoots occur, raise the setting by double the setting and set a value that
Pr. 821 satisfies the following condition:
The setting where overshoots stop occurring × 0.8 to 0.9.
Set Pr. 820 higher.
If acceleration is slow, raise the setting by 5%s and set a value that satisfies the
Pr. 820 following condition:
The setting immediately before vibration/noise starts occurring × 0.8 to 0.9.
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
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
Adjustment procedures for parameter 820 and 821
again.
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