Mitsubishi Electric FR-A800, Instruction Manual

Page: 283 / 1042

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
FR-A800 5 - 103
●
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 again.
No. Movement / condition Adjustment method
1 Load inertia is 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
Tab. 5-36: Adjustment procedures for parameter 820 and 821
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.