Mitsubishi Electric FR-F820-00077 Instruction Manual page 229

Parameters
● 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. 5-23:
NOTE 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.
Gain adjustment of current controllers for the d axis and the q axis
● Use Pr. 824 "Torque control P gain 1 (current loop proportional gain)" to adjust the proportional
gain of current controllers for the d axis and the q axis. The 100% gain is equivalent to 1000 rad/s.
Setting this parameter higher improves the trackability for current command changes. It also
reduces the current fluctuation caused by external disturbances.
● Use Pr. 825 "Torque control integral time 1 (current loop integral time)" to set the integral time of
current controllers for the d axis and the q axis. If the setting value is small, it produces current
fluctuation against external disturbances, decreasing time until it returns to original current value.
NOTE Pr. 834 "Torque control P gain 2"and Pr. 835 "Torque control integral time 2" are valid when termi-
nal RT is ON. In this case, replace them for Pr. 824 and Pr. 825 in the description above.
FR-F800
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
Speed control under PM motor control
again.
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