Mitsubishi Electric FR-F820-00046 Instruction Manual page 184

 Adjustment procedure
1.
Change the Pr.820 setting while checking the conditions.
2.
If it cannot be adjusted well, change Pr.821 setting, and perform step
No. Movement / condition
1 Load inertia is too 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.
NOTE
• Pr.830 Speed control P gain 2 and Pr.831 Speed control integral time 2 are enabled 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 (current loop proportional gain) and Pr.835 Torque control integral time 2 (current loop
integral time) are enabled when terminal RT is ON. In this case, replace them for Pr.824 and Pr.825 in the description above.
Set Pr.820 and Pr.821 higher.
If acceleration is slow, raise the setting by 10% and then set the value to 80 to 90% of the
Pr.820
setting immediately before vibration/noise starts occurring.
If overshoots occur, set about 80 to 90% of the maximum value without overshooting while
Pr.821
increasing the setting value by twice.
Set Pr.820 lower and Pr.821 higher.
Set about 80 to 90% of the maximum value without any vibration/noise while decreasing the
Pr.820
setting value by 10%.
If overshoots occur, set about 80 to 90% of the maximum value without overshooting while
Pr.821
increasing the setting value by twice.
Set Pr.820 higher.
If acceleration is slow, set about 80 to 90% of the maximum value without any vibration/
Pr.820
acoustic noise while increasing the setting value by 5%.
Set Pr.821 lower.
Set about 80 to 90% of the maximum value without overshooting or unstable movements while
decreasing the setting value of Pr.821 by half.
Set Pr.821 higher.
Set about 80 to 90% of the maximum value without overshooting or unstable movements while increasing
the setting value of Pr.821 by double.
1
again.
Adjustment method
5.3 Speed control under PM motor control
1
2
3
4
5
6
7
8
9
10
183
5. PARAMETERS