Mitsubishi Electric FR-A700 Instruction Manual page 273

Parameter
● Adjustment procedures are as below:
Check the conditions and simultaneously change the Pr. 820 value.
If you cannot make proper adjustment, change the Pr. 821 value and repeat the step above.
No
1
2
3
4
5
Tab. 6-14: Adjustment procedures for parameter 820 and 821
NOTES
When making manual input gain adjustment, set "0" (without easy gain tuning) (initial value)
in Pr. 819 "Easy gain tuning selection".
Pr. 830 "Speed control P gain 2" and Pr. 831 "Speed control integral time 2" are made valid
when the RT terminal is switched on. Make adjustments in the same way as Pr. 820 and
Pr. 821.
FR-A700 EC
Phenomenon/Condition
Load inertia is large
Vibration/noise generated
from mechanical system
Slow response
Long return time
(response time)
Overshoot or unstable phe-
nomenon occurs
Speed control by real sensorless vector control, vector control
Adjustment Method
Set the Pr. 820 and Pr. 821 values a little higher.
When a speed rise is slow, increase the value 10% by 10%
Pr. 820 until just before vibration/noise is produced, and set about 0.8
to 0.9 of that value.
If an overshoot occurs, double the value until an overshoot
Pr. 821
does not occur, and set about 0.8 to 0.9 of that value.
Set the Pr. 820 value a little lower and the Pr. 821 value a little higher.
Decrease the value 10% by 10% until just before vibration/
Pr. 820
noise is not produced, and set about 0.8 to 0.9 of that value.
If an overshoot occurs, double the value until an overshoot
Pr. 821
does not occur, and set about 0.8 to 0.9 of that value.
Set the Pr. 820 value a little higher.
When a speed rise is slow, increase the value 5% by 5% until
Pr. 820 just before vibration/noise is produced, and set about 0.8 to 0.9
of that value.
Set the Pr. 821 value a little lower.
Decrease the Pr. 821 value by half until just before an overshoot or the
unstable phenomenon does not occur, and set about 0.8 to 0.9 of that
value.
Set the Pr. 821 value a little higher.
Double the Pr. 821 value until just before an overshoot or the unstable phe-
nomenon does not occur, and set about 0.8 to 0.9 of that value.
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