To Perform High Accuracy/Fast Response Operation; (Pr. 818 To Pr. 821, Pr. 830, Pr. 831, Pr. 880) - Mitsubishi Electric FR-A700 Instruction Manual

Speed control by real sensorless vector control, vector control
6.3.3 To perform high accuracy/fast response operation (gain adjustment of
real sensorless vector control and vector control)

(Pr. 818 to Pr. 821, Pr. 830, Pr. 831, Pr. 880)

The ratio of the load inertia to the motor inertia (load inertia moment) is estimated in real time
from the torque command and speed during motor operation by vector control. As optimum gain
of speed control and position control are automatically set from the load inertia ratio and
response level, time and effort of making gain adjustment are reduced. (Easy gain tuning)
When the load inertia ratio can not be estimated due to load fluctuation or real sensorless vector
control is exercised, control gain is automatically set by manually inputting the load inertia ratio.
Make a manual input adjustment when vibration, noise or any other unfavorable phenomenon
occurs due to large load inertia or gear backlash, for example, or when you want to exhibit the
best performance that matches the machine.
Pr.
Name
No.
Easy gain tuning
818
response level set-
ting
Easy gain tuning
819
selection
Speed control P
820
gain 1
Speed control
821
integral time 1
Speed control P
830
gain 2
Speed control
831
integral time 2
880
Load inertia ratio
6 - 88
Initial
Setting Range
Value
2 1–15
0
1
0
2
60% 0–1000%
0.333s 0–20s
0–1000%
9999
9999
0–20s
9999
9999
7 0–200
Description
Set the response level.
1: Slow response
to
15: Fast reponse
Without easy gain tuning
With load estimation, with gain calcu-
lation
(valid only during vector control)
With load (Pr. 880) manual input,
gain calculation
Set the proportional gain for speed
control.
(Increasing the value improves track-
ability in response to a speed com-
mand change and reduces speed
variation with disturbance.)
Set the integral time during speed
control.
(Decrease the value to shorten the
time taken for returning to the origi-
nal speed if speed variation with dis-
turbance occurs.)
Second function of Pr. 820
(valid when RT signal is on)
No function
Second function of Pr. 821
(valid when RT signal is on)
No function
Set the load intertia ratio to the
motor.
Sensorless Sensorless Sensorless Vector Vector Vector
Parameters referred to
—
Parameter
Refer to
Section