To Perform High Accuracy / Fast Response Operation (Gain Adjustment Of Real Sensorless Vector Control) (Pr. 818 To Pr. 821, Pr. 880) - Mitsubishi Electric FR-A700 Instruction Manual

Simple mode parameter list
5.1.11 To perform high accuracy / fast response operation (gain adjustment of
real sensorless vector control) (Pr. 818 to Pr. 821, Pr. 880)
The ratio of the load inertia to the motor inertia (load inertia moment ratio) 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 re-
sponse 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 inte-
821
gral time 1
880
Load inertia ratio
NOTE The initial values of the control parameters above allow to perform a wide range of applica-
tions.
Maybe you have to change the initial values to optimise the control behaviour. For detailed
information refer to section 6.3.4.
5 - 32
Initial
Setting Range Description
Value
Set the response level.
1: Slow response
2 1–15
to
15: Fast response
0 Without easy gain tuning
With load estimation, with gain calculation (only under vector
0 1
control and real sensorless vector control)
2 With load (Pr. 880) manual input, gain calculation
Set the proportional gain for speed control. (Increasing the
60% 0–1000% value improves trackability in response to a speed command
change and reduces speed variation with disturbance.)
Set the integral time during speed control. (Decrease the value
0.333s 0–20s to shorten the time taken for returning to the original speed if
speed variation with disturbance occurs.)
7 0–200 Set the load intertia ratio to the motor.
Basic settings
Sensorless Sensorless Sensorless Vector Vector Vector