Mitsubishi Electric FR-A800, Instruction Manual

Page: 281 / 1042

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
FR-A800 5 - 101
Parameters set automatically by easy gain tuning
The following table shows the relationship between the easy gain tuning function and gain adjust-
ment parameters.
Easy gain tuning selection (Pr. 819) setting
0 1 2
Pr. 880 Load inertia ratio
Manual
input
a) The inertia calculation result (RAM) using
easy gain tuning is displayed.
b) The parameter is set at the following times.
앫
Every hour after turning ON the power
앫
When Pr. 819 is set to a value other than
"1"
앫
After changing to a control other than
vector control (such as V/F control)
using Pr. 800
c) Write (manual input) is available only
during a stop.
Manual input
Pr. 820 Speed control P
gain 1
Pr. 821 Speed control
integral time 1
Pr. 828 Model speed
control gain
Pr. 422 Position control
gain
Pr. 446 Model position
control gain
Manual
input
a) The tuning result (RAM) is displayed. a) Gain is calculated when
Pr. 819 is set to "2", and the
result is set in the parameter.
b) The parameter is set at the following times.
Every hour after turning ON the power
앫
When Pr. 819 is set to a value other than
"1"
앫
After changing to a control other than
vector control (such as V/F control)
using Pr. 800
b) When read, the tuning result
(parameter setting value) is
displayed.
c) Write (manual input) is not available c) Write (manual input) is not
available
Tab. 5-35: Automatically set parameters by easy gain tuning
NOTES If easy gain tuning is executed at an inertia equal to or higher than the specified value under vec-
tor control, a fault such as hunting may occur. Also, if the motor shaft is fixed by the servo lock or
position control, the bearing may be damaged. In this case, do not perform easy gain tuning.
Adjust the gain manually.
The load inertia ratio is only calculated under vector control.