Mitsubishi Electric FR-A700 Instruction Manual page 271

Parameter
Easy gain tuning execution procedure (Pr. 819 = 2 load inertia manual input)
Easy gain tuning (load inertia ratio manual input) is valid only in the speed control under real sen-
sorless vector control or in the speed control or position control mode under vector control.
Set the load inertia ratio to the motor in Pr. 880 "Load inertia ratio".
Set "2" (with easy gain tuning) in Pr. 819 "Easy gain tuning selection". Then, Pr. 820 "Speed
control P gain 1" and Pr. 821 "Speed control integral time 1" are automaticaly set by gain
calculation. Operation is performed in a gain adjusted status from the next operation.
Perform a test run and set the response level in Pr. 818 "Easy gain tuning response level
setting". Increasing the value will improve trackability to the command, but too high value
will generate vibration. (When "2" (parameter write enabled during operation) is set in Pr. 77
"Parameter write selection", response level adjustment can be made during operation.)
NOTES
When "1 or 2" is set in Pr. 819 and then returned the Pr. 819 setting to "0" after tuning is exe-
cuted, tuning results which are set in each parameter remain unchanged.
When good tuning accuracy is not obtained after executing easy gain tuning due to distur-
bance and such, perform fine adjustment by manual input. Set "0" (without easy gain tuning)
in Pr. 819.
The following table indicates the relationship between easy gain tuning function and gain adjust-
ment parameter.
Load inertia ratio (Pr. 880)
Speed control P gain 1
(Pr. 820)
Speed control integral
time 1
(Pr. 821)
Model speed control gain
(Pr. 828)
Position loop gain
(Pr. 422)
Tab. 6-13: Automatically set parameters by easy gain tuning
b
CAUTION:
Performing easy gain tuning with larger inertia than the specified value during vector
control may cause malfunction such as hunting. In addition, when the motor shaft is
fixed with servo lock or position control, bearing may be damaged. To prevent these,
make gain adjustment by manual input without performing easy gain tuning.
FR-A700 EC
Speed control by real sensorless vector control, vector control
Easy Gain Tuning Selection (Pr. 819 ) Setting
0 1
a) Inertia estimation result (RAM) by
easy gain tuning is dispayed.
b) Set the value in the following cases:
¼ Every hour after power-on
¼ When a value other than "1" is set
Manual
in Pr. 819
input
¼ When vector control is changed to
other control (V/f control etc.) using
Pr. 800
c) Write is enabled only during a stop
(manual input)
a) Tuning result (RAM) is displayed.
b) Set the value in the following cases:
¼ Every hour after power-on
¼ When a value other than "1" is set
Manual
in Pr. 819
input
¼ When vector control is changed to
other control (V/f control etc.) using
Pr. 800
c) Write (manual input) disabled
2
Manual input
a) Gain and integral time is cal-
culated when "2" is set in Pr.
819 and the result is set in the
parameter.
b) When the value is read, the
tuning result (parameter set-
ting value) is displayed.
c) Write (manual input) disabled
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