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6. GENERAL GAIN ADJUSTMENT
6.2 Auto tuning
6.2.1 Auto tuning mode
The MELSERVO-J2M has a real-time auto tuning function which estimates the machine characteristic
(load inertia moment ratio) in real time and automatically sets the optimum gains according to that
value. This function permits ease of gain adjustment of the MELSERVO-J2M.
(1) Auto tuning mode 1
The MELSERVO-J2M is factory-set to the auto tuning mode 1.
In this mode, the load inertia moment ratio of a machine is always estimated to set the optimum gains
automatically.
The following DRU parameters are automatically adjusted in the auto tuning mode 1.
DRU parameter No. Abbreviation Name
6 PG1 Position control gain 1
34 GD2 Ratio of load inertia moment to servo motor inertia moment
35 PG2 Position control gain 2
36 VG1 Speed control gain 1
37 VG2 Speed control gain 2
38 VIC Speed integral compensation
POINT
The auto tuning mode 1 may not be performed properly if the following
conditions are not satisfied.
Time to reach 2000r/min is the acceleration/deceleration time constant of 5s or
less.
Speed is 150r/min or higher.
The ratio of load inertia moment to servo motor is not more than 100
times.
The acceleration/deceleration torque is 10% or more of the rated torque.
Under operating conditions which will impose sudden disturbance torque
during acceleration/deceleration or on a machine which is extremely loose,
auto tuning may not function properly, either. In such cases, use the auto
tuning mode 2 or manual mode 1
2 to make gain adjustment.
(2) Auto tuning mode 2
Use the auto tuning mode 2 when proper gain adjustment cannot be made by auto tuning mode 1.
Since the load inertia moment ratio is not estimated in this mode, set the value of a correct load
inertia moment ratio (DRU parameter No. 34).
The following DRU parameters are automatically adjusted in the auto tuning mode 2.
DRU parameter No. Abbreviation Name
6 PG1 Position control gain 1
35 PG2 Position control gain 2
36 VG1 Speed control gain 1
37 VG2 Speed control gain 2
38 VIC Speed integral compensation