Mitsubishi Electric MELSERVO-J2M series, Instruction Manual

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6. GENERAL GAIN ADJUSTMENT
6.3 Manual mode 1 (simple manual adjustment)
If you are not satisfied with the adjustment of auto tuning, you can make simple manual adjustment with
three DRU parameters.
6.3.1 Operation of manual mode 1
In this mode, setting the three gains of position control gain 1 (PG1), speed control gain 2 (VG2) and
speed integral compensation (VIC) automatically sets the other gains to the optimum values according to
these gains.
PG1
VG2
VIC
PG2
VG1
GD2
Automatic setting
User setting
Therefore, you can adjust the model adaptive control system in the same image as the general PI control
system (position gain, speed gain, speed integral time constant). Here, the position gain corresponds to
PG1, the speed gain to VG2 and the speed integral time constant to VIC. When making gain adjustment
in this mode, set the load inertia moment ratio (DRU parameter No. 12) correctly.
6.3.2 Adjustment by manual mode 1
POINT
If machine resonance occurs, adaptive vibration suppression control (DRU
parameter No. 25) or machine resonance suppression filter (DRU parameter
No. 18) may be used to suppress machine resonance. (Refer to Section 7.2,
7.3.)
(1) For speed control
(a) Parameters
The following parameters are used for gain adjustment:
DRU parameter No. Abbreviation Name
12 GD2 Ratio of load inertia moment to servo motor inertia moment
16 VG2 Speed control gain 2
17 VIC Speed integral compensation
(b) Adjustment procedure
Step Operation Description
1
Set an estimated value to the ratio of load inertia moment to servo
motor inertia moment (DRU parameter No. 12).
2
Increase the speed control gain 2 (DRU parameter No. 16) within the
vibration- and unusual noise-free range, and return slightly if vibration
takes place. Increase the speed control gain.
3
Decrease the speed integral compensation (DRU parameter No. 17)
within the vibration-free range, and return slightly if vibration takes
place. Decrease the time constant of the speed
integral compensation.
4
If the gains cannot be increased due to mechanical system resonance or
the like and the desired response cannot be achieved, response may be
increased by suppressing resonance with adaptive vibration
suppression control or machine resonance suppression filter and then
executing steps 2 and 3. Suppression of machine resonance
Refer to Section 7.2, 7.3.
5
While checking the settling characteristic and rotational status, fine-
adjust each gain. Fine adjustment