Bose MR-J2S- B instruction manual For position control, General Gain Adjustment

6.GENERAL GAIN ADJUSTMENT

(c)Adjustment description

1)Speed control gain 2 (parameter No. 16)

This parameter determines the response level of the speed control loop. Increasing this value enhances response but a too high value will make the mechanical system liable to vibrate. The actual response frequency of the speed loop is as indicated in the following expression:

Speed loop response frequency(Hz)	Speed control gain setting
	(1 ratio of load inertia moment to servo motor inertia moment) 2

2)Speed integral compensation (parameter No. 17)

To eliminate stationary deviation against a command, the speed control loop is under proportional integral control. For the speed integral compensation, set the time constant of this integral control. Increasing the setting lowers the response level. However, if the load inertia moment ratio is large or the mechanical system has any vibratory element, the mechanical system is liable to vibrate unless the setting is increased to some degree. The guideline is as indicated in the following expression:

Speed integral	2000 to 3000
composition setting (ms)	Speed control gain 2 setting/ (1 ratio of load inertia moment
	to servo motor inertia moment.)

(2) For position control

(a) Parameters

The following parameters are used for gain adjustment:

Parameter No.	Abbreviation	Name
12	GD2	Ratio of load inertia moment to servo motor inertia moment
13	PG1	Position control gain 1
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 (parameter No. 12).
2	Set a slightly smaller value to the position control gain 1 (parameter
	No. 13).
	Increase the	speed control gain 2 (parameter No. 16) within the	Increase the speed control gain.

3vibration- and unusual noise-free range, and return slightly if vibration takes place.

4	Decrease the speed integral compensation (parameter No. 17) within	Decrease the time constant of the speed
	the vibration-free range, and return slightly if vibration takes place.	integral compensation.
5	Increase the position control gain 1 (parameter No. 13).	Increase the position control gain.
	If the gains cannot be increased due to mechanical system resonance or	Suppression of machine resonance
	the like and the desired response cannot be achieved, response may be	Refer to Section 7.2 and 7.3.

6increased by suppressing resonance with adaptive vibration suppression control or machine resonance suppression filter and then executing steps 3 to 5.

7	While checking the settling characteristic and rotational status, fine- Fine adjustment
	adjust each gain.

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