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7 - 1 7. SPECIAL ADJUSTMENT FUNCTI ONS 7. SPECIAL ADJUSTMENT FUNCTIONS POINT The functions given in this chapter need not be used generally. Use them if you are not satisfied with the machine status after making adju stm…

6 - 12

6. GENERAL GAIN ADJUSTMENT

6.5 Differences between MELSERVO-J2-Super and MELSERVO-J3 in auto tuning

To meet higher response demands, the MELSERVO-J3 series has been changed in response level setting

range from the MELSERVO-J2S-Super series. The following table lists comparison of the response level

setting.

MELSERVO-J2-Super MELSERVO-J3

Parameter No.9 setting

Guideline for machine resonance

frequency [Hz]

Parameter No.PA09 setting

Guideline for machine resonance

frequency [Hz]

1 10.0

2 11.3

3 12.7

1 15 4 14.3

5 16.1

6 18.1

2 20 7 20.4

8 23.0

3 25 9 25.9

4 30 10 29.2

11 32.9

5 35 12 37.0

13 41.7

6 45 14 47.0

7 55 15 52.9

16 59.6

8 70 17 67.1

18 75.6

9 85 19 85.2

20 95.9

A 105 21 108.0

22 121.7

B 130 23 137.1

C 160 24 154.4

25 173.9

D 200 26 195.9

27 220.6

E 240 28 248.5

29 279.9

F 300 30 315.3

31 355.1

32 400.0

Note that because of a slight difference in gain adjustment pattern, response may not be the same if the

resonance frequency is set to the same value.

7 - 1

7. SPECIAL ADJUSTMENT FUNCTIONS

POINT

The functions given in this chapter need not be used generally. Use them if

you are not satisfied with the machine status after making adjustment in the

methods in chapter 7.

If a mechanical system has a natural resonance point, increasing the servo system response level may cause

the mechanical system to produce resonance (vibration or unusual noise) at that resonance frequency.

Using the machine resonance suppression filter and adaptive tuning can suppress the resonance of the

mechanical system.

7.1 Function block diagram

Parameter

No.PB23

Parameter

No.PB16

Parameter

No.PB01

Adaptive tuning

Manual setting

Speed

control

Machine resonance

suppression filter 2

Encoder

Current

command

Low-pass

filter

Servo

motor

Machine resonance

suppression filter

7.2 Adaptive filter

(1) Function

Adaptive filter

(adaptive tuning) is a function in which the servo amplifier detects machine vibration for a

predetermined period of time and sets the filter characteristics automatically to suppress mechanical system

vibration. Since the filter characteristics (frequency, depth) are set automatically, you need not be conscious

of the resonance frequency of a mechanical system.

Mechanical

system

response

level

Mechanical

system

response

level

Machine resonance point

Frequency Frequency

Notch

depth

Notch

depth

Notch frequency Notch frequency

Frequency Frequency

When machine resonance is large and frequency is low When machine resonance is small and frequency is high

POINT

The machine resonance frequency which adaptive tuning mode can respond

to is about 100 to 2.25kHz. Adaptive vibration suppression control has no

effect on the resonance frequency outside this range.

Adaptive vibration suppression control may provide no effect on a mechanical

system which has complex resonance characteristics.

7 - 2

7. SPECIAL ADJUSTMENT FUNCTIONS

(2) Parameters

The operation of adaptive tuning mode (parameter No.PB01).

Filter tuning mode selection

000

Parameter No.PB01

Setting Filter adjustment mode Automatically set parameter

0 Filter OFF (Note)

1 Filter tuning mode

Parameter No.PB13

Parameter No.PB14

2 Manual mode

Note. Parameter No.PB19 and PB20 are fixed to the initial values.