Gain Adjustment; Current Loop Gain; Speed Loop Gain - Mitsubishi Electric MELDAS MDS-R Series Specifications And Instruction Manual

9-2 Gain adjustment

9-2-1 Current loop gain

No. Abbrev.
SV009 IQA
SV010 IDA
SV011 IQG
SV012 IDG

9-2-2 Speed loop gain

(1) Setting the speed loop gain
The speed loop gain (SV005 (VGN1)) is an important parameter for determining the responsiveness
of the servo control. During servo adjustment, the highest extent that this value can be set to becomes
important. The setting value has a large influence on the machine cutting precision and cycle time.
(a) Refer to the following table and set the standard VGN1 according to the size of the entire
(b) If the standard speed gain setting value is exceeded, the current command fluctuation will
Standard
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Parameter name
Current loop q axis leading
compensation
Current loop d axis leading
compensation
Current loop q axis gain
Current loop d axis gain
load inertia (motor and machine load inertia).
increase even if the speed feedback fluctuates by one pulse. This can cause the machine to
vibrate easily, so set a lower value to increase the machine stability.
Mot or unit
250
< HF75, 105 >
200
150
VGN
100
HF105
50
0
100 200 300
Load inert ia scale（%） SV037 Setting value
Mot or unit
500
400
HF302,303
300
Standard
VGN1
200
100
0
100 200 300
Load inertia scale
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9. Adjustment
Explanation
Set the gain of current loop.
As this setting is determined by the motor's electrical
characteristics, the setting is fixed for each type of motor.
Set the standard values for all the parameters depending on each
motor type.
500
400
300
200
100
HF7
400 500 600
A51
A48
HF123,142,223,224
400 500 600
[%]
9 - 4
Motor unit
< HF54 - 354 > The upper
limit value
for A48
HF354
HF204
0
100 200 300 400
Load inertia scale（%） SV037 Setting value
Setting range
1 to 20480
1 to 4096
HF54,104,15
500 600