YASKAWA SGD7S series, Product Manual

Page: 415 / 629

8.13 Manual Tuning
8.13.1 Tuning the Servo Gains
8-76
8.13 Manual Tuning
This section describes manual tuning.
8.13.1 Tuning the Servo Gains
Servo Gains
In order to manually tune the servo gains, you must understand the configuration and charac-
teristic of the SERVOPACK and adjust the servo gains individually. In most cases, if you greatly
change any one parameter, you must adjust the other parameters again. To check the
response characteristic, you must prepare a measuring instrument to monitor the output wave-
forms from the analog monitor.
The SERVOPACK has three feedback systems (the position loop, speed loop, and current
loop), and the response characteristic must be increased more with the inner loops. If this rela-
tionship is not maintained, the response characteristic will suffer and vibration will occur more
easily.
A sufficient response characteristic is ensured for the current loop. There is never a need for it
to be adjusted by the user.
Outline
You can use manual tuning to set the servo gains in the SERVOPACK to increase the response
characteristic of the SERVOPACK. For example, you can reduce the positioning time for posi-
tion control.
Use manual tuning in the following cases.
•
When tuning with autotuning without a host reference or autotuning with a host reference
does not achieve the desired results
•
When you want to increase the servo gains higher than the gains that resulted from autotun-
ing without a host reference or autotuning with a host reference
•
When you want to determine the servo gains and moment of inertia ratio yourself
You start manual tuning either from the default parameter settings or from the gain settings that
resulted from autotuning without a host reference or autotuning with a host reference.
Applicable Tools
You can monitor the servo gains with the S or with the analog monitor.
Encoder
+

M
PG
+

+

Tf
Po s ition control loop
S peed control loop
S ervomotor
S peed
S peed pattern Movement
reference
Time
Po s ition loop
Deviation
counter
Po s ition
loop gain Kp
S peed
reference
S peed loop
S peed control
s ection
Kv and Ti
Current loop
Current
control
s ection
Power
converter
S ERVOPACK
Kp: Po s ition loop gain (Pn102)
Kv: S peed loop gain (Pn100)
Ti: S peed loop integral time con s tant (Pn101)
Tf: Fir s t s tage fir s t torque reference filter time con s tant (Pn401)
Ho s t controller
(Not provided by Ya s kawa)