6. GENERAL GAIN ADJUSTMENT
6 - 8
(c) Adjustment description
1) Speed loop gain (parameter No.PB09)
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.
(1 load to motor inertia moment ratio) 2
Speed loop gain setting
Speed loop response
frequency(Hz)
2) Speed integral compensation (VIC: parameter No.PB10)
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.
2000 to 3000
Speed loop gain setting/ (1 load to motor inertia moment
ratio setting)
Speed integral compensation
setting(ms)
3) Model loop gain (PG1: Parameter No.PB07)
This parameter determines the response level to a position command. Increasing the model loop
gain improves track ability to a position command, but a too high value will make overshooting
liable to occur at the time of setting.
Model loop gain
guideline
Speed loop gain setting
(1 load to motor inertia moment ratio)
to
1
4
1
8
Summary of Contents for MELSERVO-J3W Series
Page 17: ...8 MEMO ...
Page 27: ...1 FUNCTIONS AND CONFIGURATION 1 10 MEMO ...
Page 87: ...4 STARTUP 4 14 MEMO ...
Page 117: ...5 PARAMETERS 5 30 MEMO ...
Page 129: ...6 GENERAL GAIN ADJUSTMENT 6 12 MEMO ...
Page 185: ...10 CHARACTERISTICS 10 8 MEMO ...
Page 241: ...11 OPTIONS AND AUXILIARY EQUIPMENT 11 56 MEMO ...
Page 274: ...13 USING A LINEAR SERVO MOTOR 13 25 1 2 3 4 ...
