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16. FULLY CLOSED LOOP SYSTEM
16 - 15
(7) Setting of fully closed loop dual feedback filter
With the initial value (setting = 10) set in [Pr. PE08 Fully closed loop dual feedback filter the dual
feedback filter], make gain adjustment by auto tuning, etc. as in semi closed loop control. While
observing the servo operation waveform with the graph function, etc. of MR Configurator2, adjust the
dual feedback filter.
The dual feedback filter operates as described below depending on the setting.
[Pr. PE08] setting Control mode Vibration Settling time
0 Semi closed loop
1
to
4499
Dual feedback
Not frequently occurs
to
Frequently occurs
Long time
to
Short time
4500 Fully closed loop
Increasing the dual feedback filter setting shortens the settling time, but increases servo motor vibration
since the motor is more likely to be influenced by the load-side encoder vibration. The maximum setting
of the dual feedback filter should be less than half of the PG2 setting.
Reduction of settling time: Increase the dual feedback filter setting.
Droop pulses
Command
Droop pulses
Command
TimeTime
Suppression of vibration: Decrease the dual feedback filter setting.
Droop pulses
Command
Droop pulses
Command
TimeTime