LS ELECTRIC L7NHF Series, User Manual

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9. Full-Closed Control
9-2
Function Details
Semi-Closed
Control
It carries out position control based on the encoder information from the motor.
Advantages
Since it is rarely affected by the vibrations of the machine, you can raise the
servo gain to shorten the adjustment time.
Disadvantages
The machine's accuracy can be lowered due to the vibrations of the machine
even when the motor is not running.
Full-Closed
Control
It carries out position control based on information from the position sensor that is separately
mounted on the machine.
Advantages
The machine's accuracy can be controlled regardless of whether the motor is
running or is stationary.
Disadvantages
Since it is easily affected by the vibrations of the machine, it cannot raise the
servo gain too much and the adjustment time may take longer.
Dual-Feedback
Control
It carries out position control using the position sensor information from either the motor or the
machine.
It has advantages when the sampling rate is low in the external encoder.
Advantages
It operates based on the position information from the motor while the motor
is running and from the machine while the motor is stationary to raise the gain
and shorten the adjustment time. It can stop the motor with the accuracy of
the machine to improve control performance.
Disadvantages