Mitsubishi Electric MELSEC FX Series - Page 31

Components of Positioning Control and their Roles
FX Positioning Control Systems 3 - 3
300020da.eps
Fig. 3-1: Components of Postioning Control (2)
PLG
SM
 Dedicated to high speed response optimal to positioning control, has
large start torque, large maximum torque and wide variable speed
range 1/1 or more (1/1,000 to 1/5,000).
Servo motor
Sensor, actuator, auxiliary device
Setting / display unit
 Used to write programs to the position
controller, allows setting and display of the
data.
 The actuator (moving part drive mechanism)
is equipped with speed reducer, timing belt,
ball screw and limit switch.
 Diversified auxiliary devices are also
controlled in accordance with positioning.
 The PLC or the positioning controller also
controls auxiliary devices.
 The auxiliary device operation completed
signal is output to the PLC or the position
controller.
When a moving element goes beyond a limit switch
(LS), the motor stops.
Servo motor
In the case of large motor
Cooling fan
Servo
motor
Encoder
(pulse
generator)
When
required
Electro-
magnetic
brake
Auxiliary device such as chuck, drill and cylinder
Speed
reducer
Limit switch
(LS)
Nearpoint
dog switch
Limit switch
(LS)
Moving element
Ball screw
Hand help
programmer
Personal
Computer