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Positioning Control Components of Positioning Control and Their Roles 3
3-3
PLG
SM
Servo
motor
When
required
Electromag
netic brake
Cooling fan
In the case of large motor
Moving element
Ball screw
Auxiliary device such as chuck, drill and cylinder
Near point
dog switch
Limit switch
(LS)
Limit switch
(LS)
Drive mechanism
When a moving element goes beyond a limit
switch (LS), the motor stops.
Servo motor
Encoder
(pulse
generator)
Servo motor
Speed
reducer
Settin
g
/ display unit
Sensor, actuator,
auxiliary device
• The actuator (movin
g
part drive
mechanism) is equipped with
speed reducer, timin
g
belt, ball
screw and limit switch.
• Diversified auxiliary devices are
also controlled in accordance with
positionin
g
.
• The PLC or the positionin
g
controller also controls auxiliary
devices.
• The auxiliary device operation
completed si
g
nal is output to the
PLC or the position controller.
• Used to write pro
g
rams to the
position controller, allows
settin
g
and display of the data.
• Dedicated to hi
g
h speed response optimal to
positionin
g
control, has lar
g
e start torque, lar
g
e
maximum torque and wide variable speed ran
g
e
1/1 or more (1/1,000 to 1/5,000).
Hand held
Programmer
Personal
Computer
Graphic
Operator
Terminal