Mitsubishi Electric MELSEC iQ-F Series User Manual page 8

FX Series Programmable Controllers
Introduction to FX Positioning Control Systems
Type of machine
Lifter moving-
up/down
Cart travel
control
Carrier robot
14
Description
As negative load is applied on the
servo motor in positioning of the lifter
in the vertical direction,
regenerative option is also used.
In order to hold the lifter stationary
and prevent drop of the lifter by
power interruption, a servo motor
with an electromagnetic brake is
used.
A servo motor is mounted in the
travel cart as the drive source.
A mechanism such as rack and
pinion is adopted to prevent slippage
between the wheels and rails.
After the conveyor stops, the 2-axis
servo system and the arm lifting
mechanism transfer workpieces to a
palette. The workpiece
positions on the palette can be set to
many points so that setup change
can be easily performed, even if the
palette position and the palette
shape change.
Schematic drawing
a
Lifter
Drive wheel
(on each of left
and right sides)
Travel head
Y direction
input Slide arm
Pallet
Arm vertical axis
(driven by air cylinder)
2 Positioning by AC Servo System
2.2 Examples of AC servo systems
Servo
amplifier
Regenerative
option
Servo
motor
Cart
Servo motor
to drive
slide arm
X direction
Workpiece
Servo motor
Conveyor
to drive
travel head