Mitsubishi MELSEC-F, Training Manual

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Positioning Control Positioning by AC Servo System 2
2-4
Index table
The position of the circular table is
indexed.
The index position is set on the outside
(digital switch) or the inside (program).
Shortcut drive is performed depending on
the index position.
Lifter moving-up/down
As negative load is applied on the servo
motor in positioning of the lifter in the
vertical direction, a regenerative option is
used also.
In order to hold the lifter stationery and
prevent drop of the lifter by power
interruption, a servo motor with
electromagnetic brake is used.
Cart travel control
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.
Carrier robot
After the conveyor stops, the 2-axis servo
system and the arm lifting mechanism
transfer workpieces to a palette.
The workpiece input 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.