Fixed-Feed Control - Mitsubishi Electric RD77MS2 User Manual

Fixed-feed control

In "fixed-feed control" ("[Da.2] Control method" = fixed-feed 1, fixed-feed 2, fixed-feed 3, fixed-feed 4), the motor of the
specified axis is used to carry out fixed-feed control in a set axis direction.
In fixed-feed control, any remainder of below control accuracy is rounded down to convert the movement amount designated
in the positioning data into the command value to servo amplifier.
Operation chart
In fixed-feed control, the address ([Md.20] Current feed value) of the current stop position (start point address) is set to "0".
Positioning is then carried out to a position at the end of the movement amount set in "[Da.6] Positioning address/movement
amount". The movement direction is determined by the movement amount sign.
• Positive movement amount: Positioning control to forward direction (Address increase direction)
• Negative movement amount: Positioning control to reverse direction (Address decrease direction)
Ex.
1-axis fixed-feed control
0 0
Designated
Positioning
movement
start
amount
Reverse direction
Movement direction for a
negative movement amount
Ex.
2-axis fixed-feed control
Y axis
"[Md.20] Current feed value" of each axis
is set to "0" at the positioning start
Designated
movement amount
(0,0)
movement amount
0 0
Stop position
Movement direction for a
positive movement amount
(0,0)
(0,0)
Designated
"[Md.20] Current feed value"
is set to "0" at the positioning start
0
Forward direction
X axis
3 MAJOR POSITIONING CONTROL
3.2 Setting the Positioning Data
3
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