Mitsubishi Electronics QD75D, QD75P [2] Precautions during control

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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] Precautions during control
(1) If the movement amount designated by the posi tioning data is small when
the continuous path control is executed, the ou tput speed may not reach the
designated speed.
(2) If continuous path control is carried out, t he output will suddenly reverse
when the reference axis movement direction c hanges from the positioning
data No. currently being executed to the next positioning data No.
If the sudden output reversal affects the mecha nical system, carry out
control with continuous positioning control.
[Path during continuous path control]
Axis 2
Axis 1 (reference axis)
Positioning data No.2
Positioning data No.1
[Axis 1 output speed]
V
t
Output suddenly reverses.
Positioning data
No. 1
Positioning data No.2
[Axis 2 output speed]
V
t
Positioning data No.2
Positioning data
No. 1
Fig. 12.11 Path and output speed of various axes when movement direction varies during co ntinuous
path control