Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 12 CONTROL SUB FUNCTIONS
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12.3.3
Near pass function
When continuous pass control is carried out using interpolation control, the near pass function is carried out.
The "near pass function" is a function to suppress the mechanical vibration occurring at the time of switching the
positioning data when continuous pass control is carried out using interpolation control.
[Near pass]
The extra movement amount occurring at the end of each positioning data unit being continuously executed is carried
over to the next positioning data unit. Alignment is not carried out, and thus the output speed drops are eliminated, and
the mechanical vibration occurring during speed changes can be suppressed.
Because alignment is not carried out, the operation is controlled on a path that passes near the position set in " Da.6
Positioning address/movement amount".
The details shown below explain about the "near pass function".
• Control details
• Control precautions
(1) Control details
The following drawing shows the path of the continuous path control by the 2-axis linear interpolation control.
[The path of the near pass]
Da. 6 Positioning address
Path of positioning data No. 4
V
t
Positioning data No. 3
Speed dropping does not occur.
Path of positioning data No.3
Positioning data No. 4