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MITSUBISHI CNC
III Functional Specifications
13.1.3 Memory-type Relative Position Error Compensation
M720VW
M system
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L system
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Machine accuracy can be improved by compensating a relative error between machine axes, such as a
production error or time aging.
The compensation base axis and compensation execution axis are set by using parameters.
The compensation points are divided at any desired equal intervals.
1. Compensation point dividing intervals : 1 to 9999999 (μm)
2. Number of compensation points : 1024
3. Compensation amount : -128 to 127 (output unit)
4. Number of compensation axes : 10 axes (including number of axes for pitch error compensation.)
(1) The compensation position is set for the compensation axis whose reference position serves as the
zero (0) point. Thus, memory-type relative position error compensation is not performed upon the
axis for which return to reference position is not made after the controller power is turned ON and
the servo is turned ON.
(2) When the compensation base axis is a rotary axis, select the dividing intervals so that one rotation
can be divided.
(3) Since all coordinate systems of compensation execution axes are shifted or displaced by the
compensation amount when the relative position error compensation is made, the stroke check
point and machine coordinate system are also shifted or displaced.
(Note 1) Compensation points 1,024 is a total including the points for memory-type pitch error
compensation.
(Note 2) A scale of 0 to 99-fold is applied on the compensation amount.
III - 290
M730VW
M750VW
M720VS
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M730VS
M750VS
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