Mitsubishi A1SD75M1, User Manual

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12 - 15
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.3.2 Electronic gear function
The "electronic gear function" adjusts the position and speed commands calculated
and output according to the parameters set in the AD75 with the actual machine
movement amount.
The "electronic gear function" has the following four functions.
(A) During machine movement, the function increments in the AD75 values less
than one pulse that could not be position command output, and outputs the
incremented amount of position commands when the total incremented value
reached one pulse or more.
(B) The accumulated value not reaching one pulse is reset to zero when sizing
feed control is started. (Even if sizing feed control continues, the same
machine movement amount is always used for the control.)
(C) When the current value is changed, the accumulated value not reaching one
pulse is reset to zero.
(D) The function compensates the mechanical system error of the command
movement amount and actual movement amount by adjusting the "movement
amount per pulse".
(The "movement amount per pulse" value is defined by " Pr.2 No. of pulses
per rotation (Ap)", " Pr.3 Movement amount per rotation (Al)", and " Pr.4
Unit magnification (Am)".)
The AD75 automatically carries out the processing for (A), (B) and (C).
The details shown below explain about the "electronic gear function", including the
method for compensating the error in (D) above, etc.
(1) Error compensation method
(2) Relation between the movement amount per pulse and speed
(3) Precautions during control