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DATE
DESIG.
DESCRIPTION
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SHEET
TITLE
DRAW.NO.
FANUC Power Mate i-MODEL H
CONNECTION MANUAL (FUNCTION)
High Speed Skip function
B-63173EN-1/01-26
01
The following explanation is added after The following explanation is added after 14.2.2 14.2.2 Multi–step SkipMulti–step Skip
14.2.314.2.3
High-speed skipHigh-speed skip function function
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GeneralGeneral
The skip function can be performed by using a high-speed skip signal (DI30
~ DI37: connected directly to the CNC; not via the PMC) instead of an
ordinary skip signal (SKIP1 ~ SKIP4). In this case, up to eight signals can be
input. This high-speed skip signal input function allows high precision
measurement.
Acceleration / DecelerationAcceleration / Deceleration
and Servoand Servo DelayDelay
CompensationCompensation (Type A/B)(Type A/B)
According to this skip function, CNC can memorize the “current
position” of the axis at the moment when a skip signal is input. However,
the “current position” includes a delay in the servo system. In other
words, the “current position” deviates by the distance corresponding to
the servo delay from the actual tool position. This deviation can be
estimated from the following error in the servo system and the number of
remaining pulses caused by the acceleration/ deceleration. Taking this
deviation into account eliminates the necessity to include the servo delay
in a measurement error.
The deviation of the “current position” can be compensated for by either of
the following two types, using parameter SEA (bit 0 of parameter No.
6201) or parameter SEB (bit 1 of parameter No. 6201).
(1) Type A: The deviation is estimated from the cutting time constant
and the servo time constant (loop gain).
(2) Type B: The deviation is assumed to be a sum of the following error
and the number of remaining pulses caused by the acceleration/
deceleration when the skip signal is turned on.
Direction in which the axis moves
High–speed
skip signal
Position where
the axis actually
stopped
Position of the axis when
the skip signal was input
Q
Origin of the coordinate
system