TITLE
er
es
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AI contour control function
Specifications
EDIT. DATE DESIG. DESCRIPTION
FANUC LTD
SHEET
22/ 32
DRAW. NO.
A-63512EN
CUST.
1784 Feedrate when overtravel alarm has occurred during acceleration /
deceleration before interpolation
Data type : Word axis
Unit of data :
Valid range :
In this parameter, set the feedrate when an overtravel alarm occurs during the acceleration /
deceleration before interpolation.
When an overtravel alarm occurs during the acceleration / deceleration before interpolation,
the tool is overrun the amount of the deceleration distance because the deceleration stop is
done after an overtravel alarm occurs. The overrun distance changes depending on the
feedrate at an overtravel alarm. Therefore, the deceleration is start beforehand to reach the
feedrate set in the parameter No.1784 when an overtravel alarm occurs (when a limit is
reached) during the acceleration / deceleration before interpolation. And the overrun
distance that occurs at an overtravel alarm can be reduced. In this case, to decelerate so
that the feedrate set in parameter is greater than the feedrate at an overtravel, the
deceleration is occasionally completed early. The feedrate after the deceleration is
completed becomes the feedrate of the parameter setting value.
The deceleration is done at following conditions.
<
And the overrun distance is as follows.
overrun distance
≤
FIX
Fot
F
T
8
~
+
15
1875
2
.
×
F
T
F : Maximum machining speed during linear acceleration / deceleration before
interpolation. (Parameter No.1770)
T : Time constant during linear acceleration / deceleration before interpolation.
(Parameter No.1771)
Fot : Feedrate at overtravel alarm during linear acceleration / deceleration before
interpolation. (Parameter No.1784)
FIX : Round down below decimal point
Increment system Unit of data Valid range
IS-A, IS-B IS-C
Millimeter machine 1 mm/min 6 ~ 15000 6 ~ 12000
Inch machine 0.1 inch/min 6 ~ 6000 6 ~ 4800
distance to stored
stroke limit for each
axis
distance to decelerate from current feedrate
(feedrate in direction of tangent) to feedrate
of parameter setting