
B-64120EN/01 4.DESCRIPTION OF PARAMETERS
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NOTE
1 When 0 is set in parameter No.1770 or parameter
No.1771, linear acceleration/deceleration before
interpolation is disabled.
2 In parameter Nos. 1770 and 1771, set values that
satisfy the following:
Parameter No.1770/Parameter No.1771 ≥ 5
3 If 0 is set in parameter No. 1770 or 1771 in AI
advanced preview control or AI contour control, P/S
alarm 5157 is issued.
1772
Time constant for bell-shaped acceleration/deceleration of acceleration time
fixed type before look-ahead interpolation
[Data type] Byte
[Unit of data] msec
[Valid data range] 0 to 255
This parameter is used to set a time constant when the BEL parameter
(bit 7 of parameter No.1603) is set to 1, that is, when bell-shaped
acceleration/deceleration before look-ahead interpolation is selected in
AI contour control mode. Set the value of tb as shown below. When 0
is set, linear acceleration/deceleration before interpolation is applied.
Feedrate
Linear
acceleration/deceleration
Time
ta: Depends on linear acceleration.
tb: Bell-shaped time constant
tc: Bell-shaped
acceleration/deceleration
tc=ta+tb
tb
tb tb tb
ta ta
tc tc
Bell-shaped
acceleration/deceleration
NOTE
The option for bell-shaped
acceleration/deceleration before look-ahead
interpolation is required. This parameter is enabled
only in AI contour control mode.