
B-63783EN-1/01 9.SPINDLE FUNCTION
- 927 -
5804 Allowable range for constant spindle speed signal output in exponential
acceleration/deceleration
[Input type] Parameter input
[Data type] Integerspindle
[Unit of data] detection unit
[Valid data range] 0 - 99999999
The constant spindle speed signal is output when the difference in the number of
remaining pulses held in the acceleration/deceleration circuit between two adjacent
distribution periods (ITPs) is zero. In exponential acceleration/deceleration,
however, the difference in the number of remaining pulses between two adjacent
ITPs does not become zero even when a constant speed is kept. In this case, a
constant speed is assumed to be reached when the difference in the number of
remaining pulses is within the range specified in this parameter.
In the figure shown below, the number of pulses accummulated in the
acceleration/deceleration circuit at ITP6 is:
α1+α2+α3+α4+α5+α6
At ITP7, the number of accummulated pulses is:
α1+α2+α3+α4+α5+α6+α7
Therefore, the difference in pulses accummulated in the acceleration/deceleration
circuit at ITP6 and ITP7 is α7.
The difference will not become 0 indefinitely.
ITP1
ITP1ITP1
ITP1
Actual
Actual Actual
Actual feedrate
feedratefeedrate
feedrate
Time
TimeTime
Time
Feedrate
FeedrateFeedrate
Feedrate
specified in F
specified in Fspecified in F
specified in F
ITP2
ITP2ITP2
ITP2 ITP3
ITP3ITP3
ITP3 ITP4
ITP4ITP4
ITP4 ITP5
ITP5ITP5
ITP5 ITP6
ITP6ITP6
ITP6 ITP7
ITP7ITP7
ITP7
t
tt
t
p1
p1p1
p1
p2
p2p2
p2
p3
p3p3
p3
p4
p4p4
p4
p5
p5p5
p5
p6
p6p6
p6
p7
p7p7
p7
α1
α1α1
α1
α2
α2α2
α2
α3
α3α3
α3
α4
α4α4
α4
α5
α5α5
α5
α6
α6α6
α6
α7
α7α7
α7
pn
pnpn
pn: Number of output pulses in one
: Number of output pulses in one : Number of output pulses in one
: Number of output pulses in one ITP
ITPITP
ITP
α
αα
αn
nn
n: Number of pulses accumulated in the acceleration/deceleration circuit in one
: Number of pulses accumulated in the acceleration/deceleration circuit in one : Number of pulses accumulated in the acceleration/deceleration circuit in one
: Number of pulses accumulated in the acceleration/deceleration circuit in one ITP
ITPITP
ITP