YASKAWA SVC - Page 351

5.1 Motion Parameters
5.1.5 Speed References
5-10
Example Settings for the OL  10 Setting Parameter
(Speed Reference Setting)
Given the following fixed parameter settings, the following table lists examples of the
OL
 10 settings that are required to achieve the target feed speed (reference speed).
• No. 5 (Number of Digits Below Decimal Point) = 3
• No. 34 (Rated Motor Speed) = 3,000 min
-1
• No. 36 (Number of Pulses per Motor Rotation) = 65,536 P/R
Example Settings for the OW  18 Setting Parameter
(Override)
The OW  18 setting parameter sets the speed as a percentage (output ratio) of the target
feed speed in 0.01% increments. OW
 18 is set independently of the Reference Unit Selec-
tion, Number of Digits Below Decimal Point, and other parameters.
Setting Example
If the output ratio is 25% … 25 ÷ 0.01 = 2,500
50% … 50 ÷ 0.01 = 5,000
75% … 75 ÷ 0.01 = 7,500
100% … 100 ÷ 0.01 = 10,000
OW03 Setting
Parameter (Speed
Unit Selection)
Fixed parame-
ter No. 4 (Ref-
erence Unit
Selection)
Reference Speed Example OL10 Setting
0
(Reference units/s)
pulse
500 R/s
500 (R/s) × 65,536 (pulse/R) = 37,268,000
(pulse/s)
1500 min
-1
1,500 (min
-1
) × 65,536 (pulse/R) ÷ 60 (s) =
1,638,400 (pulse/s)
mm
Feed speed of 500
mm/s with a
machine that trav-
els 10 mm for each
rotation
500 (mm/s) ÷ 0.001= 500,000 (0.001 mm/s)
The speed is determined by the feed speed and
the number of digits below the decimal point
(0.001 in the above equation), regardless of the
machine configuration.
Feed speed of 900
mm/min with a
machine that trav-
els 10 mm for each
rotation
900 (mm/min) ÷ 0.001 ÷ 60 (s) =
15,000 (0.001 mm/s)
The speed is determined by the feed speed and
the number of digits below the decimal point
(0.001 in the above equation), regardless of the
machine configuration.
1
(10
n
reference units/
min)
n: Number of digits
below the decimal
point
pulse
500 R/s
(500 (R/s) × 65536 (pulse/R) ÷ 1,000) × 60 (s) =
1966080 (1,000 pulse/min)
1,000 = 10
n
(n = 3)
1500 min
-1
1,500 (min
-1
) × 65,536 (pulse/R) ÷ 1,000 =
98,304 (1,000 pulse/min)
1,000 = 10
n
(n = 3)
mm
(n = 3)
Feed speed of 500
mm/s with a
machine that trav-
els 10 mm for each
rotation
(500 (mm/s) ÷ 0.001) ÷ 1,000 × 60 (s) = 30,000
(mm/min)
The speed is determined by the feed speed and
the number of digits below the decimal point
(0.001 in the above equation), regardless of the
machine configuration.
Feed speed of 900
mm/min with a
machine that trav-
els 10 mm for each
rotation
(900 (mm/min) ÷ 0.001) ÷ 1,000 = 900 (mm/
min)
The speed is determined by the feed speed,
regardless of the machine configuration.
2
(0.01%)
–
1500 min
-1
(1,500 (min
-1
) ÷ 3,000 (min
-1
)) × 100 (%) ÷ 0.01
= 5,000 (0.01%)
The speed is determined by the ratio (percent-
age) of the feed speed to the rated speed.