YASKAWA SVC - Speed References

5.1 Motion Parameters
5.1.5 Speed References
5-9
5
Machine-Specic Motion Control
5.1.5 Speed References
There are two methods of setting the speed reference for the feed speed or other speeds. One
method involves using reference units and the other method involves setting the percentage
(%) of the rated speed. The setting method depends on the settings of the related parameters.
The parameters that are related to the speed reference are listed in the following table.
Parameter
Typ e
Parameter/
Register
Address
Name Description Default
Fixed
Parameters
No.5
Number of
Digits Below
Decimal Point
This parameter sets the number of digits below the
decimal point in the reference unit. The minimum
reference unit is determined by this parameter and
fixed parameter No. 4 (Reference Unit Selection).
Example:
When the Reference Unit Selection parameter is
set to mm and the Number of Digits Below Decimal
Point parameter is set to 3, a reference unit of 1 will
be 0.001 mm.
3
No.34
Rated Motor
Speed
This parameter sets the number of rotations when
the motor is rotated at the rated speed (100%
speed). Set this parameter according to the specifi-
cations of the motor.
3,000
No.36
Number of
Pulses Per
Motor Rotation
This parameter sets the number of pulses per Ser-
vomotor rotation.
Example:
For a 16-bit encoder, set this parameter to 2
16
=
65,536.
65,536
Setting
Parameters
OW
03
Bit 0 to 3
Speed Unit
Selection
This parameter sets the unit for the reference
speed.
0: Reference units/s
1: 10
n
reference units/min (n: Number of digits
below the decimal point)
2: 0.01%
3: 0.0001%
1
OL
10
Speed Refer-
ence Setting
This parameter sets the feed speed. The unit for
the speed is set in bits 0 to 3 (Speed Unit Selec-
tion) of OW
03.
Example:
When the number of digits below the decimal point
is set to 3, the settings are as follows:
• When the Speed Unit Selection Is Set to 0 (Refer-
ence Unit/s):
Pulse unit: 1 = 1 pulse/s
mm unit: 1 = 0.001 mm/s
Degree unit: 1 = 0.001 deg/s
Inch unit: 1 = 0.001 inches/s
μm unit: 1= 0.001 μm/s
• When the Speed Unit Selection Is Set to 1 (10
n
reference unit/min):
Pulse unit: 1 = 1,000 pulses/min
mm unit: 1 = 1 mm/min
Degree unit: 1 = 1 deg/min
Inch unit: 1 = 1 inch/min
μm unit: 1 = 1 μm/s
• When the Speed Unit Selection Is Set to 2
(0.01%):
Set a percentage of the rated motor speed (1 =
0.01%), regardless of the reference unit.
3,000
OW
18 Override
You can set an output ratio (%) for the setting of
this parameter to change the feed speed without
changing the Speed Reference Setting.
Setting unit: 1 = 0.01%
10,000