Speed References - YASKAWA SVC User Manual

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
Type
Fixed
Parameters
Setting
Parameters
Parameter/
Register Name
Address
Number of
No.5 Digits Below
Decimal Point
Rated Motor
No.34
Speed
Number of
No.36 Pulses Per
Motor Rotation

OW 03 Speed Unit
Bit 0 to 3 Selection
Speed Refer-

OL 10
ence Setting

OW 18 Override
Description
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.
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.
This parameter sets the number of pulses per Ser-
vomotor rotation.
Example:
For a 16-bit encoder, set this parameter to 2
65,536.
This parameter sets the unit for the reference
speed.
0: Reference units/s
n
1: 10 reference units/min (n: Number of digits
below the decimal point)
2: 0.01%
3: 0.0001%
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
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.
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%
5.1 Motion Parameters

5.1.5 Speed References

Default
3
3,000
65,536
16
=
1
3,000
n
10,000
5-9
5