YASKAWA SVC User Manual page 374

 Fixed Parameter Settings Required for an Absolute Encoder System
The following table lists the fixed parameters that must be set to perform infinite-length opera-
tion using simple absolute infinite axis position management.
No. Name
4 Reference Unit Selection
30 Encoder Selection
Travel Distance per Machine
6
Rotation
8 Servomotor Gear Ratio Term
9 Machine Gear Ratio Term
Infinite-length Axis Reset
10
Position (POSMAX)
Number of Pulses Per Motor
36
Rotation
Maximum Number of Absolute
38
Encoder Rotations
*1.
Electronic gear settings are invalid when the pulse is selected as the reference unit.
*2.
N is the number of encoder bits.
• Fixed Parameter Setting Example
The following table gives a fixed parameter setting example for infinite-length operation using
simple absolute infinite axis position management.
No. Name
4 Reference Unit Selection
30 Encoder Selection
6 Travel Distance per Machine Rotation
8 Servomotor Gear Ratio Term
9 Machine Gear Ratio Term
Infinite-length Axis Reset Position (POS-
10
MAX)
36 Number of Pulses Per Motor Rotation
Maximum Number of Absolute Encoder
38
Rotations
Reset number of turns = (360,000 × 6)/(360,000 × 5) = 6/5
Formula for determining if simple infinite axis position management can be used: (59,705 + 1)/
(6/5) = 49,755
Because the above formula results in an integer with a remainder of 0, simple absolute infinite-
length position management can be used.
5.2.6 Position Management Method for Each Machine Operation Type
Setting
Setting
Unit
*1
0: pulse
1: mm
–
2: deg
3: inch
4: μm
1: Absolute encoder –
Refer-
− 1
31
ence
1 to 2
units
Rota-
1 to 65,535
tions
Rota-
1 to 65,535
tions
Refer-
− 1
31
ence
1 to 2
units
N *2
pulse
2
Rota-
− 1
31
0 to 2
tions
Setting
2
1
360000
6
5
360000
16384
59705
5.2 Absolute Encoders
Reference

Reference Unit Selection on
page 3-31

Encoder Selection on page 3-
33
–
–
–
–

Number of Pulses Per Motor
Rotation on page 5-34

Maximum Number of Abso-
lute Encoder Rotations on page
3-35
Unit
deg
Absolute encoder
Reference unit = Degrees
Rotations
Rotations
Reference unit = Degrees
pulse
Rotations
5
5-33