YASKAWA SGD7S-120A, Technical Manual

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Linear encoder pitch
Linear encoder pitch
= Distance for one cycle of the analog voltage
feedback signal from the linear encoder
Fig. 132: Linear Encoder Pitch - Graphical Illustration
Setting examples are provided in this section.
Rotary Servomotors
Step Description Machine Configuration
Ball Screw Rotary Table Belt and Pulley
Reference unit: 0.001 mm
Load shaft
Encoder:
24 bits Ball screw lead:
6 mm
Reference unit: 0.01°
Load shaft
Encoder: 24 bits
Gear ratio:
1/100
Load shaft
Gear ratio
1/50
Reference unit: 0.005 mm
Pulley diameter:
100 mm
Encoder: 24 bits
1 Machine
Specifications
n
Ball screw lead:
6 mm
n
Gear ratio: 1/1
n
Rotation angle
per revolution:
360°
n Gear ratio:
1/100
n
Pulley dia.: 100
mm (Pulley cir-
cumference:
314 mm)
n
Gear ratio: 1/50
2 Encoder Res-
olution
16,777,216 (24
bits)
16,777,216 (24
bits)
16,777,216 (24
bits)
3 Reference
Unit
0.001 mm (1 μm) 0.01° 0.005 mm (5 μm)
4 Travel Dis-
tance per
Load Shaft
Revolution
(Reference
Units)
6 mm/0.001 mm =
6,000
360°/0.01° =
36,000
314 mm/0.005 mm
= 62,800
5 Electronic
Gear Ratio*
16,777,216
6,000
= ×
B
A
1
1
100
1
16,777,216
36,000
= ×
B
A
50
1
16,777,216
36,000
= ×
B
A
6 Position User
Unit (2301h)
Numerator:
16,777,216
Numerator:
1,677,721,600
Numerator:
838,860,800
Denominator:
6,000
Denominator:
36,000
Denominator:
62,800
Linear Servomotors
A setting example for a Serial Converter Unit resolution of 256 is given below.
Step Description Machine Configuration
Reference unit:
0.02 mm (20
m
m)
Forward direction
Electronic Gear Ratio Set-
ting Examples
Sigma-7 Series SERVOPACKs
Basic Functions That Require Setting before Operation
Setting Unit Systems > Setting the Position Reference Unit
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