5.14 Electronic Gear Settings
5.14.2 Electronic Gear Ratio Setting Examples
5-45
5
Basic Functions That Requir
e Setting befor
e Operation
*1.
These are reference values for setting SERVOPACK parameters. Contact the manufacturer for actual linear
encoder scale pitches.
*2.
This is the model of the Serial Converter Unit.
*3.
This is the model of the Head with Interpolator.
*4.
This is the model of the Interpolator.
*5.
If you use an encoder pulse output with this linear encoder, the setting range of the encoder output resolution
(Pn281) is restricted. Refer to the following section for details on the encoder output resolution (Pn281).
6.5.2 Setting for the Encoder Divided Pulse Output
5.14.2
Electronic Gear Ratio Setting Examples
Setting examples are provided in this section.
•
Rotary Servomotors
Resolution
You can calculate the resolution that is used inside the SERVOPACK (i.e., the travel distance per
feedback pulse) with the following formula.
The SERVOPACK uses feedback pulses as the unit to control a Servomotor.
Information
Resolution (travel distance per feedback pulse) =
Linear encoder pitch
Resolution of Serial Converter Unit or linear encoder
Linear encoder pitch
Linear encoder pitch
=Distance for one cycle of the analog voltage
feedback signal from the linear encoder
Step
Description
Machine Configuration
Ball Screw
Rotary Table
Belt and Pulley
1
Machine
Specifications
•
Ball screw lead: 6 mm
•
Gear ratio: 1/1
•
Rotation angle per revo-
lution: 360
°
•
Gear ratio: 1/100
•
Pulley dia.: 100 mm
(Pulley circumference:
314 mm)
•
Gear ratio: 1/50
2
Encoder Resolution
16,777,216 (24 bits)
16,777,216 (24 bits)
16,777,216 (24 bits)
3
Reference Unit
0.001 mm (1
μ
m)
0.01
°
0.005 mm (5
μ
m)
4
Travel Distance 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
6
Parameters
Pn20E: 16,777,216
Pn20E: 167,772,160
Pn20E: 838,860,800
Pn210: 6,000
Pn210: 3,600
Pn210: 62,800
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
Reference unit: 0.005 mm
Load shaft
Gear ratio:
1/50
Pulley dia.:
100 mm
Encoder: 24 bits
16,777,216
6,000
1
1
=
×
B
A
B
A
16,777,216
36,000
100
1
=
×
B
A
16,777,216
62,800
50
1
=
×