YASKAWA SGMSV User Manual

8.3 Parameter Settings for Fully-closed Loop Control
8-21
8
Fully-closed Loop Control
8.3.5 Electronic Gear
Refer to 4.4.3 Electronic Gear for the purpose of setting the electronic gear.
The following formula is used to calculate the electronic gear ratio in fully-closed loop control.
Note: Set Pn20E (numerator B) and Pn210 (denominator A) to integral values.
The setting range is defined by 0.001 ≤ ≤ 4000.
The following table shows the various external encoder sin wave pitches and the number of divisions.
 External Encoder Sine Wave Pitch and Number of Divisions
The sine wave pitches and numbers of divisions for the external encoders are given in the following table.
Calculate the electronic gear ratio with the values in the following table.
∗1. If you use the encoder pulse output with these external encoders, the setting range of the encoder output resolution
(Pn281) is restricted. For details, refer to 8.3.3 Setting Encoder Output Pulses (PAO, PBO, and PCO).
∗2. Ask your Mitutoyo Corporation representative for details on this external encoder.
∗3. This is the model of rotational external encoder.
Refer to the manuals for the external encoder and serial converter unit for details on the sine wave pitch and
the number of divisions of the external encoder.
A
B
Pn210
Pn20E
External encoder sine wave pitch (value in the following table)
Travel distance per reference unit
×
Number of divisions (value in the following table)
Electronic gear ratio
===
B
A
Type of
External
Encoder
Manufacturer
External Encoder
Model
Sine
Wave
Pitch
[μm]
Model of Relay
Device between
SERVOPACK and
External Encoder
Num-
ber of
Divi-
sions
Resolu-
tion
Incremen-
tal
Heidenhain
LIDA48 20 JZDP-D003-000-E 256 0.078 μm
LIF48 4 JZDP-D003-000-E 256 0.016 μm
Renishaw plc RGH22B 20 JZDP-D005-000-E 256 0.078 μm
Magnescale Co., Ltd.
SR75-LF
*1
80 – 8192
0.0098
μm
SR75-MF 80 – 1024 0.078 μm
SR85-LF
*1
80 – 8192
0.0098
μm
SR85-MF 80 – 1024 0.078 μm
SL700
*1
, SL710
*1
,
SL720
*1
, SL730
*1
800 PL101-RY 8192
0.0977
μm
Absolute
Heidenhain LIC4100 20.48 EIB3391Y 4096 0.005 μm
Mitutoyo Corporation
ST781A/ST781AL 256 – 512 0.5 μm
ST782A/ST782AL 256 – 512 0.5 μm
ST783/ST783AL 51.2 – 512 0.1 μm
ST784/ST784AL 51.2 – 512 0.1 μm
ST788A/ST788AL 51.2 – 512 0.1 μm
ST789A/ST789AL
*2
25.6 – 512 0.05 μm
Magnescale Co., Ltd.
SR77-LF
*1
80 – 8192
0.0098
μm
SR77-MF 80 – 1024 0.078 μm
SR87-LF
*1
80 – 8192
0.0098
μm
SR87-MF 80 – 1024 0.078 μm
RU77-4096ADF
*3
– – 256 20 bits
RU77-4096AFFT01
*3
– – 1024 22 bits

YASKAWA SGMSV Specifications

General

Brand	YASKAWA
Model	SGMSV
Category	Servo Drives
Language	English