Veichi SD780 Series, Руководство пользователя, Страница: 105 / 284

5 Operation
99 SD780 Series Servo Technical Manual
the setting value should not exceed 4Mpps. If the upper limit value is exceeded, A.511 (frequency
division pulse output over speed alarm) will be output.
5.8.7 Setting of Electronic Gear
The setting range of the electronic gear ratio is as follows:
0.001 ≤ electronic gear ratio (B/A) ≤ 16778.
When the setting range is exceeded, ER.040 (parameter setting abnormal alarm) will occur.
Function
code
Parameter Range Default Unit
Communication
address
When
enabled
Pn204
Electronic gear
ratio
(molecular)
0
～
1073741824 64 1 0x006/0x207
After
restart
Pn206
Electronic gear
ratio
(denominator)
0
～
1073741824 1 1 0x008/0x09
After
restart
Calculation method of electronic gear ratio setting value
◆
Semi closed-loop control
When the machine deceleration ratio of motor shaft and load side is n / M (when the motor rotates
m turns, the load shaft rotates n turns), the setting value of electronic gear ratio can be obtained
as following formula.
Electric gear ratio
𝐵
𝐴
=
𝑃𝑛204
𝑃𝑛206
=
Number of encoder lines
Movement of load shaft 1 revolution (Command unit)
×
𝑚
𝑛
= Movement corresponded with input command 1 pulse
Movement corresponded with grating ruler output 1 pulse
Encoder resolution
The encoder resolution can be confirmed by the servo motor model. The suffix D1 or D2 is 23
bit encoder, the suffix is Q1, Q2, R1, R2 is 17 bit encoder, the suffix is E1, E2 is 24 bit encoder.
◆
Full closed-loop control
Electric gear ratio
When setting value is “4000”, and speed is 1600mm/s,
1600𝑚𝑚/𝑠
0.001𝑚𝑚
= 1600000 = 4Mpps,
1.6Mpps
＜
4Mpps, so it can use this setting value.