Xinje DS5K Series, User Manual

Page: 58 / 194

cases, if the number of pulses per revolution is calculated as a decimal, the electronic gear ratio should
be considered.
(2) When P0-13 and P0-14 exceed the setting range, please divide the electronic gear ratio into
numerator and denominator. If the ratio still exceeds the parameter setting range, please use the second
gear ratio P0-92~P0-95. Only when P0-11~14 = 0, the second gear ratio takes effect.
(3) The resolution of DS5 series servo motor encoder is 131072 (17 bits) and 8388608 (23 bits).
(4) The command unit does not represent the machining accuracy. On the basis of the mechanical
accuracy, refining the instruction unit quantity can improve the positioning accuracy of the servo
system. For example, when using the lead screw, the mechanical accuracy can reach 0.01mm, so the
unit equivalent of 0.01mm is more accurate than the unit equivalent of 0.1mm.
3. Example of setting the electronic gear ratio
steps Name
Ball screw Round table Belt + pulley
1
Confirm
mechanical
specifications Ball screw pitch: 6mm
Machine deceleration ratio:
1:1 1-circle rotate angle:
360°
Deceleration ratio: 1:3 Pulley diameter: 100mm
Deceleration ratio: 1:2
2
Confirm the
number of
encoder pulses
Encoder resolution 131072 Encoder resolution
131072
Encoder resolution 131072
3
Confirm the
command unit
1 command unit: 0.001mm 1 command unit: 0.1° 1 command unit: 0.02mm
4
Calculate the
command
amount of 1
revolution of
load shaft 6mm/0.001mm=6000 360/0.1=3600 314mm/0.02mm=15700
5
Calculate the
pulse number
m
of one
revolution of
motor shaft
M =6000/(1/1)=6000 M=3600/(3/1)=1200 M=15700/(2/1)=7850
6
Set pulses per
rotation
P0-11/P0-12
P0-11=6000
P0-12=0 P0-11=1200
P0-12=0 P0-11=7850
P0-12=0
Set electronic
gear
ratio
(P0-13/P0-14)/
(P0-92~95)
P0-13=131072
P0-14=6000
After reduction
P0-13=8192
P0-14=375 P0-13=131072
P0-14=1200
After reduction
P0-13=8192
P0-14=75
P0-13=131072 P0-14=7850
After reduction
P0-13=65536 P0-14=3925
Conver to second gear ratio
P0-92=5536 P0-93=6
P0-94=3925 P0-95=0
Load shaft
D: pulley diameter
1rotate =
command unit
πD
Load
shaft
command unit
1 rotate =
360 °
P: pitch
P
1rotate =
command unit
P
Load shaft