Chapter 6 Commissioning Instructions
For an incremental encoder, encoder resolution = encoder lines * 4, for example, the resolution of a 2500-line
incremental encoder is 2500*4=10000.
b. Electronic gear ratio switching setting
When P05.05 is 0, the electronic gear ratio switching function can be used. It should be determined whether it is
necessary to switch among 4 sets of electronic gear ratios according to the mechanical operation, and the
electronic gear ratio switching conditions should be set. There is one and only one set of electronic gear ratios
active at any one time.
Associated function code
Electronic
gear ratio
switching
conditions
0: Position command is 0,
switch after 3ms duration
1: Real-time switching
Set electronic
gear ratio
switching
conditions
At the same time, please configure the 2 DI terminals of the servo drive as functions 15 and 16 (FunIN.15 and
FunIN.16), and determine the valid logic of the DI terminals. Refer to the table below for electronic gear ratio
selection. When no DI is configured as FunIN.15 or FunIN.16, FunIN.15 and FunIN.16 are invalid by default.
Electronic gear ratio B/A
Encoder resolution/P05.05
3) Calculation method of electronic gear ratio:
When the machine reduction ratio between the motor shaft and the load side is m/n (when the motor rotates m
circle, the load shaft rotates n circle), the set value of the electronic gear ratio can be obtained by the following
formula.
Electronic gear ratio
B
A
=
Encoderresolution
thedisplacementforloadshaftrotateacircle (commandunit)
×
m
n
a. Confirm the mechanical parameters and servo motor encoder resolution
Confirm mechanical parameters, such as reduction ratio, ball screw lead, belt transmission ratio, confirm the
servo motor encoder resolution.
b. Confirm the positioning accuracy (i.e. pulse equivalent)
Pulse equivalent refers to the load minimum movement unit corresponding to each pulse command signal. Pulse
equivalent can be 0.001mm, 0.1 °, 0.01 inches, a pulse is entered, moving a pulse equivalent of the distance or
angle.
For example, pulse equivalent is 0.001mm, when the input command pulse is 50000, the amount of the load
movement is (50000 * 0.001mm) = 50mm.
c. Calculate the number of position command required by load shaft rotate a circle
Use mechanical parameters, pulse equivalent, calculate the number of position command required by load shaft
rotate a circle.
For example, the ball screw pitch is 5mm, pulse equivalent is 0.001mm, then:
The displacement for load shaft rotate a circle (command bits) = 5mm / 0.001mm = 5000
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