INVT SV-DA200 Series - Page 104

SV-DA200 series AC servo drive Function codes
-100-
P0.25
Numerator of 1
st
electronic gear ratio
Setting range
Default
Unit
Available mode
0–(2
31
-1)
0
-
P
P0.26
2
Denominator of the
electronic gear ratio
Setting range
Default
Unit
Available mode
1–(2
31
-1)
10000
-
P
P0.27
Numerator of 2
nd
electronic gear ratio
Setting range
Default
Unit
Available mode
0–(2
31
-1)
0
-
P
P0.28
Numerator of 3
rd
electronic gear ratio
Setting range
Default
Unit
Available mode
0–(2
31
-1)
0
-
P
P0.29
Numerator of 4
th
electronic gear ratio
Setting range
Default
Unit
Available mode
0–(2
31
-1)
0
-
P
Concept of the electronic gears: for any pulse input, the number and frequency of the pulse
actually received by the drive can be changed by multiplying a certain coefficient and this
coefficient is electronic gear ratio. It can be indicated in two parts: numerator and denominator:
Electronic gear ratio = g1/ g2;
Of which
g1: The numerator of the electronic gear ratio;
g2: The denominator of the electronic gear ratio;
Below is the schematic diagram of the electronic gear ratio in the system:
Deviation
counter
Motor
Encoder
Intermediate
link
Electrical gear
ratio
Input pulse train
Feedback pulse
Example: Below is a case where 1 pulse is
equivalent to a feed rate of 10μm
Mechanical specifications:
Feed of the ball screw Pb =10mm;
Reduction ratio n=3/5;
Resolution of the servo motor encoder =10000;
At this time calculate the electronic gear ratio:
3
00
1 10000 50
10 10
2 (3 5) 10 3
g Pt Pt
g S n Pb

  ·   ·   · 
  
In the formula :
0

: Feed rate corresponding to each pulse (mm/pulse);
S
: Feed rate corresponding to each rotation of the motor (mm/rot).
i.e. in this example, g1=50, g2=3.
Set P0.25 to 50 and P0.26 to 3.
The servo drive has 4 groups of electric gear ratio: P0.25, P0.26, P0.27 and P0.28, P0.29 can
󰳞󱬆󰴋
n
Servo
motor