Siemens SINAMICS V90 Operating Instructions Manual page 173

Calculation formula for the electronic gear ratio
Examples for calculating the electronic gear ratio
Step Description
1 Identify mechanism
2 Identify the encoder
resolution
3 Define LU
4 Calculate the travel
distance per load shaft
revolution
5 Calculate the electronic
gear ratio
6 Set param- p29012/p
eters 29013
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002
Ball screw
Pitch of ball screw: 6 mm
•
Deduction gear ratio: 1:1
•
10000
1 LU = 1 μm
6/0.001 = 6000 LU
(1/6000) / (1/1) × 10000 = 10000/6000
= 10000/6000 = 5/3
7.3 Pulse train input position control (PTI)
Mechanism
Disc table
Rotary angle: 360
•
Deduction gear ratio: 1:3
•
10000
1 LU = 0.01
o
360 /0.01 = 36000 LU
o o
(1/36000) / (1/3) × 10000 = 10000/12000
= 10000/12000 = 5/6
Control functions
o
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