Siemens SINAMICS S200 - Page 255

Example
Calculation formula for the electronic gear ratio
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Table 9-16 Examples for calculating the electronic gear ratio
Step

Description Mechanism
Ball screw Disc table
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1 Identify mechanism
• Pitch of ball screw: 8mm
• Reduction gear ratio: 1:1
• Ro
tary angle: 360°
• Reduction gear ratio: 3:1
2 Identify the encoder resolu‐
tion (r)
21-bit 21-bit
3 De󹪝ne L
U 1LU = 1μm 1L
U = 0.01°
4 Calculate the travel distance
per load shaft revolution
8/0.001 = 8000L
U 360°/0.01° = 36000LU
5 Calculate the electronic gear
ratio
(1/8000)/(1/1) × 2
21
= 2
21
/8000 =
32768/125
(1/36000)/(3/1) × 2
21
= 2
21
/12000
131072/75
Parameters
The following list includes the par
ameters of the "Electronic gear ratio" function.
Number Name Unit
Functions
9.5Fast position control with pulse train input (Fast PTI)
SINAMICS S200 pulse train servo drive system with SIMOTICS S-1FL2
Operating Instructions, 11/2023, FW V6.3, A5E51646767B AA 253