Siemens SINAMICS S120 Function Manual page 238

Extended Functions
Function module position control
p2502
Encoder 1
p2502 = 2,
Encoder 1
Fig. 4-19
The interrelationship between physical quantities and the neutral length unit LU is
realized, for rotary encoders, using parameter p2506 (LU per load revolution).
Parameter p2506 mirrors, together with p2504, p2505, the interrelationship
between encoder increments and the neutral position unit LU.
Example:
Rotary encoder, ball screw with a pitch of 10 mm/revolution. 10 mm should have a
resolution of 1 µm (i.e. 1 LU = 1 µm).
– > One load revolution corresponds to 10000 LU
– > p2506 = 10000
Note
The effective actual value resolution is obtained from the product of the encoder
pulses (p0408) and the fine resolution (p0418) and a measuring gearbox that is
possibly being used (p0402, p0432, p0433).
4-238
=
1, closed-loop position control with motor encoder
closed-loop position control with external encoder
Position actual value sensing using rotary encoders
p2505 load revolutions
p2506 LU per load revolution
p2504 motor revolutions
p2505 load revolutions
p2506 LU per load revolution
p2504 motor revolutions
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Encoder 2