Siemens SINAMICS S120 Function Manual page 239

p2502 = 1, closed-loop position control with linear motor encoder
p2502 = 2, closed-loop position control with external encoder
Encoder 1
Fig. 4-20
For linear encoders, the interrelationship between the physical quantity and the
neutral length unit LU is configured using parameter p2503 (LU/10 mm).
Example:
Linear scale, 10 mm should have a resolution of 1 µm (i.e. 1 LU = 1 µm)
– > p2503 = 10000
LU
_
Act val
p
2512
Fig. 4-21
A correction can be made using connector input p2513 (correction value, position
actual value conditioning) and a positive edge at binector input p2512 (activates
the correction value). When the function module "basic positioning" is activated,
p2513 is automatically interconnected with r2685 (EPOS correction value) and
p2512 with r2684.7 (activate correction). This interconnection implements the
modulo correction of EPOS.
A position offset can be switched-in using p2516. Using EPOS, p1216 is automa-
tically interconnected to r2667. Backlash compensation is implemented using this
interconnection.
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
2503 LU per 10 mm
p2505 load revolutions
p2504 motor revolutions
Position actual value sensing with linear encoders
+
+
cond corr act
(0) s_
act setting Setting value
0 1 p
2515
0
_ s_
Act val cond corr act setting act
p p
2513 2514
(0)
Position actual value conditioning
Function module position control
p2506 spindle pitch
p2503 LU per 10 mm
(0)
Position offset
p
2516
(0)
Extended Functions
Encoder 1
Encoder 2
Position actual
value(s_act)
+
+
(0)
4-239