Lenze 8400 TopLine - Manual (Page 333)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
333
6 Encoder/feedback system
6.3 Multi-Encoder (X8)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
6.3.2.3 Display of the current position
In C01119/1 , the current actual position of the motor shaft is displayed in [units]. It is calculated
from the actual value of the encoder selected in C00422 :
[6-2] Actual position calculation
As the term "revolution" does not make any sense in case of linear encoders, the distance covered is
defined as the path in which the increments or SinCos periods parameterised in C00420/3 are
completely run through once. In of rotative encoders, this corresponds to exactly one encoder
revolution.
Internal conversion of the encoder information on the motor shaft position
In the controller, the information of the Hiperface track are factorised so that a revolution of the
encoder corresponds to 65536 increments which means a passage of the increments or SinCos
periods parameterised in C00420/3 . The same applies to linear encoders.
The factor is automatically calculated from the encoder data ( C00494/1..2 ) that have either been
saved in the device or manually configured.
Example: 4096 Hiperface increments per revolution  Factor = 65536/4096 = 16
In case of linear encoders, a conversion to one revolution of the motor or gearbox output shaft is
made, too. This conversion is made considering the traversing path set in C01111/3 which is
covered during a passage of the increments and sin/cos periods parameterised in C00420/3 :
[6-3] Conversion to one revolution of the motor or gearbox output shaft in case of linear encoders
Related topics:
 Scaling of position value
Pos = encoder position in increments
• For rotative encoders, the following applies: 65536 increments = 1 revolution
• For linear encoders, the following applies: 65536 increment = 1 increment path
C01119/1 Pos C01204 C01202/2
C01202/1
------------------------- C01203/1
C01203/2
------------------------- ⋅ ⋅ ⋅
 
  C01112/1
+ =
Pos
Mot
Pos
lin
C01111/3
C01204
------------------------- ⋅
=