Installation manual

Danaher Motion Kollmorgen 08/04 Wiring
SERVOSTAR S Installation M-SS-001-01 Rev. T 41
4.9.5.2. Cable Lengths
The recommended cable length when using the SERVOSTAR to
source the encoder is no longer than 50 ft. (15 m) Long encoder
cables tend to have high DC resistance that may create significant
loading affects in the supply lines to the encoder. Consider this
carefully when designing the system. An option that would allow the
use of longer lengths would be to put a separate supply at the
motor to source the encoder. Except for noise susceptibility, signals
returned to the drive are differentially connected which normally
does not constitute a problem with longer cable lengths.
4.9.5.3. Resolution and Accuracy
Internal resolution of the system can be derived through the
following calculation:
Encoder line resolution x 256 x 4 (quadrature).
System accuracy is largely dependent upon the accuracy of the
encoder itself. To get an approximate total value, the customer
need only look to the specifications listed for the encoder being
used.