3
05.01
3.2 Motor encoder
3-69
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
Encoder with TTL signal
For the speed control of induction motors with SIMODRIVE 611 universal
HRS control units, sin/cos 1 Vpp variant, TTL encoders can be connected
and evaluated.
The limit frequency f
G
can be as high as 420 kHz.
The SIMODRIVE 611 universal E HRS control unit allows only one TTL sig-
nal to be passed to a higher level controller using the PROFIBUS DP.
Note
The actually achievable system quality with regard to speed or positioning
accuracy depends primarily on the quality of the used encoders and other
influencing factors, such as:
the mechanical system (rigidity, backlash, mass (GD
2
)), and also
the control–engineering configuration of motors, power, controller
(interpolation and control cycles, control parameters, etc.)
In practice, the previously mentioned effects mean the quality that can be
achieved in a real system is significantly lower than the theoretically achievable
quality.
3 Motor Selection, Position/S
eed Sensin
05.08
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