8400 StateLine C | Reference manual
Motor control (MCTRL)
Encoder/feedback system
220 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.10.2 Encoder evaluation method
Depending on the encoder used, the following table specifies which evaluation method
should be selected in C00496
:
Tip!
We recommend to use the preset procedure for low-resolution encoders
(C00496
= 1). This procedure can also be used for dynamic applications (e.g. V/f +
encoder).
Selection in C00496 Encoder evaluation method
1: Low-resolution encoder
(Lenze setting)
High-precision procedure for low-resolution encoders (<=128 increments)
• Exact method for speed measurement with automatic scan time setting
(0.5 … 500 ms) for low-resolution encoders in the range of 4 …. 128 increments.
• Evaluation with automatic scan time minimisation for an optimum dynamic
performance.
• Method is also suited for encoders with poor signal quality, e.g. for encoders with
high error rate in scanning ratio and phase offset.
• This method requires an equidistant period length per encoder increment.
• Wiring according to EMC (e.g. motor and encoder cable shielding) is required!
3: Edge-counting procedure Simple edge counting procedure with adjustable scanning time (C00425)
• Speed measurement by means of the edges of tracks A and B measured per
scanning interval.
• Integrated correction algorithm for EMC interference.
• Limited suitability for systems with unshielded encoder and/or motor cable.
• Limited suitability for encoders with poor signal quality, i.e. high error rate in
scanning ratio and phase offset.
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