Lenze 8400 StateLine - Manual (Page 224)

5 Motor control (MCTRL)
5.10 Encoder/feedback system
224
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
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5.10.3 HTL encoder at DI1/DI2
Encoder evaluation method DigIn12
Depending on the encoder used at the digital terminals DI1 and DI2, the following table specifies
which evaluation method should be selected in C00496 :

Tip!
We recommend the use of the preset procedure for low-resolution encoders (
C00496 = 1).
This procedure can also be used for dynamic applications (e.g. V/f + encoder).

Note!
At the digital terminals DI1 and DI2, only encoders with HTL level can be used.
In spite of the selected operating mode without encoder feedback, the actual speed
value ( C00051 ) is calculated if an encoder is connected and "1: Encoder signal FrqIn12" is
selected in C00495 .
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 scanning time setting
(0.5 … 500 ms) for low-resolution encoders in the range of 4 …. 128 increments.
• Evaluation with automatic scanning 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.