Lenze 8400 - Manual (Page 263)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
263
5 Motor control (MCTRL)
5.11 Encoder/feedback system
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5.11.4 Encoder with HTL level at DI1/DI2
Low speeds (except for edge counting)
For the first three methods (
C00496 = 0, 1, or 2), the minimum speed that can be measured depends
on the encoder resolution.
The quantisation error
• is independent of the encoder resolution,
• exclusively depends on the encoder quality (encoder errors).
• at least amounts to 0.5 rpm.
Internal arithmetic operations automatically maintain the minimally required value of the scanning
time in order to achieve maximum dynamics.

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 .
Encoder
resolution
(Number of
increments)
Min. measurable speed in [rpm]
8 16
16 8
32 4
64 2
128 1
256 0.5
≥ 512 0.25