3 htl encoder at di6/di7, Htl encoder at di6/di7, 6encoder/feedback system – Lenze 8400 TopLine User Manual
Page 357
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
357
6
Encoder/feedback system
6.4
Frequency HTL encoder (DI1/DI2, DI6/DI7)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
6.4.3
HTL encoder at DI6/DI7
Low speeds with edge counting
The speed measurement is evaluated at the digital terminals DI6/DI7 with the edge-counting
procedure and a fixed scanning time that can be set in
.
The minimum speed that can be measured and the quantisation error of speed measurement in the
edge-counting procedure depend on the scanning time that can be set in
and the
encoder resolution.
Depending on accuracy and the requirements with regard to the dynamic performance, the
respective scanning time must be selected and set in
:
Maximum speeds with edge counting
Due to the lower input frequency (max. 10 kHz) compared to the terminals DI1/DI2, operation with
maximum speed at the terminals DI6/DI7 is limited.
Note!
Single-track evaluation of the digital DI6/DI7 terminals as speed feedback (
= 1
or 3) is not possible. Hence, a single-track encoder cannot be used for speed control at
the digital DI6 terminal!
Encoder
resolution
(Number of
increments)
Scanning time [ms]
1
2
5
10
20
50
100
200
500
1000
Min. measurable speed in [rpm]
8
1875
938
375
188
93.8
37.5
18.8
9.4
3.8
1.9
16
938
469
188
94
46.9
18.8
9.4
4.7
1.9
0.9
32
469
234
94
46.9
23.4
9.4
4.7
2.3
0.9
0.5
64
234
117
46.9
23.4
11.7
4.7
2.3
1.2
0.5
0.2
128
117
58.6
23.4
11.7
5.9
2.3
1.2
0.6
0.2
0.12
256
58.6
29.3
11.7
5.9
2.9
1.2
0.6
0.3
0.12
0.06
512
29.3
14.6
5.9
2.9
1.5
0.6
0.3
0.15
0.06
0.03
1024
14.6
7.3
2.9
1.5
0.7
0.3
0.15
0.07
0.03
0.01
Encoder
resolution
(Number of
increments)
Max. measurable speed in [rpm]
8
No restrictions
16
37500
32
18750
64
9375
128
4688
256
2344
512
1172
1024
586