5 encoder with htl level at di5/di6, Encoder with htl level at di5/di6, 5motor control (mctrl) – Lenze 8400 User Manual

Page 265

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Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05

265

5

Motor control (MCTRL)

5.11

Encoder/feedback system

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

5.11.5

Encoder with HTL level at DI5/DI6

Low speeds with edge counting
The speed measurement is evaluated at the digital terminals DI5/DI6 with the edge-counting

procedure and a fixed scanning time that can be set in

C00425/2

.

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

C00425/2

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

C00425/2

:

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 DI5/DI6 is limited.

Digital terminals

( 303)

Note!

Single-track evaluation of the digital DI5/DI6 terminals as speed feedback (

C0115/2

= 1

or 3) is not possible. Hence, a single-track encoder cannot be used for speed control at

the digital DI5 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

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