Lenze E94AYCCA Instructions De Montage page 42

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6 Electrical installation
Wiring the CAN bus
Check repeater application
Given:
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Baud rate:
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Cable cross−section:
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Number of nodes:
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Cable length:
Test sequence
1. Total cable length at 125 kbit/s:
2. Segment cable length for 28 nodes and a cable cross−section
2
of 0.5 mm :
3. Comparison: The value under point 2 is smaller than the required cable length of 450 m.
Conclusion
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It is not possible to use a cable length of 450 m without installing a repeater.
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After 360 m (point 2) a repeater must be installed.
Result
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The Lenze repeater, type 2176 (cable reduction: 30 m), is used.
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Calculation of the max. cable length:
First segment: 360 m
Second segment: 360 m (according to Tab. 1) minus 30 m (cable reduction when a repeater is
used)
à Max. possible cable length with repeater: 690 m.
à Now the required cable length is possible.
)
Note!
The use of a further repeater is recommended as a
Service interface
ƒ
Advantage: Trouble−free connecting during ongoing bus operation is
possible.
Calibration interface
ƒ
Advantage: Calibration/programming unit remains electrically isolated.
42
125 kbit/s
2
0.5 mm
28
450 m
l
Cable length See
630 m Tab. 1
360 m Tab. 2
EDK94AYCCA DE/EN/FR/ES/IT 3.0