Lenze E82ZAFCC100 - Manual (Page 56)

6 Electrical installation
Bus cable length
EDK82ZAFCC-100 DE/EN/FR 5.0
56
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H2 BusLeitgsLaenge-Leitungslaenge_3
Check repeater application
Given:
Baud rate: 125 kbps
Cable cross-section: 0.5 mm 2
Number of nodes: 28
Cable length: 450 m
Procedure Cable length See
1. Total cable length at 125 kbps: 610 m from Tab. 1
2. Segment cable length for 28 bus nodes and a cable
cross-section of 0.5 mm 2 :
360 m from Tab. 2
3. Comparison: The value under 2. is smaller than the cable length of 450 m.
Conclusion
It is not possible to use a cable length of 450 m without using a repeater.
After 360 m (item 2.), a repeater must be installed.
Result
The Lenze repeater type 2176 is used (cable reduction: 30 m)
Calculation of the maximum cable length:
First segment: 360 m
Second segment: 360 m (according to Tab. 1) minus 30 m (cable reduction when a repeater is
used)
Maximum possible cable length with repeater: 690 m.
Now it is possible to use the required cable length.
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Note!
The use of a further repeater is recommended as
ƒ Service interface
Advantage: Trouble-free connection during running bus operation is
possible.
ƒ Calibration interface
Advantage: Calibration/programming device remains isolated.