Lenze E82ZAFUC001 - Manual (Page 56)

6 Electrical installation
Bus cable length
EDK82ZAFUC−001 DE/EN/FR 4.0
56
l
H2 BusLeitgsLaenge−Leitungslaenge_3
Check repeater application
Given:
l Baud rate: 125 kbps
l Cable cross−section: 0.5 mm 2
l Number of nodes
connected: 28
l Cable length: 1500 m
Procedure Cable length See
1. Total cable length at 125 kbps: 630 m Tab. 1
2. Segment cable length for 28 nodes and a cable cross−section
of 0.5 mm 2 :
360 m Tab. 2
3. Comparison: The value under item 2 is smaller than the required cable length of 1500 m.
Conclusion
l It is not possible to use a cable length of 1500 m without applying a repeater.
l After 360 m (item 2.), a repeater must be installed.
Result
l The Lenze repeater, type 2176 (cable reduction: 30 m), is used
l Calculation of the max. cable length for the
– first segment: 360 m
– second and every further segment: 360 m (according to Tab. 1) minus 30 m (cable reduction if
a repeater is used)
à Maximum possible cable length with four repeaters: 1680 m.
à Thus it is possible to use the required cable length.
)
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.