Installation
Electrical installation
26
Lenze · Decentralised frequency inverter 8400 motec (CANopen option) · EDS84DMOTCAN EN 4.0 - 02/2019
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Conclusion:
• It is not possible to use a cable length of 450 m without using a repeater.
• After 360 m (test step 2) a repeater has to be used.
Result:
• The Lenze repeater, type 2176 (cable reduction: 30 m), is used
•Calculation of the maximum cable length:
• First segment: 360 m
• Second segment: 360 m (according to the table Segment cable length
[5-2] ( 25)) minus
30 m (cable reduction when a repeater is used)
• Max. achievable cable length with a repeater: 690 m
• Now it is possible to use the required cable length.
Given
• Baud rate: 125 kbps
• Cable cross-section: 0.5 mm
2
• Number of nodes: 28
• Cable length: 450 m
Test step Cable length See
1 Total cable length at 125 kbps: 600 m Table Total cable length
[5-1] ( 24)
2 Segment cable length for 28 nodes and a
cable cross-section of 0.5 mm
2
:
360 m Table Segment cable length
[5-2]
( 25)
3 Comparison: The value determined in
step 2 is smaller than the required cable
length of 450 m.
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