Installation
Electrical installation
24
Lenze · Decentralised frequency inverter 8400 motec (CANopen option) · EDS84DMOTCAN EN 4.0 - 02/2019
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5.2.3 Specification of the bus cable
We recommend to use CAN cables in accordance with ISO 11898-2:
Observe the notes provided on the Bus cable length
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5.2.4 Bus cable length
Total cable length
1. Check that the total cable length is not exceeded.
The total cable length is defined by the baud rate.
[5-1] Total cable length
CAN cables according to ISO 11898-2
Cable type Twisted in pairs with shield
Impedance 120 Ω (95 ... 140 Ω)
Cable resistance/cross-section
Cable length ≤ 300 m
Cable length 301 ... 1000 m
≤ 70 mΩ/m / 0.25... 0.34 mm
2
(AWG22)
≤ 40 mΩ/m / 0.5 mm
2
(AWG20)
Signal propagation delay ≤ 5 ns/m
Note!
• It is absolutely necessary to comply with the permissible cable lengths.
• Observe the reduction of the total cable length due to the signal delay of the repeater.
Checking the use of repeaters
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• Mixed operation refers to different nodes being connected to the same network.
• If the total cable lengths of the nodes are different at the same baud rate, the smaller
value must be used to determine the maximum cable length.
Baud rate [kbps] Max. bus length [m]
20 4013
50 1575
125 600
250 275
500 113
800 38
1000 13
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