Lenze ETCxxxxx - Manual (Page 56)

Electrical installation
CAN installation instructions
Cable types for the CAN Bus
5
5.2
5.2.1
l
56 EDSTCXX EN 2.0
5.2.1 Cable types for the CAN Bus
Cable type suitable for the CAN bus:
ƒ LÜTZE, Type Superflex Bus

PUR 2x2x0.25 mm
@, up to 1 MBit/s
ƒ BELDEN, Type YR−29832, up to 1 MBit/s
Of course, cables of other manufacturers having similar characterstics can
also be used.
The two ends of the bus cables must be terminated with the surge
impedance of the cable. Up to 1 MHz this is usually 120 Ohm (0.25 W) for
twisted pair cables.
Various modules of the ETCHx series already feature this resistor. The
termination module ETCHT000 has been specifically designed for
terminating a CAN bus connection.
Alternatively, the termination can be made using a plug−in connector with
integrated terminating resistance (between the signals CAN high and CAN
low), which is plugged into the available CAN connection at the two furthest
modules.
5.2.2 Relationship between cable length and transfer rate
The maximum transfer rate depends on the delay periods on the sender and
receiver sides (incl. optocouplers), the accuracy of the oscillators and the bus
length (=cable length).
The following table provides an overview for networking Lenze CAN
subassemblies which cable lengths should not be exceeded for a specific
transfer rate. The figures apply to a twisted pair data cable terminated at
both ends and with a runtime of 10 ns/m:
Transfer rate Maximum cable length
1 MBit / s 15 m
500 kBit / s 50 m