Eaton easyControl EC4-200, User Manual

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10/10 MN05003003Z-EN
Network CAN/easyNet
93
Appendix
Network CAN/easyNet
Accessories
• RJ45 plug, Type: EASY-NT-RJ45 (8-pole)
Table 23: Prefabricated cables
• User-assembled cable, part no.: EASY-NT-CAB
(100 m 4
x
0.18 mm
2
)
• Crimping tool for RJ45 plug, Type: EASY-RJ45-TOOL.
• Bus terminating resistor, Type: EASY-NT-R
RJ45 plug with integrated bus terminating resistor 120
O
Cable length with cross-sections
For correct operation of the network the cable lengths, cross-
sections and cable resistances must match thoses listed in the
following table.
The impedance of the cables used must be 120
O
.
Calculating the cable length for a known cable resistance
If the resistance of the cable per unit of length is known (resistance
per unit length
R
’ in
O
/m), the entire cable resistance
R
L
must not
exceed the following values.
R
L
depends on the selected baud rate:
l
max
= maximum cable length in m
R
L
= Total cable resistance in
O
R
’ = Cable resistance per unit length in
O
/m
Calculating cross-section with known cable lengths
The minimum cross-section is determined for the known maximum
extent of the network.
l
= cable length in m
S
min
= minimum cable cross-section in mm
2
r
cu
= specific resistance of copper, if not stated otherwise,
0.018
O
mm
2
/m
Calculating length with known cable cross-section
The maximum cable length for a known cable cross-section is
calculated as follows:
l
max
= cable length in m
S
= cable cross-section in mm
2
r
cu
= specific resistance of cooper, if not stated otherwise,
0.018
O
mm
2
/m
h
Pre-assembled cables have RJ45 plugs at both ends.
Cable length Part no.
cm
30 EASY-NT-30
80 EASY-NT-80
150 EASY-NT-150
Cable length Cable
resistance Cross-section
m m
O
/m mm
2
AWG
up to 40
F
140 0.13 26
up to 175
F
70 0.25 to 0.34 23, 22
up to 250
F
60 0.34 to 0.5 22, 21, 20
up to 400
F
40 0.5 to 0.6 20, 19
up to 600
F
26 0.75 bis 0.8 18
up to 1000
F
16 1.5 16
h
Further information on the CAN cable lengths and
terminals can be obtained from the ISO standard 11898.
Baud rate Cable resistance R
L
Kbaud
O
10 to 125
F
30
250
F
25
500
F
12
l
max
=
R
L
R
’
S
min
=
l
x r
cu
12.4
h
If the calculation result does not correspond to a standard
cross section, take the next higher cross section.
l
max
=
S
x
12.4
r
cu