How To Install; Cabling - Danfoss FC 300 Profibus Manual

FC 300 Profibus

How to Install

Cabling

Cable Lengths and Number of Codes
The maximum cable length allowable in one segment is dependent on the transmission speed. The total
cable length includes drop cables if any. A drop cable is the connection from the main bus cable to each
node if a T-connection is used instead of permissible cable length and maximum number of nodes/frequency
converters with 1, 2, 3 and 4 bus segments.
Drop cable connection (i.e. T-connection) beyond the cable lengths indicated is not recommended, due to
the increased risk of reflection occurring. Instead, Danfoss recommends direct connection of the FC 300.
Note that a repeater is a node in both of the two segments it connects. The number of frequency converters
is based on a single master system. If there are two or more masters (e.g. PC tools), the number of
frequency converters must be reduced correspondingly.
Maximum total bus cable length:
Transmission speed
9.6-187.5 kBaud
500 kBaud
1.5 Mbaud
3-12 MBaud
Total drop cable length limit per segment:
Transmission speed
9.6-93.75 kBaud
187.5 kBaud
500 kBaud
1.5 Mbaud
3-12 MBaud
1 segment: 2 segments:
32 nodes 64 nodes
(31 VLT) (1 repeater, 61 VLT)
[m]
1000
400
200
100
Max. drop cable length per
segment
[m]
96
75
30
10
None
MG.33.C2.02 - VLT is a registered Danfoss trademark
3 segments:
96 nodes
(2 repeaters, 91 VLT)
[m] [m]
2000 3000
800 1200
400 600
200 300
4 segments:
128 nodes
(3 repeaters, 121 VLT)
[m]
4000
1600
800
400
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